The conditioning valve, also known as the control valve, is a device that uses power operation to change the process parameters such as the flow, pressure, temperature, and liquid level of the conditioning pipeline medium in the field of industrial automation process control. It is mainly composed of the operating fulfillment mechanism and the valve body of the conditioning valve, which accepts the relevant signals and changes the opening of the valve, so as to achieve the continuous conditioning of the process parameters of the pipeline medium! However, there are many types of products for conditioning valves, and the control methods are changeable, and they are constantly updated and changed, so users should be familiar with this classification method!
Generally speaking, the valve body of the conditioning valve is universal, and can be matched with the electric actuation mechanism or other actuation mechanism, and can be divided into three varieties according to the control fulfillment device: electric conditioning valve, pneumatic conditioning valve, and self-operated conditioning valve
1. Electric conditioning valve
Electric conditioning valve is a very widely used control valve, mainly composed of electric actuation mechanism and conditioning valve, with electricity as the power, by accepting the signal of the controller, driving to change the size of the valve switch, adjust the area of the fluid path, so as to achieve the flow rate, pressure, temperature and other working parameters of the modified fluid.
Pneumatic conditioning valve
Pneumatic conditioning valve is a valve that uses compressed air as the power and the area of the fluid path is conditioned by the signal of the controller to change the flow of fluid.
3. Self-operated conditioning valve
Self-operated conditioning valve, also known as direct-effect conditioning valve, does not require any external power, directly uses the energy of the adjusted medium to operate the conditioning mechanism, complete automatic control, and complete the conditioning of temperature, pressure, flow and other parameters.
The most commonly used classification methods in China are as follows:
Classification is carried out according to the conditioning method, flow characteristics, usefulness and effect, spool shape, special use (i.e., special, special valve), upper bonnet method, etc., and other thermometer pressure classifications have been omitted! According to the conditioning method, it can be divided into: conditioning type, blocking type, conditioning blocking type:
According to the flow characteristics, it can be divided into: linear, logarithmic (percentage), parabolic, quick open:
3. Classification according to usefulness and effect:
1. Two valves: mainly used to close or connect the medium
2. Conditioning valve: It is mainly used in the conditioning system, and when selecting the valve, it is necessary to confirm the flow characteristics of the conditioning valve;
3. Diverter valve: used for dispensing or mixing media;
4. Blocking valve: Usually refers to a valve with a leakage rate of less than 1/100,000.
Fourth, according to the upper bonnet method: (a) through type; (b) (Heat absorption) type; (c) long-necked; (d) Bellows sealed type
5. Classification according to the shape of the spool: (a) Flat core; () Plug shape; (Mouth shape; () sleeve-shaped; () multi-level; ( Partial shape g) Butterfly spool; (h) Ball valves
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