Safety Relief Valves Brochure

The most effective protection against overpressure from 5 mbar to 45 bar / 0.07 psi to 650 psiTECHNOLOGY FOR GASESSecure your systems and components with safety relief valves from WITTPROTECTION AGAINST OVERPRESSUREFUNCTIONWITT safety relief valves are spring loaded, direct-acting safety relief valves. As soon as the set opening pressure is reached, aspring-loaded element in the valve triggers and opens for blow-ing off. After the pressure equalisation, the valve closes auto-matically and would respond again immediately in the event of arenewed pressure increase. Depending on the gas and applicat-ion, the valves can either blow off freely or be connected to ablow-off pipe. The opening pressure is set at the factory for WITTvalves, appropriate to the permissible operating pressure of thesystem to be protected. MATERIALSWITT safety relief valves are made from high-quality materials.They are extremely robust and suitable for a wide variety of gasesand applications. Brass is normally the standard material used forhousings in numerous applications. For aggressive and corrosivegases, the housings are made from high-quality stainless steel(1.4541/AISI 321, 1.4404/AISI 316L, 1.4305/AISI 303 or 1.4571/AISI316Ti). Depending on the gas type and customer requirement,diverse sealing materials are available, ensuring safety even underthe most demanding conditions. For operators of pressurised systems and components they arethe last line of defense before excess pressure becomes a disaster: Safety relief valves. Safety relief valves from WITT pro-vide effective protection against overpressure by blowing off vapours and gases from pipes, pressure vessels and system com-ponents. WITT offers individually tested safety relief valves withindividually adjustable opening pressures from 5 mbar to 45 bar /0.07 psi to 650 psi Their small size, position-independent instal-lation and sturdy materials allow a wide range of applications.WITT safety relief valves are available in brass, stainless steel oraluminium, also as a manually ventilated version as well as withor without condensate outlet. On request, the individually setopening pressures can be certified with a TÜV (German TechnicalInspectorate) certificate. TANK CONSTRUCTIONNo matter whether transport contai-ners, storage tanks, biogas tanks ormixing and metering vessels –WITTsafety relief valves protect diverse applications in the area of tank construction, even against the lowestoverpressures.INDUSTRIAL FURNACE CONSTRUCTIONIndustrial furnace construction ofteninvolves working with protective gasatmospheres. The process chambersshould be protected against over-pressure – ideally with safety reliefvalves from WITT.WITT safety relief valves safeguard pipes, pressure vessels and system components from excessive gas pressureAPPLICATIONSValve pistonScrewing ringSpring retainerValve sealCompression springHousing1234561236354Closed OpenINSULATORS AND REACTORSInsulators and glove box systems fre-quently involve work in a protectivegas atmosphere. WITT safety reliefvalves protect the housing and thereactors installed to clean the inertgas against overpressure and ensuresafe work.PIPES AND PLANT CONSTRUCTIONPipes with various gases must be pro-tected against overpressure in pipesand system construction. This can in-volve simulation systems, researchplants, systems and pipes for recove-ring helium or also supply facilities fornitrogen shielding in the semiconduc-tor industry.HYDROGEN VEHICLESHydrogen-powered vehicles must beprotected with safety valves in linewith the regulation EC 79/2009. WITToffers a safety relief valve speciallyapproved by the Kraftfahrt-Bundes-amt (German Federal Motor TransportAuthority) for this purpose, therebysatisfying the highest requirements.CONNECTIONSYou can order WITT safety relief valves with various connections.Besides the standard versions with normal male and female thre-ads, designs with KF or CF flanges, VCR or UNF threads are alsoavailable. Adapters are available for connecting to blow-off lines. CERTIFIED QUALITYModern