{"product_id":"k5-2-pressure-washer-unloader-valve-4-2-6-6-gpm-1450-3000-psi-oem-replacement-part","title":"K5.2 Pressure Washer Unloader Valve 4.2–6.6 GPM 1450–3000 PSI – OEM Replacement Part","description":"\u003cp data-start=\"0\" data-end=\"170\" class=\"PDq2pG_selectionAnchorContainer\"\u003e\u003cstrong data-start=\"0\" data-end=\"16\"\u003ePart Number:\u003c\/strong\u003e 1599\u003cbr data-start=\"21\" data-end=\"24\"\u003e\u003cstrong data-start=\"24\" data-end=\"37\"\u003eCategory:\u003c\/strong\u003e Pressure Washer Parts → Unloader Valves → Flow Actuated Unloader Valves\u003cbr data-start=\"109\" data-end=\"112\"\u003e\u003cstrong data-start=\"112\" data-end=\"121\"\u003eType:\u003c\/strong\u003e General Pump K5.2 Pressure Washer Unloader Valve\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"172\" data-end=\"175\"\u003e\n\u003cp data-start=\"271\" data-end=\"768\"\u003eThe \u003cstrong data-start=\"275\" data-end=\"340\"\u003eGeneral Pump K5.2 Pressure Washer Unloader Valve (Part #1599)\u003c\/strong\u003e is a genuine OEM replacement \u003cstrong data-start=\"370\" data-end=\"402\"\u003eflow-actuated unloader valve\u003c\/strong\u003e designed for commercial and industrial pressure washer systems operating between \u003cstrong data-start=\"484\" data-end=\"503\"\u003e4.2 and 6.6 GPM\u003c\/strong\u003e with adjustable pressures from \u003cstrong data-start=\"535\" data-end=\"557\"\u003e1,450 to 3,000 PSI\u003c\/strong\u003e. Manufactured by \u003cstrong data-start=\"575\" data-end=\"591\"\u003eGeneral Pump\u003c\/strong\u003e, the K5.2 utilizes a balanced piston design that delivers precise pressure regulation, smooth bypass operation, and superior pump protection in demanding cleaning applications.\u003c\/p\u003e\n\u003chr data-start=\"1524\" data-end=\"1527\"\u003e\n\u003ch2 data-section-id=\"939trr\" data-start=\"1529\" data-end=\"1555\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul data-start=\"1557\" data-end=\"2129\"\u003e\n\u003cli data-section-id=\"1yufexy\" data-start=\"1557\" data-end=\"1610\"\u003eGenuine General Pump OEM replacement unloader valve\u003c\/li\u003e\n\u003cli data-section-id=\"1f1fr4f\" data-start=\"1611\" data-end=\"1649\"\u003eFlow-actuated balanced piston design\u003c\/li\u003e\n\u003cli data-section-id=\"b0lena\" data-start=\"1650\" data-end=\"1704\"\u003eDesigned for \u003cstrong data-start=\"1665\" data-end=\"1680\"\u003e4.2–6.6 GPM\u003c\/strong\u003e pressure washer systems\u003c\/li\u003e\n\u003cli data-section-id=\"109tiax\" data-start=\"1705\" data-end=\"1757\"\u003eAdjustable pressure range from \u003cstrong data-start=\"1738\" data-end=\"1757\"\u003e1,450–3,000 PSI\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"nh49g\" data-start=\"1758\" data-end=\"1803\"\u003eMaximum operating pressure of \u003cstrong data-start=\"1790\" data-end=\"1803\"\u003e3,000 PSI\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"gnc41p\" data-start=\"1804\" data-end=\"1858\"\u003eBalanced nozzle technology minimizes pressure spikes\u003c\/li\u003e\n\u003cli data-section-id=\"klevii\" data-start=\"1859\" data-end=\"1906\"\u003eStainless steel and brass internal components\u003c\/li\u003e\n\u003cli data-section-id=\"an1cj\" data-start=\"1907\" data-end=\"1954\"\u003eDual gauge ports for easy pressure monitoring\u003c\/li\u003e\n\u003cli data-section-id=\"1b5xif7\" data-start=\"1955\" data-end=\"2009\"\u003eSmooth transition