Operating Principles - Tyco DV-1 Manual

TFP1330
PUSH ROD
LOCKS LATCH ON
CLAPPER
P1
1/2" NPT
DIAPHRAGM
CHAMBER
SUPPLY
PORT
DIAPHRAGM
CHAMBER
(PRESSURIZED
FROM WATER
SUPPLY)
P3
1/2" NPT ALARM
PORT OPEN TO
ATMOSPHERE
THROUGH
AUTOMATIC
DRAIN VALVE
LATCH PREVENTS
CLAPPER FROM
RESEATING
DIAPHRAGM
CHAMBER
OPEN TO
ATMOSPHERE
PUSH ROD
ASSEMBLY
SLIDES FREELY
THROUGH
DIAPHRAGM
RETAINER
RESET
PLUNGER
ASSEMBLY
Operating
Principles
The Model DV-1 Deluge Valve is a
differential latch type valve which de-
pends upon water pressure in the Dia-
phragm Chamber (Ref. Figure 11A) to
hold the Clapper closed against the
water supply pressure. The nominal
trip ratio is 2.5 to 1, i.e., the DV-1 Valve
operates (opens) when the pressure in
the Diaphragm Chamber is reduced to
approximately 40 percent of the water
supply pressure.
When the DV-1 Valve is set for service,
the Diaphragm Chamber is pressur-
SYSTEM OPEN TO
ATMOSPHERE
WATERWAY
CLOSED BY
LATCHED
CLAPPER
WATER
SUPPLY
FIGURE 11A
SET POSITION
DRAIN
FROM SYSTEM
CLAPPER
LATCHED
OPEN
WATER SUPPLY
SHUT OFF
FIGURE 11C
SYSTEM DRAIN POSITION
4 and 6 INCH (DN100 and DN150) MODEL DV-1 DELUGE VALVE
— SET AND OPEN POSITIONS —
ized through the trim connections from
the inlet side of the system's main con-
trol valve, for example an O.S.&Y. gate
valve or butterfly valve (Ref. Figure 4,
7, and 10). Opening of an actuation
device, for example the solenoid valve
in the Electric Actuation Trim (Ref. Fig.
10), releases water from the Dia-
phragm Chamber faster than it can be
replenished through the 1/8 inch
(3,2mm) Restriction in the Diaphragm
Chamber Supply Connection. This re-
sults in a rapid pressure drop in the
Diaphragm Chamber and the force dif-
ferential applied through the Clapper
Latch to hold the Clapper down in the
set position is reduced to below the
valve trip point. The water supply pres-
PUSH ROD
RELEASES
DIAPHRAGM
LATCH
CHAMBER
OPENED TO
ATMOSPHERE
THROUGH
ACTUATION
TRIM
P2
1/2" NPT
WATER SUPPLY
PRESSURE &
ALARM TEST
PORT
ALARM PORT
WATERFLOW TO
ALARM DEVICE
(AUTOMATIC
DRAIN VALVE
CLOSES)
LATCH
RELEASES
CLAPPER
DIAPHRAGM
CHAMBER
OPEN TO
ATMOSPHERE
PUSH
RESET
PLUNGER
TO ALLOW
CLAPPER TO
RESEAT
P4
2" NPT
MAIN DRAIN
PORT
FIGURE 11
Page 15 of 20
WATERFLOW
TO SYSTEM
CLAPPER
ALLOWED
TO FULLY
OPEN
WATERFLOW FROM
WATER SUPPLY
FIGURE 11B
OPERATED POSITION
SYSTEM DRAIN
COMPLETE
UNLATCHED
CLAPPER
RESEATS
WATER SUPPLY
SHUT OFF
FIGURE 11D
RESETTING VALVE
sure then forces the Clapper open per-
mitting water to flow into the system
piping, as well as through the Alarm
Port to actuate the system alarms
(Ref. Figure 11B).
When the system main control valve is
closed to stop waterflow into the sys-
tem, the Clapper will be prevented
from resetting by the Clapper Latch
until the Rest Knob is pushed inward
(Ref. Figures 11C and 11D). Pushing
the Reset Knob inward will temporarily
reposition the Clapper Latch away
from the waterway and allows the
Clapper to drop into the seated posi-
tion.