Blogs/News/PSAs

Standard discharge, reclaimed water reuse and zero effluent discharge

1. As for paper mill wastewater treatment, pulping wastewater is the most difficult wastewater to be treated in the papermaking industry. The organic pollutants and inorganic salts are high in content, complex in composition, high in hardness, high in costs. The technical staff of JIUWU work with experts from the Institute of Membrane Science and Technology of Nanjing Tech University and develop successfully membrane technology as the core of zero effluent discharge process or zld (zero liquid discharge).

2. Using the process of pretreatment, membrane integration, evaporation crystallization and other related processes turns waste into valuable and achieves the sewage recycle. The project forms a major technological breakthrough in the field of wastewater treatment of pulp and paper.

Application background

Industrial water prices continue to rise

Industrial water intake limit

Increased emission water quality standards (COD, TOC, etc)

Enforcement requirements for environmental protection and water reuse rate, etc.

Large demand for fresh water

Large amount of wastewater discharge

The composition of wastewater is complex, and the content of organic pollutants and inorganic salts is high.

Core advantage of process package

Independent research and development, Global First

Turn waste into treasure and realize 100% full reuse of wastewater

Multiple 10,000-ton demonstration projects

Reuse water, salt, and dry mud

The water quality of the produced water is good and meets the requirements for productive reuse.

zld (zero liquid discharge)

Case

Jiangsu Jiuwu Hitech Co., Ltd has done the largest zero liquid discharge project in paper pulp industry. The project is located in Japanese Oji Paper Co., Ltd. (OJI PAPER) in China, the scale of 40000m3/day of papermaking, pulp wastewater. Main processes include ozone-coupled biofilter (removing COD), the integrated membrane system of uf technology and reverse osmosis, electrodialysis (EDR) concentration system, MVR evaporation crystallization system. Through above-mentioned advanced processing system, the realization of wastewater recycling and zero liquid discharge. The clean water is supplied to the power plant desalination system and the production water system, waste salt is supplied to the Transportation Bureau to do snowmelt agent and chemical raw materials. The project which is the world's largest zero liquid discharge project in paper pulp industry has been stably operating for more than 3 years.

JIUWU HI-TECH has many unique membrane applications and more than 50 Patents regarding ceramic membrane solution, systems and process applications, in areas such as Food & Beverage, Bio-Pharm, Environmental and the Chemical Industry. We sincerely invite and welcome people from all around the world to invest and create more values together.

Overview

Heavy metal pollution refers to the environmental pollution caused by heavy metals or their compounds, which mainly caused by human factors such as mining, exhaust emissions, sewage irrigation and the use of heavy metal products. The heavy metal content of the environment caused by human activities increases and beyond the normal range leads to the deterioration of the environment quality.

MDet-5000X series heavy metal online water quality analyzer can detect the heavy metal content in the water quality online, measurement is accurate, reliable and safe.

Product Features Of MDet-5000X Colorimetric Analyzer

High reliability, low maintenance frequency

• Core components are imported, high reliability, long lifetime, suitable for a long time online monitoring
• Using photoelectric measurement method and special measuring algorithm
• All parts contact with liquid will be particularly tested to ensure a long service life
• Specially designed flow path to prevent blocking

Accurate measurement, wide application scope

• Photoelectric measurement method, accurate sampling, low sample injection error
• Automatic chromaticity and turbidity compensation algorithm, give full consideration to the situation of actual water samples, real and reliable monitoring results
• The unique hybrid technology of bubble agitation ensures thorough mixing of samples and reagents

Safe use, efficient analysis

• When a reagent leaks, instruments will automatically alarm and prompt the user for maintenance
• The equipment has a self-diagnosis function. If there is a defective, it will automatically alarm and display

Technical Parameter Of MDet-5000X Colorimetric Method Heavy Metal Online Analyzer