between operating and bypass modes\u003c\/li\u003e\n\u003cli data-section-id=\"1sa1x6w\" data-start=\"2010\" data-end=\"2043\"\u003eHelps extend pump and hose life\u003c\/li\u003e\n\u003cli data-section-id=\"71ai47\" data-start=\"2044\" data-end=\"2095\"\u003eHeavy-duty commercial and industrial construction\u003c\/li\u003e\n\u003cli data-section-id=\"3iwt53\" data-start=\"2096\" data-end=\"2129\"\u003eOEM-quality fit and performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2131\" data-end=\"2134\"\u003e\n\u003ch2 data-section-id=\"1cgu054\" data-start=\"2136\" data-end=\"2163\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cp data-start=\"2165\" data-end=\"2186\"\u003e\u003cstrong data-start=\"2165\" data-end=\"2181\"\u003ePart Number:\u003c\/strong\u003e 1599\u003c\/p\u003e\n\u003cp data-start=\"2188\" data-end=\"2218\"\u003e\u003cstrong data-start=\"2188\" data-end=\"2205\"\u003eManufacturer:\u003c\/strong\u003e General Pump\u003c\/p\u003e\n\u003cp data-start=\"2220\" data-end=\"2235\"\u003e\u003cstrong data-start=\"2220\" data-end=\"2230\"\u003eModel:\u003c\/strong\u003e K5.2\u003c\/p\u003e\n\u003cp data-start=\"2237\" data-end=\"2283\"\u003e\u003cstrong data-start=\"2237\" data-end=\"2254\"\u003eProduct Type:\u003c\/strong\u003e Flow Actuated Unloader Valve\u003c\/p\u003e\n\u003cp data-start=\"2285\" data-end=\"2312\"\u003e\u003cstrong data-start=\"2285\" data-end=\"2300\"\u003eFlow Range:\u003c\/strong\u003e 4.2–6.6 GPM\u003c\/p\u003e\n\u003cp data-start=\"2314\" data-end=\"2348\"\u003e\u003cstrong data-start=\"2314\" data-end=\"2340\"\u003eMaximum Flow Capacity:\u003c\/strong\u003e 6.6 GPM\u003c\/p\u003e\n\u003cp data-start=\"2350\" data-end=\"2396\"\u003e\u003cstrong data-start=\"2350\" data-end=\"2380\"\u003ePressure Adjustment Range:\u003c\/strong\u003e 1,450–3,000 PSI\u003c\/p\u003e\n\u003cp data-start=\"2398\" data-end=\"2429\"\u003e\u003cstrong data-start=\"2398\" data-end=\"2419\"\u003eMaximum Pressure:\u003c\/strong\u003e 3,000 PSI\u003c\/p\u003e\n\u003cp data-start=\"2431\" data-end=\"2461\"\u003e\u003cstrong data-start=\"2431\" data-end=\"2455\"\u003eMaximum Temperature:\u003c\/strong\u003e 195°F\u003c\/p\u003e\n\u003cp data-start=\"2463\" data-end=\"2495\"\u003e\u003cstrong data-start=\"2463\" data-end=\"2484\"\u003eInlet Connection:\u003c\/strong\u003e 3\/8\" BSP-F\u003c\/p\u003e\n\u003cp data-start=\"2497\" data-end=\"2530\"\u003e\u003cstrong data-start=\"2497\" data-end=\"2519\"\u003eOutlet Connection:\u003c\/strong\u003e 3\/8\" BSP-M\u003c\/p\u003e\n\u003cp data-start=\"2532\" data-end=\"2565\"\u003e\u003cstrong data-start=\"2532\" data-end=\"2554\"\u003eBypass Connection:\u003c\/strong\u003e 3\/4\" BSP-M\u003c\/p\u003e\n\u003cp data-start=\"2567\" data-end=\"2588\"\u003e\u003cstrong data-start=\"2567\" data-end=\"2583\"\u003eGauge Ports:\u003c\/strong\u003e Dual\u003c\/p\u003e\n\u003cp data-start=\"2590\" data-end=\"2623\"\u003e\u003cstrong data-start=\"2590\" data-end=\"2609\"\u003eOperation Type:\u003c\/strong\u003e Flow Actuated\u003c\/p\u003e\n\u003cp data-start=\"2625\" data-end=\"2649\"\u003e\u003cstrong data-start=\"2625\" data-end=\"2645\"\u003eOEM Replacement:\u003c\/strong\u003e Yes\u003c\/p\u003e\n\u003chr data-start=\"2651\" data-end=\"2654\"\u003e\n\u003ch2 data-section-id=\"9l89x8\" data-start=\"2656\" data-end=\"2677\"\u003eHow the K5.2 Works\u003c\/h2\u003e\n\u003cp data-start=\"2679\" data-end=\"2795\"\u003eThe K5.2 uses a balanced piston and flow-actuated design to regulate pressure throughout the pressure washer system.