{"product_id":"k5-1e-pressure-washer-unloader-valve-3-0-4-2-gpm-1450-3000-psi-oem-replacement-part","title":"K5.1E Pressure Washer Unloader Valve 3.0–4.2 GPM 1450–3000 PSI – OEM Replacement Part","description":"\u003cp data-start=\"0\" data-end=\"171\" class=\"PDq2pG_selectionAnchorContainer\"\u003e\u003cstrong data-start=\"0\" data-end=\"16\"\u003ePart Number:\u003c\/strong\u003e 1494\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 K5.1E Pressure Washer Unloader Valve\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"173\" data-end=\"176\"\u003e\n\u003cp data-start=\"273\" data-end=\"778\"\u003eThe \u003cstrong data-start=\"277\" data-end=\"343\"\u003eGeneral Pump K5.1E Pressure Washer Unloader Valve (Part #1494)\u003c\/strong\u003e is a genuine OEM replacement \u003cstrong data-start=\"373\" data-end=\"405\"\u003eflow-actuated unloader valve\u003c\/strong\u003e designed for commercial and industrial pressure washer systems operating between \u003cstrong data-start=\"487\" data-end=\"506\"\u003e3.0 and 4.2 GPM\u003c\/strong\u003e with adjustable pressures from \u003cstrong data-start=\"538\" data-end=\"560\"\u003e1,450 to 3,000 PSI\u003c\/strong\u003e. Manufactured by \u003cstrong data-start=\"578\" data-end=\"594\"\u003eGeneral Pump\u003c\/strong\u003e, the K5.1E utilizes a balanced piston design that delivers precise pressure regulation, smooth bypass operation, and reliable protection for pumps and high-pressure system components.\u003c\/p\u003e\n\u003cp data-start=\"273\" data-end=\"778\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cem\u003eImage shown for illustrative purposes only\u003c\/em\u003e\u003cb id=\"docs-internal-guid-40557729-7fff-4103-1743-94a3a554ca19\"\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003chr data-start=\"1548\" data-end=\"1551\"\u003e\n\u003ch2 data-section-id=\"939trr\" data-start=\"1553\" data-end=\"1579\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul data-start=\"1581\" data-end=\"2159\"\u003e\n\u003cli data-section-id=\"1yufexy\" data-start=\"1581\" data-end=\"1634\"\u003eGenuine General Pump OEM replacement unloader valve\u003c\/li\u003e\n\u003cli data-section-id=\"1f1fr4f\" data-start=\"1635\" data-end=\"1673\"\u003eFlow-actuated balanced piston design\u003c\/li\u003e\n\u003cli data-section-id=\"9xogth\" data-start=\"1674\" data-end=\"1728\"\u003eDesigned for \u003cstrong data-start=\"1689\" data-end=\"1704\"\u003e3.0–4.2 GPM\u003c\/strong\u003e pressure washer systems\u003c\/li\u003e\n\u003cli data-section-id=\"109tiax\" data-start=\"1729\" data-end=\"1781\"\u003eAdjustable pressure range from \u003cstrong data-start=\"1762\" data-end=\"1781\"\u003e1,450–3,000 PSI\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"nh49g\" data-start=\"1782\" data-end=\"1827\"\u003eMaximum operating pressure of \u003cstrong data-start=\"1814\" data-end=\"1827\"\u003e3,000 PSI\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"gnc41p\" data-start=\"1828\" data-end=\"1882\"\u003eBalanced nozzle technology minimizes pressure spikes\u003c\/li\u003e\n\u003cli data-section-id=\"klevii\" data-start=\"1883\" data-end=\"1930\"\u003eStainless steel and brass internal components\u003c\/li\u003e\n\u003cli data-section-id=\"huu8c4\" data-start=\"1931\" data-end=\"1984\"\u003eDual gauge ports for convenient pressure monitoring\u003c\/li\u003e\n\u003cli