Function: The dynamic flow balance valve keeps the flow constant between 31-600KPa.
Role: Keep the flow through the valve constant.
Theory: When the incoming flow pressure P1 increases, the sleeve of the valve sleeve moves downward, compressing the spring inside the valve bladder, and reducing the flow area of the valve hole at the bottom of the valve bladder, that is, reducing the Kv value of the valve bladder. Thus, although the pressure difference ΔP across the damper is increased, the Kv value is reduced, and the product of the two, that is, the flow rate Q, remains substantially unchanged under the action of the spring.
The pipeline of the constant flow system is installed at the end without stepping.
The pump system is chilled water balancing pump and cooling water pump to prevent the pump from over-flowing when the number of units changes.
A place where a constant flow rate is required, such as a cooling tower.
Water supply pipes or return pipes can be installed.
Selection and precautions
Selection: Only according to the flow selection.
A. The valve pressure working range is greater than the minimum starting pressure difference.
B. It cannot be installed in series with the proportional integral electric control valve.
Constant flow system hydraulic balance scheme
Dynamic differential pressure balancing valve
Theory: The high pressure upstream of the electric regulating valve is guided to the lower side of the control bellows through the pressure guiding tube; the pressure downstream of the electric regulating valve is guided to the upper side of the control bellows through the external pressure guiding tube or the internal pressure guiding hole.
When the pressure on the high pressure side rises, the bellows moves upwards, causing the valve stem and the valve cone to move upward, causing the pressure on the medium pressure side to rise, thereby dynamically maintaining the pressure difference between the medium pressure side and the high pressure side and the spring. The preset force balance ensures the dynamic constant of the pressure difference across the electric control valve. When the pressure on the high pressure side is lowered, the bellows moves downward, and the situation is similar.
Adjust the differential pressure of the spring to adjust the differential pressure setting.
Function: Dynamically keep the pressure difference between the controlled points constant at the set value.
Function:
Ensure dynamic hydraulic balance of the controlled system to prevent dynamic imbalance in the system.
Prevents noise and vibration from being generated by the electric control valve regulating valve.
The regulating valve in the system can be selected with a driver with less driving force to avoid the danger of burning the valve.
Provides good valve authority for the regulating valve, ensures the realization of the linear heat-dissipating controlled system, and ensures the rapid and stable system.
The debugging workload is very small, the installation cycle is accelerated, and debugging can be avoided when the system is changed or expanded.
Conveniently correct the difference between actual and design conditions.
Maximum flow limit function.
Ensure dynamic hydraulic balance of the controlled system.
The dynamic differential pressure balancing valve dynamically maintains the pressure difference ΔP between the controlled points constant at the set value, and the Kv value of the other unoperated electric regulating valve does not change, so the water quantity of the branch is dynamically constant. The amount of water in the branch changes only when the electric regulating valve is actuated, that is, when the Kv value changes.
Prevent electric noise and vibration from the electric control valve.
The adjustment valve uses a driver with a smaller driving force.
The pressure difference between the two ends of the electric regulating valve is constant, and the pressure fluctuation of the system is absorbed by the dynamic differential pressure balancing valve. Therefore, the adjusting valve uses a driver with a smaller driving force.
Provides good valve authority for the regulator valve.
Definition of valve authority:
The pipeline of the fixed and variable flow system is installed at the end without step by step.
The pipeline, branch pipe or riser of the variable flow system is installed without stepping.
The valve of the single-pressure pipe must be installed back to the water, and the valve water supply or return pipe of the double-pressure pipe can be installed.
Selection: The valve body is selected according to the Kv value. The Kv value of the selected valve is greater than the design value. The valve pressure drop is used to calculate the valve Kv value, not the control pressure difference. Select the drive with a controlled differential pressure.
Dynamic differential pressure balance electric control valve
Theory: The essence is that a dynamic differential pressure balancing valve and an electric regulating valve are combined into one. The valve is a double valve cone structure, the upper valve cone is the valve cone of the electric regulating valve, and the lower valve cone is the valve of the dynamic differential pressure balancing valve. Cone, the dynamic differential pressure balancing valve provides a constant pressure difference (0.2Bar or 0.5Bar) before and after the electric valve cone (upper valve cone). The pressure fluctuation of the system is absorbed by the dynamic differential pressure balancing valve, when the electric valve cone ( When the upper valve cone is not actuated, the valve flow capacity kv is constant, and the pressure difference ΔP is constant, so the flow rate Q of the valve is constant; only when the electric valve cone (upper valve cone) acts, the flow through the valve will Changes have occurred, thus achieving a perfect unification of dynamic balance and adjustment functions.
Process: The upper and lower ends of the diaphragm form a balance with the force of the internal spring, ie P1 = P2+P spring.
When the system pressure fluctuates, when P1 increases, the balance is destroyed, and the force below the diaphragm is greater than the upper side, so the diaphragm will move upwards, close the small differential pressure control valve spool, so that P2 increases and reaches equilibrium again. Show.
On the contrary, the differential pressure control valve is opened so that the pressure difference of the regulating valve spool is always constant throughout the operation of the switch, so that the flow rate change through the valve is only one-to-one corresponding to the opening degree of the regulating valve.
The pipeline of the variable flow system is installed at the end without stepping.
The main advantage:
1. The occupied space is small, and the automatic balance of the system is good.
2. One leak point is missing for each group of valves.
3. Easy to install and maintain.
Disadvantages:
1. It is not as flexible as the split solution (dynamic differential pressure balance valve + electric control valve), and the differential pressure of the split solution can be adjusted on site.
Variable flow system hydraulic balance scheme
Solutions to common phenomena of hydraulic imbalance:
1. The system is uneven in temperature and heat. The running energy consumption of the pump is too high → hydraulic calculation, reasonable piping, the same program, static balancing valve. Dynamic differential pressure balancing valve or dynamic flow balancing valve, integral valve.
2. Variable flow system operation is out of regulation. The load is stable, but the room regulating valve moves frequently, causing the room temperature to fluctuate frequently. The system stabilization time is too long → dynamic differential pressure balance valve or integral valve.
3. The regulating valve produces noise and vibration. The regulating valve is not closed, and there is a danger of burning the valve in severe cases. The valve of the regulating valve is too small, the curve of the valve is deformed, and the linear heat-dissipating controlled system becomes a controlled system of the throwing heat. Dynamic differential pressure balancing valve or integral valve.

