Tyco DV-5A - DV-5 A Valve Operation; Pressure Loss Characteristics; Valve Set and Actuation Process

TFP1450
Page 5 of 28
• Common hardware compression
tting are brass per ASTM B16
• Common hardware tubing is Type L
per ASTM B88
Operation
The TYCO DV-5a Valve is a diaphragm
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-5a Valve is set for service,
the Diaphragm Chamber is pressurized
through the trim connections from the
inlet side of the system’s main control
valve.
Opening of a solenoid valve for Elec-
tric/Electric Actuation (Figure 4) or
opening of a solenoid valve and dry
pilot actuator for Electric/Pneumatic
Actuation (Ref. Figure 5), trips the
Model MRA-1 Manual Reset Actuator.
Tripping the MRA-1 releases water from
the DV-5a Diaphragm Chamber faster
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-5a Diaphragm 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 (Ref. Figure 2B).
Upon opening of the DV-5a Valve, the
Model MRA-1 Manual Reset Actua-
tor opens to constantly vent the DV-5a
Diaphragm Chamber to "hydraulically
latch" the DV-5a in the tripped position
until manually reset.
Refer to the following two sections for
additional information regarding actua-
tion options:
• Electric/Electric Actuation
• Electric/Pneumatic Actuation
6 INCH (DN150)
3 INCH (DN80)
2 INCH (DN50)
4 INCH (DN100)
8 INCH (DN200)
1-1/2 INCH (DN40)
200 400 1000 3000200060010050
50002000 3000 1000070001000600400200
4000
15000
9.0
8.0
4.0
6.0
5.0
7.0
3.0
2.0
1.0
0.7
0.9
0.8
0.5
0.4
0.6
0.3
NOMINAL PRESSURE DROP IN BAR
(1 PSI = 0,06895 BAR)
FLOW RATE IN LITERS PER MINUTE (LPM)
(1 GPM = 3,785 LPM)
NOMINAL PRESSURE DROP IN POUNDS PER SQUARE INCH (PSI)
FLOW RATE IN GALLONS PER MINUTE (GPM)
0,022
0,080
0,030
0,040
0,060
0,050
0,070
0,100
0,090
0,200
0,300
0,400
0,500
0,600
GRAPH A
DV-5a VALVE
NOMINAL PRESSURE LOSS VERSUS FLOW