\u003c\/p\u003e\n\u003cp data-start=\"2797\" data-end=\"2824\"\u003eWhen the spray gun is open:\u003c\/p\u003e\n\u003cul data-start=\"2826\" data-end=\"2987\"\u003e\n\u003cli data-section-id=\"17gvr3w\" data-start=\"2826\" data-end=\"2870\"\u003eWater flows normally through the unloader.\u003c\/li\u003e\n\u003cli data-section-id=\"9te9qv\" data-start=\"2871\" data-end=\"2927\"\u003eThe balanced piston remains in the operating position.\u003c\/li\u003e\n\u003cli data-section-id=\"1o9ynhs\" data-start=\"2928\" data-end=\"2987\"\u003eFull operating pressure is delivered to the spray nozzle.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2989\" data-end=\"3018\"\u003eWhen the spray gun is closed:\u003c\/p\u003e\n\u003cul data-start=\"3020\" data-end=\"3258\"\u003e\n\u003cli data-section-id=\"1hewgq2\" data-start=\"3020\" data-end=\"3039\"\u003eWater flow stops.\u003c\/li\u003e\n\u003cli data-section-id=\"99tepc\" data-start=\"3040\" data-end=\"3096\"\u003ePressure increases downstream of the internal orifice.\u003c\/li\u003e\n\u003cli data-section-id=\"1udtpx2\" data-start=\"3097\" data-end=\"3131\"\u003eThe piston automatically shifts.\u003c\/li\u003e\n\u003cli data-section-id=\"n7gl8r\" data-start=\"3132\" data-end=\"3179\"\u003eWater is diverted through the bypass circuit.\u003c\/li\u003e\n\u003cli data-section-id=\"1dxjmyr\" data-start=\"3180\" data-end=\"3258\"\u003ePressure spikes are minimized while protecting the pump and plumbing system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3260\" data-end=\"3381\"\u003eThis balanced design provides smoother operation and improved system protection compared to conventional unloader valves.\u003c\/p\u003e\n\u003chr data-start=\"3383\" data-end=\"3386\"\u003e\n\u003ch2 data-section-id=\"vx2wyp\" data-start=\"3388\" data-end=\"3410\"\u003eCommon Applications\u003c\/h2\u003e\n\u003ch3 data-section-id=\"1m7fljq\" data-start=\"3412\" data-end=\"3443\"\u003eCommercial Pressure Washers\u003c\/h3\u003e\n\u003cp data-start=\"3445\" data-end=\"3455\"\u003eIdeal for:\u003c\/p\u003e\n\u003cul data-start=\"3457\" data-end=\"3595\"\u003e\n\u003cli data-section-id=\"1mppnl2\" data-start=\"3457\" data-end=\"3491\"\u003eMobile pressure washing trailers\u003c\/li\u003e\n\u003cli data-section-id=\"1hb3h7x\" data-start=\"3492\" data-end=\"3515\"\u003eFleet washing systems\u003c\/li\u003e\n\u003cli data-section-id=\"17a9h0z\" data-start=\"3516\" data-end=\"3551\"\u003eContractor-grade pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"na2n4z\" data-start=\"3552\" data-end=\"3574\"\u003eBuilding maintenance\u003c\/li\u003e\n\u003cli data-section-id=\"9ezizr\" data-start=\"3575\" data-end=\"3595\"\u003eEquipment cleaning\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"m9dt0u\" data-start=\"3597\" data-end=\"3630\"\u003eIndustrial Cleaning Equipment\u003c\/h3\u003e\n\u003cp data-start=\"3632\" data-end=\"3645\"\u003eSuitable for:\u003c\/p\u003e\n\u003cul data-start=\"3647\" data-end=\"3796\"\u003e\n\u003cli data-section-id=\"1i0u86j\" data-start=\"3647\" data-end=\"3673\"\u003eManufacturing facilities\u003c\/li\u003e\n\u003cli data-section-id=\"9bm7jy\" data-start=\"3674\" data-end=\"3707\"\u003eAgricultural equipment cleaning\u003c\/li\u003e\n\u003cli data-section-id=\"1q52hyj\" data-start=\"3708\" data-end=\"3734\"\u003eIndustrial