AAP Forged Steel Piston Check Valve, 1/2"

This AAP forged steel Class 800 piston check valve has a forged ASTM A105 body and bonnet, a 316 stainless steel spring, an SS410 disc, a Stellite seat and socketweld ends. It is supplied in 6 sizes from 1/2" (15mm) to 2" (50mm).

A piston check valve is a type of lift check valve. Forward pressure lifts the disc, which works as a piston in a guide, off its seat to let fluid through. The guide keeps the disc moving in a straight line so it reseats properly, and here a spring helps close it when the pressure drops or flow reverses. The pressure figure is the cold working pressure, so the allowable pressure falls as the temperature rises.

Where this product is used

• Steam lines
• Oil and petrochemical pipework
• Preventing reverse flow on high pressure small bore lines
• Pump and compressor discharge lines where a forged check valve is specified

Features

• 6 sizes from 1/2" (15mm) to 2" (50mm)
• Forged ASTM A105 body and bonnet
• SS410 (2Cr13) disc, hard-faced Stellite seat, 316 stainless steel spring
• Cold working pressure 13,800 kPa (138 bar), maximum 427°C
• Design to ANSI B16.34
• Socketweld to ANSI B16.11

Key specifications

Choosing the right option

Choose the size and the end connection, socketweld, to match your pipework.

Related AAP products: AAP Forged Steel Piston Check Valve, Class 800, NPT, AAP Cast Steel Flanged Check Valve, ANSI 150, AAP Cast Steel Flanged Check Valve, ANSI 300, AAP Stainless Steel 3 Piece Spring Check Valve.