Blogs/News/PSAs

Description of 4 Inch Gate Valve:

ZECO 4 inch gate valve is one of the most commonly used calibers. Gate valve in the line just switch effect, looks small, really small gate to pipeline protection as very important, although the gate valve switch is a long time, but the gate valve torque needed to light, in the case of an emergency, if only one person online, if go to close a 4 inch ball valve, may take the human is very big, if the manufacturing process is a little omission cause excessive torque, also likely won't open, but the gate by hand wheel operation, turn the handwheel to drive the stem promoted, this itself is a process of from, open is very light.

Features of 4 Inch Gate Valve:

1. The stem of ZECO 4 inch gate valve adopts T-head which is integral, This is much stronger than threaded or welded stem and is less prone to high pressure bending;

2. The stuffing box of ZECO 4 inch flanged gate valve is deep enough to ensure sufficient packing to keep the stem sealed for a long time. Standard installed stuffing box design requirements meet < 100ppm unorganized emissions requirements, ZECO environmental protection has been ISO 14001 certification, to a sense of social responsibility of the enterprise obligations;

3. The handwheel design of ZECO 4 inch gate valve makes valve be easy to operate, in the manual operation process to use the power up.Turbine drives, electric and pneumatic devices are also available;

4. ZECO 4 inch gate valve has been sent to all parts of the world, and have been well received by users of oil companies and natural gas companies. ZECO has won the recognition of users around the world and long-term cooperation opportunities with its quality.

The radiator thermostatic balancing valve is a self-operated constant temperature flow control valve mounted on the radiator. It is composed of a thermostatic valve body and a temperature regulating device for air temperature sensing. The principle of action is that the opening of the thermostatic valve body is automatically controlled to change the amount of hot water passing through the radiator. When the room temperature is lower than the set temperature value, the radiator balancing valve automatically opens (or gradually increases) the radiator to heat the room until the room temperature reaches the set value. When the temperature of the room rises, the temperature sensor pack expands, causing the valve to gradually close (or close), and the heat sink will reduce the heating speed (or stop heating). Simply put, the main function is energy saving and comfort. However, many ordinary customers only use ordinary temperature control valves without a temperature pack, which cannot be automatically turned on or off. It is recommended that everyone adjust the indoor temperature and ensure that the indoor temperature is always at the set temperature by adjusting the hot water flow into the radiator. This thing is necessary for today's energy-efficient buildings. Designing houses and public buildings is a form of radiator heating. At this stage, it is necessary to use a three-way connection with a temperature control valve.

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

Description of 6 Inch Ball Valve:

ZECO Valve Group is a well-known ball valve manufacturer in China. Since its establishment in 1991, it has been producing ball valves for nearly 30 years. In the production process, ZECO regards each valve as a handicraft to keep improving. With the support of high-tech production equipment and high-tech personnel, each product can achieve international quality. ZECO has been a high-tech enterprise in China for many years. Every year, ZECO devotes itself to the research and development of valves with more efficient performance and longer service life. The research and development cost of ZECO accounts for nearly 8% of the company's sales cost.

Features of 6 Inch Ball Valve:

1. ZECO 6 inch valve is designed with an auxiliary seat emergency seal system.Once the soft seal seat is damaged, emergency sealing can be performed by injecting the appropriate sealant into the auxiliary seal system.Emergency seals can also be used to flush and lubricate seat areas as necessary to keep seat areas clean without affecting sealing.The stem also has an emergency seal design for emergency sealant filling and flushing lubrication;

2. ZECO 6 inch valve with fire protection construction.The fire protection structure of the 6 inch ball valve is designed in accordance with API 607. In the event of a fire, the metal seat will be immediately in contact with the ball after the soft seal seat burned, to prevent the valve leakage caused by greater impact;

3. ZECO 6 inch valve body wall thickness will have a certain amount of design, carbon steel body, seat, bottom cover are in accordance with ASTM B733 surface chemical coating. In addition, if the user needs special customization, ZECO also has a variety of anti-corrosion materials for selection to meet the working conditions;

4. ZECO 6 inch valve in order to prevent the maintenance of the valve stem because of the excessive pressure in the cavity and the phenomenon of flying out, there is a design to prevent flying out of the stem.