wash stations\u003c\/li\u003e\n\u003cli data-section-id=\"aeut8\" data-start=\"3735\" data-end=\"3764\"\u003eHeavy equipment maintenance\u003c\/li\u003e\n\u003cli data-section-id=\"yh93sz\" data-start=\"3765\" data-end=\"3796\"\u003eMunicipal cleaning operations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1m4yfbj\" data-start=\"3798\" data-end=\"3825\"\u003ePressure Washer Systems\u003c\/h3\u003e\n\u003cp data-start=\"3827\" data-end=\"3843\"\u003eCompatible with:\u003c\/p\u003e\n\u003cul data-start=\"3845\" data-end=\"4009\"\u003e\n\u003cli data-section-id=\"e1w54q\" data-start=\"3845\" data-end=\"3874\"\u003eBelt-drive pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"1d973ig\" data-start=\"3875\" data-end=\"3906\"\u003eDirect-drive pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"g7mqf6\" data-start=\"3907\" data-end=\"3935\"\u003eHot water pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"1l5zndh\" data-start=\"3936\" data-end=\"3965\"\u003eCold water pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"ljit72\" data-start=\"3966\" data-end=\"4009\"\u003eCustom commercial pressure washer systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4011\" data-end=\"4014\"\u003e\n\u003ch2 data-section-id=\"ctfpuh\" data-start=\"4016\" data-end=\"4039\"\u003ePerformance Benefits\u003c\/h2\u003e\n\u003cul data-start=\"4041\" data-end=\"4265\"\u003e\n\u003cli data-section-id=\"13mgugy\" data-start=\"4041\" data-end=\"4070\"\u003ePrecise pressure regulation\u003c\/li\u003e\n\u003cli data-section-id=\"1nzrik5\" data-start=\"4071\" data-end=\"4096\"\u003eSmooth bypass operation\u003c\/li\u003e\n\u003cli data-section-id=\"1ero2xq\" data-start=\"4097\" data-end=\"4122\"\u003eReduced pressure spikes\u003c\/li\u003e\n\u003cli data-section-id=\"1bb2u3x\" data-start=\"4123\" data-end=\"4149\"\u003eImproved pump protection\u003c\/li\u003e\n\u003cli data-section-id=\"1gpagnp\" data-start=\"4150\" data-end=\"4183\"\u003eConsistent cleaning performance\u003c\/li\u003e\n\u003cli data-section-id=\"1kjg8fj\" data-start=\"4184\" data-end=\"4213\"\u003eExtended equipment lifespan\u003c\/li\u003e\n\u003cli data-section-id=\"2ks8i6\" data-start=\"4214\" data-end=\"4239\"\u003eLower maintenance costs\u003c\/li\u003e\n\u003cli data-section-id=\"1n877ue\" data-start=\"4240\" data-end=\"4265\"\u003eReliable OEM durability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4267\" data-end=\"4270\"\u003e\n\u003ch2 data-section-id=\"x2tt67\" data-start=\"4272\" data-end=\"4316\"\u003eSigns an Unloader Valve Needs Replacement\u003c\/h2\u003e\n\u003cp data-start=\"4318\" data-end=\"4364\"\u003eInspect or replace the unloader if you notice:\u003c\/p\u003e\n\u003cul data-start=\"4366\" data-end=\"4567\"\u003e\n\u003cli data-section-id=\"zta6im\" data-start=\"4366\" data-end=\"4389\"\u003ePressure fluctuations\u003c\/li\u003e\n\u003cli data-section-id=\"irubn0\" data-start=\"4390\" data-end=\"4417\"\u003eReduced cleaning pressure\u003c\/li\u003e\n\u003cli data-section-id=\"1g7kb8v\" data-start=\"4418\" data-end=\"4450\"\u003eWater leakage around the valve\u003c\/li\u003e\n\u003cli data-section-id=\"op63ib\" data-start=\"4451\" data-end=\"4482\"\u003eDifficulty adjusting pressure\u003c\/li\u003e\n\u003cli data-section-id=\"1vz4ts\" data-start=\"4483\" data-end=\"4514\"\u003eInconsistent bypass operation\u003c\/li\u003e\n\u003cli