Type and classification of the regulator valve modulating valve

The control valve is also known as the control valve, which is a device for changing the flow, pressure, temperature, liquid level and other technological parameters of the regulating pipe in the field of industrial automation process control. It is mainly composed of operation actuator and regulating valve body to accept the relevant signal and change the opening size of the valve so as to achieve continuous adjustment to the technological parameters of the pipeline medium. But the product type of the regulator is a lot, and the control form is changeable, and it is constantly updating and changing, the user should be familiar with this classification method!

In general, the regulator valve body is universal, can be matching with electric actuators or other actuators used, in accordance with the distribution control actuators can be divided into three kinds: electric control valve, pneumatic control valve, self regulating valve

1. Electric regulating valve

Electric control valve is a control valve is widely used, mainly composed of electric actuators and regulating valves, powered by electricity, and by receiving the signal of the controller, drive change the size of the valve switch, adjust the area of the fluid pathway, so as to achieve change of fluid flow, pressure, temperature and other working condition parameters.

2. Pneumatic control valve

Pneumatic control valve with compressed air as the power, the controller of the signal to adjust the area of the fluid channel, in order to change the way that the fluid flow valves, pneumatic control valve is generally adopts pneumatic diaphragm actuator, so also known as pneumatic diaphragm regulating valves, compared with electric control valve without having to take advantages of explosion-proof measures and application range is very wide.

3. Self-regulating valve

Self-reliance type valve, also known as direct acting regulator, is don't need any additional energy, direct use of the energy of modulated medium to manipulate regulating mechanism, to realize automatic control, realize the adjustment of the parameters such as temperature, pressure, flow rate.

The most commonly used classification methods in China are as follows:

According to adjust the form, the flow characteristic, purpose and function of the valve core, shape, special purpose (i.e., special, special valve), valve cover form on classification, other thermometer pressure classification has been omitted.

A. According to the adjustment form, it can be divided into: adjusting type, cutting type and adjusting cutting type;

B. The flow characteristics can be divided into: linear, logarithmic (percentage), parabola, and fast;

C. Classification by use and function:

1. Two valves: mainly used to close or connect the media;>
2. Regulating valve: mainly used for regulating the system, selecting the valve, need to determine the flow characteristics of the regulator;
3. Diverter valve: used for distribution or mixing medium;
4. Cutting valve: usually refers to a valve with a leakage rate of less than one in 100,000.

D. Classification by upper cover: (a) common type; (b) dissipation of heat type; (c) long neck; (d) bellows seal type.

E. Classification by valve core shape: (a) plate valve core; (b) plunger type valve core; (c) window valve core; (d) sleeve valve core; (e) multi-stage valve core; (f) deflection valve core; (g) butterfly valve core; (h) spherical valve core

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