Description of 8 Inch Gate Valve:

The internal parts of ZECO 8 inch gate valve are made by the technology department to choose the most corrosion resistance and wear resistance of the material for production, to ensure that all kinds of corrosive medium in various pressure various temperature environment pipeline safety operation for a long time, of course, can also according to the actual needs of users and requirements for production, internal parts material ZECO can provide stainless steel internal parts, duplex stainless steel internal parts and low-temperature steel internal parts to meet the needs of different working conditions. For some special working conditions, ZECO can provide users with a complete set of pipeline valve solutions, so that users can leave the design of valve system to ZECO and deal with other pipeline problems by themselves.

Features of 8 Inch Gate Valve:

1. The handwheel of ZECO 8 inch gate valve is exposed for a long time, which may cause rust damage and need to be replaced. Considering this problem, ZECO designed the handwheel to be removable when the valve is fully open and ensured that the gate is in the open position. In addition, ZECO can also adopt painted handwheel to ensure anti-corrosion of handwheel;

2. ASTM A194 2H and ASTM A193B7 nuts and stud bolts for normal service conditions.ZECO provides ASTM A194 4 and ASTM A193B16 nuts and stud bolts or higher configurations if specified for use at high temperatures. ZECO stainless steel valves are furnished with standard bolts from ASTM A194 8 and ASTM A193 B8 nuts and studs;

3. The valve stem of ZECO 8 os&y gate valve is designed to prevent blow out of the valve stem, which is designed to prevent people from injury caused by flying out of the valve stem due to internal pressure problems when people need to replace packing or other parts with pressure in an emergency;

4. ZECO 8 inch gate valve can be produced to 150 ~1500 lb, safe and reliable.

Dynamic flow balancing valves are also known as self-operated flow control valves, self-operated balancing valves, constant flow valves, and automatic balancing valves. It automatically changes the drag coefficient according to changes in system operating conditions. Within a certain pressure difference range, the flow rate can be effectively controlled to maintain a constant value, that is, when the pressure difference between the front and the back of the valve is increased, the flow can be kept not increased by the automatic closing action of the valve. Conversely, when the pressure difference is reduced, the valve automatically opens and the flow remains constant. However, when the pressure difference is less than or greater than the normal working range of the valve, it cannot provide an additional pressure head after all, and the flow rate of the valve to the fully open or fully closed position is still lower or higher than the set flow rate.

Auto balancing valve , also known as dynamic flow balancing valve, flow control valve,dynamic balancing valve, constant flow dynamic balancing valve. The automatic flow balance valve controls the flow through the valve by automatically changing the overflow area of the spool and adapting to the pressure changes before and after the valve. Its flow rate can be set at the production plant, or it can be set on site or electronically adjusted as required.
The automatic flow balancing valve is actually a constant flow valve that keeps the flow constant. Its function is: when some terminal equipment such as fan coil unit, fresh air unit and other control valves in the system adjust with the change of air conditioning load, resulting in the change of pressure in the pipeline network, so that the flow of other terminal equipment remains unchanged, still consistent with the design value.
According to the different flow setting modes, automatic flow balancing valves can be divided into two categories: fixed flow type and field set flow type.
Advantages and characteristics
Dynamic flow balancing valve enables the valve bile to change according to the pressure difference of the water system from time to time, ensuring that it will not exceed the original set water flow and absorb excessive pressure difference, thus realizing the automatic balance of pressure and flow of the whole water system. Therefore, using it has the following benefits.
For owners and construction units:
(1) There is no need for system debugging: it can save you a lot of time and shorten the completion date;
(2) There is no need to install the same process management: it can increase the area and space used for you, save installation and material costs;
(3) Easy to use: the water system balance will not be affected by the phased completion of the project installation or the phased use of the equipment;
(4) Convenient change: When water systems in some areas need to be redesigned, the design and balance of water systems in other areas will not be affected.
(5) Reduce power consumption: As the whole water system is balanced, the refrigeration units (boilers, heat exchangers) and pumps are guaranteed to operate in the best working state, which has obvious energy-saving effect;
(6) Reduce wear and waste: to ensure that water flow will not exceed the original design, to ensure the durability of all equipment, to avoid excessive flow caused by copper pipe loss;
(7) Improving safety: Because the flow balance of water system is automatic, the possibility of destructive regulation is eliminated.
(8) For the designer, the workload is reduced: there is no need to calculate the resistance of the whole pipeline to accelerate the design speed;
(9) It is possible to use the different program system boldly: save pipes, corresponding materials and installation costs, and transfer the work of the balancing hydraulic system to the dynamic flow balancing valve to complete. Many other troubles caused by unbalanced water systems can be avoided.
Working principle
Highly controlled and efficient building environment requires system design engineers to endow novel design concepts in their design. Because of the increasing use of various kinds of fluid control systems, especially the combination of temperature control devices and regional control functions, the use of static balance valves is out of date.
The automatic balancing valve combines innovative design and provides a complete solution to the hydraulic balancing system with maximum flexibility. The original design of the automatic balancing valve is a balancing valve specially designed for refrigeration and heating systems. The use of automatic control valve gallbladder ensures that the flow rate is the designed flow rate and remains constant even in the case of pressure fluctuation.