Zhengfeng is one of the most professional check valve manufacturers china . And we sincerely invite and welcome people from all around the world to invest and create more values together.

Are you looking for  water chemistry testing equipment  ?

Hangzhou Zetian Technology Co., Ltd. is the only domestic water testing instruments manufacturer with five analysis technical platforms which are LED colorimetric platform, full spectrum colorimetric platform, cold atomic absorption colorimetric platform, anodic dissolution platform and electrode method platform. These five kinds of analysis platform can measure the common pollution factors in water, including COD, ammonia nitrogen, total phosphorus, total nitrogen and heavy metals such as copper, chromium, lead, zinc, mercury, arsenic, etc. At the same time, using the full spectrum colorimetric platform or anodic dissolution platform also can realize COD/ ammonia nitrogen integrated system, total phosphorus/ total nitrogen integrated system, and all kinds of heavy metal integrated system, etc.

The device used to measure water quality of Hangzhou Zetian Technology Co., Ltd. has been experienced years of on-site validation, stable and reliable, low failure rate.

Peristaltic Pump Tube:

The United States imported special rubber hose, long service life, a tube can use more than one year.

Sample Module:

Homemade sampling module uses the high pure PTFE material, disassembly easy to clean or replace, reliable operation, every channel is completely isolated.

Control System:

(1)Control solenoid valve uses non-contact electronic switch, no mechanical life.

(2) Homemade control unit, after years of verification, low fault rate, high reliability, modular design, low maintenance cost.

