Author:Site Editor Publish Time: 2019-06-04 Origin:Site
The double-cut discharge slab gate valve with diversion hole is mainly used to cut off the medium. It is a kind of industrial valves and is used in many industrial fields, such as natural gas and petroleum.
List of content for this article：
a, Double cut off slab gate valve features;
b, Double cut discharge valve seat working principle;
c, Double cut off slab gate valve with diversion hole.
Main features of the valve
1. With the structure of the industrial gate valve diversion hole, since the sealing surface of the valve seat always contacts the ram when the valve is switched, the medium can be effectively prevented from entering the valve seat and the sealing surface is scratched, thereby improving the service life of the sealing surface of the valve seat, and the valve can play a role in pigging.
2. With double sealing structure, the valve is mainly sealed by soft sealing seat. When the soft sealing seat is damaged, the metal sealing surface welded on the valve seat can achieve the second sealing.
3. Double cut-off discharge function, when the valve is closed, the inlet and outlet valve seat can simultaneously seal the pipe medium at both ends of the valve seat to achieve double cut off; when the pressure in the valve cavity is abnormally increased, the pressure difference acting on both sides of the valve seat will lift the seat, The ram is used to discharge the pressure in the middle chamber to the pipeline to achieve double bleed function.
Double cut discharge valve seat working principle
When the valve is closed, the initial sealing force of the sealing surface is provided by the spring on the valve seat. When the upper and lower pipes enter the medium pressure P, the pressure difference between the medium and the defined annular area pushes the valve seat closer to the gate. The seal realizes the double cut off function of the valve. When the pressure in the valve chamber is abnormally increased, the pressure difference between the two sides of the valve seat defined by the sum of the annular area overcomes the spring force to push the valve seat away from the gate plate, so that the pressure in the middle chamber is vented through the gap between the gate plate and the valve seat member. Put it into the pipeline to realize the double discharge function of the pressure in the middle chamber.
Summary of double cut off slab gate valve
Compared with the ordinary single slide slab gate valve, the double-discharge slab gate valve with the diversion hole not only has the friction of the valve seat sealing surface, the service life is long, the opening is labor-saving, and the valve at the inlet and outlet ends when the valve is closed. The seat can be sealed at the same time; when the pressure in the chamber is abnormally increased, the pressure in the middle chamber can be automatically discharged to the pipeline to make the valve more safe and reliable. In some cases, a double-discharge slab gate valve with a diversion hole can replace the ball valve, which further expands the application field of the slab gate valve.