Operation - Tyco DV-5A Manual

SYSTEM PIPING WITH OPEN NOZZLES OR SPRINKLERS - NORMALLY DRY
HEAT DETECTORS, SMOKE DETECTORS,
DELUGE VALVE
RELEASING PANEL
(AUTOMATIC
CONTROL UNIT
WITH BATTERY
BACK-UP)
POWER
SUPPLY
(TYPICALLY
120 VOLTS AC)
DIAPHRAGM
CHAMBER SUPPLY
CONTROL VALVE
(NORMALLY OPEN)
REMOTE-RESETTING, PRESSURE-REDUCING SCHEMATIC DIAGRAM

Operation

The TYCO DV-5 Valve is a diaphragm
a
style valve that depends upon water
pressure in the Diaphragm Chamber
(Ref. Figure 2A) to hold the Diaphragm
closed against the water supply
pressure.
When the DV-5 Valve with Remote-
A
Resetting, Pressure-Reducing Trim
is set for service, the Diaphragm
Chamber is pressurized through the
trim connections from the inlet side of
the system's main control valve.
With reference to Figure 4, initial acti-
vation of the Solenoid Valve due to
electrical detection or activation of the
electrical manual pull station results in
the latched opening of the Solenoid
ELECTRIC DETECTION SYSTEM
(TYPICALLY 24 VOLTS DC)
MANUAL PULL STATIONS, ETC.
WATERFLOW
PRESSURE
SWITCH
DIAPHRAGM CHAMBER
PRESSURE GAUGE
RESTRICTION
WATER SUPPLY SHUT-OFF
(NORMALLY OPEN)
DV-5
Valve. Opening of the Solenoid Valve
in the Remote-Resetting, Pressure-
Reducing Trim releases water from the
Diaphragm Chamber faster than it can
be replenished through the Restriction
in the Diaphragm Chamber Supply
Connection provided in the trim. This
release results in a rapid pressure
drop in the Diaphragm Chamber, and
the force differential applied through
the Diaphragm that holds it in the set
position is 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
system alarms.
DV-5A
VALVE
ALARM
PILOT
WATER SUPPLY
VALVE
PRESSURE
GAUGE
DIAPHRAGM CHAMBER
SUPPLY CONNECTION
FIGURE 4
VALVE
a
Page 5 of 22
SOLENOID
VALVE
(TYPICALLY
24 VOLTS DC)
SYSTEM DRAIN VALVE
(NORMALLY CLOSED)
MAIN
DRAIN VALVE
(NORMALLY
DRAIN
CLOSED)
LOCAL
MANUAL
DRAIN
CONTROL
STATION
MAIN
CONTROL VALVE
(NORMALLY
WATER
OPEN)
SUPPLY
To remotely reset the DV-5
voltage to the Solenoid Valve must be
transferred to the appropriate terminals
of the Solenoid Valve (Ref. Figure 5)
resulting in the latched closure of the
Solenoid Valve. Closing of the Sole-
noid Valve in the Remote-Resetting,
Pressure-Reducing Trim permits the
Diaphragm Chamber to repressurize.
This repressurizing results in a pressure
increase in the Diaphragm Chamber.
The resulting force repressurizes the
Diaphragm Chamber, closing the valve
and stopping the flow of water into the
system piping.
TFP1326
Valve, the
a