Description
Keckley Check Valve, Double Disc Retainerless, Series: Style DD, 4 in Nominal, Wafer, 200 psi, 125 lb, 150 deg F, Media: Gas/Oil/Water, 2-1/2 in Inlet to Outlet Length, Cast Iron Body, 316 Stainless Steel/Buna-N/Cast 304 Stainless Steel Trim, PTFE, Epoxy Coated, 6-7/8 in Dia x 2-1/2 in D, 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
- 4 in minimum companion flange bore
- Cast 304 stainless steel disc, 316 stainless steel spring, 304 stainless steel stop pin/hinge pin, carbon steel plug
- -20 to 250 deg F seat operating temperature
- 500 deg F spring maximum operating temperature
- 290 Cv flow coefficient
- 200 psi at 150 deg F
- 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 A 126
- Class B Body
- ASTM A 351
- Grade CF8 Disc
- ASTM A 182 Spring/Stop Pin/Hinge Pin
- ASTM A 307
- B Plug
- Design ASME B16.1
- Conform to API 594 and 6D
- MSS SP-6/25/55
- Testing API 598
Warranty:
1 Year
