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June 6, 2017 by Waverley Brownall

Flow Rates For Non Return Valves

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.

3

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.

check valve non return valve diagram

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.

1

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.

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Filed Under: Uncategorized Tagged With: check valves, flow rates, non-return valves, stainless steel check valve, stainless steel valve manufacturer

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