17 Oct,2026

Check Valve Cracking Pressure: Buyer’s Guide to Selection and Testing

Posted by pans

Quick Answer Check valve cracking pressure is the differential pressure across the valve at which the first detectable forward flow occurs under specified test conditions. With the outlet vented to atmosphere, upstream gauge pressure may approximate this differential. It is not the same as full-open pressure drop or reseat pressure, and it changes with valve […]

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15 Oct,2026

Why Is Your Check Valve Chattering? Sizing, Minimum Flow and Fixes

Posted by pans

Quick Answer Check valve chattering is the rapid, repeated opening and closing of the disc, usually caused by unstable flow forces rather than one defective part. The most common causes are an oversized valve running below its minimum stable flow, pulsating flow, poor installation or worn internals. Confirm the noise pattern first, then compare actual […]

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13 Oct,2026

Cryogenic Ball Valve Design: 7 Checks LNG Buyers Must Make

Posted by pans

Quick Answer A cryogenic ball valve design is suitable for LNG only when the complete valve configuration is qualified for the minimum service temperature. Verify material suitability for the minimum design temperature. Review grades, heat treatment and traceability, together with impact-test results where required, or the documented exemption permitted by the applicable code and project […]

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10 Oct,2026

Globe Valve Trim Types and Materials: 5 Checks for Severe Service

Posted by pans

Quick Answer Globe valve trim is the set of wetted parts that control flow and shutoff: the disc, seat faces, stem and backseat. For severe service, choose trim by damage mechanism, not by material name alone. Erosion, cavitation, galling and thermal cycling each call for a different answer. A plug disc usually gives more progressive […]

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10 Oct,2026

Globe Valve Pressure Drop: Why Cv and Flow Path Decide the Right Size

Posted by pans

Quick Answer Globe valve pressure drop is the head loss caused by fluid passing through the body, seat and throttling element at a stated flow. Cv shows how much flow a valve passes at a defined pressure drop, while the flow path, disc position and trim set the actual loss. A low Cv at the […]

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08 Oct,2026

Ball Valve Fugitive Emissions Testing: 7 RFQ Checks Before You Approve a Quote

Posted by pans

Quick Answer: A low-emission ball valve is only as strong as its evidence. Match the test standard to the valve design, confirm the report covers the exact size, class, materials and stem seal you are buying, and separate type-test qualification from production testing. A logo is not a report for the valve you will install. […]

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07 Oct,2026

Metal Seated vs Soft Seated Ball Valve: Which Should You Buy?

Posted by pans

Quick Answer In the metal seated vs soft seated ball valve decision, the seat sets the practical limit. A soft seat uses a polymer ring against the ball for tight shutoff and low torque at lower cost, but heat, pressure, solids and chemical attack shorten its life. A metal seat uses hard-faced metal contact for […]

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31 mars 2022

Une brève histoire des vannes

Publié par l'administrateur

Les vannes, utilisées aussi bien dans l'industrie que dans la vie quotidienne, permettent de contrôler le débit, la pression et la direction des fluides. Dérivées des vannes en bambou et en liège, elles ont évolué grâce aux bouchons en cuivre et aux innovations de l'ère de la vapeur. Les vannes modernes sont classées selon leur fonction : vannes d'arrêt, de régulation, de non-retour, de division, de sécurité et vannes multifonctions. Le choix de la vanne appropriée dépend des spécifications, les développements futurs étant axés sur l'énergie.

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