Instrument Protection-Grounding Design:

Instruments have high-level intelligence, such as reagents fault adding warning (especially H2SO4 used in COD, if it is not H2SO4, it is likely to lead digestion tube burst), leakage protection (if there is leakage, the instrument will report errors), pressure relief valve (making pressure in digestion tube within a certain range).

All the external interface and main circuit of equipment is in isolation, which makes the normal sample without the outside interference. Especially for unequal potential connection, its effect is particularly evident.

In analog circuits (measurement module) also made electrical isolation, which makes the minimum possible interference on measurement.

Measuring Parts:

Modulating optical measurement makes no influence of external light on measurement, it is more stable.

External Interface:

Largest configuration has 2×4-20 mA output, 4×4-20 mA input, 2 switch input, 2 switch output, can access the PH meter, flow meter, ss and other equipment, and can display on the main interface.

Technology Platform:

It has five measuring platforms, suitable for the needs of different applications.

HANGZHOU ZETIAN TECHNOLOGY, established in 2008, is one of the most professional   water quality monitoring equipment suppliers  in China. Welcome you to visit us if you are looking for water quality testing supplies  . Currently, we are looking for certificated distributor and OEM clients throughout the world. R&D cooperation is also welcomed. If you have any interest, please contact us!

Membrane technology in the chemical industry is applied to brine filtration, natural rubber, polysolicon cutting fluid recovery and lithium recovery from salt lake brines. It can be used in bio-production clarification, edible liquid salt purification, nanofiltration system sulfate removal, primary brine purification and so on. The advantage is that it is environmentally friendly and cost saving. In natural rubber processing, the use of ceramic membrane filtration consumes less quantities of acid and produces less harmful pollutants to the environment. During the process of polysolicon cutting fluid recovery, you only need to spend low operating costs but will receive fast return on investment by using ceramic membrane equipment technology. Besides, the high-precision anti-pollution ultrafiltration membrane is used to purify the brine water, which can remove all solid suspended matter in the brine. With contact equipment, the process is simple and requires no human intervention in the operation. The application of ceramic membrane will help you save costs but gain more profits!

Brine Filtration

JIUWU is the first one to use ceramic membrane in the primary brine purification industry.

Natural Rubber

JIUWU offers a safer, cheaper and greener option to produce skim rubber products of high quality.

Polysilicon Cutting Fluid Recovery

Ceramic membrane can treat the waste liquid silicon produced in the solar energy production process.

Lithium Recovery From Salt Lake Brines

The membrane equipment for the lithium yield can reach 80% which is at the leading level.

JIANGSU JIUWU HI-TECH CO. LTD.,founded in 1997, focus on producing ceramic membrane filters for many years. And JIUWU HI-TECH has become a leading company in the membrane separation industry. We sincerely invite and welcome people from all around the world to invest and create more values together.

Cephalosporin

Cephalosporin is the second class of β-Lactamase found in nature following by penicillin. Any of various broad-spectrum antibiotics, closely related to the penicillins, which were originally derived from the fungus Cephalosporium acremonium. It has many advantages of high efficiency, broad-spectrum, low toxicity and enzyme-resistance which has been developed four new products to its range. It belongs to superior antibiotics that its application is growing widely. Advanced production technique is very pressing to meet brisk demands of the market both domestically and internationally. Cephalosporin C, or simply as CPC, is the source of original nuclear（7-amino cephalosporanic acid）of various cephalosporium antibiotic.

During the production of CPC, frame filter press, rotate vacuum drum filter are still used as a means of separation to remove protein, mycelium, and solid particulates. The technical means available on site did not achieve satisfactory degrees of separation. Meanwhile, those methods are unable to separate the massive existences of soluble protein, macro-molecule organic matters from the broth. The filtered broth shows not high transmittance with residual insolubility and soluble impurities which would increase the difficulty in the downstream extraction process and have a bad effect on the quality and yield of final product. According to market adjusting, some companies are asked to improve separation performance by means of membrane technology and to reduce the product losses. With the wide applications of ceramic membranes, they will play a significant role in separation and purification of antibiotics.

