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Check Valves

Product catalog summary

Overview: This document is a technical specification sheet for Duff Norton Europe's non-return valves, designed for low or high-pressure hydraulic circuits. These valves prevent flow reversal and protect circuits from overpressure. They are available in various sizes and materials, with options for different types of seals.

Specifications:

Valve Sizes: Available from 1/4" to 2" in diameter.
Materials: Options include chemical nickel-plated steel and stainless steel 316L.
Thread Types: BSPP and NPT threads are available.
Pressure Ratings: Maximum working pressures vary by size, ranging from 300 to 700 bars for K/inox models.

Components:

Body: Made from either chemical nickel-plated steel or stainless steel 316L, depending on the model.
Spring: Constructed from stainless steel across all models.
Tightness: Standard metal/metal seal, with optional synthetic rubber seals such as NITRILE, VITON®, or E.P.D.M. The standard seal is VITON®.

Calibration:

Standard calibration is 0.5 bar for vacuum circuits and 4.5 bars for reversing circuits. Custom calibrations are available upon request, ranging from 0.1 to 10 bars. For EC models, the maximum calibration is 0.5 bar.

Product References:

4000 KM and 4100 KM models feature BSPP and NPT threads, respectively, with nickel-plated steel bodies.
4000 IM and 4100 IM models feature BSPP and NPT threads, respectively, with stainless steel bodies.

Contact Information: Duff Norton Europe, 45, route Nationale, 02310 Romeny-sur-Marne, France. Tel: +33 (0) 3 23 70 70 00, Fax: +33 (0) 3 23 70 70 10, Email: [email protected], Website: www.duffnorton.fr

Catalog excerpts

CLAPET ANTI-RETOUR ETANCHEITE METAL/METAL OU METAL/CAOUTCHOUC NON-RETURN VALVES METAL/METAL OR METAL/RUBBER DESIGNATION Les clapets anti-retour Duff Norton Europe empechent I'inversion du debit dans un circuit ou protegent des surpressions qui peuvent se produire a certains endroits d'un circuit. Le clapet guide peut etre ou non equipe d'un joint en caoutchouc synthetique qui le rend totalement etanche sur circuit eau, gaz, air comprime, etc. TARAUDAGE - ref. 4000 KM : BSPP-F/F - DN 1/4" a 2" (BSPP) - ref. 4100 KM : NPT-F/F - DN 1/4" a 2" (Briggs) PRESSION DE SERVICE Voir tableau DEscRIpTIoN - 4000 KM : acier traite nickel chimique, taraudage BSPP - 4100 KM : acier traite nickel chimique, taraudage NPT - 4000 IM : acier inox 316 L, taraudage BSPP - 4100 IM : acier inox 316 L, taraudage NPT RESSORT Acier inox pour tous les modeles ETANCHEITE STANDARD METAL/METAL, sur demande, clapet avec joint NITRILE, *VITON®, E.P.D.M, etc... (ajouter EC apres M, KM ou I). Standard en *VITON®. Exemple : 4021 KMEC 0,5 bar. TARAGE STANDARD 0,5 bar circuit d'aspiration. Autres tarages sur demande, de 0,1 bar a 10 bar. 4,5 bar circuit de refoulement. Pour EC tarage maxi 0,5 bar. DESIGNATION Duff Norton Europe non return valve for low or high pressure hydraulic circuits prevents reversal of the flow in a circuit or protects the circuit against overpressure. The guided plug can be equipped with a synthetic rubber seal which gives it a complete tightness to water, gas, compressed air. TAppING -ref 4000 KM BSPP-F/F - 0 from 1/4" to 2" -ref 4100 KM NPT-F/F - 0 from 1/4" to 2" WORKING PRESSURE See table DESCRIPTION Body -4000 KM: chemical nickel plated steel, BSPP tapping -4100 KM: chemical nickel plated steel, NPT tapping -4000 IM: stainless steel 316L, BSPP tapping -4100 IM: stainless steel 316L, NPT tapping SPRING Stainless steel on all models TIGHTNESS METAL/METAL. On request, plug with seal, NITRILE, *VITON®, E.P.D.M. (Add EC to the reference after KM or I). Standard: *VITON®. For example: 4021 KMEC 0.5 bar STANDARD CALIBRATION 0.5 bar for vacuum ciruits. 4.5 bars for reversing circuits. Other calibration on request, from 0.1 to 10 bars. For EC max calibration is 0.5 bar.

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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