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A flexible circuit manufacturer was having a problem with backflow from a large reverse osmosis water storage tank.
In this application, water is fed from a degassifier (removes air bubbles) into a 1 hp, 30 – 50 GPM pump. The pump is used to push the RO water up a 2″ vertical pipeline into a large storage tank. To prevent backflow and siphoning when the pump was off, a check valve was installed on the vertical pipeline.
Unfortunately, a ball-type check valve was specified. As a typical ball check valve, it required 5 PSI reverse pressure to seal. Without sufficient pipe head pressure (over 11′), it could not create a positive seal on the vertical column up to the top of the storage tank. The lack of a positive seal would cause water to back up and flood the reservoir coming out of the degassifier.
The electronics manufacturer turned to Plast-O-Matic’s Series CKS Check Valve. Designed with a special Teflon encapsulated spring (not a “coated” spring), the CKS provides a bubble-tight seal without compromising the ultrapure requirements of the application. Unlike ball-type check valves, the CKS does not require back flow to close – it automatically seals bubble tight with merely the absence of inlet pressure.
More Information: Self-guided poppet and fully encapsulated spring ensure automatic bubble tight seal — no reverse pressure required. This enables Series CKS to be mounted in any position
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