Find below the flow rate chart for Non-Return valves manufactured in stainless steel.
Valves are available with working pressures up to 3000 psi and can be supplied to comply with NACE specification.
Pressure drop in PSI
Gallons per minute
|CV 4 (1/2″)||7.15||9.94||11.90||13.70||14.80||16.0||16.90||17.60||18.90||19.90||20.80||21.30||22.40||23.20|
Numbers represented, please note numbers 37.7 is representative of 37.70. Examples: 55.7 = 55.70, 59.6 = 59.60 and so forth. For quick reference only.
Non-Return Valve specification
Parts list and breakdown, including an inlet at the base following from PART F upward to PART A to an outlet.
PART A – Valve Body
PART B – Spring
PART C – Piston
PART D – Piston Seal
PART E – Body Seal
PART F – Valve Seat
P.T.F.E Seals are supplied as standard unless use of Viton seals are necessary.
The use of P.T.F.E seals with non-return valves up to 3/8″ containing a low pressure spring such as 2-5psi, combined with low back pressure, can lead to difficulty in forming a leak-tight seal between the piston seal and the cone seat. This is overcome by using either a Viton seal or a stronger spring. Valve opening pressures of 35 psi are available up to 1/2″, with 2-5 psi only available for 3/4″ and upward.
Replacement seal kits are available and consist of the following items; piston seal, body seal and spring.
Replacement seal kit part numbers for immediate order:
|Valve Size||Part Number|
In Line Filters
A filter should always be placed upstream of the non-return valve when the media has solids suspended in it. If a filter is not used the piston seal may become damaged, so allowing the media to flow back upstream.
Information supplied via WAVERLEY® Components and Products Limited Ltd. Product Catalogue ‘316 Stainless Steel Pipeline Components and Valves’ and is not to be redistributed, copied or shared without a link to the original source under any circumstances.
Information supplied is for reference use only.