Three steps are introduced in order to guarantee the yield of CPC in the process of filtrate fermentation broth for the production of CPC by ceramic membranes. Pre-concentration step is made to let feed volume Vo concentrate to Vd and permeates are obtained meanwhile; diafiltration step is to add cleaning agents in the wanted liquids while filtration and effective ingredients are got to reach a high yield ; post-concentration step is to concentrate wanted liquids to Ve aiming to treat residuals conveniently and improve yield further.

Ceramic membrane filtration system could intercept protein and solid particulates from the untreated antibiotic fermentation broth. The protein –removing the capability of this technology is 10 times as much as that of the original process, with filtration yield increasing by 6％. The attenuation range of membrane flow rate is narrow and thus a better product quality can be obtained.

The temperature of CPC fermentation broth from the fermented process drops to 10 below zero and it is acidified to pH2.5-3.0 by the use of hydrofluoric acid.

Then CPC clarity is got due to removing mycelium, suspended solids, and macromolecular protein through the filtration process. In the next refining process, macroporous resin adsorption and ion-exchange are applied, and then nanofiltration and reverse osmosis are also used to obtain concentrated CPC.

JIANGSU JIUWU HI-TECH CO. LTD.,founded in 1997, focus on producing ceramic membrane purification for many years. And JIUWU HI-TECH has become a leading company in the membrane separation industry. We sincerely invite and welcome people from all around the world to invest and create more values together.

In the construction and bridge construction, ABT equipment shows itself and can provide tremendous help in various scenarios.

ABT provides large drilling equipment to help you build bridges and building foundations. Its function is to pass through the soft and highly compressive soil or water, transfer the load of pile to the harder, more compact or less compressive foundation bearing layer, reduce the deformation of the structure caused by long-term pressure, and improve the stability of the building.

In the construction of building foundation, the cement solidification is often affected by underground water gushing and rainfall. The concrete solidification can be guaranteed by drilling drainage holes and continuously pumping water by submersible pump.

In the manufacture of new building materials, ABT drilling equipment is using building soil and building stone. A variety of crushing equipment is used to produce the required gravel. The new environmental sand building is mainly used to make stone into uniform sand for building in some places where there is no sand, so as to reduce the damage to the environment.

ABT also provides mobile crushing equipment to help you recycle and crush construction waste, including metal material recycling, another part of concrete waste crushing into appropriate particles for secondary use, backfilling, reducing waste, reducing costs, protecting the environment, saving energy. And because the treatment is completed on the spot, the transportation cost is reduced, the waste treatment cost is reduced, and the most important thing is to reduce the damage to the environment caused by the demolition of buildings.

You can use: Crusher, air compressor, mine drilling rig, Hammer, drill bit

ABT Drilling Equipment Co., Ltd. mainly provides dth drilling equipment to help you solve the problem of drilling at high efficiency and low cost. By the way，we also provide home water well drilling equipment,RFQ today!

6 inch water valve is commonly used with flanged gate valves and various upper valves for water, including dirt separator.
Features of ZECO collector:
1. The release rate of primary gas of water through the exhaust valve assembly is 80%;
2. When the system runs for 4-6 hours, the gas content in the system can be reduced to less than half of the original level;
3. After a period of operation, the gas content in the system can be reduced to 0.4%;
4. Can separate the fouling at the same time during the exhaust;
5. After 50 cycles (flow rate of 0.5m/s), the dirt content decreased to less than 4%;
6. Suitable for systems with frozen liquid content up to 50%;
7. The minimum removal of air bubbles is 10 μm, while the minimum removal of impurity particles is 55μm.
8. The product complies with PED/DEP 97/23/EC(CE) standards;
9. The pressure loss is small and does not affect the flow rate.
6 inch Gate and butterfly valves are normally used in this dirt separator installation to ensure that water flow is blocked during maintenance to meet normal maintenance requirements. The dirt separator is applicable to heating, domestic hot water, geothermal utilization, central heating of thermal power plant, regional heating of boiler, ice storage air conditioning system ice storage and refrigeration and heat exchange & applicable to power industry, petrochemical industry, iron and steel metallurgy, paper, textile industry, food production, aerospace industry, shipping industry, automobile industry and civil heating (refrigeration) and other industries;It is used to protect equipment in the system that has low pressure or is sensitive to dirt because the heating device produces gas easily.

