Pneumatic regulating valve working principle pneumatic regulating valve air source pressure

Pneumatic control valve according to its stroke can be divided into straight stroke and Angle stroke two, according to its structure type points straight single seat valve, straight two-seat valve, high pressure valve, Angle valve, sleeve valve, diaphragm valve, butterfly valve, eccentric rotary valve. The straight through valve is more common, single-seat valve leakage is small, but the pressure difference before and after the valve can not be too large, and the two-seat valve is just the opposite.
Pneumatic control valve also has the function of fault reset, in the purchase can be based on the need to choose the gas open type or gas closed type. When the gas source fails, the valve can be automatically restored to a fully open or fully closed state according to pipeline safety requirements. This is the general electric valve can not do. In terms of price, pneumatic control valves are cheaper than similar electric valves.

Changchun electric butterfly valve sales of pneumatic control valve is the key to the advantage of pneumatic control valve power switch action speed can be adjusted, simple structure, easy maintenance, posture of the whole process because of its own steam cache characteristics, not easy to be destroyed by jam, in some provisions of explosion-proof type of the place with more reliable than electric valve. Due to the composition of pneumatic control valve without electrical components, so in the transportation of flammable and explosive materials at that time even if common faults are not easy to cause fire due to electrical components, to load lead to safety risks.
Stroke switch (echo) Stroke switch a device that reflects the two extreme positions of the valve switch and simultaneously sends an indicating signal, according to which the control room can reverse the status of the valve switch for appropriate action. Pneumatic control valve; Control element; Debugging; Pneumatic control valve is the use of compressed air as a power source, can be remote and accurate control of the valve opening of a class of valves. Pneumatic control valve is easy to maintain, open and close quickly, in the accident loss of power source can be placed in the valve failure safety position, and more suitable for explosion-proof places, so widely used in petrochemical, thermal power, nuclear power and other fields.
The flow characteristics of the regulating valve is the relationship between the relative flow of the medium flowing through the regulating valve and its opening under the condition of constant pressure difference at both ends of the valve. The regulating valve is used to regulate the flow, pressure and liquid level of the medium. According to the adjustment part signal, automatic control valve opening, so as to achieve medium flow, pressure and liquid level adjustment. Control valve electric control valve, pneumatic control valve and hydraulic control valve. This manual mainly introduces two kinds of electric control valve and pneumatic control valve.
Under the progress of science and technology level in our country, our country chemical industry production automation also got rapid promotion, can realize the accurate control of flow, pressure, liquid level and temperature, in the chemical industry automatic control system, control valve belongs to an important actuator, its type and installation quality quality has important influence on regulating loop regulation, If the selection and application of the regulator valve is not appropriate, it will seriously threaten the service life of the regulator valve, and even lead to a system shutdown accident when the situation is serious. The following is an in-depth analysis of the selection and application of pneumatic control valve in the process of chemical automatic control.
Imported pneumatic control valve is widely used in media flow, pressure, temperature automatic regulation. The adjustment method of imported pneumatic control valve is to configure the flow meter when the flow is adjusted, and the signal given by the flow meter can adjust the medium; Pressure is regulated by a signal transmitted through a pressure transmitter during flow regulation. Regulating pressure; The temperature is automatically adjusted by the signal sent by the temperature sensor.
Alias has electric control valves, pressure regulating valve, single valve, pneumatic control valve, the sleeve regulator, two-seater regulator, the 3-way regulating valve, temperature control valve, air volume control valve, self regulating valve, fire dampers, bypass valve, manual valve, cage control valve, micro pressure regulator, small regulator, Angle regulator, rotary valve, leafy regulator, Differential pressure regulating valve, through the regulator, electronic regulator, confluence valve, sealing valve, steam valve, feed water regulator, automatic temperature control valve, explosion-proof valve, regulating valve, stainless steel valve, lining plastic valve, locking the regulator, the regulator of constant flow regulating valve, valve type, brass valve, elevating the regulator, one-way valve, bellows valve, pot Furnace feed water regulating valve, on-site bus regulating valve, etc.
Pneumatic control valve is divided into gas open type and gas off type two. Air open type regulating valve is when the air pressure on the film head increases, the valve to increase the opening direction of action, when the input pressure limit is reached, the valve is in full open state. Conversely, when the air pressure decreases, the valve moves in the closed direction, and when no air is input, the valve is fully closed.
The regulating valve is used to regulate the flow, pressure and liquid level of the medium. According to the adjustment part signal, automatic control valve opening, so as to achieve medium flow, pressure and liquid level adjustment. Control valve electric control valve, pneumatic control valve and hydraulic control valve. This manual mainly introduces two kinds of electric control valve and pneumatic control valve. Regulating valve by electric actuator or pneumatic actuator and adjustment
Key words: pneumatic regulating valve work original dynamic regulating valve gas source pressure