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TFP1581
Page 10 of 14
Installation
Note: The valve may be installed in any ori-
entation provided the gauges are readable
from a safe position and the valve can be
adequately inspected in accordance with
NFPA 25.
The TYCO Model PRV-1
Reducing Valve must be installed with
the flow arrow located on the Dia-
phragm Cover pointing in the intended
direction of flow. Installation dimen-
sions are provided in Figures 8 and 9.
Before the Model PRV-1
installed, pipe lines should be flushed
of all chips, scale and foreign matter.
Care must be exercised to assure
that the trim is not damaged during
installation.
NOTICE
Do not lift the valve by its trim. Other-
wise, the trim may be damaged and
impair system operation. The inlet
and outlet connections must be made
based on the direction of flow arrow
provided on the Diaphragm Cover.
The valve cannot operate if connected
backwards.
Do not alter the trim. Altering the trim
voids the approvals listing of the valve
and may impair system performance.
Placing the
Valve in Service
Perform the following steps to place the
TYCO Model PRV-1
Pressure Reduc-
A
ing Valve in service.
WARNING
Downstream pressure adjustment is
only to be performed by experienced
personnel who understand the impact
of adjusting the downstream pressure
and who take full responsibility of the
readjustment from the factory setting.
The Pilot Valve is provided with a
Tamper Cap, which upon removal will
allow for field adjustment by using the
Adjusting Screw.
Per the requirements of NFPA 13, a
means shall be provided downstream
of the Model PRV-1
Valve to simulate
A
the sprinkler system demand. In the
case of hose stations, the opening of a
hose valve or multiple hose valves, as
required, will be necessary to simulate
hose stream demand.
For the purposes of the following
instruction, the opening of a "flow
test valve" simulates either the sprin-
kler demand or hose stream demand,
as applicable. The sprinkler demand
or hose stream demand must be
at least 50 gpm (190 Lpm) for 2 to
6 in. (DN50 to DN150) valves and
at least 100 gpm (380 Lpm) for 8 in.
(DN200) valves.
There is no need to vent any trapped air
from the Diaphragm Chamber.
Filling the System
Pressure
A
Step 1. Verify that the downstream
drain valves are closed and that there
are no leaks.
Step 2. Partially open a valve or valves
at the end of the system, such as an
inspector's test connection on a wet
Valve is
A
pipe system, to allow trapped air to
escape when filling the system.
Step 3. Slowly and partially open the
water supply control valve feeding the
Model PRV-1
Step 4. After the system fills with water,
close the valve or valves that had been
partially opened in Step 2.
Step 5. Completely open the main
water supply control valve feeding the
Model PRV-1
Adjusting Downstream Pressure
NOTICE
After any downstream pressure adjust-
ment, the following items are to be
recorded on a tag attached to the valve:
•
Valve installation location
•
Inlet static pressure
•
Outlet static pressure
•
Inlet residual pressure
•
Outlet residual pressure
•
Intended outlet flow
The tag is not to be removed until after
the system has been accepted by the
authority having jurisdiction. It is rec-
ommended that the tag not be removed
even after acceptance by the author-
ity having jurisdiction unless another
means of record keeping is maintained.
Step 1. Remove the Tamper Cap from
the Pilot Valve by first loosening its set
screw and then unscrewing the Tamper
Cap.
Step 2. Open the "flow test valve" to
simulate either the desired sprinkler
demand or hose stream demand.
Step 3. If surging flow occurs, attempt
to bleed trapped air from the system via
the inspector's test valve and any other
valve that can vent trapped air.
Step 4. Loosen the locknut on the
adjusting screw of the Pilot Valve.
Step 5. Turn the adjusting screw clock-
wise to increase outlet pressure or
counterclockwise to decrease outlet
pressure.
Valve.
A
Valve.
A
Step 6. After achieving the desired per-
formance, tighten the locknut on the
adjusting screw.
Step 7. Slowly reduce the flow through
the valve by closing the "flow test valve"
over the course of at least 30 seconds.
Observe the outlet pressure gauge and
compare to the required "set pressure".
If the required "set pressure" is not
achieved, repeat Step 2 and proceed
accordingly. Replace the Tamper Cap
and tighten its set screw.
NOTICE
After setting the PRV-1
A
record the installation location, static
pressure at the inlet, residual pressure
at the inlet, static pressure at the outlet,
intended flow at the outlet, and residual
pressure at the outlet on the paper field
tag included with the valve trim. Attach
the tag to the front of the valve.
WARNING
If the "flow test valve" is closed rapidly
it can cause a spike in downstream
pressure.
The pressure reducing valve is now set
for service.
Due to the spring tolerance within the
Pilot Valve, it may be necessary to
alternate back and forth between resid-
ual and static conditions to achieve the
desired "set pressure" for both residual
and static conditions.
Care and
Maintenance
The TYCO Model PRV-1
Reducing Valve must be maintained
and serviced in accordance with this
section. Before closing a fire protec-
tion system main control valve for
maintenance work on the fire protec-
tion system that it controls, obtain
permission to shut down the affected
fire protection system from the proper
authorities and notify all personnel who
may be affected by this action.
NOTICE
Inspection, testing, and maintenance
must be performed in accordance
with the requirements of the NFPA, and
any impairment must be immediately
corrected.
Responsibility lies with sprinkler owners
for the inspection, testing, and mainte-
nance of their fire protection system
and devices in compliance with this
document, as well as with the applica-
ble standards of the NFPA for example,
NFPA 25, in addition to the standards
for service,
Pressure
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