GlobalSpec has asked its users about the latest design trends and features related to Check Valves. They have also shared their product applications and tips on how to buy and use these products.
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Q:
What would your design or feature "wish list" be for this product?
14 answers
Answers:
Soft goods suitable for steam sterilization temperatures, materials for lactic acid, sulfuric and sodium hypochlorite, clean sterilizable design for sterile process air, reliable springs, seating pressure and leak rates (ie. swing checks that seat tighter and tighter as the reverse pressure builds.... what is the initial leak rate at 2 psi (will this be sufficient to allow for thermal expansion or will this lock in line pressure and allow the line to pressure up). Sealing ratings similar to valve Type IV, type V, type VI shut off etc.
~David F, Project Manager, San Diego, CA
To bleed in BOTH directions at very slow rates in low load low travel speed conditions, whilst creating an instant seal in one direction, and the ability to revert to slow bi-directional bleed once high impact load dissipates.
~Steve B, Engineering Consultant, Barnetby, UK
To be fast acting (highly responsive to water pressures), light enough not to damage the seals in frequent use, avoid "hunting" causing excessive wear and tear.
~Nic T, Research & Development, Johannesburg, South Africa
Light weight molded product with metal(repairable) internals at a competitive price to Stainless equivalent.
~John B, Marketing/Sales, Carlsbad, CA
Rapid response No oscillation of the moving element Low forward resistance Non-Slam either direction
~Robert W, Process Engineer, San Diego, CA
Smaller, flatter design, easy adjustment of opening pressure shown in inches of water at mouth of valve.
~Rocky S, Design Engineer, Irvine, CA
Lighter, better seal, less losses through the valve, less noise when valve is closing
~Alfredo Rendueles, Engineering Consultant, Maracaibo, Venezuela
Smaller sizes; one quarter inch or less and bleach resistant, ball valve
~Tom K, Purchaser, Leitchfield, Grayson
An O-ring or seal that is compatable for all future additives
~Research & Development, Auckland, New Zealand
Compact of the size, material to suit range of conditions
~Ken Wong, Mechanical designer, Sydney, Australia
Cost effective non-slam device
~Mark C, Marketing/Sales, Farmington, NM
Full flow with laminar flow
~Garth H, Technical Support, Mariposa, CA
Low pressure drop
~Bob C, Design Engineer, Sheffield, UK
Compact
~St. Petersburg, FL

Top
Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of check valves?
11 answers
Answers:
Orientation of installation. (swing checks). Metal vs. Soft seats - when? Minimum lift flow, Seating pressure, Check valves need maintenance (consider double block and bleed on caustic/acid check such that they can be isolated). Spares - don't use 316L in place of special alloys "in emergency" - buy spares (2) for each application and specify for what application. Chatter, hammer, on large swing checks at low flow (steam). Broken springs, how to confirm working (test ports?? Like a backflow preventer on larger systems).
~David F, Project Manager, San Diego, CA
There is a lot of energy released when these valves slam closed in big high pressure water pipelines. Design your supporting valve chamber to carry these repetitive loads.
~Nic T, Research & Development, Johannesburg, South Africa
Determine the satisfactory application life for the check valve and note, stencil, engrave, or document so that timely replacement occurs before failure.
~Ed C, Engineering Consultant, Houston, TX
Remember the upper limits of allowable working pressure limit the resisted flow load, not just in the mechanism, but in the connections too.
~Steve B, Engineering Consultant, Barnetby, UK
Pay attention to your Cv's and your pressure drops, do your homework, this ain't rocket science.
~Mark C, Marketing/Sales, Farmington, NM
Go for quality and reliability and a US made valve over a cheaper import from the orient.
~Rocky S, Design Engineer, Irvine, CA
Effective flow area is small than the same size of pipe.
~Ken Wong, Mechanical designer, Sydney, Australia
If in doubt about usage talk to the suppliers
~Bob C, Design Engineer, Sheffield, UK
Basicly, advices indicated in point 8
~Alfredo Rendueles, Engineering Consultant, Maracaibo, Venezuela
Same as number 8
~Tom K, Purchaser, Leitchfield, Grayson
Wrong type
~Garth H, Technical Support, Mariposa, CA

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