15PI-121January 2020
2) CONSTANT PRESSURE MODE:
For multiple gun operation where system pressure must remain con-
stant. This is achieved by installing a properly-sized orifice in the diffuser
tube. Releasing gun trigger causes valve to shift from blast gun to fixed
orifice, maintaining system pressure. Orifice must be sized using the
nozzle selection chart so that its flow is equivalent to the total flow of all
the blast nozzles in the attached gun.
When operating in Constant Pressure Mode, it is abso-
lutely necessary to have the diffuser, diffuser tube, and elbow installed
over the nozzle to contain the dangerous waterjet, which exits the fixed
orifice.
Use the Nozzle Selection Chart under the Flow Chart Section to select
a nozzle for constant pressure mode operation. Chart assumes that all
blast nozzle orifices are the same diameter. If this is not the case for a
particular operation, the nozzle must be sized by determining the total
flow of all nozzles used in the blast gun and then selecting a single
nozzle with an equivalent flow to be installed in the mode configuration
port.
3) fSHUT-IN (DRY SHUTOFF) MODE:
For single or multiple gun systems which utilize intensifier or Flow type
pumps where stopping water flow is desired. This mode is selected by
installing a plug (UHPX-PLUG) in place of the orifice in the diffuser tube.
Releasing gun trigger causes valve to shift from blast gun to plugged
diffuser port, stopping water flow.
Never plug the mode configuration port of the Multi-Mode
Valve when using a plunger pump unless an approved pressure regula-
tion device is installed to prevent the system from exceeding the maxi-
mum operating pressure.
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