ZECO is one of the most professional top 10 valve manufacturers in china, and we have been devoted to produce valve group for many years. If you want to know more details or want a quotation, just feel free to contact us!

A105 check valve Material:

ZECO Valve Group, founded in 1991 located in Shanghai, Yancheng, Wenzhou with focus on manufacturing wedge gate valve, through conduit gate valve, floating ball valve, trunnion mounted ball valve, top entry ball valve, globe valve, swing check valve, dual plate check valve and forged valve. Valve sizing 1/2" to 88", rating 150lb through 2500lb, served covering oil, gas, chemical, energy, refinery, LNG, LPG and many other fields. ZECO has excellent product quality managing system, certified by API 6D, CE/PED, ISO9001, ISO14001, ISO18001, WRAS, FM, TS and approved by oil & gas company. ZECO have long-term cooperation with China National Chemical Equipment Corporation (CNCE) and China Petroleum & Chemical Engineering Survey and Design Association(CPCESDA). As recognize the growing need, ZECO developed our own laboratory for research & development for product design innovation and vertification, which includes PT, MT, UT, FE test. ZECO is the humble and united team, to be more diligent and progressive to show the itegrity to our clients.

The differential pressure control valve working principle Balance valve is a dynamic and static balancing valve under hydraulic conditions. Such as static balance valve, dynamic balance valve.
Valve body material: cast iron, cast steel,
Work pressure is 0.6-4.0 MPA.
The working temperature is - 5 C - 350 C.
Valve caliber DN15-DN300,
Connection mode: flange, internal thread,

Manufacturing standard: national standard.

How does a balancing valve work?
Balancing valve is a special function valve. It has good flow characteristics. Besides, it has valve opening index, opening locking device and pressure measuring valve for flow measurement. By using special intelligent instrument, the flow value flowing through the balance valve can be directly displayed by inputting the valve type and opening value according to the measured pressure difference signal. As long as the balance valve with appropriate specifications is installed in each branch and user's entrance and debugged once with the special intelligent instrument, the flow rate of each user can reach the set value.
Static balancing valves are also called balancing valves, manual balancing valves, digital locking balancing valves, double-position regulating valves, etc. It is through changing the clearance between the spool and the seat (opening), to change the flow resistance through the valve in order to achieve the purpose of regulating flow. Its object of action is the resistance of the system, which can distribute the new water in proportion to the design calculation, increase and decrease the branches in proportion at the same time, still meet the flow demand of part of the load under the current climate needs, and play the role of heat balance. Dynamic balancing valves are divided into dynamic flow balancing valves, dynamic differential pressure balancing valves, self-operated differential pressure control valves and so on.
Dynamic flow balance valve is also called self-operated flow control valve, self-operated balance valve, constant flow valve, automatic balance valve, etc. It automatically changes the drag coefficient according to the change of system working condition (differential pressure). In a certain range of pressure difference, the flow through can be effectively controlled to maintain a constant value, that is, when the pressure difference before and after the valve increases, the flow through the valve can be maintained by the action of automatic closing small. On the contrary, when the pressure difference decreases, the valve opens automatically and the flow rate remains constant. However, when the pressure difference is smaller or larger than the normal working range of the valve, it can not provide additional pressure head after all. At this time, the flow rate of the valve to the full open or closed position is still lower or higher than the set flow rate can not be controlled.
Dynamic differential pressure balancing valve, also known as self-operated differential pressure control valve, differential pressure controller, constant voltage variable synchronizer, differential pressure balancing valve, etc. It uses differential pressure to adjust the opening of the valve, and uses the change of pressure drop of the valve core to compensate for the change of pipeline resistance, so as to keep the differential pressure basically unchanged when the working condition changes. The valve working principle is that in a certain flow range, it can effectively control the constant pressure difference of the controlled system, that is, when the pressure difference of the system increases, it can ensure that the pressure difference of the controlled system increases by automatically closing the valve. When the pressure difference decreases, the valve opens automatically, and the pressure difference remains constant. The self-operated pressure difference control valve has an automatic plug closing state within the control range. The pressure difference between the two ends of the valve exceeds the preset value. The plug opens automatically and adjusts the opening automatically under the action of the pressure sensitive film to keep the pressure difference between the two ends of the valve relatively constant.

