977 Valvola di ritegno doppio battente wafer pn 16





Double swing wafer non-return valve, gauge in accordance with EN 588, with lamellar cast iron body, AISI 316 stainless steel disc, sealed by EPDM elastomer gasket, manufactured in accordance with relevant product standards and management system EN ISO 9001 quality. Product compliant with DM174 of 6/4/2004 (Supply and distribution of water intended for human consumption). Internal and external anti-corrosion coating with FBE epoxy powder (Fusion Bonded Epoxy), blue color RAL 5017, minimum thickness 250 μm. Suitable for horizontal or vertical installation (with upward flow, it is a one-way valve: install according to the flow direction indicated on the body).

Use Case

Heating systems, warm water up to 110 ° C. Air conditioning systems (HVAC). Water treatment and distribution systems, waste water, pumping systems and industrial applications in general. They are not suitable for liquids containing mineral oils, hydrocarbons, steam and liquids that exert an aggressive action on the valve’s EPDM gasket. Other liquids (the choice of the Model “978” valve in AISI 316 stainless steel is recommended) and larger diameters on request.

977 Scheda tecnica valvole di ritegno doppio battente wafer pn 16


Working pressure: PN 10 / PN 16
Design temperature: -10°C / +110°C
Design standard: EN 12234
Face to face: EN 558
Flanges: EN 1092-2
Tests: EN 12266-1, DM174
Coating: Epoxy powder RAL 5017, thickness 200-250 µm


( 1 ) Body: Cast iron GG 25
( 2 ) Seat: EPDM
( 3 ) Disc:  SS AISI 316
( 4 ) Eyebolt: SS AISI 420
( 5 ) Shaft: SS AISI 304
( 6 ) Spring: SS AISI 304
( 7 ) Gasket: PTFE
( 8 ) Gasket: PTFE
( 9 ) Gasket: PTFE
( 10 ) Gland Bush: NBR
( 11 ) Screw: Carbon Steel

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