Brake pneumatic valve performance comparison analysis

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.
brake pneumatic valve of the main performance advantages:
fluid resistance small, pneumatic valve, due to the pneumatic valve pneumatic brake valve is straight type, medium flow does not change direction, therefore more other pneumatic valve flow resistance is smaller.
, sealed performance is better by the pneumatic valve, opening and closing is as of pneumatic valve.
, wide applicable scope, except for steam and oil such as media, also applies to contain granular solid medium and high viscosity, also are suitable for making the object completely pneumatic valve and the low vacuum system of the valve.
, 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.

brake main performance of the pneumatic valve disadvantages:
, high design size, the closed a long time. 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 is easy to scratch, has an effect on the sealing performance and service life, and not easy to repair.
structure of several different brake performance comparison of pneumatic valve:
( Wedge single disc brake
a pneumatic valve, the structure is simple elastic pneumatic valve gate is
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, generally don't have to be surfacing welding and grinding seal face, this is the single disc and flexible disc does not have advantages.
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.
stem brake pneumatic valve and the difference between pneumatic non-rising stem gate valve:
pneumatic valve by pneumatic brake valve rod lifting transmission gate opening and closing of the up and down, rising stem gate of pneumatic valve drive screw thread on the top of the pneumatic valve stem stents, so by the position of the pneumatic valve stem determine the open-close position of the ram, and the transmission thread also facilitate daily lubrication maintenance, at the same time from the fluid corrosion, the disadvantage is that the requirement to the installation space is larger.
the pneumatic valve drive screw non-rising stem gate inside the pneumatic valve body, saved the space of the pneumatic valve rod bracket, so the whole pneumatic valve height decreases. To clear the open-close position, it can be installed above the pneumatic valve cover opening and closing scale, applicable to the sewer (under Such as underground pneumatic valve, pipe trench non-rising stem gate, in the narrow space or dust content in place.
brake pneumatic valve can also be based on different material, different pressure and different seal and connection mode, divided into different kinds of pneumatic valve gate.