Forged Steel Lift Type Check Valve

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Description

Specification

SIZE RANGE	NPS 1/2" - 50" (DN 15mm - 50mm)
PRESSURE CLASS	ASME 800 - 2500
END CONNECTION	SOCKET, SCREWED, WELD END
MOC	CARBON STEEL, STAINLESS STEEL, ALLOY STEEL, NICKEL ALLOY STEEL
OPERATOR	SELF
DESIGN	API602, BS EN ISO 15761
TESTING	API598, BS EN 12266-1

 

Features

• A Non-Return Valve or Check valves are one-way valve normally allows fluid (liquid or gas) to flow through it in only one direction. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, or inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem.
• An important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the valve will operate. Typically the check valve is designed for and can therefore be specified for a specific cracking pressure.
• A Lift-Check Valve is a check valve in which the disc, sometimes called a lift, can be lifted up off its seat by higher pressure of inlet or upstream fluid to allow flow to the outlet or downstream side. A guide keeps motion of the disc on a vertical line, so the valve can later reseat properly. When the pressure is no longer higher, gravity or higher downstream pressure will cause the disc to lower onto its seat, shutting the valve to stop reverse flow.