(Super) Duplex Steel Check Valve A890 GR4A

A check valve, clack valve, non-return valve or one-way valve is a mechanical device, a valve, which 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, and/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. The bodies (external shells) of most check valves are made of plastic or metal.

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.

Applicable standards:
Check Valve Design:  API 6D / BS 1868
Steel valves, ASME B16.34
Face to face: ASME B16.10
Flanges ends: ASME B16.5
Buttwelding ends: ASME B16.25
Inspection and test: API 598 / API 6D

Design description:
Bolted Bonnet Cap / Bolts Cover
Pressure Seal Bonnet / Pressure Seal Cover
Swing Type, Anti-rotation Disc
Renewable Seat Rings
Non-penetrate Disc Shaft
Horizontal Servece
Size: 2"-48"
Pressure: 150LB-2500LB
Connection: Flanges,RTJ Flange,Butt Weld,Groove
Material:
A890 GR4A, A890 GR5A, A890 GR6A,
Also CY-40, Inconel 600  

Swing Check Valve Feature:
Bolted Bonnet Cap
Pressure Seal Bonnet
Swing Type, Anti-rotation Disc
Renewable Seat Rings
Non-penetrate Disc Shaft
Horizontal Servece
Size:1/2"-48"
Pressure:150LB-250LB
Connection: Flanges,RTJ Flange,Butt Weld,Groove
Material:
Carbon Steel, Forged Steel, Stainless Steel: WCB,LCB,LCC,LC1,CF8,CF8M,CF3,CF3M,WC6,WC9, C5,C12,C12A
Specifical Material: Duplex Steel, Super Duplex Steel, Inconel: GR4A, GR6A, CY-40, Inconel 600