data-section-id=\"1b5xif7\" data-start=\"1985\" data-end=\"2039\"\u003eSmooth transition between operating and bypass modes\u003c\/li\u003e\n\u003cli data-section-id=\"1sa1x6w\" data-start=\"2040\" data-end=\"2073\"\u003eHelps extend pump and hose life\u003c\/li\u003e\n\u003cli data-section-id=\"71ai47\" data-start=\"2074\" data-end=\"2125\"\u003eHeavy-duty commercial and industrial construction\u003c\/li\u003e\n\u003cli data-section-id=\"3iwt53\" data-start=\"2126\" data-end=\"2159\"\u003eOEM-quality fit and performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2161\" data-end=\"2164\"\u003e\n\u003ch2 data-section-id=\"1cgu054\" data-start=\"2166\" data-end=\"2193\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cp data-start=\"2195\" data-end=\"2216\"\u003e\u003cstrong data-start=\"2195\" data-end=\"2211\"\u003ePart Number:\u003c\/strong\u003e 1494\u003c\/p\u003e\n\u003cp data-start=\"2218\" data-end=\"2248\"\u003e\u003cstrong data-start=\"2218\" data-end=\"2235\"\u003eManufacturer:\u003c\/strong\u003e General Pump\u003c\/p\u003e\n\u003cp data-start=\"2250\" data-end=\"2266\"\u003e\u003cstrong data-start=\"2250\" data-end=\"2260\"\u003eModel:\u003c\/strong\u003e K5.1E\u003c\/p\u003e\n\u003cp data-start=\"2268\" data-end=\"2314\"\u003e\u003cstrong data-start=\"2268\" data-end=\"2285\"\u003eProduct Type:\u003c\/strong\u003e Flow Actuated Unloader Valve\u003c\/p\u003e\n\u003cp data-start=\"2316\" data-end=\"2343\"\u003e\u003cstrong data-start=\"2316\" data-end=\"2331\"\u003eFlow Range:\u003c\/strong\u003e 3.0–4.2 GPM\u003c\/p\u003e\n\u003cp data-start=\"2345\" data-end=\"2379\"\u003e\u003cstrong data-start=\"2345\" data-end=\"2371\"\u003eMaximum Flow Capacity:\u003c\/strong\u003e 4.2 GPM\u003c\/p\u003e\n\u003cp data-start=\"2381\" data-end=\"2427\"\u003e\u003cstrong data-start=\"2381\" data-end=\"2411\"\u003ePressure Adjustment Range:\u003c\/strong\u003e 1,450–3,000 PSI\u003c\/p\u003e\n\u003cp data-start=\"2429\" data-end=\"2460\"\u003e\u003cstrong data-start=\"2429\" data-end=\"2450\"\u003eMaximum Pressure:\u003c\/strong\u003e 3,000 PSI\u003c\/p\u003e\n\u003cp data-start=\"2462\" data-end=\"2492\"\u003e\u003cstrong data-start=\"2462\" data-end=\"2486\"\u003eMaximum Temperature:\u003c\/strong\u003e 195°F\u003c\/p\u003e\n\u003cp data-start=\"2494\" data-end=\"2526\"\u003e\u003cstrong data-start=\"2494\" data-end=\"2515\"\u003eInlet Connection:\u003c\/strong\u003e 3\/8\" BSP-F\u003c\/p\u003e\n\u003cp data-start=\"2528\" data-end=\"2561\"\u003e\u003cstrong data-start=\"2528\" data-end=\"2550\"\u003eOutlet Connection:\u003c\/strong\u003e 3\/8\" BSP-M\u003c\/p\u003e\n\u003cp data-start=\"2563\" data-end=\"2596\"\u003e\u003cstrong data-start=\"2563\" data-end=\"2585\"\u003eBypass Connection:\u003c\/strong\u003e 3\/4\" BSP-M\u003c\/p\u003e\n\u003cp data-start=\"2598\" data-end=\"2619\"\u003e\u003cstrong data-start=\"2598\" data-end=\"2614\"\u003eGauge Ports:\u003c\/strong\u003e Dual\u003c\/p\u003e\n\u003cp data-start=\"2621\" data-end=\"2654\"\u003e\u003cstrong data-start=\"2621\" data-end=\"2640\"\u003eOperation Type:\u003c\/strong\u003e Flow Actuated\u003c\/p\u003e\n\u003cp data-start=\"2656\" data-end=\"2680\"\u003e\u003cstrong data-start=\"2656\" data-end=\"2676\"\u003eOEM Replacement:\u003c\/strong\u003e Yes\u003c\/p\u003e\n\u003chr data-start=\"2682\" data-end=\"2685\"\u003e\n\u003ch2 data-section-id=\"rlaica\" data-start=\"2687\" data-end=\"2709\"\u003eHow the K5.1E Works\u003c\/h2\u003e\n\u003cp data-start=\"2711\" data-end=\"2789\"\u003eThe K5.1E regulates pressure using a balanced piston and flow-actuated design.