Section 8
High Pressure Water System
20479291
2-2012/Rev 04
8-29
8.14 High Pressure Dump Valve
The high pressure dump valve assembly includes a normally open high pressure water valve and
a solenoid operated air valve. The following procedure is recommended for servicing the high
pressure dump valve. Failure to follow these procedures will cause damage to the stem, valve
seat, or both.
The high pressure dump valve is a safety device designed to instantly release high
pressure from the system. Proper maintenance is imperative to prevent potential
personal injury.
Figure 8-23, Pneumatic Valve Seal Tools, illustrates the special tools recommended for this
procedure.
Figure 8-23: Pneumatic Valve Seal Tools
Pneumatic Control Valve
For reliable operation the valve seat, seal assembly, brass backup ring and stem shall
always be replaced at the same time. The SST backup ring can be reused.
Before proceeding, disconnect and lockout the main power supply and the electrical enclosure;
and ensure that all high pressure water and hydraulic pressure has been bled from the system.
Severe injury can result if the machine is not properly locked out. Observe
electrical Lock Out/Tag Out procedures before proceeding.
Ensure all pressure is relieved or blocked from the hydraulic and high pressure
circuits before proceeding.
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