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RPM Diffusion — Professional Marine Valves

Swing check valve

In a swing check valve, a disc hinged on a pin opens under the pressure of the fluid and falls back onto its seat when the flow reverses. When lifted, the disc leaves a wide passage.

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The family covers:

  • female-female threaded check valves in brass and bronze, from DN10 to DN100; the Guidi 1670 data sheet states PN16, an ISO 228-1 thread and metal-to-metal sealing;
  • full-bronze check valves, threaded PN25 and flanged PN6 or PN16;
  • wafer (between flanges) check valves in 316 stainless steel or aluminium bronze, with FKM seal;
  • single-disc steel check valves with NBR or EPDM seal, PN10/16, with a 3.1 certificate stated on the data sheet;
  • threaded stainless steel check valves and a flanged cast iron Medana & Visca model.

Sizes range from DN10 to DN500. How to choose: the material for the fluid (below the waterline in seawater, the site's configurator recommends bronze or stainless steel), the nominal pressure, the connection, and the seal material (NBR, EPDM or FKM) for the temperature. Follow the flow direction marked on the body and check on the data sheet which installation positions are allowed.

For a valve that can be fitted in any position, see also disc and spring check valves; for a suction line, the foot valve.

Brands: RPM and Medana & Visca.

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