Check Valves
Check valves that stop water flowing back through the line, in 50 mm, 1.5", 63 mm and 2" sizes. Fit one on the suction side when the pump sits above water level.
Check Valves — frequently asked questions
Where should a check valve be fitted?
On the suction line when the pump sits above the water level, to keep the pump primed; on the return line to stop the filter draining back through the pump; and downstream of a chlorinator or heater to protect them from back-flow when the pump stops.
Which size do I need?
Match the pipe: CV-50 for 50 mm pipe, CV-63 for 63 mm, CV-1.5 for 1.5" and CV-2 for 2". The two-part body is bonded with a special cement and the transparent body lets you see the gate close and confirm any leak-back without dismantling.
Does a check valve add pressure loss?
A small one — the gate opens with the flow and sits fully open at normal circulation. Install it in the flow direction marked on the body, and never on the pump discharge with a closed valve downstream.