Self-operated regulating valves are divided into three series: self-operated pressure, differential pressure and flow regulating valves. Self-operated pressure regulating valve can be divided into two types according to the position of pressure point: before valve and after valve. When the pressure point is in front of the valve, the pressure in front of the valve is unchanged. When the pressure point is behind the valve, it is used to adjust the constant pressure of the valve. 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 introduce the differential pressure at both ends of the orifice plate installed on the pipeline into both sides of the air chamber of the membrane actuator to form a self-operated flow regulating valve, or realize the flow regulation after detecting the flow by using the self-operated differential pressure regulating valve in other ways. According to the pressure and temperature of the medium flowing through the valve, the valve can be driven to work automatically without external power supply and secondary instrument. This kind of self-operated regulating valve uses the feedback signal (pressure, pressure difference and temperature) from the valve output end to transmit to the actuator through the signal pipe to drive the valve disc to change the valve opening, so as to achieve the purpose of regulating pressure, flow and temperature. Clothing wholesale regulating valve can be divided into direct action type and indirect action type. Direct-acting type is also called spring-loaded type, and its structure has elastic elements, such as spring, bellows, bellows temperature bag, etc. Using the principle of balance between elasticity and feedback signal. The pilot valve is added to the indirect control valve, which amplifies the feedback signal, and then drives the disc of the main valve to move through the actuator to change the valve opening. Classification: ZZ type direct-acting self-supporting pressure regulating valve ZZV type direct-acting self-supporting micro-pressure regulating valve ZZC type direct-acting self-supporting differential pressure regulating valve ZZYPII type pilot self-supporting pressure regulating valve ZZW type self-supporting temperature regulating valve ZZZD type nitrogen sealing regulating device ZZFX type explosion-proof flame retardant breathing valve.
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