{"product_id":"st-291-pressure-washer-unloader-valve-5070-psi-oem-replacement-part","title":"ST-291 Pressure Washer Unloader Valve 5070 PSI – OEM Replacement Part","description":"\u003cp data-start=\"0\" data-end=\"167\"\u003e\u003cstrong data-start=\"0\" data-end=\"16\"\u003ePart Number:\u003c\/strong\u003e 6647\u003cbr data-start=\"21\" data-end=\"24\"\u003e\u003cstrong data-start=\"24\" data-end=\"37\"\u003eCategory:\u003c\/strong\u003e Pressure Washer Parts → Unloader Valves → High-Pressure Unloader Valves\u003cbr data-start=\"109\" data-end=\"112\"\u003e\u003cstrong data-start=\"112\" data-end=\"121\"\u003eType:\u003c\/strong\u003e Suttner ST-291 Pressure Washer Unloader Valve\u003c\/p\u003e\n\u003chr data-start=\"169\" data-end=\"172\"\u003e\n\u003cp data-start=\"253\" data-end=\"720\"\u003eThe \u003cstrong data-start=\"257\" data-end=\"319\"\u003eSuttner ST-291 Pressure Washer Unloader Valve (Part #6647)\u003c\/strong\u003e is a heavy-duty OEM replacement pressure-actuated unloader engineered for high-pressure cleaning systems operating up to \u003cstrong data-start=\"441\" data-end=\"450\"\u003e8 GPM\u003c\/strong\u003e and an impressive \u003cstrong data-start=\"469\" data-end=\"482\"\u003e5,070 PSI\u003c\/strong\u003e. Designed for demanding commercial, industrial, and specialized pressure washing applications, the ST-291 provides precise pressure regulation, dependable bypass operation, and superior pump protection under extreme operating conditions.\u003c\/p\u003e\n\u003chr data-start=\"1482\" data-end=\"1485\"\u003e\n\u003ch2 data-section-id=\"939trr\" data-start=\"1487\" data-end=\"1513\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul data-start=\"1515\" data-end=\"1990\"\u003e\n\u003cli data-section-id=\"1cqnf1z\" data-start=\"1515\" data-end=\"1563\"\u003eGenuine Suttner OEM replacement unloader valve\u003c\/li\u003e\n\u003cli data-section-id=\"uudjh5\" data-start=\"1564\" data-end=\"1601\"\u003eRated for pressures up to 5,070 PSI\u003c\/li\u003e\n\u003cli data-section-id=\"1d0ei23\" data-start=\"1602\" data-end=\"1635\"\u003eSupports flow rates up to 8 GPM\u003c\/li\u003e\n\u003cli data-section-id=\"7b3l7s\" data-start=\"1636\" data-end=\"1672\"\u003ePressure-actuated bypass operation\u003c\/li\u003e\n\u003cli data-section-id=\"ij7byw\" data-start=\"1673\" data-end=\"1718\"\u003eHeavy-duty commercial and industrial design\u003c\/li\u003e\n\u003cli data-section-id=\"1guwyoe\" data-start=\"1719\" data-end=\"1780\"\u003eProtects pumps and plumbing components from pressure spikes\u003c\/li\u003e\n\u003cli data-section-id=\"1ba4eai\" data-start=\"1781\" data-end=\"1822\"\u003eMaintains consistent operating pressure\u003c\/li\u003e\n\u003cli data-section-id=\"2orbya\" data-start=\"1823\" data-end=\"1852\"\u003eReliable bypass performance\u003c\/li\u003e\n\u003cli data-section-id=\"145xavd\" data-start=\"1853\" data-end=\"1902\"\u003eDurable construction for demanding applications\u003c\/li\u003e\n\u003cli data-section-id=\"jgkqeb\" data-start=\"1903\" data-end=\"1945\"\u003eIdeal for high-pressure cleaning systems\u003c\/li\u003e\n\u003cli data-section-id=\"1113uyb\" data-start=\"1946\" data-end=\"1990\"\u003eLong service life and dependable operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1992\" data-end=\"1995\"\u003e\n\u003ch2 data-section-id=\"1cgu054\" data-start=\"1997\" data-end=\"2024\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cp data-start=\"2026\" data-end=\"2047\"\u003e\u003cstrong data-start=\"2026\" data-end=\"2042\"\u003ePart Number:\u003c\/strong\u003e 6647\u003c\/p\u003e\n\u003cp data-start=\"2049\" data-end=\"2074\"\u003e\u003cstrong data-start=\"2049\" data-end=\"2066\"\u003eManufacturer:\u003c\/strong\u003e Suttner\u003c\/p\u003e\n\u003cp data-start=\"2076\" data-end=\"2093\"\u003e\u003cstrong data-start=\"2076\" data-end=\"2086\"\u003eModel:\u003c\/strong\u003e ST-291\u003c\/p\u003e\n\u003cp data-start=\"2095\" data-end=\"2145\"\u003e\u003cstrong data-start=\"2095\" data-end=\"2112\"\u003eProduct Type:\u003c\/strong\u003e Pressure Actuated Unloader Valve\u003c\/p\u003e\n\u003cp data-start=\"2147\" data-end=\"2175\"\u003e\u003cstrong data-start=\"2147\" data-end=\"2169\"\u003eMaximum Flow Rate:\u003c\/strong\u003e 8 GPM\u003c\/p\u003e\n\u003cp data-start=\"2177\" data-end=\"2208\"\u003e\u003cstrong data-start=\"2177\" data-end=\"2198\"\u003eMaximum Pressure:\u003c\/strong\u003e 5,070 PSI\u003c\/p\u003e\n\u003cp data-start=\"2210\" data-end=\"2240\"\u003e\u003cstrong data-start=\"2210\" data-end=\"2234\"\u003eMaximum Temperature:\u003c\/strong\u003e 176°F\u003c\/p\u003e\n\u003cp data-start=\"2242\" data-end=\"2272\"\u003e\u003cstrong data-start=\"2242\" data-end=\"2263\"\u003eInlet Connection:\u003c\/strong\u003e 3\/8\" FPT\u003c\/p\u003e\n\u003cp data-start=\"2274\" data-end=\"2305\"\u003e\u003cstrong data-start=\"2274\" data-end=\"2296\"\u003eOutlet Connection:\u003c\/strong\u003e 3\/8\" FPT\u003c\/p\u003e\n\u003cp data-start=\"2307\" data-end=\"2338\"\u003e\u003cstrong data-start=\"2307\" data-end=\"2329\"\u003eBypass Connection:\u003c\/strong\u003e 1\/2\" FPT\u003c\/p\u003e\n\u003cp data-start=\"2340\" data-end=\"2377\"\u003e\u003cstrong data-start=\"2340\" data-end=\"2359\"\u003eOperation Type:\u003c\/strong\u003e Pressure Actuated\u003c\/p\u003e\n\u003cp data-start=\"2379\" data-end=\"2403\"\u003e\u003cstrong data-start=\"2379\" data-end=\"2399\"\u003eOEM Replacement:\u003c\/strong\u003e Yes\u003c\/p\u003e\n\u003chr data-start=\"2405\" data-end=\"2408\"\u003e\n\u003ch2 data-section-id=\"185wcjy\" data-start=\"2410\" data-end=\"2433\"\u003eHow the ST-291 Works\u003c\/h2\u003e\n\u003cp data-start=\"2435\" data-end=\"2503\"\u003eThe ST-291 automatically regulates system pressure during operation.\u003c\/p\u003e\n\u003cp data-start=\"2505\" data-end=\"2538\"\u003eWhen the trigger gun is released:\u003c\/p\u003e\n\u003cul data-start=\"2540\" data-end=\"2751\"\u003e\n\u003cli data-section-id=\"gqbqf0\" data-start=\"2540\" data-end=\"2596\"\u003ePressure rapidly increases within the discharge system\u003c\/li\u003e\n\u003cli data-section-id=\"1r9375l\" data-start=\"2597\" data-end=\"2627\"\u003eThe unloader valve activates\u003c\/li\u003e\n\u003cli data-section-id=\"18q08x3\" data-start=\"2628\" data-end=\"2676\"\u003eWater is redirected through the bypass circuit\u003c\/li\u003e\n\u003cli data-section-id=\"www87g\" data-start=\"2677\" data-end=\"2706\"\u003eExcess pressure is relieved\u003c\/li\u003e\n\u003cli data-section-id=\"1nxqusn\" data-start=\"2707\" data-end=\"2751\"\u003ePumps