Non-Return Check Valve | None Return Valve in Thermoplastics

Plast-O-Matic Non-return Valves are bubble tight without needing balls or springs !

The unique and patented Plast-O-Matic check valve re-seats with a bubble tight seal regardless of the valves mounting position or reverse flow conditions. All 'Ball style' check valves require gravity and reverse liquid pressure to re-seal.

Two points to consider when selecting a non-return check valve

1. A ball type check or non-return valves must be mounted with the flow direction upwards as gravity is used to seat the ball. A ball check or non-return valve can't be mounted horizontally !

2. Reverse pressure and flow must be present to provide the minimum amount of force seal the ball exactly on the seat without enough pressure the valve will leak. If either of the above conditions are not met, ballcheck valve will leak!

The Plast-O-Matic diaphragm check valve will seal in any position, whether or not flow is present.

To compare the Plast-O-Matic diaphragm non return valve with a ball check or non retuen valve:

Put a Plast-O-Matic diaphragm check valve and place it flow arrow up on a paper towel. Pour a small amount of water into the outlet, lift up the valve, and you will see that it has remained absolutely sealed -- no evidence of dampness on the paper towel.

Now take 'any' ball-style check valve and perform the exact same test -- just be sure to have extra paper towels on hand!

The CKM is the Plast-O-Matic Diaphragm Check Valve and here is a brief list of features.

Unsurpassed performance in a plastic check valve.

Patented diaphragm design provides the ultimate normally-closed, zero reverse-flow valve.

Available pipe sizes 1/2" 3/4" and 1".

Body materials are Geon® PVC, Corzan® CPVC, Glass-filled polypropylene, and Kynar® PVDF.

Seal materials are EPDM and FKM (a litharge-cured elastomer with properties similar to Viton®).

Self-sealing -- not dependent upon gravity, mounting position or reverse flow.

Leak-free sealing protects against the hazards of reverse flow.

Rapid closure helps to eliminate sudden back-flow water hammer.

Union nuts simplify inspection/removal with minimal piping breakdown.

Minimal Cracking Pressure: Valve begins to open for desired flow at approximately 1.0 to 1.5 PSI.

Maximum working pressure is 150 psi inlet, 100 psi backpressure at 77 degrees F, except Glass-filled polypro which is rated 100 psi inlet.

No metal parts internally or externally.

The Plast-O-Matic CKM Check Valves feature rugged thermoplastic construction with no metal parts. As your assurance of quality, every single Plast-O-Matic check valve is individually tested under pressure prior to despatch.

Chem Resist have been the exclusive Plast-O-Matic distributors for over 15 years in the UK. Chem Resist staff have a wealth of application experience and the company hold large stocks of valves, service parts and spares.

You can also visit the Plast-O-Matic page