Self-operated control valves
Self-actuating control valve Faden self-acting proportional control valve VATTEN, Germany
Self-operated control valve, also known as self-operated control valve, is a kind of control valve that relies on the pressure and temperature of the medium flowing through the valve itself as energy to drive the valve to work automatically, and does not require external power supply and secondary instruments. The self-operated control valve uses the feedback signal (pressure, pressure difference, temperature) at the output end of the valve to be transmitted to the actuator through the signal tube to drive the disc to change the opening of the valve self-operated control valve, so as to achieve the purpose of regulating pressure, flow and temperature. Pneumatic membrane control valve is the execution unit of the automatic control system in the industrial production process, which changes the opening angle of the valve according to the signal of the regulating instrument, so as to achieve the adjustment of parameters such as pressure, temperature, flow rate and liquid level.
Construction and working principle
1. Structure: The pneumatic membrane control valve is composed of two parts: the pneumatic membrane actuator and the regulating valve, and the new series of pneumatic actuator mechanism adopts a multi-spring structure. Therefore, the height of the actuator is greatly reduced, the weight is also reduced accordingly, and the valve body part of the regulating valve is a low-flow resistance valve body designed according to the principle of hydrodynamics, and the rated flow system is increased by about 30%. The pneumatic membrane control valve has two modes of action: air opening and air closing, and the selection of air opening and air closing is mainly based on the safety of production, taking into account that when the input signal is interrupted,
The valve is in a fast-closing state that is safe for the system.
2. Working principle: the action of the pneumatic membrane regulating valve is generated by the signal pressure from the regulator, and the thrust is generated in the air chamber of the pneumatic membrane actuator, and the valve core is pushed by connecting rods to produce the corresponding displacement - the so-called stroke, the change of the position of the valve core changes the flow section area of the valve, so as to achieve the purpose of adjusting the flow rate of the medium.
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