Check valve beats gravity in vertical pipeline

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Normally Closed Check Valve Beats Gravity in Vertical Pipeline
Encapsulated spring eliminates contamination
Normally-closed check valve is effective in vertical pipeline applications where ball checks fail to seal.

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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Plast-O-Matic Valves, Inc.
When it comes to thermoplastic valves and controls, we are the problem solvers.
Founded in 1967, Plast-O-Matic Valves' ongoing mission is to provide unparalleled customer satisfaction while continually advancing the technology of liquid pressure and flow control. As the quality leader in the development of thermoplastic valves and controls for corrosive and ultra-pure liquids, POM provides a complete line of standard and custom designed solutions for difficult applications. The company is committed to product innovation, engineering excellence, precision manufacturing, 100% quality testing, and hands-on technical assistance. ISO 9001:2015 Registered.

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