There is this thing inside the control valve
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Hello everyone, what is this thing inside the control valve? ? ? What is the nominal pressure and nominal diameter of this control valve? ? ? pg4.0dg20
Specification of control valve: PN0.4MPaDN20
Pg probably refers to the face pressure of the valve, right? ? ? ? What dg is referring to is probably the throat diameter of the valve, right? ? ? ? OP, by the way, where did these two codes appear? Is there still a valve schematic in the calculation formula? What type of control valve is it? Independent? Manual? Signal input?
For the pneumatic control valve, the provided data is not very clear.
It should be this one. Different manufacturers use different notation for control valves; generally, it refers to pressure and pipe diameter.
It probably refers to pressure and diameter, right? However, the bore diameter of a control valve includes the interface size and the bore diameter of the valve seat; it is essential to choose the appropriate one based on actual requirements.
Pg and Dg are terms used in the ministry standards, while DN and PN are terms used in the national standards. In the ministry standards, the unit for Pg is “kgf/cm^2 (kilogram-force per square centimeter)”, whereas in the national standards, the unit for PN is “MPa (megapascal)”. That is, 1Pg = 0.1PN； The names Pg and PN are both called “nominal pressure”” ； Dg = DN; in both industry standards and national standards, the unit for Dg and DN is “mm (millimeters)”, and both Dg and DN are referred to as “nominal diameter”.