production and a comprehensive quality managementsystem guarantee the highest WITT quality for your safety. WITTsafety relief valves are manufactured in accordance with best engineering practices and the relevant safety regulations for de-sign, material selection and resistance. For maximum security,WITT typically offers a 100% component test for the model seriesSV805/SV805A, in other words, every safety valve of this series isindividually pre-tested to ensure fault-free reliability before it isdelivered. On request, we can also supply an individual accept-ance by TÜV with a certificate (module F according to 97/23/EC)as verification that the opening pressure of each individual valveis correctly set.THE BENEFITS OF WITT SAFETY RELIEF VALVES • Minimum opening pressures make even the smallest pressure rises controllable• Opening pressure individually adjustable depending on the model in the range from 5 mbar to 45 bar / 0.07 psi to 650 psi• High blow-off volume up to approx. 970 m3/h / 34,240 scfh • Diverse applications for all technical gases in the temperature range from -40°C to + 300 °C / -40 °F to 572 °F (varies depending on model)• Suitable for O2• 100 % component testing for maximum safety (SV805/SV805A)• TÜV certificate verifies the individually set opening pressure on request• Compact construction and location-independent installation for problem-free assembly• Optionally available in brass, stainless steel and aluminium (AV919)• Sealing material corresponding to the gas type or on customer request • Various inlet and outlet connections, adapter for connectionto a blow-off pipe• Some models optionally with condensate outlet• Some models with manual ventilation function• Free of oil and greaseOUR PORTFOLIOSV805 AND SV805A• A classic among WITT safety relief valves• Reliably protects tanks and pipes against excess pressure • Individual opening pressure between 0.5 and 45 bar / 7 psi and 652 psi• Maximum volume flow up to approx. 665 m3/h / 23,470 scfh for air• Compliant with Pressure Equipment Directive 97/23/EC• Compact size• Installation irrespective of position• Suitable for numerous applications• On request, also available with a condensate outlet• Model SV805A also has a ventilation function, allowing functionality testing at any time when installed• TÜV individual certification (module F according to 97/23/EC)MATERIALSSV805/SV805AHousing: Brass 2.0402, stainless steel 1.4404 or 1.4541Seal: CR, EPDM, FFKM, FPM, HNBR, Isolast 9610, VMQAV619 AND AV919• The best choice for protection against minimum overpressures at high blow-off volumes• The highest response sensitivity in the range from 5 to 500 mbar / 0.07 to 7 psi makes even the smallest pressure rises manageable• Maximum blow-off volume up to approx. 970 m3/h / 34,240 scfh for air• Reliable protection for tanks, pipes and other system components• Can also be used as vacuum valves for securing an underpressure owing to the high density and a low leakage rate• Installation irrespective of position• TÜV certificate varifies the individually set opening pressure on requestMATERIALS AV619Housing: Brass 2.0401, bright galvanized brass,2.0401, stainless steel 1.4305 or 1.4404Seal: CR, EPDM, FFKM, FPM, HNBR, NBR, natural siliconeAV919Housing: Stainless steel 1.4571, anodised aluminiumSeal: CR, EPDM, FFKM, FPM, NBR, VMQROBUST ALL-ROUNDER SENSITIVE AND STRONG AV319• High safety in mini format – the AV654 is the smallest WITT safety valve• Also protects against lowest overpressures • Very sensitive response with individual opening pressure in the range from 10 to 80 mbar / 0.14 to 1.14 psi• Maximum blow-off volume of approx. 