Swing Check Valves

SINGLE DOOR SG LOW & HIGH PRESSURE SWING CHECK VALVES

SIZES: 50 – 300mm (conform to SABS 192. CLASS 40)
SIZES: 50 – 300mm (conform to SABS 144. CLASS 10, 16, 25)

SLAMMING
Swing Check Reflux Valves are subject to slamming on rapid reversal of flow. Valve doors may be balanced by using a counter weight and lever attached to the hinge shaft. It is recommended that all sizes of high pressure reflux valves are fitted with counter weight or hydraulic dampers to regulate speed of closing.

BYPASSES
Valve sizes 200mm and larger may be fitted with bypass assemblies to drain the pipeline downstream of the main valve or in the open position, to relieve surge pressures

The illustrations on this leaflet are subject to modification without notice. Valves are rated 1.6 MPa, 2.5 MPa and 40 MPa working pressure, each valve is subjected to hydraulic pressure test on body and door, without leakage, before leaving the factory.

MATERIALS OF CONSTRUCTION (MINIMUM SPECIFICATIONS)

Body: Speriodal Graphite Iron (SG)
Cover: SG 42 & 50
Door: SG 42 & 50
Hinge Shaft: EN 57 Stainless Steel
Seat Faces: Stainless Steel appropriate to service
Extras Available: Lever and Counterweight

The table below indicates head loss in kPa across right pattern swing check valves mounted in horizontal pipelines, with door shafts supported in low friction bearings and without counterweight or other damping devices affecting movement of the doors. Head loss is indicated at various fluid velocities through the valves of clean water at 200 ºC. The minimum head loss across the valves required to hold the doors in the open position averages 3.5 kPa in all sizes.