ZECO is one of the most professional control valve manufacturers china , and we have been devoted to produce control valve china for many years. If you want to know more details or want a quotation, just feel free to contact us!

Plastic Water Bottle Caps Push Pull Lid Caps Features:

Plastic water bottle push pull cap, as seen on many water bottles, and here seen in closed configuration. The unique three-dimensional modeling is very unique and adopts safe and non-toxic pp material, which has little damage to the environment and supports recycling and utilization.The inner layer has Screw Cap, which ensures that no leakage of liquid occurs. The outer layer can be lifted off the bottle Cap. Without turning the inner layer, the outer layer can be lifted to fetch water.Closure is the standard for most bottle.The company has passed the ISO9001 quality management system certification and adopted the advanced ERP management system, making the quality and delivery time of our products always at the leading level in the industry.What's more, we pet bottle caps manufacturers also have a variety of closure options to match with your bottles.

The GSM/CDMA all-weather wireless phones are providing a reliable and effective communications terminal when it is limited or no infrastructure can often be costly and time-consuming, they usually are fully contained in a composite waterproof housing with a handset or hands-free design, resulting in high reliability of the product long MTBF.

Additionally, these GSM telephones are fully programmable, remotely via SMS, designed to be shipped complete to site ready to operate, with the only requirement being the insertion of an appropriate network SIM card, perfect for many applications where an economical and reliable solution is required. 

Our GSM core module supports quad-band GSM / GPRS, its working frequency band is: GSM850MHz, GSM900MHz, DCS1800MHz and PCS1900MHz can be compatible with all countries of the mobile network. they embedded TCP, UDP, FTP, PPP and other protocols, according to the customer requirements custom background management system. 

PSST focused on the communication needs of the world's industrial markets.we produce water resistant cordless phone and weather resistant telephone.We welcome merchants from all over the world to cooperate with our factory for mutual benefit and win-win, and jointly create a better future. 

Micronized Water-Base Wax

Features: Easy dispersion, High gloss and hardness, Good scratch resistance and dirt resistance

Applications: Water-based inks and paints

Micronized Solvent-Base Wax

Features: Easy dispersion, Good abrasion resistance, Scratch resistance and smoothness

Applications: Flexo-printing ink, Offset ink, Gravure printing ink, Plastics coatings, Powder coating and Coil coatings

Our waxes have been exported to Japan, Europe, North America, Brazil, New Zealand, and 20 other countries and regions throughout the world.

The most effective fluid to stabilize the operating temperature in oil systems is water. Water/ Oil plate heat exchangers are used to cool down hydraulic oil or other fluids using water as a cooling medium. Internal cooling circuits as typically found in large production facilities and other cooling water sources supply water at temperatures that provide sufficient delta T compared to the oil input temperature.

Accessen oil to water heat exchanger series includes a range of models with high-efficiency. These shell and plate or shell and frame construction are also available.

A large amount of waste acid is produced in the production of titanium dioxide, a large amount of high-salt wastewater is generated in the post-treatment process, and some titanium dioxide is still lost after the CN filter. On the one hand, the titanium white industry suffers from increasingly strict Environmental constraints, on the other hand, waste acid, water, and titanium dioxide resources are huge. Therefore, titanium dioxide water treatment has received an increasing attention. JIUWU has developed a series of membrane treatment technologies for waste acid treatment, titanium dioxide recovery, and water reuse.

