Description
Keckley Check Valve, Retainerless Wafer Double Disc, Series: Style DD, 14 in Nominal, Spiral Serrated Raised Face End Style, 275 psi WOG Pressure, 150 lb Pressure Class, 100 deg F, Media: Gas/Oil/Water, 7-1/4 in Inlet to Outlet Length, 316 Cast Stainless Steel Body, 316 Stainless Steel/FKM/Inconel X-750 Trim, Epoxy Coated, 17-3/4 in Dia, Import
Features:
- A short face-to-face dimension
- The spring loaded double disc design creates a low cracking pressure and allows for the valve discs to close prior to any flow reversal minimizing water hammer and/or surges in the media
- Tension on the specially designed spring with extended spring legs allows the disc center section to lift off the seat prior to the outside edge opening preventing seat wear in the center "heel" section of the seating surface
- Standard elastomeric seats can produce zero leakage when correctly specified, loaded and installed
- Metal seating surfaces are precision machined and lapped to a mirror finish to provide a long lasting seal which meets or exceeds the API 598 leakage standard
- Retainerless design check valves have no body penetrations eliminating potential leak paths
- Allows for interchangeability of the hinge pin and stop pin
- Field serviceable without the need for special tools
- 316 stainless steel disc/FKM O-ring seat/inconel X-750 spring
Applications:
Liquid and Gas Applications
Standards/Approval:
- API 594/6D/598
- ASME B16.5/B16.34
- ASTM A 182 Grade F-316 Spring Plate/Thrust Washer/Hinge Pin/Stop Pin/Locating Piece
- ASTM A 351 Grade CF8M Body/Disc