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!

Description of 6 Inch Gate Valve:

All casting and forged parts of ZECO 6 inch gate valve, especially the body and cover two of the main pressure components, are used to strengthen the intensity of the heavy sections, although ZECO body, cover thickness is up to standard, but the heavy sections of the design can make the product more guaranteed, allowance in corrosive medium to ensure long service life of the product.ZECO pays great attention to the purchase and inspection of raw materials, because ZECO knows very well that if raw materials are not strictly controlled, no matter how good the processing technology and detection means are in the later stage, they cannot turn unqualified products from the source into excellent products. Therefore, ZECO slowly moves valve products towards the route of handicraft products step by step.

Features of 6 Inch Gate Valve:

1. ZECO 6 inch gate valve has very reliable maintenance performance. The replaceable valve seat design ensures that later seat damage can be replaced on site. The inverted seal design ensures online replacement when packing is replaced;

2. When ZECO 6 inch flanged gate valve is transported, stainless steel valve and carbon steel valve will be separately packaged, because at room temperature, when carbon steel valve and stainless steel valve contact, will not immediately carburizing phenomenon, stainless steel valve has spots of corrosion is a certain period will appear.In the humid environment, if the carbon valve and stainless steel valve stacked together is easy to produce chemical reactions, thus damaging the protective layer of stainless steel valve, resulting in stainless steel valve rust;

3. After nearly 30 years of gate valve design, ZECO 6 inch gate valve products have stable performance and light switching torque;

4. ZECO 6 inch gate valve is all its own precision casting molds, and the casting sand is fine sand, beautiful appearance and clear casting characters.

As we all know, quality is the life of an enterprise. ZECO and every employee of ZECO attach great importance to quality requirements because of its corporate culture. We have developed an excellent quality process flow, which can guarantee excellent qualified rate from the material analysis, physical performance test, aging treatment before processing, dimension test after processing, the thickness after spraying treatment, adhesion test after assembly, performance test and the final inspection after delivery. Each quality control valve has its unique code and can be traced back to the source of any spare parts of each valve and to the person who processes them. We have a lot of quality control certificates and every year we produce all kinds of valves that are tested by the national inspection center. Now, we are one of the best water control valves manufactures in China. In line with the policy of winning customer satisfaction with quality, we try our best to join the world's best quality and best performance water valve brands. Looking forward to the customer's witness.

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

Globe Valve A105 Material:

Description of 3 Inch Butterfly Valve:

ZECO 3 inch butterfly valve is a small diameter butterfly valve, usually manually operated, and the connection is usually lug type or wafer type, because the advantage of small diameter butterfly valve is that it is simple in accordance with the way, compared with other valve flange connection operation is fast and simple. ZECO as a professional on the wafer and lug type butterfly valve manufacturer, is strict to the material and appearance of the casting, casting usually arrive ZECO factory, will be isolated in the corresponding area waiting for QC inspector inspection, inspector will, in turn, the chemical composition, physical properties of the casting and design is individually and will follow the ERP system into the data of the product review file for later use. ZECO also pays great attention to every detail in the production process, and each process will be tested and recorded by corresponding inspectors in the ERP system.

