Pneumatic valve gate the performance comparison of several different structure

brake pneumatic valve is in the pipeline has wide range of USES a kind of pneumatic valves, mainly through and block medium. Does not apply to regulate the flow of medium, but according to the pneumatic valve rod lifting height to determine the flow ( Such as fire scale with pneumatic seal gate valves equipped with opening and closing of the elastic base seat. Brake pneumatic valve, pneumatic valve compared with other requirements for pressure, temperature, diameter and so on the wider scope of application.
brake depending on the internal structure can be divided into pneumatic valve: wedge disc type, flexible disc type single, double disc type, parallel slide type.
according to the different and can be divided into pneumatic valve stem stents: rising stem gate pneumatic valve and pneumatic non-rising stem gate valves.
the main performance advantages of pneumatic valve, gate
. Pneumatic valve fluid resistance small, because the pneumatic valve pneumatic brake valve is straight type, medium flow does not change direction, therefore more other smaller pneumatic valve flow resistance;
　　. Sealing performance is better stop pneumatic valve, opening and closing is as pneumatic valve and effort;
　　. Applicable scope is wide, except for steam and oil such as media, also applies to contain granular solids and high viscosity medium, can also be applied to do object completely valve and low vacuum system of pneumatic valve to use;
。 Pneumatic valve is a double flow pneumatic brake valve, the flow direction of medium is not subject to restrictions, so is suitable for the medium may change the flow direction of pipeline, and ease of installation.
2, brake pneumatic valve main performance drawback
. High design appearance, size, closed time is long. Open when the need to upgrade the pneumatic valve plate to upper pneumatic valve cavity, closing and will need to pneumatic valve plate on all pneumatic seat, so pneumatic valve plate opening and closing large travel, time is long;
　　. Because the brake of the pneumatic valve pneumatic valve plate with two pneumatic seat sealing surface friction in the process of opening and closing, so the sealing surface easy to scratch, has an effect on the sealing performance and service life, and not easy to repair.

3, the structure of the several different brake performance of the pneumatic valve is
. Wedge single disc brake pneumatic valve
a, structure more flexible pneumatic valve gate is simple;
b, under high temperature, the sealing performance is better than elastic pneumatic gate valve or double ram pneumatic valve;
c, suitable for medium of high temperature anti-coking.
　　. Flexible disc brake pneumatic valve
a, it is special form of wedge type single ram pneumatic valve. Compared with pneumatic wedge gate valve, at high temperature, good seal performance, ram heated not easily stuck;
b, applicable to steam, high temperature oil and oil and gas medium, and is suitable for frequent switch parts;
c, does not apply to the medium of easy coking.
　　 . Double disc brake pneumatic valve
a, sealed performance is good pneumatic wedge gate valve, when sealing surface Angle and cooperate to be not very accurate pneumatic valve seat, still has good sealing performance;
b, ram after sealing surface wear, the spherical centers at the bottom of the metal pad can be used after the replacement, general need not surfacing welding and grinding seal face;
c, suitable for steam and hot oil and oil and gas medium, and is suitable for frequent switch parts;
d, does not apply to the medium of easy coking.
　　 . Parallel brake pneumatic valve
a, pneumatic valve sealing performance than other forms of gate to poor;
b, is suitable for low temperature and pressure medium;
c, ram and pneumatic valve seat sealing surface processing and maintenance easier than other forms of brake pneumatic valve.