A valve assembly having a valve body, a middle body and an adapter block secured to each other. Fluid enters thorugh an inlet tube and in a normal operating condition is discharged through an outlet tube. To relieve the pressure within the valve assembly, a dump tube is opened. A dump valve seat is mounted within the valve body. A valve plunger is mounted within a plunger shoulder cavity within the valve body and/or the middle body. The valve plunger mates with the dump valve seat. A compression spring is used to urge the valve plunger into either a seated position or an unseated position. A dump valve stem is axially displaced into and out of a seated position within a plunger through hole of the valve plunger.

A high pressure water gun for washing electrical insulators and other related articles, which gun has a barrel, a water inlet, a water outlet (nozzle), a pistol grip and a main body portion, which portion communicates with both the inlet and with a lower valve chamber separated from an upper piston chamber. A piston is vertically slidably mounted in the upper chamber. A check valve is slidably mounted horizontally in the lower chamber and is spring biased, when the gun is in the inoperative position. A port extends between the lower chamber and communicates with the upper chamber. Another port in the lower chamber communicates with the barrel. Water introduced into the inlet follows a dual path and ejects out of the nozzle with relatively little pull required on the trigger.

A flow control valve for instant on-off operations with gases or liquids at relatively high pressures, such as pressures between 10,000 psi and 100,000 psi. The valve includes a valve body having two or more valve cavities in communication with each other and defined by two end seal assemblies and one or more valve port seal assemblies. An elongated, round, sliding valve stem is centrally located through the seal assemblies. End plugs are used to support the end seal assemblies. The valve stem has fluid passages which are preferably machined at a mid-section of the valve stem. The valve stem is slid parallel to its longitudinal axis to allow or prevent communication between the valve cavities by way of the fluid passage of the valve stem. Two opposite ends of the valve stem are either not exposed to the working fluid or are exposed to different pressures of the working fluid. With both opposite ends of the valve stem not being exposed to the working fluid, fluid-induced forces of relatively high magnitude are not exerted on the valve stem.

A pressure valve having a fluid inlet, a first chamber, a throughbore, a second chamber, a fluid outlet and a valve stem. The valve stem is mounted within a valve body and has several different diameters. A pressure condition within one or more of the chambers acts upon the valve stem to urge the stem into either an open position or a closed position, depending upon the design of the valve. The valve is particularly suitable for bypass valves, pressure regulating valves, over-pressure protection valves, lost-pressure protection valves, and other pressure-sensitive valve applications.

A method and apparatus for generating a high-pressure fluid jet which preferably draws a material, such as an additive, into the fluid jet. A working pressure of the fluid is increased to generate a high-pressure fluid. The high-pressure fluid is stored within a high-pressure chamber of an accumulator. The stored high-pressure fluid is discharged through a discharge port of the accumulator. The pressure of the high-pressure fluid within the high-pressure chamber is maintained by decreasing the volume of the high-pressure gas chamber as the fluid passes through the discharge port. The high-pressure fluid is then transported into an injection nozzle for forming a high-pressure fluid jet. Within the injection nozzle, a material is combined with the high-pressure fluid jet. The combined fluid and material jet is then discharged from the injection nozzle.