Check Valves Β· Swing Check Valves
Non Slam Swing Check Valves
Non slam swing check valves are the low-water-hammer execution of the swing check principle: a spring-assisted disc closes before reverse flow can build, so the abrupt stop that slams a conventional swing check is designed out rather than damped after the fact. The benchmark execution on the collected page covers DN40 to DN600 at Class 150 to Class 2500, with a stainless spring and shaft, EPDM or NBR seat rings, and flanged or buttweld installation per ANSI B16.5 / B16.47 / B16.25 faces.
Part of the Swing Check Valves family
Last updated: 2026-11
Specifications
| size range | DN40 to DN600 |
|---|---|
| pressure class | Class 150 to Class 2500 |
| body materials | Cast Iron, Ductile Iron |
| disc materials | Ductile Iron, Aluminium Bronze, Stainless Steel |
| end connections | ANSI B16.25 |
| design standards | API 6D |
| testing standards | API 598 |
| face to face | ASME B16.10 |
| spring materials | Stainless Steel |
| shaft materials | Stainless Steel |
| seat ring materials | EPDM, NBR |
| flange standards | ANSI B16.5, ANSI B16.47 |
Application & selection guidance
Select this execution where the check valve sits close to equipment that hammer would damage - pump discharges, high-rise risers, or long lines with fast-closing duty - and size by the nominal diameter band DN40 to DN600 against the line class up to Class 2500. Confirm the seat ring compound (EPDM or NBR) against the medium temperature, and match the end face standard to the mating flange or weld preparation. Where noise and surge are secondary and cost leads, a conventional swing check remains the simpler choice.
Frequently asked questions
What makes a swing check valve "non slam"?
A conventional swing check disc travels a wide arc and lands only after reverse flow has developed, which produces the slam. The non slam execution adds a spring acting on the disc so closure begins as forward flow decays, before significant reverse velocity builds. The benefit is lower surge pressure and quieter operation, at the cost of a spring component and slightly higher cracking pressure.
Which end connections does this execution cover?
The benchmark page declares flanged faces to ANSI B16.5 and B16.47 and a buttweld dimension to ANSI B16.25, so the valve installs into standard flanged lines and welded lines alike. Match the face standard and rating to the mating pipe class rather than assuming interchangeability across the DN40 to DN600 range.
What information is needed to quote a non slam swing check valve?
Nominal size inside the DN40 to DN600 band, pressure class up to Class 2500, medium and temperature (to fix the EPDM or NBR seat ring), end connection (flanged per B16.5/B16.47 or buttweld per B16.25), and the installation orientation. Those points let the execution, seat compound and face standard be confirmed in one pass.
Ordering & documentation
Documents
Ask for the documentation set you need with the inquiry β typical items for this execution (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
A quotation-ready inquiry states: nominal size and pressure rating, body and seat material preference, end connection, operation, and the service medium with temperature. Typical values on this page are benchmark reference ranges; the binding values are confirmed at quotation.
Sample & supply
Supply terms, order quantities and lead time are agreed per order β state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, keep end-face protectors on until installation, and for elastomer- or PTFE-seated executions avoid prolonged outdoor storage β seat compounds age fastest in direct sunlight and freezing conditions.
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