Control apparatus for high-pressure water system

Claim 2

Control apparatus for a high-pressure fluid system having a fluid pump driven by an engine and wherein the pump supplies liquid under high pressure through a flow line to a nozzle at a location remote from the pump, comprising: a. an actuating assembly mounted separately from said flow line and operable by a differential in gas pressure acting thereon; b. means connecting said actuating assembly to a throttle for the engine for controlling the speed of the engine; c. gas pressure communication means establishing communication between the exhaust manifold of the engine and said actuating assembly for creating a gas pressure differential in said actuating assembly; and d. valve means included in said fluid pressure communication means for opening and closing communication between the exhaust manifold and said actuating assembly.

Claim 3

The apparatus set forth in claim 1, wherein: a. said actuating assembly includes a housing separated into two chambers by a flexible diaphragm; and b. said means connecting said actuating assembly to a throttle includes a linkage operably connected to said flexible diaphragm and the throttle.

Claim 4

The apparatus set forth in claim 1, including: a. electrical solenoid means operably connected to said valve means for opening and closing same; and b. an electrical circuit including said solenoid means and having a switch and an electrical energy source for supplying electrical energy for operating said solenoid means upon a closing of said switch.

Claim 5

The apparatus set forth in claim 1, wherein: a. said actuating assembly includes a housing separated into two chambers by a flexible diaphragm; and b. said means connecting said actuating assembly to a throttle includes a linkage operably connected to said flexible diaphragm and the throttle; said linkage being adjustable to regulate the extent of movement of the throttle to thereby adjust the pressure of the fluid discharged at the nozzle.

Claim 6

The structure set forth in claim 1, including: means for communicating said actuating assembly with atmospheric pressure when said valve means has closed communication between the exhaust manifold and said actuating assembly for instantaneously shifting the throttle to its low speed.

Claim 7

The apparatus set forth in claim 1, including: a. electrical solenoid means operably connected to said valve means for opening and closing same; b. an electrical circuit including said solenoid means and having a switch and an electrical energy source for supplying electrical energy for operating said solenoid means upon a closing of said switch; c. said actuating assembly including a housing separated into the two chambers by a flexible diaphragm; and d. said means connecting said actuating assembly to a throttle including a linkage operably connected to said flexible diaphragm and the throttle.

Claim 8

The apparatus set forth in claim 1, including: a. electrical solenoid means operably connected to said valve means for opening and closing same; b. an electrical circuit including said solenoid means and having a switch and an electrical energy source for supplying electrical energy for operating said solenoid means upon a closing of said switch; c. said actuating assembly including a housing separated into the two chambers by a flexible diaphragm; d. said means connecting said actuating assembly to a throttle including a linkage operably connected to said flexible diaphragm and the throttle; and e. said valve means establishing communication between the exhaust manifold and one of the chambers in said actuating assembly to create a reduced pressure on one side of said diaphragm as compared to the pressure on the other side thereof for thereby effecting a movement of said linkage to move said throttle to its high speed.

Claim 9

The apparatus set forth in claim 1, including: a. electrical solenoid means operably connected to said valve means for opening and closing same; b. an electrical circuit including said solenoid means and having a switch and an electrical energy source for supplying electrical energy for operating said solenoid means upon a closing of said switch; c. said actuating assembly including a housing separated into the two chambers by a flexible diaphragm; d. said means connecting said actuating assembly to a throttle including a linkage operably connected to said flexible diaphragm and the throttle; e. said valve means establishing communication between the exhaust manifold and one of the chambers in said actuating assembly to create a reduced pressure on one side of said diaphragm as compared to the pressure on the other side thereof for thereby effecting a movement of said linkage to move said throttle to its high speed; and f. said valve means also including means for closing communication between the exhaust manifold and said one of the chambers and establishing communication with atmosphere to substantially equalize the pressure on each side of the diaphragm for thereby moving the linkage to return the throttle to its low speed.

Claim 10

The apparatus set forth in claim 1, including: a. electrical solenoid means operably connected to said valve means for opening and closing same; b. an electrical circuit including said solenoid Means and having a switch and an electrical energy source for supplying electrical energy for operating said solenoid means upon a closing of said switch; and c. said switch being disposed on the nozzle and having means for automatically opening same upon a release of the switch by an operator to thereby open said electrical circuit and effect a return of the throttle to its low speed.