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. This kind of regulating valve is divided into direct acting and indirect acting. The direct-acting type is also called the spring-loaded type, and its structure has elastic elements such as springs, bellows, 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. If it is a pressure regulating valve, the feedback signal is the outlet pressure of the valve, which is introduced into the actuator through the signal pipe. If it is a flow control valve
, there is an orifice plate (or other resistance device) at the outlet of the valve, and the pressure difference signal is taken out from both ends of the orifice plate and introduced into the actuator. If it is a temperature control valve, there is a temperature sensor (or a temperature bulb) at the outlet of the valve to drive the actuator through the thermal expansion and contraction of the medium in the temperature sensor.
come in many forms, like types of industrial valves and types of industrial valves, and they all provide efficient solution for our types of industrial valves needs.
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