Self operated regulating valve, also known as self operated control valve, is a type of valve that relies on the pressure and temperature of the medium flowing through the valve as energy to drive the valve automatically
The work does not require external power supply or regulating valves for secondary instruments.
Self operated regulating valves are mainly divided into self operated pressure regulating valves, self operated differential pressure regulating valves, self operated temperature regulating valves, and self operated flow regulating valves.
Self operated regulating valves use feedback signals (pressure, pressure difference, temperature) from the valve output end to be transmitted through signal pipes to the actuator to drive the valve disc and change the valve opening, achieving the purpose of regulating pressure, flow rate, and temperature.
Self operated regulating valve is a new type of regulating valve. Compared to manual regulating valves, its advantage is the ability to automatically adjust; Compared to electric control valves, its advantage is that it does not require external power. Practical application has proven that in closed water circulation systems such as hot water heating systems and air conditioning chilled water systems, the correct use of this valve can easily achieve flow distribution in the system; Can achieve dynamic balance of the system; It can greatly simplify the debugging work of the system; Can stabilize the working state of the pump, etc.
direct effect
Direct acting regulating valve, also known as spring-loaded regulating valve, has elastic components in its structure, such as springs, bellows, bellows type thermometers, etc., which use the principle of balancing elastic force and feedback signal.
indirect effect
The indirect acting regulating valve adds a pilot valve that amplifies the feedback signal and 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 regulating 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 regulating valve, there is a temperature sensor (or temperature pack) at the outlet of the valve that drives the actuator through the thermal expansion and contraction of the medium inside the temperature sensor.
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