18 PI-121 January 2020
3.17 All frame components should be tight.
3.18 Inlet and outlet connection fittings should be rated for 40,000 psi.
3.19 Inlet and outlet connection fittings should be tight and in good
condition.
3.20 The control valve body should be tight on control valve base.
3.21 If intending to operate in Constant Pressure Mode, unscrew the
diffuser housing and remove the diffuser. Inspect the hole through the
diffuser center with a flashlight. If there appears to be significant wear
inside, replace it before beginning operation. This component will eventu-
ally wear out, and it should be replaced after every two hundred hours of
operation. If it is allowed to wear excessively, the waterjet exiting though
the fixed nozzle may wear a hole through the end of the diffuser, leaving
the low pressure elbow exposed to the waterjet. If this occurs, the valve’s
waterjet will quickly cut through the elbow on the dump port, exposing
the operators to a dangerous waterjet.
When operating in Constant Pressure Mode, the diffuser
must be replaced after 200 hours of operation to prevent component
failure, which would result in waterblast operators being exposed to a
dangerous waterjet from the dump port.
3.23 For operator safety, all high pressure hose sections connected to
the gun and 40K Multi-Mode Valve should be in good condition and free
of leaks and cover damage.
3.24 Drain hoses connected to the 40K Multi-Mode Valve dump port
should have a minimum of 3/4” inner diameter and should be no longer
than 25 feet. The hose should be free of blockages that can create
dangerously high pressures in diffuser housing, which could result in
component failure.
Never plug the low pressure elbow located on the dump
port of the Multi-Mode Valve, even when operating in Shut-In Mode. This
can result in component failure and/or possible operator injury.
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