In a recent order, Plast-O-Matic Valves was chosen by an electronics manufacturer to solve a possible problem. The flexible circuit manufacturer was having a problem with backflow from a large reverse osmosis water storage tank. In this application, water was fed from a degassifier into a 1 hp, 30 – 50 GPM pump. The pump pushed 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, 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.
Plast-O-Matic’s Series CKS Check Valve was chosen as the solution. Designed with a special Teflon encapsulated 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.
Image credit: Plast-O-Matic Valves, Inc.