\u003c\/p\u003e\n\u003cp data-start=\"2791\" data-end=\"2818\"\u003eWhen the spray gun is open:\u003c\/p\u003e\n\u003cul data-start=\"2820\" data-end=\"2981\"\u003e\n\u003cli data-section-id=\"17gvr3w\" data-start=\"2820\" data-end=\"2864\"\u003eWater flows normally through the unloader.\u003c\/li\u003e\n\u003cli data-section-id=\"9te9qv\" data-start=\"2865\" data-end=\"2921\"\u003eThe balanced piston remains in the operating position.\u003c\/li\u003e\n\u003cli data-section-id=\"1o9ynhs\" data-start=\"2922\" data-end=\"2981\"\u003eFull operating pressure is delivered to the spray nozzle.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2983\" data-end=\"3012\"\u003eWhen the spray gun is closed:\u003c\/p\u003e\n\u003cul data-start=\"3014\" data-end=\"3257\"\u003e\n\u003cli data-section-id=\"1hewgq2\" data-start=\"3014\" data-end=\"3033\"\u003eWater flow stops.\u003c\/li\u003e\n\u003cli data-section-id=\"in7h15\" data-start=\"3034\" data-end=\"3086\"\u003ePressure rises downstream of the internal orifice.\u003c\/li\u003e\n\u003cli data-section-id=\"46fur8\" data-start=\"3087\" data-end=\"3130\"\u003eThe balanced piston shifts automatically.\u003c\/li\u003e\n\u003cli data-section-id=\"n7gl8r\" data-start=\"3131\" data-end=\"3178\"\u003eWater is diverted through the bypass circuit.\u003c\/li\u003e\n\u003cli data-section-id=\"1dxjmyr\" data-start=\"3179\" data-end=\"3257\"\u003ePressure spikes are minimized while protecting the pump and plumbing system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3259\" data-end=\"3392\"\u003eThis balanced design provides smoother operation than conventional unloader valves while reducing wear on pressure washer components.\u003c\/p\u003e\n\u003chr data-start=\"3394\" data-end=\"3397\"\u003e\n\u003ch2 data-section-id=\"vx2wyp\" data-start=\"3399\" data-end=\"3421\"\u003eCommon Applications\u003c\/h2\u003e\n\u003ch3 data-section-id=\"1m7fljq\" data-start=\"3423\" data-end=\"3454\"\u003eCommercial Pressure Washers\u003c\/h3\u003e\n\u003cp data-start=\"3456\" data-end=\"3466\"\u003eIdeal for:\u003c\/p\u003e\n\u003cul data-start=\"3468\" data-end=\"3606\"\u003e\n\u003cli data-section-id=\"1mppnl2\" data-start=\"3468\" data-end=\"3502\"\u003eMobile pressure washing trailers\u003c\/li\u003e\n\u003cli data-section-id=\"17a9h0z\" data-start=\"3503\" data-end=\"3538\"\u003eContractor-grade pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"1hb3h7x\" data-start=\"3539\" data-end=\"3562\"\u003eFleet washing systems\u003c\/li\u003e\n\u003cli data-section-id=\"1hcbv4i\" data-start=\"3563\" data-end=\"3585\"\u003eProperty maintenance\u003c\/li\u003e\n\u003cli data-section-id=\"9ezizr\" data-start=\"3586\" data-end=\"3606\"\u003eEquipment cleaning\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"m9dt0u\" data-start=\"3608\" data-end=\"3641\"\u003eIndustrial Cleaning Equipment\u003c\/h3\u003e\n\u003cp data-start=\"3643\" data-end=\"3656\"\u003eSuitable for:\u003c\/p\u003e\n\u003cul data-start=\"3658\" data-end=\"3808\"\u003e\n\u003cli data-section-id=\"1i0u86j\" data-start=\"3658\" data-end=\"3684\"\u003eManufacturing