Skip to content
RPM Diffusion — Professional Marine Valves

Flanges and expansion joints

Flanges join pipes, valves and equipment in a way that can be dismantled; expansion joints take up thermal expansion and vibration between two pipe runs; gaskets seal the joint between two flanges.

Read more

Flanges: weld neck (butt-welded), slip-on and plate flanges, lap joint, blind and threaded flanges, from DN10 to DN700. Two systems coexist: PN-designated flanges to EN 1092-1, here from PN6 to PN40, and pressure-class flanges to ASME B16.5, here classes 150 and 300. Materials: P280GH, A105 or A350 LF2 steel, 316 and 316L stainless steel, bronze, aluminium, galvanised or zinc-plated steel.

Expansion joints: threaded, with an NBR body and bronze unions (water, seawater and diesel, from -15 to +90 °C according to the data sheet), or flanged, with an NBR or EPDM bellows. The data sheets of some flanged expansion joints state Bureau Veritas, DNV, ABS, Lloyd's or ACS.

Flange gaskets: NBR or EPDM rubber, fibre, aramid, compressed fibre board.

To choose, start from the DN and the nominal pressure (or class) of the installation: two components with the same DN and the same PN have compatible mating dimensions. Also check the sealing face stated in the product name.

Brands: RPM and Guidi.

72 products

Flange

See the 41 products “Flange”

Threaded expansion joint

Flanged expansion joint

See the 17 products “Flanged expansion joint”

Spacer spool

Flange gasket

See the 9 products “Flange gasket”