Technical introduction

The membrane process is based on membrane separation technology. The salt and acid in the waste acid, the salt, and water in the waste brine are separated to achieve the acid and salt in the waste acid, and the salt and water in the brine can be reused. The removal rate of the metal salt in waste acid is over 98%, the recovery of titanium dioxide is 99.99%, and the water production index reaches the international first-class standard. The separation membrane is a cross-flow filtration method, which greatly reduces membrane fouling, delays the rate of membrane fouling, and improves ceramic membrane filtration efficiency.

Process

Titanium dioxide production includes two production methods, sulfuric acid, and chlorination. For two different production methods, JIUWU has designed different membrane processes.

1. Titanium white waste acid treatment process for sulfuric acid method

2. Titanium dioxide second washing water treatment process for sulfuric acid method

3. Titanium white chloride slag water 'zero liquid discharge' for chlorination method

4. Titanium white post-treatment water reuse process for chlorination method

Process advantages

• Product water quality: The SS is less than 1ppm, the turbidity is less than 0.5NTU, and the effluent water quality is stable;
• Save land occupation: Membrane process replaces sedimentation tank, land occupation is much smaller;
• Long work life: Acid and alkali resistant, high temperature resistant and high-pressure resistant, work life is longer than 5 years;
• Easy operation: Short process, less control point, DCS control
• High effectiveness: Short separation process, continuous operation, short wash cycle
• Circular economy: Full recovery of titanium dioxide, product water recycle, chlorination method Titanium white process combined with caustic soda process form the environmental protection industry chain.

Function: The dynamic flow balance valve keeps the flow constant between 31-600KPa.

Role: Keep the flow through the valve constant.

Theory: When the incoming flow pressure P1 increases, the sleeve of the valve sleeve moves downward, compressing the spring inside the valve bladder, and reducing the flow area of the valve hole at the bottom of the valve bladder, that is, reducing the Kv value of the valve bladder. Thus, although the pressure difference ΔP across the damper is increased, the Kv value is reduced, and the product of the two, that is, the flow rate Q, remains substantially unchanged under the action of the spring.

The pipeline of the constant flow system is installed at the end without stepping.

The pump system is chilled water pump and cooling water pump to prevent the pump from over-flowing when the number of units changes.

A place where a constant flow rate is required, such as a cooling tower.

Water supply pipes or return pipes can be installed.

Selection and precautions

Selection: Only according to the flow selection.

1. The valve pressure working range is greater than the minimum starting pressure difference.
2. It cannot be installed in series with the proportional integral electric control valve.

Constant flow system hydraulic balance scheme

Dynamic differential pressure balancing valve

Theory: The high pressure upstream of the electric regulating valve is guided to the lower side of the control bellows through the pressure guiding tube; the pressure downstream of the electric regulating valve is guided to the upper side of the control bellows through the external pressure guiding tube or the internal pressure guiding hole.

When the pressure on the high pressure side rises, the bellows moves upwards, causing the valve stem and the valve cone to move upward, causing the pressure on the medium pressure side to rise, thereby dynamically maintaining the pressure difference between the medium pressure side and the high pressure side and the spring. The preset force balance ensures the dynamic constant of the pressure difference across the electric control valve. When the pressure on the high pressure side is lowered, the bellows moves downward, and the situation is similar.

Adjust the differential pressure of the spring to adjust the differential pressure setting.

Function: Dynamically keep the pressure difference between the controlled points constant at the set value.

Function:

Ensure dynamic chilled water balancing of the controlled system to prevent dynamic imbalance in the system.

Prevents noise and vibration from being generated by the electric control valve regulating valve.

The regulating valve in the system can be selected with a driver with less driving force to avoid the danger of burning the valve.

Provides good valve authority for the regulating valve, ensures the realization of the linear heat-dissipating controlled system, and ensures the rapid and stable system.

The debugging workload is very small, the installation cycle is accelerated, and debugging can be avoided when the system is changed or expanded.

Conveniently correct the difference between actual and design conditions.

Maximum flow limit function.

