Flanged back check valves for one directional LPG/NH3 flow

Flanged back check valves are one-way valves that protect container contents from escaping if piping or fittings accidentally break. They are usually used in gas installations where a high flow is needed yet restricted to flowing in one direction.

Product description

As back check valves provide a one-way flow security functionality, they are ideal for installation in pipelines flowing into pressure tanks and pump discharge lines as they will close off if the flow-direction changes or stops. The disc design requires a minimal installation space and is thereby suitable for many installations, also as a later modification.

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Body: Carbon steel, stainless steel
Guide: Carbon steel, stainless steel
Spring: Stainless steel
Poppet: Stainless steel

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Gas types: LPG (Propane, Butane), NH3 (Ammonia, Anhydrous Ammonia)
Connections: Flange
Type: ANSI
Operating pressure: 50 bar (720 psi)
Internal pressure: Max. 137 bar (2000 psi)
Temperature range: -45˚C to +148˚C (-50˚F to +300˚F)
Sizes and range: 1" to 10"
Series: 167, 218 and 230 models
Standards: UL listed, CE-PED

*Materials and specifications are subject to generalisation. Our experienced people are ready to help you find the correct fit for your application. 

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  • Wafer Type is designed to fit inside Schedule 160, 80 or less steel pipe
  • Wafer type: Fits inside the bolts of 150 or 300-pound American Standard steel pipe flanges
  • Flanged type is designed to fit between 150 or 300-pound American Standard steel pipe flanges 
  • Flanged type. Ring groove flanges can be furnished if required
  • Generous flow channels provide minimal pressure drops
  • Available in carbon steel or stainless-steel

Did you know?

A disc type can be installed between two flanges

Flange back check valves can be specially requested in 12"

A threaded back check valve can be installed inside a threaded flange

Alternative products

  • Photos of Threaded Back Check Valves

    Back check valves (threaded)

    One-way valves that prevent the contents of a container from escaping if the piping or fittings unexpectedly break. Back check valves close off if the direction of flow changes, or if flow stops.

    See our Threaded back check valves

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