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
| 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 110 | 120 | 130 | 140 | 150 |
|---|
Gallons per minute
| CV1 (1/8″) | 1.94 | 3.10 | 3.91 | 4.59 | 5.02 | 5.44 | 5.66 | 6.06 | 6.36 | 6.67 | 6.97 | 7.27 | 7.50 | 7.75 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CV2 (I/4″) | 2.02 | 2.85 | 3.46 | 4.00 | 4.43 | 4.86 | 5.27 | 5.65 | 6.02 | 6.36 | 6.93 | 7.25 | 7.52 | 7.78 |
| CV3 (3/8″) | 1.60 | 5.04 | 6.14 | 6.77 | 7.65 | 8.38 | 9.03 | 9.71 | 10.30 | 10.50 | 10.80 | 11.0 | 11.10 | 11.30 |
| 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 |
| CV6 (3/4″) | 4.30 | 9.50 | 32.30 | 37.50 | 42.80 | 47.10 | 51.0 | 54.7 | 58.3 | 61.5 | 64.8 | 67.4 | 70.5 | 73.2 |
| CV8 (1″) | 4.0 | 9.90 | 35.7 | 41.5 | 46.9 | 51.6 | 55.7 | 59.6 | 63.5 | 67.2 | 70.1 | 72.9 | 75.8 | 78.4 |
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
Seal Type
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.
Seal Kits
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 |
|---|---|
| 1/4″ | CV2 SEALS |
| 3/8″ | CV3 SEALS |
| 1/2″ | CV4 SEALS |
| 3/4″ | CV6 SEALS |
| 1″ | CV8 SEALS |
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.