Ensure dynamic hydraulic balance of the controlled system.

The dynamic differential pressure balancing valve dynamically maintains the pressure difference ΔP between the controlled points constant at the set value, and the Kv value of the other unoperated electric regulating valve does not change, so the water quantity of the branch is dynamically constant. The amount of water in the branch changes only when the electric regulating valve is actuated, that is, when the Kv value changes.

Prevent electric noise and vibration from the electric control valve.

The adjustment valve uses a driver with a smaller driving force.

The pressure difference between the two ends of the electric regulating valve is constant, and the pressure fluctuation of the system is absorbed by the dynamic differential pressure balancing valve. Therefore, the adjusting valve uses a driver with a smaller driving force.

Provides good valve authority for the regulator valve.

Definition of valve authority:

The pipeline of the fixed and variable flow system is installed at the end without step by step.

The pipeline, branch pipe or riser of the variable flow system is installed without stepping.

The valve of the single-pressure pipe must be installed back to the water, and the valve water supply or return pipe of the double-pressure pipe can be installed.

Selection: The valve body is selected according to the Kv value. The Kv value of the selected valve is greater than the design value. The valve pressure drop is used to calculate the valve Kv value, not the control pressure difference. Select the drive with a controlled differential pressure.

Dynamic differential pressure balance electric control valve

Theory: The essence is that a dynamic differential pressure balancing valve and an electric regulating valve are combined into one. The valve is a double valve cone structure, the upper valve cone is the valve cone of the electric regulating valve, and the lower valve cone is the valve of the dynamic differential pressure balancing valve. Cone, the dynamic differential pressure balancing valve provides a constant pressure difference (0.2Bar or 0.5Bar) before and after the electric valve cone (upper valve cone). The pressure fluctuation of the system is absorbed by the dynamic differential pressure balancing valve, when the electric valve cone ( When the upper valve cone is not actuated, the valve flow capacity kv is constant, and the pressure difference ΔP is constant, so the flow rate Q of the valve is constant; only when the electric valve cone (upper valve cone) acts, the flow through the valve will Changes have occurred, thus achieving a perfect unification of dynamic balance and adjustment functions.

Process: The upper and lower ends of the diaphragm form a balance with the force of the internal spring, ie P1 = P2+P spring.

When the system pressure fluctuates, when P1 increases, the balance is destroyed, and the force below the diaphragm is greater than the upper side, so the diaphragm will move upwards, close the small differential pressure control valve spool, so that P2 increases and reaches equilibrium again. Show.

On the contrary, the differential pressure control valve is opened so that the pressure difference of the regulating valve spool is always constant throughout the operation of the switch, so that the flow rate change through the valve is only one-to-one corresponding to the opening degree of the regulating valve.

The pipeline of the variable flow system is installed at the end without stepping.

The main advantage:

1. The occupied space is small, and the automatic balance of the system is good.
2. One leak point is missing for each group of valves.
3. Easy to install and maintain.

Disadvantages:

1. It is not as flexible as the split solution (dynamic differential pressure balance valve + electric control valve), and the differential pressure of the split solution can be adjusted on site.

Variable flow system hydraulic balance scheme

Solutions to common phenomena of hydraulic imbalance:

1. The system is uneven in temperature and heat. The running energy consumption of the pump is too high → hydraulic calculation, reasonable piping, the same program, static balancing valve. Dynamic differential pressure balancing valve or dynamic flow balancing valve, integral valve.
2. Variable flow system operation is out of regulation. The load is stable, but the room regulating valve moves frequently, causing the room temperature to fluctuate frequently. The system stabilization time is too long → dynamic differential pressure balance valve or integral valve.
3. The regulating valve produces noise and vibration. The regulating valve is not closed, and there is a danger of burning the valve in severe cases. The valve of the regulating valve is too small, the curve of the valve is deformed, and the linear heat-dissipating controlled system becomes a controlled system of the throwing heat. Dynamic differential pressure balancing valve or integral valve.