0.9 m3/h / 32 scfh for air• Minimum weight and compact dimensions• Ideal for applications in a closed space or with special weight requirements• Installation irrespective of position• TÜV certificate varifies the individually set opening pressure on requestMATERIALSAV319Housing: Brass, stainless steel 1.4305 or 1.4404 or 1.4571Seal: CR, EPDM, FPM, Isolast, NBRSV811L• Specially developed for securing hydrogen-powered vehicles• Protects hydrogen systems against hazardous overpressure in a wide spectrum from 4.5 to 45 bar / 65 to 652 psi• Corresponds to regulation EC 79/2009 of the European Parliament• Approved by the Kraftfahrt-Bundesamt (German Federal Motor Transport Authority) for use in vehicles• Compact design• Installation irrespective of the position• Diverse connection options• High-quality stainless steel for maximum resistance and endurance• TÜV certificate varifies the individually set opening pressure on requestMATERIALS SV811LHousing: Stainless steel 1.4404Seal: EPDMSMALL AND LIGHTWEIGHT SPECIALIST IN HYDROGEN VEHICLES OVERVIEW OF ALL MODELSCE-marked according toPED 97/23/EG CE0045CE-marked according toPED 97/23/EG CE0045CE-marked according toPED 97/23/EG CE0045CE-marked according toPED 97/23/EG CE0045Approved by the Kraftfahrt-Bundesamt(German Federal MotorTransport Authority) foruse in vehiclesSV 805 SV 805A SV 805-ES SV 805A-ESAV 619AV 619-ESAV919AV919-ESAV319AV319-ESSV811L0.5 bar–45 bar7 psi–652 psi0.5 bar–45 bar7 psi–652 psi0.5 bar–45 bar7 psi–652 psi0.5 bar–45 bar7 psi–652 psi0.005 bar–< 0.5 bar0.07 psi–7 psi0.005 bar–< 0.5 bar0.07 psi–7 psi0.005 bar–< 0,5 bar0.07 psi–7 psi0.005 bar–< 0,5 bar0.07 psi–7 psi10 mbar–80 mbar0.14 psi–1.14 psi10 mbar–80 mbar0.14 psi–1.14 psi4,5 bar–45 bar65 psi–652 psiG 1/4–G 3/41/4”–3/4” NPTG 1/4–G 3/41/4”–3/4” NPTG 1/4–G 3/41/4"–1/2" VCR1/4”–3/4” NPTG 1/4–G 3/41/4"–1/2" VCR1/4”–3/4” NPTG 1/2 – G 11/2”–1” NPTG 1/2 – G 11/2”–1” NPTG 22" NPTG 22" NPTG 1/8G 1/8 9/16 – 18UNFG 1/4 – G 3/41/4"– 3/4" NPTM24 x 11/2” NPTM24 x 11/2” NPTG 1/2 – G 11/2"– 1" NPTG 1/2 – G 11/2”–1” NPTG 22" NPTG 22" NPTG 1/8G 1/8M24 x 1XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXMaterial RemarksModel Opening pressureInlet-connectionOutlet-connectionWith condensation outletInlet filter (optional)Manual ventilationManufactured and certified according to EN ISO 4126-1AD 2000 bulletin A2 and VdTÜV-bulletin 100Single certification (Modul F)Approval according to (EC) No. 79/2009BrassBrassBrassAluminiumanodizedStainlesssteelStainlesssteelStainlesssteelStainlesssteelStainlesssteelCERTIFIED ACCORDINGEN 720-2, ISO 5175, ISO 9001, PED, BAM, UL, TÜVTechnical information FeaturesOther connections available on requestOUR PROMISE? High-quality safety technology? Very good price/performance ratio? Individual safety relief valves and special solutions? Decades long WITT know-howTECHNOLOGY FOR GASESPlease contact us for partners in your countryOUR PRODUCT RANGE• Gas mixing systems• Gas metering systems• Gas analysers• Leak detection systems• Gas pressure vessels• Engineering of customisedsystems• Flashback arrestors• Non-return valves / check valves• Quick couplers• Safety relief valves• Stainless steel devices• Gas filters• Pressure regulators• Outlet points• Lance holders• Ball valves• Automatic hose reels• Test equipment• Accessories• Customised safety equipmentGas Control Equipment Gas Safety EquipmentWITT-Gasetechnik GmbH & Co KGSalinger Feld 4–8 • 58454 Witten POB 2550 • 58415 WittenGermanyTel. +49 (0)2302 8901-0Fax +49 (0)2302 8901-3www.wittgas.com • witt@wittgas.comWITT ITALIA Srl.Via Giovanni XXIII, 1824030 Solza (BG)ItaliaTel. +39 035 4933273Fax +39 035 4948098witt-italia@wittgas.comWITT Gas Techniques Ltd.212, Europa Boulevard WestbrookWarrington, WA5 7TNGreat BritainTel. +44 (0)1925 234466Fax +44 (0)1925 230055witt-uk@wittgas.com WITT Gas Controls LP380 Winkler Drive, STE 200Alpharetta, GA. 30004USATel. +1 888 948 8427Fax +1 877 948 8427witt-usa@wittgas.comWITT FRANCE S.A.R.L.131 Voie de Compiègne91390 Morsang sur OrgeFranceTel. +33 (0)160 151779Fax +33 (0)160 154782witt-france@wittgas.com WITT POLSKA Sp. z o. o.ul. Legnicka 55/UA554-203 WroclawPolskaTel. +48 (0)7135 22856Fax +48 (0)7135 13113witt-polska@wittgas.com WITT Tecnología de Gas, S.L.C/Simón Cabarga N° 2a – Bajo39005 SantanderEspañaTel. +34 942 835142Fax +34 942 835143witt-espana@wittgas.comGUSTUS & PARTNER GmbH Installation – Service – WartungAlt Salbke 6–10, Geb. 5939122 MagdeburgGermanyTel. +49 (0)391 4015246Fax +49 (0)391 4013296gustus@wittgas.comV _ 12 / 2014