data-section-id=\"1n6rxvr\" data-start=\"4515\" data-end=\"4541\"\u003eDelayed trigger response\u003c\/li\u003e\n\u003cli data-section-id=\"16xn7rj\" data-start=\"4542\" data-end=\"4567\"\u003eExcessive internal wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4569\" data-end=\"4572\"\u003e\n\u003ch2 data-section-id=\"16dprsq\" data-start=\"4574\" data-end=\"4595\"\u003eInstallation Notes\u003c\/h2\u003e\n\u003col data-start=\"4597\" data-end=\"5053\"\u003e\n\u003cli data-section-id=\"jswuv9\" data-start=\"4597\" data-end=\"4680\"\u003eVerify compatibility with your pressure washer's flow and pressure requirements.\u003c\/li\u003e\n\u003cli data-section-id=\"obykb\" data-start=\"4681\" data-end=\"4741\"\u003eInstall using the proper BSP fittings and thread sealant.\u003c\/li\u003e\n\u003cli data-section-id=\"1q33z2i\" data-start=\"4742\" data-end=\"4838\"\u003eConnect the inlet, outlet, and bypass ports according to the pressure washer plumbing layout.\u003c\/li\u003e\n\u003cli data-section-id=\"eiytn6\" data-start=\"4839\" data-end=\"4925\"\u003eInstall a pressure gauge using one of the dual gauge ports for accurate adjustment.\u003c\/li\u003e\n\u003cli data-section-id=\"lnumsj\" data-start=\"4926\" data-end=\"4990\"\u003eSet the operating pressure using a calibrated pressure gauge.\u003c\/li\u003e\n\u003cli data-section-id=\"fp39ip\" data-start=\"4991\" data-end=\"5053\"\u003eMaintain a \u003cstrong data-start=\"5005\" data-end=\"5031\"\u003eminimum 5% bypass flow\u003c\/strong\u003e for proper operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp data-start=\"5055\" data-end=\"5251\"\u003e\u003cstrong data-start=\"5055\" data-end=\"5069\"\u003eImportant:\u003c\/strong\u003e Ensure all pressure washer components—including pumps, hoses, spray guns, fittings, and nozzles—are rated for the intended operating pressure before placing the system into service.\u003c\/p\u003e\n\u003chr data-start=\"5253\" data-end=\"5256\"\u003e\n\u003ch2 data-section-id=\"8fimbm\" data-start=\"5258\" data-end=\"5288\"\u003eMaintenance Recommendations\u003c\/h2\u003e\n\u003cul data-start=\"5290\" data-end=\"5615\"\u003e\n\u003cli data-section-id=\"vakiz1\" data-start=\"5290\" data-end=\"5342\"\u003eInspect the unloader regularly for leaks and wear.\u003c\/li\u003e\n\u003cli data-section-id=\"1bk99f5\" data-start=\"5343\" data-end=\"5397\"\u003eVerify pressure settings during routine maintenance.\u003c\/li\u003e\n\u003cli data-section-id=\"q3d7yn\" data-start=\"5398\" data-end=\"5434\"\u003eKeep inlet water filtration clean.\u003c\/li\u003e\n\u003cli data-section-id=\"1vqtz4t\" data-start=\"5435\" data-end=\"5482\"\u003eMaintain the recommended minimum bypass flow.\u003c\/li\u003e\n\u003cli data-section-id=\"1fv3cus\" data-start=\"5483\" data-end=\"5558\"\u003eReplace worn seals and internal components using genuine OEM repair kits.\u003c\/li\u003e\n\u003cli data-section-id=\"14cgjbx\" data-start=\"5559\" data-end=\"5615\"\u003eFollow General Pump recommended maintenance intervals.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"General Pump","offers":[{"title":"Default Title","offer_id":53433492963691,"sku":null,"price":140.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/9201\/5723\/files\/K5.2UNLOADER.webp?v=1782700477","url":"https:\/\/generalsprayers.com\/products\/k5-2-pressure-washer-unloader-valve-4-2-6-6-gpm-1450-3000-psi-oem-replacement-part","provider":"GeneralSprayers","version":"1.0","type":"link"}