Waverley Brownall

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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.

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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.

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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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What is check valve cracking pressure?

 

What is check valve cracking pressure?

mini check valve sectioned stainless steel
(Pictured) Miniature Check Valve

Cracking pressure is the inlet pressure at which the first sign of flow occurs. Although often used with liquids, check valves are also used in industrial processes which handle gases and chemicals. Back pressure refers to the difference in pressure between the inlet and the outlet of the valve. When the cracking pressure is reached, the valve will open to allow flow of the material, when it drops, the valve will close.

*Adjustable springs allow for a variety of cracking pressures.

(PSI)
Miniature check valve cracking pressure – 3, 5, 10, 20, 40, 60, 100, 150
Standard check valve cracking pressure – 5, 15, 25, 30, 45

What is a check valve?

A check valve, is a type of valve used in areas of instrumentation tubing or pipeline to control the flow of a gas or liquid. It allows the inner material to flow through a single direction (unidirectional) with minimal pressure drop.

Also known as a non-return valve or two-port valves, they come in many different forms. Examples of this include ball check, stop-check and lift-check valves. Pneumatic non-return valves will be used when a check valve is insufficient, Eg. where there is a risk of chemical spillage or excessive flooding.

Our check valves consist of a main body, spring, poppet, O-ring, body seal and end cap.

Working Pressures

CHECK-VALVES-SMALL

Waverley Brownall check valves are tested for sealing performance based on BS 6755 Pt.1. The tests consist of both low and high pressure shell for up to 4,500 psi, the equivalent of 310 Bar. Miniature check valves feature a working pressure of up to 6000 psi with a cracking pressure from 3 to 350 psi. A minimal pressure drop and bubble-tight shut off are included in both check valve series.

Our check valves are available in sizes from 1/4″ up to 1″ in stainless steel, with a working pressure of up to 3000 psi. This is the equivalent to 206.8427 bar. Optional end connections for thread forms include NPT (National Pipe Taper), BSPT and BSP.

Tables showing pressure drop (psi) vs flow (SCFM) for air flow vs. water can be found in our precision valves catalogue. Sizes tested include 1/4″, 3/8″, 1/2″ and 1″. The O-ring is in material PFTE/Viton with varying temperature range capability. A nominal cracking pressure of 5, 15, 25, 30 and 45 psi with others on request.

Helpful links:

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Miniature Check Valves In Stainless Steel | Small Check Valves

Miniature Check Valves In Stainless Steel | Small Check Valves

The Waverley Brownall miniature check valve (MCV) series are valves that are a compact, one body piece valve used for unidirectional flow. Our stainless steel miniature check valves can be used for the control of flow up to a 6000psi rating with minimal pressure drop.

Get A Quote

Stainless Steel Miniature Check Valves  (Overview)

Features Applications
Working pressure up to 6000psi Prevents reverse flow
Fully encapsulated seal One-piece machined body
Variety of cracking pressures Stainless steel 316
Minimal pressure drop Special metals options
Expert design and manufacture Liquid or vapour service
Adjustable spring Low pressure relief valve
Fully contained O-Ring seal Air and water flow

Testing

Waverley Brownall check valves have been tested for sealing performance based on BS 6755 Pt1. Low pressure and high pressure tests.

Seal Kits

Seal kits are supplied for necessary maintenance and consist of poppet O ring seal.

Cleaning and Packaging

All miniature check valves are dispatched fully degreased and sealed. Cleaning for oxygen use on application.

Springs

Spring material is 304 stainless steel with body piece of 316 stainless steel. Please specify material preferences on order.

  • Up to 6000psi
  • A range of end connections are available
  • Fully encapsulated seal (choice of seal)
  • Variety of cracking pressures up to 350psi
  • Minimal pressure drop
  • Bubble-tight shut off
  • Standard CV check valves are also available in stainless steel which is a Poppet type valve for flow control procedures (single and double ferrule OD compression compatible.)
  • Valve connections in NPT, BSPT and BSP threads
  • Official Waverley Brownall product
  • Material certification provided on request
  • Fully boxed and packed securely in branded packaging with the Waverley Brownall logo present
  • Valves will be marked with a cast code as standard
  • Highly corrosion-resistant alloys can be used to manufacture your miniature check valves – Get your quote for this service on enquiries@waverleybrownall.co.uk 
Get A Quote

End connections include both male and female threaded formats and twin ferrule compression fitting ends (Ringlok.)

Other Valves From Waverley Brownall

Waverley Brownall manufacture and supply a wide range of valves within the UK and across the world. This includes ball valves, relief valves, CV series check valves, needle valves and manifolds.

enquiries@waverleybrownall.co.uk

For any questions, please email us at the address above and your question will be sent to the appropriate team member.

Waverley Brownall always do our utmost to reply to emails within a few days or less, depending on the urgency of your requirements.