Operation - Tyco DV-5a Manual

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Operation

The TYCO DV-5 Valve is a diaphragm
a
style valve that depends upon water
pressure in the Diaphragm Chamber
(see Figure 2A) to hold the Diaphragm
closed against the water supply
pressure.
When the DV-5 Valve is set for service,
a
the Diaphragm Chamber is pressurized
through the trim connections from the
inlet side of the system's main control
valve.
FLOW RATE IN LITERS PER MINUTE (LPM)
(1 GPM = 3,785 LPM)
600 1000
200 400
FLOW RATE IN GALLONS PER MINUTE (GPM)
GRAPH A
DV-5
NOMINAL PRESSURE LOSS VERSUS FLOW
Opening of a solenoid valve for Electric/
Electric Actuation (see Figure 4) trips the
Model MRA-1 Manual Reset Actuator.
Tripping the MRA-1 releases water from
the DV-5 Diaphragm Chamber faster
a
than it can be replenished through the
1/8 in. (3,2 mm) restriction located in
the diaphragm chamber supply con-
nection. Release of water through the
MRA-1 results in a rapid pressure drop
in the DV-5 Diaphragm Chamber. The
a
force differential applied through the
Diaphragm to hold the Diaphragm in
the set position is then reduced below
the valve trip point. The water supply
pressure then forces the Diaphragm
open permitting water to flow into
the system piping, as well as through
the Alarm Port to actuate the system
alarms (see Figure 2B).
2000 3000 5000
600 1000
VALVE
a
Upon opening of the DV-5
Model MRA-1 Manual Reset Actua-
tor opens to constantly vent the DV-5
Diaphragm Chamber to "hydraulically
latch" the DV-5
until manually reset.
See Electric/Electric Actuation sub-
section for additional information.
TFP1466
Page 5 of 18
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Valve, the
a
in the tripped position
a
a