Valve model
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1. What do the gate valves Z41H-25 DN400, Z11H-25 DN20, Z41Y-25I DN100, and Z41Y-25PI represent respectively?
http://wenku.baidu.com/view/6b41f3aedd3383c4bb4cd221.html Take a look; it provides a fairly detailed introduction
Z41H-25 DN400: The “Z” denotes a gate valve, “4” indicates flanged connection, “1” means single gate plate, “25” refers to a pressure of 25 kilograms, “H” signifies stainless steel construction. DN400 means a diameter of 400 mm. In short, it is a flanged wedge-type stainless steel gate valve with a pressure of 25 kilograms and a diameter of 400 mm. Similarly, Z11H-25 DN20 represents a threaded gate valve with a pressure of 25 kilograms and a diameter of 20 mm. Z41Y-25I DN100 is a wedge-type gate valve with a diameter of 100 mm and a pressure of 25 kilograms, whose valve body is made of chromium steel. Z41Y-25PI is similar, but it meets American standards
Z41H-25 DN400 flanged single-plate valve; valve body material: alloy steel; operating pressure: 2.5 MPa; nominal diameter: 400 mm. Z11H-25 DN20 threaded single-plate valve; valve body material: alloy steel; operating pressure: 2.5 MPa; nominal diameter: 20 mm. Z41Y-25I DN100 flanged single-plate valve; valve body material: chromium steel; operating pressure: 2.5 MPa; nominal diameter: 100 mm. Z41Y-25PI: same as above, but in accordance with American standards
What everyone is saying is more or less the same, but the Y in that notation indicates that the material of the valve seat or sealing surface is cemented carbide
One is the pressure rating, and the other is the nominal diameter
There are books dedicated to explaining methods for identifying valve models