Features of 3 Inch Butterfly Valve:

1. ZECO 3 inch butterfly valve can use metal seal structure and resilient seal structure, connection mode can also choose lug type, wafer type and flange connection, the choice of diversity, users can choose according to the actual working conditions to meet the requirements of working conditions;

2. ZECO 3 inch butterfly valve has low torque. Although it is small in size, ZECO engineers make every effort to design the product so that users can feel ZECO's improvement in design, rather than rush through it;

3. The stem of ZECO 3 inch butterfly valve is designed with anti blow-out structure, which can ensure the maintenance personnel to avoid personal safety damage caused by the pressure of the middle chamber pushing out the stem when replacing the packing;

4. The seat and sealing ring of ZECO butterfly valve can be replaced, which ensures the quick and convenient maintenance of maintenance personnel on site.

Description of 6 Inch Butterfly Valve:

ZECO provides detailed installation instructions to ensure high performance and long service life of the 6 inch butterfly valve. The capacity if piping flanges and valve depends the deformation of gaskets. Acting force of bolting is not only resists force to loosen the connection, but also to keep necessary compressing stress. Taking note of the force does not exceed the gasket load and pressure load. In order to ensure good connection, following instructions shall be noted.

(a) Check flange surface, if any defect appears leakage, groove or impress, repair before installation;

(b) The installation requests of Cast iron flange are more than the ductile cast iron. Proposed to use low-strength steel Bolted to reduce as a result of excessive pre-compression flange of the possibility of exceeding the prescribed stress. To fit flat flange gasket in the flat flange to prevent excessive torque of bolt flange damage. Should not be confused with convex planar flange of the loaded flange In the cast iron flange connection is particularly important that the top is installed on the better to ensure that in the absence of excessive load bolted gasket circumstances make an appropriate compaction force;

(c) Gasket have the capacity of resisting deformation and damage;

(d) Check the centration of assemble-part flanges, Lubricate the threads of boltings. Boltings shall be fasten sequential to make sure level contact between flange and gasket.

Features of 6 Inch Butterfly Valve:

1. One of the advantage of ZECO 6 inch butterfly valve is fast closure;

2. One of the advantage of ZECO 6 inch butterfly valve is disc sealing material is high grade rubber or Teflon, which successfully resist aging and abrasion;

3. One of the advantage of ZECO 6 inch butterfly valve is the bracket connected with the drive device conforms to ISO5211 standard;

4. One of the advantage of ZECO 6 inch butterfly valve is the stem is designed to meet API 609 requirements with a blowout resistant design.

The difference between the two balancing valves is that the thermostatic balancing valve

manually adjusts the opening degree of the thermostat valve, while the auto balancing valve automatically adjusts the opening degree of the thermostat valve by using temperature sensors.

Thermostatic balancing valve (referred to as constant temperature valve) is an energy-saving product. The principle is to control the temperature of the valve by using the temperature sensor in the temperature control valve head. When the room temperature rises, the temperature sensor expands due to thermal expansion and compresses the stem to make the valve close small. When the room temperature drops, the temperature sensor shrinks due to cooling, and the stem springs back to open the valve. Therefore, when the room has other auxiliary heat sources (sunlight, other heaters) and the room temperature is higher than the set temperature, the valve automatically closes down, the water intake of the radiator decreases, ultimately saving the heat of heating.

The setting temperature of the auto balancing valve can be adjusted artificially. The constant temperature valve will automatically control and adjust the water quantity of the radiator according to the set requirements, so as to achieve the purpose of controlling the indoor temperature. Temperature control in user's room is realized by constant temperature control valve of radiator. The constant temperature control valve of radiator is composed of a constant temperature controller, a flow regulating valve and a pair of connectors. The core component of the constant temperature controller is the sensor unit, namely the temperature package. The temperature chamber can induce the volume change caused by the change of ambient temperature, drive the valve core to produce displacement, and then adjust the water quantity of the radiator to change the heat dissipation of the radiator.

Basic information

This sustaining valve is opened to prevent the pipeline and equipment from being damaged due to overpressure when the pressure in the water supply pipeline exceeds the set pressure of pressure relief. The valve closes automatically when pressure drops to the set value. 

Features

1. Accurate Pressure Control

2. Fast Opening to Maintain Line Pressure

3. Slow Closing to Prevents Surges

4. Completely Automatic Operation

Principle

Inlet pressure water enters the lower cavity of the pilot valve diaphragm from the guide valve when the pressure in the pipeline exceeds the set pressure of the guide valve to make its pressure increase to open the guide valve, the main valve control room outwards drain under the effect of the inlet pressure water to open the main valve, it starts to discharge pressure. When the pressure in the pipeline drops to the set pressure, the pressure in the lower cavity of the guide valve diaphragm decreases, causing the guide valve closed. This results in increased water pressure from the guide pipe to the pilot valve, then to the main valve control room. The main valve plate closes and begins to hold pressure. 