and related components are protected\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2753\" data-end=\"2786\"\u003eWhen the trigger gun is reopened:\u003c\/p\u003e\n\u003cul data-start=\"2788\" data-end=\"2920\"\u003e\n\u003cli data-section-id=\"ci0hwe\" data-start=\"2788\" data-end=\"2830\"\u003eWater flow returns to the discharge line\u003c\/li\u003e\n\u003cli data-section-id=\"2bocvu\" data-start=\"2831\" data-end=\"2874\"\u003eCleaning pressure is restored immediately\u003c\/li\u003e\n\u003cli data-section-id=\"x5jxhz\" data-start=\"2875\" data-end=\"2920\"\u003eConsistent system performance is maintained\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2922\" data-end=\"3013\"\u003eThis automatic process helps improve equipment longevity while ensuring reliable operation.\u003c\/p\u003e\n\u003chr data-start=\"3015\" data-end=\"3018\"\u003e\n\u003ch2 data-section-id=\"1f0b793\" data-start=\"3020\" data-end=\"3059\"\u003eBuilt for High-Pressure Applications\u003c\/h2\u003e\n\u003cp data-start=\"3061\" data-end=\"3167\"\u003eWith a maximum pressure rating of \u003cstrong data-start=\"3095\" data-end=\"3108\"\u003e5,070 PSI\u003c\/strong\u003e, the ST-291 is ideal for demanding cleaning tasks such as:\u003c\/p\u003e\n\u003cul data-start=\"3169\" data-end=\"3403\"\u003e\n\u003cli data-section-id=\"9goouc\" data-start=\"3169\" data-end=\"3190\"\u003eSurface preparation\u003c\/li\u003e\n\u003cli data-section-id=\"1qxp29s\" data-start=\"3191\" data-end=\"3222\"\u003eIndustrial equipment cleaning\u003c\/li\u003e\n\u003cli data-section-id=\"aeut8\" data-start=\"3223\" data-end=\"3252\"\u003eHeavy equipment maintenance\u003c\/li\u003e\n\u003cli data-section-id=\"11mk2ga\" data-start=\"3253\" data-end=\"3272\"\u003eConcrete cleaning\u003c\/li\u003e\n\u003cli data-section-id=\"1ftw5mk\" data-start=\"3273\" data-end=\"3302\"\u003eCommercial pressure washing\u003c\/li\u003e\n\u003cli data-section-id=\"15gw927\" data-start=\"3303\" data-end=\"3337\"\u003eManufacturing facility wash-down\u003c\/li\u003e\n\u003cli data-section-id=\"1cr7m5f\" data-start=\"3338\" data-end=\"3369\"\u003eOil and gas industry cleaning\u003c\/li\u003e\n\u003cli data-section-id=\"1embcwq\" data-start=\"3370\" data-end=\"3403\"\u003eConstruction equipment cleaning\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3405\" data-end=\"3527\"\u003eIts high-pressure capability allows it to perform reliably in applications where standard unloaders may not be sufficient.\u003c\/p\u003e\n\u003chr data-start=\"3529\" data-end=\"3532\"\u003e\n\u003ch2 data-section-id=\"vx2wyp\" data-start=\"3534\" data-end=\"3556\"\u003eCommon Applications\u003c\/h2\u003e\n\u003ch3 data-section-id=\"1m7fp76\" data-start=\"3558\" data-end=\"3589\"\u003eCommercial Pressure Washing\u003c\/h3\u003e\n\u003cp data-start=\"3591\" data-end=\"3601\"\u003eIdeal for:\u003c\/p\u003e\n\u003cul data-start=\"3603\" data-end=\"3735\"\u003e\n\u003cli data-section-id=\"16yq6rj\" data-start=\"3603\" data-end=\"3629\"\u003eProfessional contractors\u003c\/li\u003e\n\u003cli data-section-id=\"xkh8e3\" data-start=\"3630\" data-end=\"3645\"\u003eFleet washing\u003c\/li\u003e\n\u003cli data-section-id=\"167zffo\" data-start=\"3646\" data-end=\"3672\"\u003eHeavy