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RPM Diffusion — Professional Marine Valves

Check valve

A check valve, or non-return valve, lets the fluid flow in one direction only and closes when the flow reverses.

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Several designs are available in this family:

  • swing check: a hinged disc pivots on a pin; this is the case of the Guidi 1670 valve, in brass or bronze, PN16, with an ISO 228-1 parallel thread and metal-to-metal sealing;
  • dual-plate check, in aluminium bronze, PN20;
  • spring, disc or ball check: a spring or the weight of the closing member shuts the valve; according to their data sheet, some 316 stainless steel disc check valves can be installed in any position;
  • foot valve: a check valve combined with a strainer, at the end of a suction line.

Sizes range from DN8 to DN500, with threaded, flanged, wafer (between flanges) or press-fit connections. Materials: bronze, brass, 316 stainless steel, cast iron, steel, aluminium bronze, copper-nickel, PVC. Seals are NBR, EPDM or FKM.

To choose, check on the data sheet the nominal pressure (mostly PN6 to PN25), the permitted installation positions and the seal material for the fluid and temperature. Certificates stated depending on the model: 3.1, Lloyd's and RINA.

Brands: RPM, Guidi, Medana & Visca and TruDesign.

53 products

Flanged check valve

Press-fit check valve

Dual plate check valve

Swing check valve

See the 16 products “Swing check valve”

Ball check valve

Foot valve

Disc check valve

Spring check valve

Check valve

RPMVX2

Check valve

2 variants

from €15.55 excl. VAT

See the 13 products “Spring check valve”