The K7 unloader is a flow-actuated bypass valve that protects triplex pressure washer pumps running 6.6 to 10.8 GPM. When you let off the trigger, it diverts flow instead of trapping pressure, so there's no spike hitting your hose, fittings, or pump. Key Features Flow-actuated soft start: Pressure builds as flow ramps, so there's no kick when you pull the trigger. Easier on your hands off a ladder and easier on the rig. Balanced piston, no external springs: Fewer wear points than a spring-loaded unloader, and you rebuild it with a kit instead of replacing the whole valve. Sized by flow, not pressure: The .3 orifice covers 6.6 to 10.8 GPM. Match the orifice to your pump's flow and it holds steady. Zero-pressure bypass: Dumps line pressure when you're off the trigger, so the hose goes limp and drags easy between passes. Brass and stainless internals: Built to hold up to hard use on gas triplex rigs. Genuine Interpump OEM, made in Italy: The real General Pump K7, not a generic clone. Specifications Type Flow-actuated (flow-sensitive) unloader Flow range (K7.3) 6.6 to 10.8 GPM Ports 3/8" FPT inlet, 3/8" MPT outlet, 3/8" FPT bypass Internals Brass and stainless steel Max temperature 165°F Weight 4.5 lb Rebuild kit Interpump Kit 70 Origin Made in Italy (Interpump / General Pump) What's Included One K7.3 flow-actuated unloader valve Pre-installed bypass orifice The adjusting knob is optional and isn't included. The base valve sets by nut-and-bolt at the piston, and it ships unset, so you dial it in on the machine with a gauge. It fits triplex and plunger pumps inside the 6.6 to 10.8 GPM band. Operators run it on General Pump, Comet, and AR belt-drive units, including Honda GX690 and GX800 rigs pushing around 8 GPM. It's a single-operator, non-weep valve. It's not for weep guns, multi-gun setups, or hose runs past about 100 feet. If you run a weep gun or two guns off one machine, look at a pressure-actuated valve like the VRT3 unloader instead. How It Works The K7 mounts on the discharge line. With the trigger open, water passes straight through. Release it and the piston shifts, sending flow to the bypass port and dropping line pressure to near zero. Because it reads flow instead of pressure, there's a short ramp when you pull the trigger. That's the soft start. Set the valve on the machine with a gauge fitted at the unloader. The K7 is a pump-side part. In a normal downstream setup, SH draws in through the injector after the pump and unloader, so the valve only ever sees fresh water. Keep it that way. Don't run SH mix through the K7. The brass internals corrode. Flush fresh water through the pump, hoses, gun, and valves after every job. Pairs Well With 4000 PSI @ 8 GPM Belt Drive Pressure Washer Soft Wash Pressure Gauge ST1500 Pressure Washer Gun Chemical Injector Frequently Asked Questions What is a flow-actuated unloader, and how is it different from a pressure unloader? A flow-actuated unloader reads water flow, not trapped pressure. When you release the trigger, it diverts flow to bypass and drops line pressure to near zero, then ramps back up when you pull again. That soft start is easier on the pump and fittings than a pressure unloader's kick. The trade-off is you can't nozzle-tune it. Downsizing the tip only kills pressure after the orifice instead of raising it. Can I use a weep gun with the K7 unloader? No. A weep gun leaks by design, and that constant leak-through makes a flow unloader cycle nonstop. The K7 is built for single-operator, non-weep setups. If you run a weep gun or feed two guns off one machine, use a pressure-actuated unloader like the VRT3 instead. Can I run SH or bleach mix through the K7? No. The K7 is a discharge-side pump-protection valve, and its brass internals corrode with sodium hypochlorite. Run SH downstream through a chemical injector that draws after the pump and unloader, so the valve only handles fresh water. Flush the whole system with fresh water after every job.
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