equipment cleaning\u003c\/li\u003e\n\u003cli data-section-id=\"rn9xwc\" data-start=\"3673\" data-end=\"3704\"\u003eProperty maintenance services\u003c\/li\u003e\n\u003cli data-section-id=\"1s95uuj\" data-start=\"3705\" data-end=\"3735\"\u003eSurface restoration projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"cl0b4i\" data-start=\"3737\" data-end=\"3768\"\u003eIndustrial Cleaning Systems\u003c\/h3\u003e\n\u003cp data-start=\"3770\" data-end=\"3783\"\u003eSuitable for:\u003c\/p\u003e\n\u003cul data-start=\"3785\" data-end=\"3939\"\u003e\n\u003cli data-section-id=\"pq5ogs\" data-start=\"3785\" data-end=\"3807\"\u003eManufacturing plants\u003c\/li\u003e\n\u003cli data-section-id=\"1ygviu8\" data-start=\"3808\" data-end=\"3831\"\u003eProcessing facilities\u003c\/li\u003e\n\u003cli data-section-id=\"1xupl5g\" data-start=\"3832\" data-end=\"3867\"\u003eIndustrial maintenance operations\u003c\/li\u003e\n\u003cli data-section-id=\"cej1p7\" data-start=\"3868\" data-end=\"3906\"\u003eConstruction equipment wash stations\u003c\/li\u003e\n\u003cli data-section-id=\"do56f1\" data-start=\"3907\" data-end=\"3939\"\u003eHigh-pressure cleaning systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3941\" data-end=\"3944\"\u003e\n\u003ch2 data-section-id=\"ctfpuh\" data-start=\"3946\" data-end=\"3969\"\u003ePerformance Benefits\u003c\/h2\u003e\n\u003cul data-start=\"3971\" data-end=\"4210\"\u003e\n\u003cli data-section-id=\"1bl7wox\" data-start=\"3971\" data-end=\"4001\"\u003eReliable pressure regulation\u003c\/li\u003e\n\u003cli data-section-id=\"1bb2u3x\" data-start=\"4002\" data-end=\"4028\"\u003eImproved pump protection\u003c\/li\u003e\n\u003cli data-section-id=\"1ero2xq\" data-start=\"4029\" data-end=\"4054\"\u003eReduced pressure spikes\u003c\/li\u003e\n\u003cli data-section-id=\"jtaebh\" data-start=\"4055\" data-end=\"4082\"\u003eStable operating pressure\u003c\/li\u003e\n\u003cli data-section-id=\"1gpagnp\" data-start=\"4083\" data-end=\"4116\"\u003eConsistent cleaning performance\u003c\/li\u003e\n\u003cli data-section-id=\"3iy2x2\" data-start=\"4117\" data-end=\"4146\"\u003eEnhanced equipment lifespan\u003c\/li\u003e\n\u003cli data-section-id=\"104vb9g\" data-start=\"4147\" data-end=\"4175\"\u003eCommercial-duty durability\u003c\/li\u003e\n\u003cli data-section-id=\"98jhp9\" data-start=\"4176\" data-end=\"4210\"\u003eReduced maintenance requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4212\" data-end=\"4215\"\u003e\n\u003ch2 data-section-id=\"4ju24s\" data-start=\"4217\" data-end=\"4257\"\u003eSigns an Unloader Valve Needs Service\u003c\/h2\u003e\n\u003cp data-start=\"4259\" data-end=\"4306\"\u003eInspect or replace the valve if you experience:\u003c\/p\u003e\n\u003cul data-start=\"4308\" data-end=\"4471\"\u003e\n\u003cli data-section-id=\"zta6im\" data-start=\"4308\" data-end=\"4331\"\u003ePressure fluctuations\u003c\/li\u003e\n\u003cli data-section-id=\"tfjehp\" data-start=\"4332\" data-end=\"4347\"\u003eWater leakage\u003c\/li\u003e\n\u003cli data-section-id=\"1vz4ts\" data-start=\"4348\" data-end=\"4379\"\u003eInconsistent bypass operation\u003c\/li\u003e\n\u003cli data-section-id=\"irubn0\" data-start=\"4380\" data-end=\"4407\"\u003eReduced cleaning pressure\u003c\/li\u003e\n\u003cli