Style DF Check Valves
Retainerless Wafer Double Flange Body Double Disc
Models
Use the buttons below to view the models available in your desired body material.
Bronze - Retainerless Wafer Double Flange Body (ASTM B 62, C83600)
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| Size Range | Pressure Class | Body Type | Valve Style |
|---|---|---|---|
| 8" - 48" | 150 lb. | Wafer Flange | DF |
| 8" - 48" | 300 lb. | Wafer Flange | DF |
Nickel Aluminum Bronze - Retainerless Wafer Double Flange Body (ASTM B 148, C95800)
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| Size Range | Pressure Class | Body Type | Valve Style |
|---|---|---|---|
| 8" - 48" | 150 lb. | Wafer Flange | DF |
| 8" - 48" | 300 lb. | Wafer Flange | DF |
Carbon Steel - Retainerless Wafer Double Flange Body (ASTM A 216, Grade WCB)
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| Size Range | Pressure Class | Body Type | Valve Style |
|---|---|---|---|
| 8" - 48" | 150 lb. | Wafer Flange | DF |
| 8" - 48" | 300 lb. | Wafer Flange | DF |
| 12" - 42" | 600 lb. | Wafer Flange | DF |
| 12" - 42" | 900 lb. | Wafer Flange | DF |
316 Stainless Steel - Retainerless Wafer Double Flange Body (ASTM A 351, Grade, CF8M)
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| Size Range | Pressure Class | Body Type | Valve Style |
|---|---|---|---|
| 8" - 48" | 150 lb. | Wafer Flange | DF |
| 8" - 48" | 300 lb. | Wafer Flange | DF |
| 12" - 42" | 600 lb. | Wafer Flange | DF |
| 12" - 42" | 900 lb. | Wafer Flange | DF |
Low Carbon Steel - Retainerless Wafer Double Flange Body (ASTM A 352, Grade LCB)
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| Size Range | Pressure Class | Body Type | Valve Style |
|---|---|---|---|
| 8" - 48" | 150 lb. | Wafer Flange | DF |
| 8" - 48" | 300 lb. | Wafer Flange | DF |
| 12" - 42" | 600 lb. | Wafer Flange | DF |
| 12" - 42" | 900 lb. | Wafer Flange | DF |
Alloy 20 - Retainerless Wafer Double Flange Body (ASTM A 351, Grade CN7M)
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| Size Range | Pressure Class | Body Type | Valve Style |
|---|---|---|---|
| 8" - 48" | 150 lb. | Wafer Flange | DF |
| 8" - 48" | 300 lb. | Wafer Flange | DF |
| 12" - 42" | 600 lb. | Wafer Flange | DF |
| 12" - 42" | 900 lb. | Wafer Flange | DF |
Hastelloy C276 - Retainerless Wafer Double Flange Body (ASTM A 494, Grade CW12MW)
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| Size Range | Pressure Class | Body Type | Valve Style |
|---|---|---|---|
| 8" - 48" | 150 lb. | Wafer Flange | DF |
| 8" - 48" | 300 lb. | Wafer Flange | DF |
| 12" - 42" | 600 lb. | Wafer Flange | DF |
| 12" - 42" | 900 lb. | Wafer Flange | DF |
Monel - Retainerless Wafer Double Flange Body (ASTM A 494, Grade M35-2)
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| Size Range | Pressure Class | Body Type | Valve Style |
|---|---|---|---|
| 8" - 48" | 150 lb. | Wafer Flange | DF |
| 8" - 48" | 300 lb. | Wafer Flange | DF |
| 12" - 42" | 600 lb. | Wafer Flange | DF |
| 12" - 42" | 900 lb. | Wafer Flange | DF |
Duplex - Retainerless Wafer Double Flange Body (ASTM A 351, Grade CD4MCu)
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| Size Range | Pressure Class | Body Type | Valve Style |
|---|---|---|---|
| 8" - 48" | 150 lb. | Wafer Flange | DF |
| 8" - 48" | 300 lb. | Wafer Flange | DF |
| 12" - 42" | 600 lb. | Wafer Flange | DF |
| 12" - 42" | 900 lb. | Wafer Flange | DF |
Features
Keckley retainerless wafer double flange body double disc check valves offer an inexpensive way to properly protect your pipeline against flow reversal.
The Keckley retainerless wafer double flange body double disc check valve features a single cast body without pin retainer holes in the body. This design minimizes prospective leak paths through the valve body making it a preferable option for highly toxic, corrosive, or hazardous gas chemical processing applications. Keckley wafer double flange body double disc check valves are also suitable for liquid, natural gas, steam service, and even vacuum service applications.
Keckley double disc check valves offer a short face-to-face dimension, are lighter in weight than full body check valves, and are double disc spring loaded to provide a low cracking pressure. The design of 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 shafts. The stop shaft stabilizes the discs during high flow rates.
Keckley offers a retainerless wafer double flange body design in bronze, carbon steel, stainless steel, and other specially cast alloys. Keckley wafer double flange body double disc check valves are used in both horizontal and vertical (upward) flow applications. For horizontal flow applications, the shaft should be vertically oriented to the pipeline. For vertical (upward) applications, the shaft should be perpendicular to the piping.
Keckley double disc check valves are normally stocked and available to ship immediately with Buna-n, Viton, EPDM, and metal seats. The standard discs furnished in all units are stainless steel.
Keckley double disc check valves are field serviceable without the need for special tools. They are designed to ASME specifications and conform to API 594 & 6D, as well as tested to API 598 standards.
