| 摘要 |
<p>A liquid delivery system is disclosed for use with one or a plurality of individual water blast guns (10), each of which has an auxiliary shut-off valve integral with the gun and also includes electric circuit completion means (46) for operating a pneumatic secondary shut-off valve (14) in series with the high pressure liquid supply conduit feeding each gun. This series arrangement of first and second shut-off valves in the fluid conduit between the pump discharge and each individual gun assures a fail-safe shut-off system which gives the operator of each gun the assurance that upon release of the water blast gun trigger that cessation of the water blast from the gun nozzle will occur. Accordingly, the likelihood of the operator falling over backwards upon release of the gun trigger is eliminated and risk of a dropped runaway water blast gun that failed to shut-off is eliminated.</p> |
