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

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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
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.
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
• Common hardware compression
fittings are brass per ASTM B16.
• Common hardware tubing is Type L
copper per ASTM B88.

Operation

The TYCO DV-5
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 Wet Pilot Actuation trips
the Model MRA-1 Manual Reset Actua-
tor. Tripping the MRA-1 releases water
from the DV-5 Diaphragm Chamber
a
faster than it can be replenished
through a 1/8 in. (3,2 mm) restriction
located in the Diaphragm Chamber
2000 3000 5000
600 1000
VALVE
a
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
Valve is a diaphragm
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).
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 Wet Pilot Actuation section for
additional information.
TFP1411
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Diaphragm
a
Valve, the
a
in the tripped position until
a
Dia-
a