Composition and classification of self operated regulating valve

Self operated regulating valve, as its name implies, is a kind of valve that can be adjusted and controlled by itself. It is precisely because of this characteristic that it is highly sought after and loved in the valve industry, and it is widely used. Now let's take a look at the composition and classification of self operated regulating valve together with the small compilation!

Self operated regulating valve is a kind of control device that can automatically adjust according to the preset value by relying on the pressure, temperature or flow change of the measured medium itself without external energy. It is an energy-saving instrument. It integrates control and execution functions. It is an independent instrument control system. It integrates the functions of transmitter, controller and actuator. It is different from the control valve in the general sense.

Self operated regulating valves include self operated pressure (micro pressure) regulating valve, self operated (differential pressure) flow regulating valve and self operated temperature regulating valve. The self operated pressure regulating valve is one of its family members. Because it does not require external energy, its product structure is simple, it is easy to use, and its maintenance workload is small, it is especially suitable for urban heating, heating, and the situation where there is no power supply and gas supply needs to be controlled.

Composition of self operated pressure regulating valve

Self operated pressure regulating valve is a self-contained pressure controller valve. Generally speaking, the medium pressure changes with the change of medium flow. When the medium flow changes, in order to ensure constant pressure, self operated regulating valve is required to control.

Self operated pressure regulating valve is composed of three major elements, namely:

1. Flow limiting element: valve, etc;

2. Measuring elements: pressure gauge, valve membrane, piston, etc;

3. Load elements: spring, weight, manpower, etc.

Classification of self operated pressure regulating valves

1. It is divided into self operated rear (pressure reducing) control valve and self operated front (pressure relieving) control valve according to the control behind and in front of the valve.

2. It can be divided into direct acting and director operated self operated regulating valves according to whether there is a director

a. Direct acting self operated regulating valve

The direct acting pressure regulating valve directly controls the valve through the medium itself to achieve the function of pressure regulation. The direct acting pressure regulating valve has the form of pressure taking after the valve and the form of pressure taking before the valve.

Take pressure behind the valve to keep the pressure behind the valve within the set range, so as to achieve the effect of reducing pressure behind the valve.

Take pressure in front of the valve to keep the pressure in front of the valve within the set range, so as to achieve the effect of pressure relief in front of the valve

b. Command operated self operated regulating valve

The pilot operated regulating valve achieves the function of automatic pressure regulation through mutual control between two valves.Difference between self operated pressure regulating valve and control valve

The difference between these two types of products mainly lies in that the control valve not only needs external energy (such as power supply or gas source) as driving energy, but also needs to receive external control instrument signals to change the relative position of the interceptors in the valve, so as to change the fluid flow. The self operated pressure regulating valve does not need external energy and does not need to receive external control instrument signals. It can realize pressure regulation only by the pressure signal of the regulated medium.