Weep pressure washer trigger guns allow a small amount of water to continue flowing at all times. The primary goal of this “weeping” action is to prevent spray guns and high pressure hoses from freezing in cold weather. These spray guns are very common in car wash, truck wash, and other wash bay environments in northern climates.
Weep trigger guns also increase the amount of time a pump can safely be left in bypass. When the trigger on a pressure washer gun is released, the unloader valve begins to bypass water. On many pressure washers, the bypass loop returns directly to the pump inlet, so the pump now begins to recirculate a relatively small amount of water. This water will quickly become hot as it also acts as the primary coolant for the pump, and could lead to overheating
and melting of the seals and valves in the pump manifold. By letting a small stream of water continue to escape from the system, a weep trigger gun allows colder supply water to enter the pump and help offset the temperature rise. This will likely NOT prevent overheating completely, but will buy the pump some extra time.
A third benefit of weep pressure washer guns is less initial pressure kick when the trigger is pulled. Since a small amount of water is already escaping the nozzle, less pressure is trapped in the hose, waiting to be released by the trigger. (This is true when a trapped pressure unloader
is present on the machine.)
Pressure-Washer-Parts.com stocks popular weep trigger gun models from Giant Industries, Mecline, and Suttner. If you are searching for a specific weep gun not listed here, please contact us