Valves 3.10
Main valve
The main valve is used for isolating the high-pressure pump system
from the rest of pipe system during service and maintenance.
Test valve
The test valve is used for the following operations and pump start procedures during maintenance
and service:
Relieving pressure on the high-pressure manifold
during maintenance and service operations
Test of pilot pump start and stop when pressure falls
High-pressure pump start when pressure falls, by 6 bar
pressure transmitter, by simulating system pressure
drop when the main valve is in the closed position
High-pressure start on falling pressure, 6 bar pressure
switch (back-up start) by simulating system pressure
drop when the main valve is in the closed position
Relieve pressure during manual start of high-pressure
pump(s)
Pressure controlling and monitoring devices 3.11
Pressure relief valve
The purpose of the pressure relief valve is to maintain the
system pressure at the desired pressure level at any given
discharge and to avoid over pressurization. It is done by
relieving surplus pumping capacity back to the unit tank and
thereby keeping the system pressure constant at the pre-set
level.
The standard SEM-SAFE
®
High-Pressure Water Mist Pump
Unit is provided with one pressure relief valve installed in each
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