Operation - Tyco DV-5A Manual

TFP1421
Page 6 of 18
SYSTEM PIPING WITH AUTOMATIC SPRINKLERS - NORMALLY DRY
HEAT DETECTORS, SMOKE DETECTORS,
DELUGE VALVE
RELEASING PANEL
(AUTOMATIC
CONTROL UNIT
WITH BATTERY
BACK-UP)
POWER
AUTOMATIC
SUPPLY
SUPERVISORY
(TYPICALLY
AIR/NITROGEN
120 VOLTS AC)
8 TO 12 PSI
SUPERVISORY
LOW PRESSURE
ALARM SWITCH
DIAPHRAGM
CHAMBER SUPPLY
SYSTEM AIR
PRESSURE CONTROL VALVE
(NORMALLY OPEN)
GAUGE
DV-5 VALVE - SINGLE INTERLOCK PREACTION ELECTRIC ACTUATION SCHEMATIC DIAGRAM
a

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.
Opening the Electric Actuation Trim
trips the Model MRA-1 Manual Reset
Actuator. Tripping the MRA-1 releases
water from the DV-5
a
Chamber faster than it can be replen-
ished through a 1/8 in. (3,2 mm) restric-
tion located in the Diaphragm Chamber
Supply Connection. Release of water
through the MRA-1 results in a rapid
pressure drop in the DV-5
Chamber. The 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).
ELECTRIC DETECTION SYSTEM
(TYPICALLY 24 VOLTS DC)
MANUAL PULL STATIONS, ETC.
SUPPLY
DIAPHRAGM CHAMBER
PRESSURE GAUGE
RESTRICTION
MANUAL RESET
WATER SUPPLY SHUT-OFF
(NORMALLY OPEN)
Upon opening of the DV-5
Model MRA-1 Manual Reset Actuator
opens to constantly vent the DV-5
phragm Chamber to hydraulically latch
the DV-5
manually reset.
In standby mode, the integrity of the
system piping is supervised by a low
pressure alarm switch.
See the Electric Actuation section for
additional information.
Electric
Actuation
The Electric Actuation Trim forms a part
Diaphragm
of the laboratory approval of the DV-5
Valves and is necessary for their proper
operation.
The Electric Actuation Trim is required
for electric operation of the DV-5
Diaphragm
by a detection system consisting of
a
electrical devices such as heat sen-
sitive thermostats, smoke detectors,
and/or electric manual pull stations as
shown in Figure 4.
Note: For Single Interlock Preaction
Systems with Electric Actuation, the system
designer typically selects electric detection
devices that will operate sooner than the
automatic sprinklers chosen for use on the
WATERFLOW
DV-5A
PRESSURE
VALVE
ALARM
SWITCH
DRAIN
WATER SUPPLY
PRESSURE
ACTUATOR
GAUGE
DIAPHRAGM CHAMBER
SUPPLY CONNECTION
FIGURE 4
Valve, the
a
Dia-
a
in the tripped position until
a
Valve
a
SOLENOID
(TYPICALLY
24 VOLTS DC)
SYSTEM DRAIN VALVE
DRAIN
(NORMALLY CLOSED)
DRAIN
DRAIN
CONTROL
MAIN
CONTROL VALVE
(NORMALLY
WATER
OPEN)
SUPPLY
sprinkler piping.
Dimensions are provided in Figure 7.
Notes:
The normally closed, de-energized,
Solenoid Valve is separately ordered and
selected based on the required laboratory
approval acceptable to the authority having
jurisdiction. Refer to Technical Data Sheet
TFP2180 for specific laboratory approvals.
Consult with the applicable standards of
the Approval agency regarding installation
criteria pertaining to electric actuation
circuitry.
Due to the functionality of the Model
MRA-1 Manual Reset Actuator, the
release circuit of the releasing panel
need only provide the typical ten
a
minutes of alarm condition intended
to energize the Solenoid Valve to
open. After the ten minute duration, at
which point should the Solenoid Valve
become de-energized and close (espe-
cially while operating under battery
back-up), the MRA-1 will have already
automatically opened, thereby pre-
venting the DV-5 Diaphragm Chamber
a
from becoming re-pressurized, and
preventing an inadvertent closing of
the DV-5 during a fire event.
a
VALVE
MAIN
DRAIN VALVE
(NORMALLY
CLOSED)
LOCAL
MANUAL
DRAIN
STATION