Description
Keckley Check Valve, Double Disc Retainerless, Series: Style DD, 24 in Nominal, Wafer, 285 psi, 150 lb, Media: Gas/Oil/Water, 8-3/4 in Inlet to Outlet Length, Cast Carbon Steel Body, 316 Stainless Steel/Buna-N/Inconel-X 750 Trim, PTFE, Epoxy Coated, 28-1/4 in, Import
Features:
- The Keckley wafer double disc check valves are constructed from rugged castings that are machined to exacting specification
- A short face-to-face dimension
- Lighter weight, by 80 to 90 percent than non-conventional full-body check valves
- Spring-loaded, double disc design has a low cracking pressure
- The tension spring performs a lifting motion on the disc to prevent excessive wear on the "heel" area of the elastomer seat
- The independent, dual shaft design allows interchangeability of shaft
- The stop shaft stabilizes the disc during high flow rates
- Field serviceable without the need for special tool
- 22-5/8 in minimum companion flange bore
- Cast 316 stainless steel disc, Buna-N seat, inconel X-750 spring, stainless steel spring plate/thrust washer/hinge pin/stop pin/locating piece, carbon steel lifting lug, 316 stainless steel screws
- -20 to 250 deg F seat operating temperature
- 1100 deg F spring maximum operating temperature
- 19000 Cv flow coefficient
- The Keckley wafer double disc check valves are used in both vertical and horizontal application
- For horizontal flow application the shaft should be vertically oriented and contact keckley for downward vertical flow installation
- PTFE thrust washer
Applications:
Liquid or gas where protection from flow reversal in a pipeline is required
Standards/Approval:
- ASTM A216
- GRADE WCB Body
- ASTM A 351
- GRADE CF8M Disc
- ASTM A 182
- GRADE F-316 Spring Plate/Thrust Washer/Hinge Pin/Stop Pin/Locating Piece
- Conform to API 594 & 6D
- Design ASME B16.5
- B16.34
- MSS SP-6/25/55
- Testing API 598
