What do the individual letters in the model number of this chlorine shut-off valve mean?

In the valve model EWJ41Y-25FD-CL: – “EWJ” generally denotes the type of valve; in this case, it refers to a diaphragm-sealed globe valve. - "41\" may refer to a specific design series or model code. - "Y" indicates that the valve body has a Y-shaped design, which is suitable for environments with higher pressures. - "25\" represents the pressure rating of the valve; here, 25 may indicate a pressure rating of 2.5 MPa. - "FD” indicates it is suitable for fluororubber sealing materials. - "CL” indicates that this valve is designed specifically for chlorine (Cl). In the check valve model H41Y-25FD-CL: – “H” represents a check valve. - "The meanings of 41\" and \"Y\" are the same as those mentioned above. - "The explanations for “25”, “FD”, and “CL” are the same as those for stop valves. .

In relation to this, gate valve PN25 RF LF2 CL1/HF, C276 bellows, BB, OS&Y, bellows seal, fugitive emissions, GEST 06/318

For the globe valve of model PN25 RF LF2 CL1/HF, C276 Bellows, BB, OS&Y, Bellows Seal, Fugitive Emissions, GEST 06/318, the meaning of each part is as follows: – “PN25” indicates that the rated pressure of the valve is 25 bar. - "RF” refers to the flange connection type of the valve being Raised Face. - "LF2” refers to the material used for the valve body; ASTM A350 LF2 is a commonly used low-temperature carbon steel. - "CL1/HF” denotes the material grade of the valve seat and valve disc. - "C276” refers to bellows manufactured from Hastelloy C-276, a material with strong corrosion resistance. - "BB” denotes that the valve structure features a bolted bonnet. - "\"OS&Y\" refers to Outside Screw and Yoke, which is a design in which the valve stem and handwheel are exposed to facilitate observing the open and closed state of the valve. - "“Bellows Seal” indicates that the valve uses a bellows seal, which helps improve sealing performance, especially for corrosive gases such as chlorine. - "\"Fugitive Emissions\" refers to valve designs that meet low-leakage standards, suitable for applications with high environmental protection requirements. - "GEST 06/318” is likely an internal standard or model number of the manufacturer. .

WJ – Bellows globe valve; Y – Rigid seal; FD – PTFE and low-temperature steel; CL – Designed for chlorine (liquid chlorine)

Thank you: handshake

…Regarding RF, I did some research... Some say that RF is one of the connection methods for valves and pipe flanges; it is also the most common type. In Chinese, it is called \"convex surface\", which is different from the concave-convex surface. Valve flange sealing surface types: flat (FF), raised face (RF), male face (M), female face (F), mixed face (MF), tenon face (T), groove face (G), tenon-groove face (TG), ring joint face (RJ). I don’t know which one is right :)