{"product_id":"conrader-su3-brass-cold-start-valve","title":"Conrader SU3 Brass Cold Start Valve — Reduces Motor Starting Torque","description":"\u003cp\u003eThe Conrader SU3 cold start valve bleeds air from the compressor head during the first few revolutions of startup, reducing the motor's starting torque. It's the simple, reliable fix for oil-lubed pumps that are subject to low temperatures and low starting voltages — for example a contractor unit that sits outside overnight and runs off a long extension cord.\u003c\/p\u003e\n\u003cp\u003eMachined from solid C360 brass with a stainless steel spring and Viton O-ring, the SU3 threads directly into the head or unloader port and includes an in-line check function. It's a compact, maintenance-free way to ensure hard-starting compressors turn over cleanly in cold weather.\u003c\/p\u003e\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Cold start (start unloader) valve with in-line check\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody \/ stem:\u003c\/strong\u003e C360 machined brass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpring:\u003c\/strong\u003e 302 stainless steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Viton O-ring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection:\u003c\/strong\u003e MNPT (male NPT) — see variant for port size\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCracking pressure:\u003c\/strong\u003e ~3 psi\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum close pressure:\u003c\/strong\u003e 30 PSIG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum close pressure:\u003c\/strong\u003e 40 PSIG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum operating temperature:\u003c\/strong\u003e 500°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Horizontal or vertical\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cp\u003eOil-lubricated reciprocating air compressors, contractor and jobsite units, and any compressor exposed to cold starts or marginal starting voltage where reduced startup torque protects the motor.\u003c\/p\u003e\n\u003cp\u003eAvailable in 1\/8\" MNPT and 1\/4\" MNPT port sizes, the Conrader SU3 brass cold start valve is a proven, low-cost upgrade for easier cold-weather starting and longer motor life on oil-lubed air compressor pumps.\u003c\/p\u003e","brand":"Warthog Air Compressor Store","offers":[{"title":"1\/8\" MNPT","offer_id":54270567350547,"sku":"SU3-1\/8","price":3.5,"currency_code":"USD","in_stock":true},{"title":"1\/4\" MNPT","offer_id":54270567383315,"sku":"SU3-1\/4","price":5.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0825\/3141\/8387\/files\/ImageHandler.jpg?v=1781115457","url":"https:\/\/aircompressorstore.com\/products\/conrader-su3-brass-cold-start-valve","provider":"Warthog Air Compressor Store","version":"1.0","type":"link"}