Difference Between Ball Valve and Gate Valve as follow：
The valve core of gate valve and ball vave
The valve core of the ball valve is a ball. Because of its fixed ball structure, the valve is fixed under the condition of high pressure, especially when it is closed. The upper stem and the lower support shaft decompose part of the pressure from the medium, so the ball does not shift to the downstream, so the pressure on the downstream valve seat is relatively small, so the friction force that the valve overcomes when it acts is small, so the valve seat is ground. Small damage, the long service life of the valve, especially for frequently operated valves, this structure is more suitable.
The core of the gate valve is a wedge valve plate or parallel valve plate. There is no supporting shaft at its lower part. Therefore, when the valve is in the high-pressure application and in the closed state, the valve plate bears a great pressure from the medium. Because of the flat gate valve plate structure, all the medium pressure acts on the valve plate at the same time, the valve plate will be dead pressed to the downstream valve seat (at the same time, the excessive pressure acts on the vertical surface of the valve plate, making the valve plate whether wedge-shaped or parallel double ram. There will be some deformation), so the valve needs to overcome great friction when it is opened, so the life of the valve printed by the wear of the valve seat is short.
Valve seat
There is a spring in the valve seat of the ball valve, and the sealing design of the valve seat makes it difficult for the dregs in the medium to enter the valve seat. The valve seat contacts with the valve ball for a long time under the action of spring, so when the valve acts, the valve seat has a certain scraper function, which can scrape off the residue attached to the valve core after long-term operation, so the sealing performance of the valve can be guaranteed for a long time. Especially in the application of high temperature and high pressure, because the materials of valve seat, valve body and valve ball are selected with the same thermal expansion coefficient and the valve seat with spring structure, when the valve is closed, the huge temperature difference and temperature drop will not affect the action of the valve, and the valve will not be locked. The valve seat is very narrow. In high-temperature application, when the valve is closed because the medium is not circulating, the temperature will drop, so the valve seat will be tightened, which will produce a great pressing force on the valve plate. When the valve is opened again, a large torque is needed to overcome this pressing force, which will cause great damage to the valve seat and affect the service life of the valve seat. Thus, the service life of the valve is affected. In addition, due to the self-weight of the gate itself when the valve is closed, it will bring great impact force and noise to the valve.
Itinerary
The stroke of the ball valve is angle stroke, so the installation space is small and the height is low.
The stroke of the gate valve is a straight stroke, so the installation space is large and the height is high.
Actuator
Due to the design of the fixed ball, the torque value of its opening and closing is small, so the corresponding actuator is small. Because the valve plate has a large pressing force on the valve seat, it needs a large torque to overcome this large friction, and the actuator is equipped with a large amount of torque.
Medium flow direction
Double flow direction, no installation flow direction problem on site.
Generally, it is a single flow direction.
Service life
The ball valve has a longer service life, while the gate valve's service life is relatively short.
Maintenance
The ball valve generally does not need maintenance, especially the ball and valve seat. Due to the small wear, it does not need to be replaced within 5 years.
The gate valve needs regular maintenance due to the large wear of the valve seat
As a industrial Valve company, ZECO always adhere to exceed customer expectations, to provide customers with more value-added
services and products as the ultimate goal.
ZECO was established in year 1991. We are located in Shanghai, Yancheng and Wenzhou with total building area 102000㎡. Till now, we have expanded into a group with 8 holding companies(including 5 production bases), sales offices and sales agents. Mainly manufacturing forged ball valve, casting china ball valve, wedge gate valve, through conduit gate valve, globe valve, dual plate check valve, swing check valve & forged steel valve.
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