facilities\u003c\/li\u003e\n\u003cli data-section-id=\"9bm7jy\" data-start=\"3685\" data-end=\"3718\"\u003eAgricultural equipment cleaning\u003c\/li\u003e\n\u003cli data-section-id=\"1q52hyj\" data-start=\"3719\" data-end=\"3745\"\u003eIndustrial wash stations\u003c\/li\u003e\n\u003cli data-section-id=\"10tc7t6\" data-start=\"3746\" data-end=\"3781\"\u003eMunicipal maintenance departments\u003c\/li\u003e\n\u003cli data-section-id=\"167zffo\" data-start=\"3782\" data-end=\"3808\"\u003eHeavy equipment cleaning\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1m4yfbj\" data-start=\"3810\" data-end=\"3837\"\u003ePressure Washer Systems\u003c\/h3\u003e\n\u003cp data-start=\"3839\" data-end=\"3855\"\u003eCompatible with:\u003c\/p\u003e\n\u003cul data-start=\"3857\" data-end=\"4021\"\u003e\n\u003cli data-section-id=\"e1w54q\" data-start=\"3857\" data-end=\"3886\"\u003eBelt-drive pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"1d973ig\" data-start=\"3887\" data-end=\"3918\"\u003eDirect-drive pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"g7mqf6\" data-start=\"3919\" data-end=\"3947\"\u003eHot water pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"1l5zndh\" data-start=\"3948\" data-end=\"3977\"\u003eCold water pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"ljit72\" data-start=\"3978\" data-end=\"4021\"\u003eCustom commercial pressure washer systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4023\" data-end=\"4026\"\u003e\n\u003ch2 data-section-id=\"ctfpuh\" data-start=\"4028\" data-end=\"4051\"\u003ePerformance Benefits\u003c\/h2\u003e\n\u003cul data-start=\"4053\" data-end=\"4277\"\u003e\n\u003cli data-section-id=\"13mgugy\" data-start=\"4053\" data-end=\"4082\"\u003ePrecise pressure regulation\u003c\/li\u003e\n\u003cli data-section-id=\"1nzrik5\" data-start=\"4083\" data-end=\"4108\"\u003eSmooth bypass operation\u003c\/li\u003e\n\u003cli data-section-id=\"1ero2xq\" data-start=\"4109\" data-end=\"4134\"\u003eReduced pressure spikes\u003c\/li\u003e\n\u003cli data-section-id=\"1bb2u3x\" data-start=\"4135\" data-end=\"4161\"\u003eImproved pump protection\u003c\/li\u003e\n\u003cli data-section-id=\"1gpagnp\" data-start=\"4162\" data-end=\"4195\"\u003eConsistent cleaning performance\u003c\/li\u003e\n\u003cli data-section-id=\"1kjg8fj\" data-start=\"4196\" data-end=\"4225\"\u003eExtended equipment lifespan\u003c\/li\u003e\n\u003cli data-section-id=\"2ks8i6\" data-start=\"4226\" data-end=\"4251\"\u003eLower maintenance costs\u003c\/li\u003e\n\u003cli data-section-id=\"1n877ue\" data-start=\"4252\" data-end=\"4277\"\u003eReliable OEM durability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4279\" data-end=\"4282\"\u003e\n\u003ch2 data-section-id=\"x2tt67\" data-start=\"4284\" data-end=\"4328\"\u003eSigns an Unloader Valve Needs Replacement\u003c\/h2\u003e\n\u003cp data-start=\"4330\" data-end=\"4376\"\u003eInspect or replace the unloader if you notice:\u003c\/p\u003e\n\u003cul data-start=\"4378\" data-end=\"4579\"\u003e\n\u003cli data-section-id=\"zta6im\" data-start=\"4378\" data-end=\"4401\"\u003ePressure fluctuations\u003c\/li\u003e\n\u003cli data-section-id=\"irubn0\" data-start=\"4402\" data-end=\"4429\"\u003eReduced cleaning pressure\u003c\/li\u003e\n\u003cli data-section-id=\"1g7kb8v\" data-start=\"4430\" data-end=\"4462\"\u003eWater leakage around the valve\u003c\/li\u003e\n\u003cli