Materials Of Construction; Operation - Johnson Controls tyco DV-5A Series Manual

200 400
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
50 100
will be exposed. Introduction of mois-
ture into the system piping can create
ice build-up that could prevent proper
operation of the system.
The Supervisory Low Pressure Switch
(Item T - Figs. 16, 17, 18) is factory set at
5 ± 1 psi (0,34 ± 0,07 bar) on decreas-
ing pressure. The Pressure Relief Valve
(Item S- Figs. 16, 17, 18) is factory set to
fully open at 25 ± 2 psi (1,72 ± 0,14 bar)
and it begins to crack open at a pres-
sure of about 18 psi (1,24 bar).
Materials of
Construction
Valve Body
Epoxy coated ductile iron per ASTM
A536-77, Grade 65-45-12
Diaphragm Cover
Epoxy coated ductile iron per ASTM
A536-77, Grade 65-45-12
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
Diaphragm
Polyester fabric reinforced, TEFLON
coated, EPDM rubber per ASTM D2000
Diaphragm Cover Fasteners
Aluminum zinc coated steel
Common Hardware Trim
• Common hardware pipe fittings are
galvanized or black as required and
are malleable per ASME B16.3.
• Common hardware pipe nipples are
galvanized or black as required and
are Schedule 40 per ASTM A53 or
A135.
• Common hardware compression
fittings are brass per ASTM B16.
• Common hardware tubing is Type L
copper per ASTM B88.
2000 3000 5000
600 1000
VALVE
a

Operation

The TYCO DV-5
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
the Diaphragm Chamber is pressurized
through the trim connections from the
inlet side of the system's main control
valve.
Opening an actuation device, for
example the solenoid valve in the Elec-
tric Actuation Trim (Ref. Figure 6), trips
the Model MRA-1 Manual Reset Actua-
tor. Tripping the MRA-1 releases water
from the DV-5
faster than it can be replenished
through a 1/8 in. (3,2 mm) restriction
located in the Diaphragm Chamber
Supply Connection. Release of water
through the MRA-1 results in a rapid
pressure drop in the DV-5
TFP1425
Page 5 of 34
7000 10000 15000
0,600
0,500
0,400
0,300
0,200
0,100
0,090
0,080
0,070
0,060
0,050
0,040
0,030
0,022
2000 3000 4000
Valve is a diaphragm
a
Valve is set for service,
a
Diaphragm Chamber
a
Diaphragm
a