{"product_id":"asme-safety-relief-valve-1-8-in-npt-250-psi","title":"ASME Safety Relief Valve, 1\/8 in NPT, 250 PSI, 118 CFM","description":"\u003cp\u003eAn ASME coded safety relief valve set at 250 PSI with a 1\/8 in NPT connection. It is the smallest port size in the range and suits small receivers, pilot and control circuits and equipment where there is no room for a 1\/4 in valve.\u003c\/p\u003e\n\u003ch3\u003eSpecification\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e S1221\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection:\u003c\/strong\u003e 1\/8 in NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSet pressure:\u003c\/strong\u003e 250 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacity:\u003c\/strong\u003e 118 CFM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCode:\u003c\/strong\u003e ASME coded\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSizing a safety valve properly\u003c\/h3\u003e\n\u003cp\u003eTwo things have to be right, and people usually only check one. The set pressure has to be at or below the maximum allowable working pressure of whatever it is protecting, and the capacity has to be at least the full output of the compressor feeding it. A valve with the right set pressure but not enough capacity will lift and still let pressure climb, which is the failure mode you least want.\u003c\/p\u003e\n\u003cp\u003eAt 250 PSI this is a high set pressure valve. It is not the part for a 175 PSI shop receiver, where a valve set at or just above the tank rating is what you want. Check the data plate on the vessel before you choose.\u003c\/p\u003e\n\u003ch3\u003eFitting it\u003c\/h3\u003e\n\u003cp\u003eFit it directly to the vessel or line it protects, with nothing that can be shut off between the valve and what it is protecting. No valves, no restrictions, no long runs of small tube. Keep the outlet clear and pointed somewhere safe, since it will discharge hot air at full pressure without warning.\u003c\/p\u003e\n\u003cp\u003eUse pipe thread sealant sparingly on the threads only and never on the seat. Do not tighten by the body cap, and do not adjust or dismantle an ASME coded valve: once the seal is broken the code rating goes with it.\u003c\/p\u003e\n\u003ch3\u003eTesting and replacement\u003c\/h3\u003e\n\u003cp\u003eLift the test ring periodically so the valve is known to be free, on a tank at pressure and with eye and ear protection on. If it weeps after testing, replace it rather than tapping it; a seeping safety valve is telling you the seat is damaged.\u003c\/p\u003e\n\u003ch3\u003eRelated parts\u003c\/h3\u003e\n\u003cp\u003eWe also stock ASME safety relief valves in 1\/4, 1\/2, 3\/4, 1 and 1-1\/4 in in a range of set pressures, Kunkle 6010 valves for larger systems, discharge check valves and pilot unloader valves.\u003c\/p\u003e\n\u003ch3\u003eNot sure which one\u003c\/h3\u003e\n\u003cp\u003eTell us the vessel rating from the data plate and the output of the compressor feeding it, and the Warthog Air Compressor Store team will confirm the right valve before you order.\u003c\/p\u003e\n\u003cp\u003eASME coded safety relief valve, 1\/8 in NPT, 250 PSI set pressure, 118 CFM capacity, for small receivers and control circuits.\u003c\/p\u003e","brand":"AirComParts","offers":[{"title":"1\/8 in NPT - 250 PSI - 118 CFM","offer_id":67734909419795,"sku":"S1221","price":16.49,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorstore.com\/products\/asme-safety-relief-valve-1-8-in-npt-250-psi","provider":"Warthog Air Compressor Store","version":"1.0","type":"link"}