The Wafer Swing Check Valve incorporates several features distinguishing it from conventional check valves for silent, fast, non-slam operation. The most prominent of these is the accurately machined disc and its special quick closing action. Spring loading of the Stainless Steel disc assures instantaneous closure to reversing flow, preventing build-up of momentum, which is the cause of damaging water hammer. The hinge pin design assures free movement of the disc and eliminates seizure under extreme conditions.
General Applications
Back flow prevention in pump or multi-pump systems
High slam risk systems up to flow deceleration of 25 m/s2
Combined low line velocity and low pressure tightness
Vacuum breaker for storage tank protection
High capacity/low pressure drop to ensure economical use
Not suitable for pulsating applications
Additional Features
Lightweight, wafer type check valve with face-to-face dimensions according to ISO 5752-2021 Series 16 (Table 17) and EN 558-2022 Series 16 (Table 20)
High flow capacity featuring a special shaped disc with a large opening angle resulting in high Kv values
Spring loaded disc for positive shut-off
Field replaceable O-ring seat
Internal travel stop prevents the disc from slamming against the pipe
Excellent low pressure shut-off The standard low pressure shut-off is less than 0.1 bar (10 kPa)
Slam free operation
| Material Specification | |||
| NO. | DESCRIPTION | CARBON STEEL | STAINLESS STEEL |
| 1 | BODY | A216 WCB | A351 CF8/CF8M |
| 2 | SEAT | EPDM/NBR/VITON/PTFE | EPDM/NBR/VITON/PTFE |
| 3 | DISC | A216 WCB | A351 CF8/CF8M |
| 4 | PLUG | CARBON STEEL | STAINLESS STEEL |
| 5 | SPRING | INCONEL X-750 | INCONEL X-750 |
| 6 | SPACER | SS410 | SS304/SS316 |
| 7 | SHAFT | SS410 | SS304/SS316 |
| Material Specification | ||
| NO. | DESCRIPTION | STAINLESS STEEL |
| 1 | BODY | A182 F316 |
| 2 | DISC | A182 F316 |
| 3 | SEAT | SS316 |
| 4 | EYE BOLT | STAINLESS STEEL |
| 5 | BOLT | A193 B8M |
