Gas pressure regulating valve is a lever type of feedback control of the regulator. Gas cylinders in a liquid, the pressure is too high, leading to the need for decompression before burning stoves. Gas pressure regulator must be bad new one. A consequence, no air; 2 consequences, without reduced pressure. .
a pressure control valve works
can be said regulator valve substantially reducing valve, pressure reducing valve works as follows: a high pressure medium through a relatively large orifice charged to implemented in a reduced pressure chamber, it is actually reduced by the closure, membrane or both sides of the piston is the outlet chamber side, a pressure side is artificial, and controls the aperture size of the diaphragm and the valve stem (piston) is connected, so just give a fixed pressure, the outlet pressure will always equal the chamber pressure, this man given pressure may be provided by a gas source or a spring or a hydraulic pressure source.
2. Pressure regulator type
according to use and function of the main parameters, pressure, medium temperature, for special purposes (i.e., special, dedicated valve), the drive energy, configuration, etc. are classified, wherein the most common classification is based on the structure of the control valve is divided into nine categories, six kinds of linear travel, three kinds of angular travel. .
the pressure regulating valve 3 extending through
The use of the pressure reducing valve characteristic point: Compact type valve, medium flow valve, a conventional pressure relief valve, two pressure reducing valves , low pressure high flow valve.
Compact type valve: PR series compact valve, single-stage diaphragm vacuum structure, stainless steel diaphragm pressure transmission, output stability, is suitable for clean gas, and non-corrosive gases corrosive gases; Characteristics corrugated diaphragm to ensure accurate pressure regulator; metal – metal diaphragm seal; spring loaded pressure regulator; equipped with filters; selectable panel mounting.
Medium Flow relief valve: PM Series Medium Flow valves, single-stage diaphragm vacuum structure, stainless steel diaphragm pressure transmission, output stability, is mainly used in medium-flow gas system;
conventional high-pressure pressure valve: PH series of conventional high-pressure relief valve is mainly used for high input pressure systems, livePlug vacuum structure, stable performance, the maximum inlet pressure of 6000psig, the outlet pressure of 0 ~ 2500psig, suitable for pure gas, standard gas, etching gas; characteristics, safe and reliable pressure sensor design of the piston; equipped with filters; alternatively panel mounting.
two pressure reducing valve: PD series of two valves, two pressure diaphragm structure, stainless steel diaphragm pressure transmission, the output pressure stability for pure gas, and non-corrosive gases corrosive gases; characteristics, providing continuous precise outlet pressure; two-stage vacuum structure; corrugated metal diaphragm, the regulator for high accuracy and sensitivity; equipped with filters; can be panel mounted.
low pressure high flow reducing valve: PL series of low pressure high flow valves, single-stage diaphragm vacuum structure, stainless steel diaphragm pressure transmission, output stability, is mainly used in low pressure high flow gas system; characteristics, the large-diameter corrugated diaphragm increases the pressure sensitivity; metal – metal diaphragm seal; large flow rate, pressure drop is minimized; selectable panel mounting. Principle is to use the principle of the pressure regulating valve with pressure balanced spring force, when the compression spring is less than the pressure valve is closed, when the compressed air below the elastic force of the diaphragm rubber tubing to a pressure greater than the spring force of the diaphragm push the diaphragm upward curvature away from the seat the air flow of gas, this unloading piston is moved under gas pressure, the discharge from valve seat, and from the charge air compressor air into the gas through the discharge will atmospheric vent valve and the air compressor into idle.
4. The pressure regulator action
filter regulator is used to do? Decompression. Pneumatic positioner is provided by the force balance principleMeter work, its working principle is based on the force balance principle and design work. When introduced into the bellows pressure increase signal, the lever 2 rotates about the fulcrum, baffle near the nozzle, the nozzle back pressure by the amplifier, into the air chamber diaphragm actuator, the valve stem is moved downward, and the drive lever (pendulum) is rotated about the fulcrum, attached to the same feedback cam shaft (eccentric cam) is rotated counterclockwise in followed by the roller 1 about the lever fulcrum, and the feedback spring stretching of the tension spring lever 2 and signal pressure force acting on the bellows reaches a state of equilibrium torque balance meter. At this time, a certain signal with a certain pressure on the valve position, respectively. Positive mode of action of the above action, to change the mode of action, as long as the cam flip, A to B to become the like, can be.
The so-called positive acting positioner, the signal pressure is increased, the output pressure also increased; so-called counter-positioning, the signal pressure is increased, the output pressure is decreased. A direct acting actuator as long as the counter-positioning means, the reaction can be achieved the operation of the actuator; rather, as long as a reaction actuator installed on the counter-positioning can be achieved in the operation of a positive-acting actuators. Links (reference) generally control valve by electric actuators or pneumatic actuators composed of two parts with the valve body. Linear mainly through single pedestal and through engine type two, the latter having a large flow capacity, and small unbalanced run for stable operation characteristics, it is usually especially suitable for high flow, high pressure drop and low leakage applications. Rotary mainly: V-type electric control valve, electric valve, vent valve, butterfly valve and the like.