{"product_id":"150-psi-relief-valve-ensure-air-compressor-safety","title":"1\/4ft NPT 150 PSI Air Compressor Relief Safety Valve - Reliable","description":"\u003cp\u003eIn this review the focus is a compact, serviceable safety valve aimed at small air compressor owners and light industrial users who need a dependable overpressure protection device. The New 1\/4' NPT 150 PSI relief valve delivers a simple, preset safety function with a brass body and metal spring construction that resists corrosion; the single biggest reason to buy is its ASME and NB certified safety rating, which provides reassurance for pressure vessel use without complex setup. It is best when you need a straightforward, correctly sized pop-off valve for tanks or small compressor systems.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/4' male NPT inlet:\u003c\/strong\u003e The 1\/4' threaded inlet fits small compressor outlets and tank ports with an outside diameter near 0.54 in for a compact installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e150 PSI preset relief:\u003c\/strong\u003e The valve ships preset to relieve at 150 PSI and is accurate to within +\/- 3 percent for predictable protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass construction:\u003c\/strong\u003e A brass body and brass valve seat provide corrosion resistance and a durable wetted surface for long service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless steel spring and silicon O-ring:\u003c\/strong\u003e The stainless spring and silicon O-ring deliver corrosion resistance and a leak-proof seal to within +\/- 10 percent of relief pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh temperature rating:\u003c\/strong\u003e Rated for use up to 250 degrees F so it can be used in higher temperature environments without softening or failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASME and NB certified:\u003c\/strong\u003e Safety certifications including ASME with UV and NB marks make it suitable for certified pressure vessel applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis valve is aimed at DIYers, small shop owners, and maintenance techs who operate small to medium portable compressors or air tanks and need a certified, preset relief device that does not require adjustment. Its compact 1\/4' inlet and durable materials make it suitable for shop compressors, auxiliary air tanks, and equipment where space is limited.\u003c\/p\u003e\n\u003cp\u003eThose who need a variable or adjustable relief set point, higher flow capacity, or specialized sealing materials should look elsewhere; this model is a fixed 150 PSI relief valve intended for standard air systems rather than custom pressure-control applications.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCertified ASME\/NB construction gives confidence for use on pressure vessels and tanks.\u003c\/li\u003e\n\u003cli\u003eBrass body and stainless spring resist corrosion for longer service life in workshop environments.\u003c\/li\u003e\n\u003cli\u003ePreset 150 PSI with +\/- 3 percent accuracy provides predictable activation without setup.\u003c\/li\u003e\n\u003cli\u003eCompact 1\/4' NPT size fits many small compressors and tank ports cleanly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSome users report mixed results with pressure hold and minor leakage, so careful installation and testing are advised.\u003c\/li\u003e\n\u003cli\u003eFixed set point means it is not suitable where adjustable relief is required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAll Tool Depot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelief Pressure\u003c\/td\u003e\n\u003ctd\u003e150 PSI (preset)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInlet Connection\u003c\/td\u003e\n\u003ctd\u003e1\/4' male NPT (approx 0.54 in OD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring Material\u003c\/td\u003e\n\u003ctd\u003eStainless steel (zinc plated steel spring noted)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeal\u003c\/td\u003e\n\u003ctd\u003eSilicon O-ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Temperature\u003c\/td\u003e\n\u003ctd\u003e250 degrees F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 1\/4' NPT 150 PSI relief valve is a sensible, certified choice for small compressors and tanks that require a compact, reliable safety device. Its brass construction, certified ratings, and preset accuracy make it good value for users who want a fit-and-forget safety valve, but those who need adjustable set points or guaranteed zero leakage may need to test several units or consider higher-flow models.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan this valve be installed directly on a compressor tank?\u003c\/strong\u003e\u003cbr\u003eYes, the valve is ASME and NB certified for pressure vessel use and installs via the 1\/4' male NPT inlet into compatible tank ports.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill the valve hold exactly 150 PSI without leakage?\u003c\/strong\u003e\u003cbr\u003eThe valve is preset to 150 PSI and accurate to +\/- 3 percent, with a silicon O-ring rated to hold within +\/- 10 percent of relief pressure; however, some users report mixed leakage performance, so verify installation and test before relying on it for critical seals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the valve suitable for high temperature applications?\u003c\/strong\u003e\u003cbr\u003eYes, the construction and materials are rated for use up to 250 degrees F for higher temperature environments.\u003c\/p\u003e","brand":"All Tool Depot","offers":[{"title":"Default Title","offer_id":46756748067035,"sku":"B01G2FFB5A","price":7.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51k6mPZ_u0L._AC_SL1000.jpg?v=1747658109","url":"https:\/\/gearmusthave.com\/products\/150-psi-relief-valve-ensure-air-compressor-safety","provider":"GearMustHave","version":"1.0","type":"link"}