SONGO Control valve types and classification
Regulating valve, also known as control valve, is in the field of industrial automation process control, with power operation to change the adjustment of pipeline medium flow, pressure, temperature, level and other process parameters of the device. Mainly composed of the operating actuator and regulating valve body, to accept relevant signals, change the size of the valve opening, so as to achieve continuous adjustment of pipeline medium process parameters! But the valve's product type is many, and the control form is changeable, but also constantly updating and changing, the user should be seriously familiar with this classification method!
Generally speaking, the valve body is universal, can be matched with the electric actuator or other actuators, according to the control actuator can be divided into three categories: Pneumatic control valve, Electric control valve, Self actuated(Self-operated)pressure control valve.
| Pneumatic control valve |
Electric control valve |
Self actuated(Self-operated)pressure 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. |
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 valve open, closed, the size of the adjust the area of the fluid pathway, so as to achieve change of fluid flow, pressure, temperature and other working condition parameters. |
Self actuated(Self-operated)pressure control valve is also known as direct action type regulating valve, does not need any additional energy, direct use of the energy of the medium to manipulate the regulating mechanism, automatic control, to achieve temperature, pressure, flow and other parameters of the regulation. |
The most commonly used classification methods in China are as follows, according to the regulation form, flow characteristics, purpose and function, spool shape, special purpose (i.e. special, special valve), upper valve cover form and other ways to classify, other thermometer pressure classification has been omitted
1. According to the form of regulation, it can be divided into: regulating type, cutting off type, regulating and cutting off type
2. According to the flow characteristics, it can be divided into: linear, logarithmic (percentage), parabola, fast open
3. Classification by use and function
a). Two-position valve: mainly used to close or connect the medium
b). Regulating valve: mainly used for regulating the system, valve selection, need to determine the flow characteristics of the regulating valve
c). Shunt valve: used for distributing or mixing media
d). Cut-off valve: usually refers to the leakage rate of less than one hundred thousand valve
4. Classification according to the form of upper valve cover:
a) General type
b) Heat dissipation (absorption) type
c) Long neck
d) Bellows sealed type
5. Classification by core shape:
a) Flat panel core
b) Plunger core
c) Window-shaped core
d) Set of simple core
e) Multi-stage core
f) Skew-shaped core
g) Butterfly core
h) Spherical core
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