Installation and Commissioning

The pressure relief(sustaining) valve supports horizontal and vertical installation but should pay attention to the inlet and outlet direction of valve body water when installing. In general, one fire water supply system can only install one pressure relief valve . Within the operating pressure range of the spring specified in the nameplate, the opening pressure can be adjusted by rotating the adjusting screw to change the spring compression amount. For specific use, please consult ZhengFeng Valve Group.

Double regulating valve working principle

Balance valve is a dynamic and static balancing valve under hydraulic conditions. Such as static balance valve, dynamic balance valve.

Valve body material: cast iron, cast steel,

Work pressure is 0.6-4.0 MPA.

The working temperature is - 5 C - 350 C.

Valve caliber DN15-DN300,

Connection mode: flange, internal thread,

Driving mode: manual and electric.

Manufacturing standard: national standard.

Balancing valve is a special function valve. It has good flow characteristics. Besides, it has valve opening index, opening locking device and pressure measuring valve for flow measurement. By using special intelligent instrument, the flow value flowing through the balance valve can be directly displayed by inputting the valve type and opening value according to the measured pressure difference signal. As long as the balance valve with appropriate specifications is installed in each branch and user's entrance and debugged once with the special intelligent instrument, the flow rate of each user can reach the set value.

Static balancing valves are also called balancing valves, manual balancing valves, digital locking balancing valves, double-position regulating valves, etc. It is through changing the clearance between the spool and the seat (opening), to change the flow resistance through the valve in order to achieve the purpose of regulating flow. Its object of action is the resistance of the system, which can distribute the new water in proportion to the design calculation, increase and decrease the branches in proportion at the same time, still meet the flow demand of part of the load under the current climate needs, and play the role of heat balance. Dynamic balancing valves are divided into dynamic flow balancing valves, dynamic differential pressure balancing valves, self-operated differential pressure control valves and so on.

Dynamic flow balance valve is also called self-operated flow control valve, self-operated balance valve, constant flow valve, automatic balance valve, etc. It automatically changes the drag coefficient according to the change of system working condition (differential pressure). In a certain range of pressure difference, the flow through can be effectively controlled to maintain a constant value, that is, when the pressure difference before and after the valve increases, the flow through the valve can be maintained by the action of automatic closing small. On the contrary, when the pressure difference decreases, the valve opens automatically and the flow rate remains constant. However, when the pressure difference is smaller or larger than the normal working range of the valve, it can not provide additional pressure head after all. At this time, the flow rate of the valve to the full open or closed position is still lower or higher than the set flow rate can not be controlled.

Dynamic differential pressure balancing valve, also known as self-operated differential pressure control valve, differential pressure controller, constant voltage variable synchronizer, differential pressure balancing valve, etc. It uses differential pressure to adjust the opening of the valve, and uses the change of pressure drop of the valve core to compensate for the change of pipeline resistance, so as to keep the differential pressure basically unchanged when the working condition changes. Its principle is that in a certain flow range, it can effectively control the constant pressure difference of the controlled system, that is, when the pressure difference of the system increases, it can ensure that the pressure difference of the controlled system increases by automatically closing the valve. When the pressure difference decreases, the valve opens automatically, and the pressure difference remains constant. The self-operated pressure difference control valve has an automatic plug closing state within the control range. The pressure difference between the two ends of the valve exceeds the preset value. The plug opens automatically and adjusts the opening automatically under the action of the pressure sensitive film to keep the pressure difference between the two ends of the valve relatively constant.

The double plate china wafer check valve is used for the pure pipeline, industry, environmental protection, water treatment, high-rise building water supply, and drainage pipeline to prevent reverse flow of the medium. The disc check valve adopts wafer type, butterfly disc is two semicircular and adopts spring forced to reset. The sealing surface can be used as body welding wear resistant material or rubber lining.

Its disc adopts dual type, can close quickly by itself under the action of spring force, and because of the action of fast closing, can effectively prevent the backflow of the medium, sealing performance is good. The disc type check valve is a universal single flow valve that can be easily installed between two flanges. For disc check valves, we have ductile iron and stainless steel for various operating conditions. 

