Working principle and characteristics of self-supporting control valve

by:Lianke Valve     2022-07-21
Self-operated control valves are divided into three series of self-operated pressure, differential pressure and flow control valves, plug valves, control valves, steam traps, pressure reducing valves, hydraulic control valves, and filters. The self-operated pressure regulating valve is divided into two categories: front and rear of the valve according to the position of the pressure point. When the pressure point is in front of the valve, it is used to regulate the constant pressure before the valve; when the pressure point is behind the valve, it is used to adjust the pressure behind the valve to be constant. . When the pressure before and after the valve is introduced into both sides of the air chamber of the actuator at the same time, the self-operated differential pressure regulating valve can adjust the pressure at both ends of the regulating valve to be constant, or the pressure difference at both ends of the orifice plate installed on the pipeline can be introduced into the membrane to perform the operation. On both sides of the air chamber of the mechanism, a self-operated flow regulating valve is formed, or a self-operated differential pressure regulating valve is used to realize the flow regulation after the flow is detected in other ways. Relying on the pressure and temperature of the medium flowing through the valve itself as an energy source to drive the valve to work automatically, no external power supply and secondary instruments are required. This kind of self-operated regulating valve uses the feedback signal (pressure, differential pressure, temperature) of the valve output to transmit to the actuator through the signal pipe to drive the valve disc to change the opening of the valve, so as to achieve the purpose of regulating pressure, flow and temperature. Clothing wholesale regulating valves are divided into two types: direct-acting and indirect-acting. The direct-acting type, also known as the spring-loaded type, has elastic elements in its structure: such as springs, bellows, and bellows-type temperature bulbs, etc., using the principle of balance between elastic force and feedback signal. Indirect-acting regulating valve, a pilot (pilot valve) is added, which amplifies the feedback signal and then drives the main valve disc to change the valve opening through the actuator. Classification: ZZY type direct-acting self-operated pressure regulating valve ZZV type direct-acting self-operating micro-pressure regulating valve ZZC type direct-acting self-operating differential pressure regulating valve ZZYPII type pilot-operated self-operating pressure regulating valve ZZW type self-operating temperature regulating valve ZZD type Nitrogen sealing adjustment device ZZFX type explosion-proof flame retardant breathing valve.
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