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Non-Return (Check) Valves

Valves with soft seat

Valve type Nominal sizes DN RK 70RK 71RK 41RK 44 RK 44SRK 76RK 86RK 86ARK 16ARK 29ARK 49RK 16C

PN 6

1520253240506580100125150200 Non-return valves provided with a metallic disc are also available on request with a soft seat made of:

1 /
2 "
3 /
4 " 1 " 1
1 /
4 " 1
1 /
2 " 2 " 2
1 /
2 " 3 " 4 " 5 " 6 " 8 " W

EPDM (ethylene-propylene rubber) suitable for water and steam, –40 to +150 °C.

Hot-pressed brass / valve disc of plastic Heating installations up to 100°C, compressed-air systemsHot-pressed brass / valve disc of austenitic steel For flanges PN 6 / 10 / 16 Heating installations, higher temperaturesSpecial brass / valve disc of austenitic steel W

FPM (fluoro-rubber) for mineral oil and gases, –25 to +200 °C.

For flanges PN 6 / 10 / 16 Liquids, gases, vapours / for industrial and heating plantsCast brass / valve disc of austenitic steel Please order these sizes as RK 41 Please order these sizes as RK 86A Grey cast iron / plastic PN 6 / 10 / 16 W

PTFE (Teflon) for corrosive media, –190 to +250 °C.

Liquids, gases, vapoursCast bronze PN 6 / 10 / 16 Seawater and drinking waterChromium steel / valve disc of austenitic steel PN 6 / 10 / 16 Grey cast iron PN 6 / 10 / 16 Liquids, gases, vapours / for industrial and heating plantsStainless steel / valve disc of austenitic steel

CE

PN 6 / 10 / 16 / 25 / 40 – ASME Class 150 / 300 RF Liquids, gases, vapours / high corrosion resistanceAustenitic steel Grey cast iron / cast bronze PN 6 / 10 / 16 PN 6 / 10 / 16 / 25 / 40 – ASME Class 150 / 300 RF

The products comply with the requirements of the EU Pressure Equipment Directive 97/23/EC. Classified for use with fluids of group 1 and/or 2 (dangerous and non-dangerous substances). Some nominal sizes fall under the exception rule (Article 3.3) and therefore may not bear any CE marking. For further information, please see our Price List.

Corrosive liquids, gases, vapours, acids, alkalisAustenitic steel PN 6 / 10 / 16 / 25 / 40 – ASME Class 150 / 300 RF Corrosive liquids, gases, vapours, acids, alkalisAustenitic steel PN 10 / 16 / 25 / 40 – ASME Class 150 / 300 RF Liquids, gases, vapours / high corrosion resistanceHigh-temperature austenitic cast steel Cast bronze PN 6 / 10 / 16 PN 63 / 100 / 160 / 250 / 320 / 400 – ASME CL. 400 – 2500 Liquids, gases, vapours at high temp. (up to 450°C)Hastelloy C or equivalent nickel alloys PN 63 / 100 / 160 Particularly corrosive media PN 10 / 16 / 25 / 40 Steel / cast steel PN 10 / 16 / 25 / 40 Aust. steel /aust. cast steel PN 10/16/25/40 Austenitic steel PN 63 / 100 / 160 On requestHigh-temperature ferritic cast steel
Industrial TechnologyHeating, venting, sanitary and air-conditioning

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