Stainless steel castings and copper casting, we hold the material source, starting from the analysis before casting furnace, to examine again, finally to the processing and testing, every step of the process is to ensure that the product after consistent with our commitment to customers, and according to the stainless steel material, we can customize as material 316 and 316 l material or demand a higher material products. We believe that our products with a craftsman's spirit and quality will convince customers that Chinese brands are becoming better and better, instead of low-end products long ago.

To withstand high temperature, the metal seal must be used, but large leakage; For zero leakage, rubber seal must be used, but not high-temperature resistant. In order to overcome the contradiction of the double eccentric butterfly valve china, the triple offset butterfly valve was carried out.

The structural characteristics of the double eccentric eccentric axis of the stem position at the same time, make the butterfly plate type sealing face of the cone axis deflection in the cylindrical axis of ontology, that is to say, after the triple eccentric, butterfly plate sealing section is no longer true circle, but the ellipse, and so the seal face shape asymmetry, tilt to the center line of the ontology, on the other side is parallel to the centerline of ontology. The biggest characteristic of the triple eccentric is fundamentally changed the seal structure and seal position is no longer, but the torque seal, namely not rely on the elastic deformation of the seat, but completely rely on the seat of the contact pressure to achieve sealing effect, thus solved the problem of metal seated zero leakage at a stroke, and because of the contact pressure and the medium is proportional to the pressure, resistance to high pressure high temperature is solved. Are abundant as producers of triple offset butterfly valve, our valves service life is long, the key is the beginning of the material and material technology progress, many new high-performance materials developed in recent years, also appeared many casting, welding, spray welding, painting, such as molding, sintering, composite and surface treatment of new technology and new technology and equipment. Paying attention to the information about material science and applying it to the valve in time is an important technical way to develop high performance and high parameter valve.

Basic Information

This non slam check valve prevents backflow of media and reduces water hammer to achieve the safe and quiet effect.

Features

1. Small fluid resistance, large flow;
​
2. Automatic control using medium energy;

3. Prevent water hammer phenomenon;

4. Slowly-closing silencing.

Principle

When the pipe supplies water from the inlet end of the valve, the water from the needle valve and one-way valve enters the valve cover control room and then is discharged downstream through the ball valve. Due to the small opening of the needle valve, the discharge speed of the control room is greater than that of the inlet to replenish water, thus reducing the pressure in the control room. The inlet pressure acting under the main valve disc all the time lifts the main valve disc, thereby opening the main valve disc and supplying water downstream. When the pipeline stops supplying water, the downstream water begins to flow back. Due to the effect of the one-way valve, the backflow water cannot flow out after entering the valve cover control room through the ball valve. As a result, the pressure of the valve cover control room increases gradually and the main valve disc is closed tightly.

Installation and Commissioning

Needle valve and ball valve adjust together to get the best opening or closing speed. For specific use, please consult ZhengFeng Valve Group.
​

Product scope , Standards & Materials

Size Range: 2"~24"
Pressure Rating: 10bar ~ 25bar
Face to Face Dimensions: AMSE B16.10, EN558-1
Flange End Dimension: AMSE B16.1/16.42, AS4087, EN1092-2
Coating: Fusion Bonded Epoxy Coating
Inspection and Test: ISO 5208 / EN 12226-2

Basic information

This valve is used as a two-way closed circuit device.

Features

1. No need for sluice Wells, which reduces the amount of installation work;

2. Does not affect the traffic, and underground parts of the integration, effectively prevent theft;

3. Stem has a special extendable structure, which can effectively prevent the ground from sinking;

4. Long life, no internal leakage.

Principle

This underground gate valve uses the form of pin coupling to transfer the sensor force existing in the gearbox and transmission shaft buried in the ground. The telescopic drive rod is extended until it is installed in the underground bonnet. This layout and approach ensure that work is done properly and efficiently.

Installation and Commissioning

Connect the valve with the water supply pipe, extend the expansion drive rod to the set height, tighten the expansion limit device to maintain the extension height, backfill the pipe groove, tamp and make cement pier foundation, put the valve box plate on the cement foundation, place the valve box cover, lay the road surface and make the valve box cover equal to the road surface. For specific use, please consult ZhengFeng Valve Group.