data-section-id=\"op63ib\" data-start=\"4463\" data-end=\"4494\"\u003eDifficulty adjusting pressure\u003c\/li\u003e\n\u003cli data-section-id=\"1vz4ts\" data-start=\"4495\" data-end=\"4526\"\u003eInconsistent bypass operation\u003c\/li\u003e\n\u003cli data-section-id=\"1n6rxvr\" data-start=\"4527\" data-end=\"4553\"\u003eDelayed trigger response\u003c\/li\u003e\n\u003cli data-section-id=\"16xn7rj\" data-start=\"4554\" data-end=\"4579\"\u003eExcessive internal wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4581\" data-end=\"4584\"\u003e\n\u003ch2 data-section-id=\"16dprsq\" data-start=\"4586\" data-end=\"4607\"\u003eInstallation Notes\u003c\/h2\u003e\n\u003col data-start=\"4609\" data-end=\"5065\"\u003e\n\u003cli data-section-id=\"jswuv9\" data-start=\"4609\" data-end=\"4692\"\u003eVerify compatibility with your pressure washer's flow and pressure requirements.\u003c\/li\u003e\n\u003cli data-section-id=\"obykb\" data-start=\"4693\" data-end=\"4753\"\u003eInstall using the proper BSP fittings and thread sealant.\u003c\/li\u003e\n\u003cli data-section-id=\"1q33z2i\" data-start=\"4754\" data-end=\"4850\"\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=\"4851\" data-end=\"4937\"\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=\"4938\" data-end=\"5002\"\u003eSet the operating pressure using a calibrated pressure gauge.\u003c\/li\u003e\n\u003cli data-section-id=\"fp39ip\" data-start=\"5003\" data-end=\"5065\"\u003eMaintain a \u003cstrong data-start=\"5017\" data-end=\"5043\"\u003eminimum 5% bypass flow\u003c\/strong\u003e for proper operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp data-start=\"5067\" data-end=\"5263\"\u003e\u003cstrong data-start=\"5067\" data-end=\"5081\"\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=\"5265\" data-end=\"5268\"\u003e\n\u003ch2 data-section-id=\"8fimbm\" data-start=\"5270\" data-end=\"5300\"\u003eMaintenance Recommendations\u003c\/h2\u003e\n\u003cul data-start=\"5302\" data-end=\"5629\"\u003e\n\u003cli data-section-id=\"vakiz1\" data-start=\"5302\" data-end=\"5354\"\u003eInspect the unloader regularly for leaks and wear.\u003c\/li\u003e\n\u003cli data-section-id=\"dwtr3i\" data-start=\"5355\" data-end=\"5411\"\u003eVerify pressure settings during scheduled maintenance.\u003c\/li\u003e\n\u003cli data-section-id=\"q3d7yn\" data-start=\"5412\" data-end=\"5448\"\u003eKeep inlet water filtration clean.\u003c\/li\u003e\n\u003cli data-section-id=\"1vqtz4t\" data-start=\"5449\" data-end=\"5496\"\u003eMaintain the recommended minimum bypass flow.\u003c\/li\u003e\n\u003cli data-section-id=\"1fv3cus\" data-start=\"5497\" data-end=\"5572\"\u003eReplace worn seals and internal components using genuine OEM repair kits.\u003c\/li\u003e\n\u003cli data-section-id=\"14cgjbx\" data-start=\"5573\" data-end=\"5629\"\u003eFollow General Pump recommended maintenance intervals.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"General Pump","offers":[{"title":"Default Title","offer_id":53433632293227,"sku":null,"price":140.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/9201\/5723\/files\/K5.0UNLOADER_51b9d87d-7d8e-4b1a-a3ee-0982b759426d.png?v=1782701589","url":"https:\/\/generalsprayers.com\/products\/k5-1e-pressure-washer-unloader-valve-3-0-4-2-gpm-1450-3000-psi-oem-replacement-part","provider":"GeneralSprayers","version":"1.0","type":"link"}