The CKD series comprises compact diaphragm check valves designed to prevent reverse flow of extremely corrosive and ultra-pure liquids, available in 1/4" and 1/2" NPT sizes. The valves use a flexible elastomer disc that requires minimal inlet pressure to open and a minimum back pressure of 1/2 PSI to close. They must be installed to allow gravity-assisted sealing, with the disc resting against the seat when flow ceases. Available materials include PVC, polypropylene, PVDF, and PTFE, with EPDM as an alternative. The 1/4" model has an orifice of 3/16" and a flow coefficient of 0.50, while the 1/2" model has a 5/16" orifice and a Cv of 1.00. The valves operate at maximum inlet pressures up to 140 PSI at 75°F and maximum temperatures up to 300°F depending on material.
A specialty diaphragm check valve that opens with virtually no forward pressure. However, Series CKD requires a minimum back pressure of 1/2 PSI to close. When inlet pressure is sensed the sealing disc is pushed off the valve seat opening the valve. In this position the sealing disc is supported internally allowing the valve to operate under high flow conditions with relatively no force or stress on the disc.
1/4″ and 1/2″ sizes in PVC, Natural Polypro, PTFE or PVDF.
| Plast-O-Matic Valves, Inc. | |
|---|---|
| Product Category | Industrial Valves |
| Product Number | CKD |
| Product Name | Diaphragm Check Valve |
| Valve Type | Check; Compact Diaphragm Check Valve |
| Primary Material | PVC; PTFE (optional feature); PP (optional feature); PVDF (optional feature) |
| Media | Extremely Corrosive, Ultra-Pure Liquids |
| Valve Size | 0.25 to 0.50 inch (6.35 to 12.70 mm) |
| Maximum Pressure | 100.00 to 140.00 psi (70.38 to 98.53 m H2O) |