data-section-id=\"66ilga\" data-start=\"4408\" data-end=\"4435\"\u003eDelayed pressure response\u003c\/li\u003e\n\u003cli data-section-id=\"1y8znx0\" data-start=\"4436\" data-end=\"4471\"\u003eExcessive wear from long-term use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4473\" data-end=\"4476\"\u003e\n\u003ch2 data-section-id=\"16dprsq\" data-start=\"4478\" data-end=\"4499\"\u003eInstallation Notes\u003c\/h2\u003e\n\u003col data-start=\"4501\" data-end=\"4878\"\u003e\n\u003cli data-section-id=\"1mo9s3e\" data-start=\"4501\" data-end=\"4568\"\u003eVerify compatibility with system pressure and flow requirements.\u003c\/li\u003e\n\u003cli data-section-id=\"1umsem1\" data-start=\"4569\" data-end=\"4613\"\u003eInstall using appropriate thread sealant.\u003c\/li\u003e\n\u003cli data-section-id=\"66pzot\" data-start=\"4614\" data-end=\"4681\"\u003eRoute bypass plumbing according to manufacturer recommendations.\u003c\/li\u003e\n\u003cli data-section-id=\"ajcp51\" data-start=\"4682\" data-end=\"4735\"\u003eInspect hoses, fittings, and pumps before startup.\u003c\/li\u003e\n\u003cli data-section-id=\"w8omez\" data-start=\"4736\" data-end=\"4804\"\u003eTest pressure regulation and bypass operation after installation.\u003c\/li\u003e\n\u003cli data-section-id=\"kxwmkb\" data-start=\"4805\" data-end=\"4878\"\u003eConfirm all components are properly rated for high-pressure operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp data-start=\"4880\" data-end=\"5050\"\u003e\u003cstrong data-start=\"4880\" data-end=\"4894\"\u003eImportant:\u003c\/strong\u003e Because of the extreme pressure capability of this valve, all system components must be rated for the intended operating pressure to ensure safe operation.\u003c\/p\u003e\n\u003chr data-start=\"5052\" data-end=\"5055\"\u003e\n\u003ch2 data-section-id=\"8fimbm\" data-start=\"5057\" data-end=\"5087\"\u003eMaintenance Recommendations\u003c\/h2\u003e\n\u003cul data-start=\"5089\" data-end=\"5339\"\u003e\n\u003cli data-section-id=\"8e7fsu\" data-start=\"5089\" data-end=\"5128\"\u003eInspect regularly for leaks and wear.\u003c\/li\u003e\n\u003cli data-section-id=\"113xamz\" data-start=\"5129\" data-end=\"5161\"\u003eVerify smooth bypass function.\u003c\/li\u003e\n\u003cli data-section-id=\"140018c\" data-start=\"5162\" data-end=\"5205\"\u003eMonitor system pressure during operation.\u003c\/li\u003e\n\u003cli data-section-id=\"jd9knh\" data-start=\"5206\" data-end=\"5246\"\u003eMaintain clean inlet water filtration.\u003c\/li\u003e\n\u003cli data-section-id=\"nu668z\" data-start=\"5247\" data-end=\"5293\"\u003eService or replace worn components promptly.\u003c\/li\u003e\n\u003cli data-section-id=\"1ggsl0v\" data-start=\"5294\" data-end=\"5339\"\u003eFollow Suttner maintenance recommendations.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Suttner","offers":[{"title":"Default Title","offer_id":53429635121515,"sku":null,"price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/9201\/5723\/files\/GeneralSprayers_Logo_250x250_1_372951fd-3e24-40b5-a573-e76598fad7f4.png?v=1782529802","url":"https:\/\/generalsprayers.com\/products\/st-291-pressure-washer-unloader-valve-5070-psi-oem-replacement-part","provider":"GeneralSprayers","version":"1.0","type":"link"}