Section 9
High Pressure Water System
20412997
8-2012/Rev 12
9-32
9.15 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 SL-V 30, 50 and 60 are equipped with a round, three port
dump valve assembly. A square, two port dump valve assembly is installed on SL-V 100. The
following procedures are recommended for servicing each 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 9-23, Pneumatic Valve Seal Tools, illustrates the special tools recommended for this
procedure.
Figure 9-23: Pneumatic Valve Seal Tools
3-Port Pneumatic Control Dump Valve (SL-V 30, 50 and 60)
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.
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