Australian Pipeline Valve - Installation, Operation and Maintenance Manual
7
WAFER PATTERN CHECK VALVES - ‘SLP’ & ‘SW’ STYLE
2.6 HORIZONTAL PIPING
Insert valve into pipeline only in the upright position for horizontal service. Install the valve as shown
below so the flap hinge is at the top of the valve and is centred. Where provided, the lifting lug can serve
as a guide. For SLP series the side pin retainer can also be used as a guide. For vertical services the valve
must be used for upward flow only, refer to the arrow on the valve body indicating direction of flow,
refer Diagram 1.
DIAGRAM 2
DIAGRAM 2A
2.7 DISTANCE BETWEEN SINGLE FLAP CHECK VALVE AND A BUTTERFLY VALVE
If you attach another valve to the outlet side of the Supercheck valve, ensure that there is enough
distance between two valves so that the plate of the Supercheck check valve does not touch the disc of
the other valve in the open position. For separating other valves such as butterfly valves, a spacer spool
may be required to stop the disc interfering with the check valve flap.
2.8 ORIENTATION OF SINGLE FLAP WAFER CHECK VALVE TO PUMP DISCHARGE
When mounting the Supercheck valve near a pump, as indicated on Diagram 3, position so that the flow
of the pump meets evenly with the valve. The hinge pin of the Supercheck valve should be at right angles
to the pump shaft. Ideally, for maximum service life keep distance ‘A’ more than 6 times the diameter of
the pipe. For higher pressure the distance should be further away. However, SLP/SW series check valves
should not be used in severe pulsating services such as reciprocating compressor discharges. Install check
valves downstream of any pulsation dampeners or silencers in any system. Consult Diagram 1 for
orientation positions.
DIAGRAM 3
PUMP
A
Check valve
Gaskets
Arrow indicating flow
direction
