Dual Disk Check Valve Design Features
Wafer Dual Disc Design Advantage
The face to face design inherently makes this check valve significantly lighter1. The valve is designed to fit between two flanges and requires no flanges of its own. The dual disc check value can installed in any position as the spring aids in keeping the valve closed2. These features allow you to design your piping layout in the most efficient and least expensive fashion.
1 10% of the weight of a conventional swing check
2 Consult factory for vertical downward flow
Shock Bumpers
An integral cast bumper (Fig. 1) is present on all IFC Dual Disc Check values (Except class 125 lb). The bumpers can be found on both discs, which meet when the valve reaches a fully open position. This design feature prevents the discs from pressing against the stop pin and eliminates leverage that would cause unnecessary stresses and wear. The purpose of the stop pin is to prevent over-travel of either disc, which would result in valve failure.
Minimal Seat Wear
The IFC Dual Disc Check Valve was designed to eliminate the possibility of seat wear caused by friction at the heel of the dual discs while maintaining low back pressure sealing capabilities. The clearance between the body, disc and hinge pin results in the discs cracking open at the heel location first (Fig. 5). When the valve opens the heel does not drag across the seating surface and cause wear (Fig. 6). As the valve closes, the spring will take the toe of the disc into the seating surface first, while the line back pressure will force the heels and hinge pin back to the seat to complete the seal (Fig. 7).
Resilient Seat
The basic design of the IFC Dual Disc Check Valve is illustrated in Fig. 2. This seal is chemically bonded using specially designed adhesives that provide rubber tearing bonds throughout the operating range of the seat material. In case of resilient seat failure, the IFC design permits the disc to float and make contact with the metal surface the seats were adhered to. This feature allows the valve to function even if the resilient seat is not present. IFC also has available a seat design illustrated in Fig. 3. This design results in a controlled seat squeeze and provides a metal-to-metal backup seal (Fig. 4).
Retainerless Option
The IFC Series DR Dual Disc Check Valve incorporates a retainerless hinge pin design, such that no screwed plugs are required in the assembly of the valve. This design feature eliminates the potential leak path to atmosphere associated with many competitors’ designs. The IFC Series DR utilizes Allen set screws to retain two pin guides that house both the hinge and stop pins. This allows for quick disassembly of the valve without the use of force or special tools other than an Allen wrench. This unique feature ensures that today’s and the future’s valve fugitive emission requirements are met.
Standards of Construction
|
Component |
Standard |
|
Pressure Boundary Design |
ASME B16.34 |
| Dimensional Criteria | ASME B16.1, B16.42, B16.47, API-594 |
| Pressure/Temp. Rating | ASME B16.1, ASME B16.34 |
| Visual Examination | MSS SP-55 |
| Pressure Testing | API-598 |
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