Check (Non-Return) Valves

 

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Check (Non-Return)  Valves

Johnson Valves offer check (non-return) valves for wide range of applications, we offer various patterns and connections. We also  offer Storm (Scupper) Valves for the marine industry and Screw Down Non-Return Valves (SDNR) which is a globe valve and lift check valve combined.

Check (non-return) valves, are used  in pipeline systems to allow flow in one direction only.  There are a number of reasons for using check (non-return) valves, which include:

> Protection of any item of equipment that can be affected by reverse flow.
>  To check the pressure surges associated with hydraulic forces.
>  Prevention of flooding.
>  Prevention of reverse flow on system shutdown.
>  Prevention of flow under gravity.
>  Relief of vacuum conditions.

Body  Materials

Aluminium Bronze

Bronze

Carbon Steel

Cast  Iron

Ductile Iron

Plastic (ABS &  uPVC)

Stainless Steel

Patterns

Ball

Disc

Lift

SDNR

Spring Loaded

Storm (Scupper)

Swing

Sealings

EPDM

Viton

Metal

NBR

PTFE

Connections

Flanged

Threaded (BSP & NPT)

Solvent Weld

Wafer