Description of the definition and classification of the regulating valve

Definition of regulating valve
The regulating valve, also known as the control valve, is the device used in the process control system to change the flow of the fluid. The International Electrotechnical Commission's IEC defines a regulating valve (known as the Control Valve in foreign countries) as: "The terminal component formed by the power operated device in the industrial process control system. It includes a valve component with a change in the internal fluid flow rate. The valve body member is in turn coupled to one or more actuators. The actuator is responsive to signals from the control member. It can be seen that the regulating valve is composed of two parts: an actuator and a valve member.
 
Regulating valve classification
 
There are many types of regulating valves. With the continuous improvement of the process and performance of various types of complete sets of equipment, the types of regulating valves are still increasing, and there are many classification methods.
First, classified by driving method
Manual adjustment valve
2. Electric control valve
3. Pneumatic control valve
4. Self-operated regulating valve
 
Second, according to the nominal diameter classification
1. Small diameter regulating valve DN≤40
2. Medium diameter regulating valve DN50～300
3. Large diameter regulating valve DN≥350
 
Third, according to the nominal pressure classification
1. Vacuum regulating valve Working pressure is lower than standard atmospheric pressure
2. Low pressure regulating valve PN≤1.6MPa
3. Medium pressure regulating valve PN2.5～6.4MPa
4. High pressure regulating valve PN10～80MPa
5. Ultra high pressure regulating valve PN>80MPa
 
Fourth, according to the media working temperature classification
1. High temperature regulating valve t>450°C
2. Medium temperature regulating valve 120°C≤t≤450°C
3. Normal temperature regulating valve 29°C≤t≤120°C
4. Low temperature regulating valve -100 °C ≤ t ≤ -29 ° C
5. Ultra-low temperature regulating valve t<-100°C
 
5. Classification according to the material of the valve body
1. Non-metallic material regulating valves such as ceramic regulating valves, FRP regulating valves, plastic regulating valves...
2. Metal material regulating valve, such as cast steel regulating valve, stainless steel regulating valve, Hastelloy regulating valve, Monel alloy regulating valve...
3. Metal valve body lining regulating valve, such as lining lead regulating valve, lining PTFE regulating valve, lining enamel regulating valve...
 
6. Classification by connection
Flange connection control valve
2. Threaded connection control valve
3. Welding connection control valve
4. Clamp connection control valve
5. ferrule connection control valve
 
7. Classification by purpose and role
1. Regulating valve for automatic flow regulation
2. Liquid level automatic adjustment valve
3. Pressure regulating valve
4. Temperature-adjustable regulating valve
 
Eight, classified by mobile type
Straight stroke control valve
2. Angle adjustment valve
 
Nine, according to the adjustment type classification
Adjustable type
2. Cut-off type
3. Adjust the cut type
 
X. Classification by flow characteristics
Straight line
2. Equal percentage
Parabola
4. Quick open
 
XI, according to the type of upper bonnet
1. Standard type (ordinary type)
2. Heat dissipation type
3. Long neck type
4. Bellows sealed type
 
12. According to the shape of the valve core:
Flat valve spool
2. Plunger spool
3. Window spool
4. Sleeve spool
5. Multi-stage spool
6. Deflection spool
7. Butterfly spool
8. Ball valve core