Gate valve or ball valve for large diameter valve? What’s the difference between the two?

Gate valve or ball valve for large diameter valve? What’s the difference between the two?

In real life, there are many valve products, but the commonly used valve is ball valve and gate valve, but also the application of check valve. But for those who choose ball valves and gate valves, before buying, we will understand the use and efficacy of these and the difference between them, and how to choose good quality ball valves and gate valves, today let’s talk about large-caliber valves with gate valves or ball valves? What’s the difference between the two?

A large diameter valve gate valve or ball valve
Large caliber gate valve, small caliber ball valve.
Two, gate valve and ball valve between the difference is what
1, valve core structure difference
Ball valve for ball valve core, because the structure of its fixed ball valve under the condition of the high voltage, especially closed cases, valve ball stationary, its upper seat and dissolved under the shaft part comes from material work pressure, and valve ball is not to the middle and lower reaches of deviation, relative small middle and lower reaches of the seat to undertake work pressure.
So the valve in the position to get rid of the sliding friction is small, the seat damage is small, the valve life is long, especially for often the position of the valve, such a structure is more appropriate.
The core of the gate valve is a wedge disc or this parallel disc. There is no supporting shaft below it. Valve under high pressure to use, and in turn off the case, the valve plate largely derived from material work under pressure, and because of its valve plate structure plan, the work of all the material pressure effect on the valve plate together, valve plate will cling to pressure to the middle and lower reaches of the seat (at the same time the role of excessive burden on the valve plate are hanging on, Will make the valve plate whether wedge type or parallel processing double gate valve, there will be a certain deformation), the valve when opened to get rid of a great sliding friction, the damage of the valve seat print out the valve cycle is short.
2, seat structure difference
The valve seat internal structure has a torsion spring, and the sealing design of the seat position makes the residue in the material difficult to enter the seat position. And the valve seat under the effect of the spring sheet long-term contact with the valve ball, so in the valve position, the valve seat has a certain scraper effect, can adhere to the residue on the Angle valve after a long time of operation to scrape off, and thus can ensure the long-term sealing characteristics of the valve.
Especially used in super high pressure high temperature, because the seat, oil circuit board, the material of valve ball in when choosing options have the same linear expansion coefficient of the material, also have the seat of the structure of torsion spring and valves in turn off, great temperature difference and low temperature, does not damage the valve position, the valve will not cause the status of the wheel lock.
Gate valve seat is narrow, in high temperature use, when the valve is closed, because the material is not commodity circulation, so the temperature is reduced, so the seat will tighten, and then cause a very large clamping force on the valve plate.
When the valve is opened again, large torque must be used to get rid of this clamping force, which can cause very large damage to the seat, jeopardizing the service life of the seat. This affects the life of the valve. In addition, because of the weight of the gate valve itself when the valve is closed, the valve will produce a larger impact force and large noise.
3. Differences in travel arrangements
Ball valve stroke for angular stroke arrangement, so in the installation space is small, relatively low height. The travel arrangement of gate valve is straight travel, so the indoor space is large and the relative height is high.
4. The difference between actuators
Because of the fixed fixed ball design, its opening and closing torque value is small, so the actuator corresponding to the small. Because the valve plate clamping force on the seat, so to get rid of this kind of large sliding friction requires a huge torque, the actuator with large.
5. Difference of material inflow
Ball valve for double flow, no installation flow problem on the spot. Gate valves are generally single flow.
6, the difference between maintenance
Generally do not need maintenance, especially valve ball and seat, because of small damage, generally need not be removed within 5 years. Gate valve needs maintenance because of damage to seat.