Apollo Valves 36H Series Краткое руководство по эксплуатации
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INSTALLATION
The APOLLO PRH must be installed in a conveniently accessible location to facilitate
testing, repair and maintenance.
Flush upstream piping thoroughly to remove any foreign matter prior to installing the device.
Do not install the unit in areas subject to freezing temperatures.
INSTALL THE DEVICE WITH THE ARROW ON THE VALVE POINTING IN THE DIRECTION OF FLOW.
It is important that this unit be installed between shut-off valves in order to isolate the unit during repair and
service.
Provide sufficient support on the piping system upon installation of this unit.
On units with strainer option, it is recommended to remove and clean the strainer screen periodically as service
conditions warrant, to prevent malfunction.
OPERATION
The PRH is designed to reduce high supply pressure (up to 400 psig) to a lower outlet pressure within
it's adjustment range. The standard unit is factory set at 50 psig outlet pressure (static condition), and is ad-
justable from 25 to 75 psig (low and high pressure setting option available).
During static (no-flow) conditions, the valve is closed because the magnitude of the diaphragm force exposed to
the downstream pressure is greater than the valve spring force. The balance of the forces on the supply and
spring pressure (which tends to open the valve) against the diaphragm pressure, determines the outlet or re-
duced pressure downstream of the valve.
the set pressure. By decreasing the spring load (turning the adjusting screw counterclockwise), the set
pressure decreases.
Under flow conditions, the pressure under the diaphragm will start to fall below the set pressure causing the
spring and the supply pressure to open the valve and allowing more water to flow.
The amount of water that will pass through the valve depends on the difference between the inlet and the outlet
pressure. As the pressure differential increases, the volume of water increases.
MAINTENANCE
Regular inspection, testing and cleaning of water pressure reducing valve and other components in a piping sys-
tem assures maximum life and proper function.
The PRH is designed so that it can be serviced through the bottom plug without removing the cap and
disturbing the pressure setting. Both the seat and seat disc assembly can be accessed through the bottom plug.
NOTE: PRIOR TO DISASSEMBLING THE UNIT, SHUT-OFF WATER SERVICE AND RELIEVE PRESSURE DOWN-
STREAM.
a) DISASSEMBLY OF SEAT
1. Unscrew bottom plug.
2. Unscrew seat disc holder.
3. Remove seat.
b) DISASSEMBLY OF SEAT DISC
1. Remove bottom plug and seat disc holder.
2. In the seat disc holder, remove seat disc by
unscrewing the seat screw.
c) DISASSEMBLY OF DIAPHRAGM
CAUTION: CAP IS SPRING LOADED.
RELIEVE SPRING PRESSURE BY
UNSCREWING THE ADJUSTING SCREW
BEFORE ATTEMPTING TO REMOVE CAP!
1. Remove cap bolts.
2. Remove cap, spring retainer, and spring.
3. Unscrew diaphragm nut.
4. Remove diaphragm washer and diaphragm.
d) DISASSEMBLY OF BY-PASS ASSEMBLY
1. Unscrew bottom plug and remove seat disc holder.
2. Relieve spring pressure on the cap and remove
cap bolts. Dismantle the spring retainer and spring.
3. Remove yoke with diaphragm attached.
Do not unscrew diaphragm nut.
4. Unscrew the by-pass assembly.
MODEL PRH
(36H SERIES)
High Capacity
Water Pressure Reducing Valve
Increasing the spring load through the adjusting screw will increase
By-Pass Assembly
Body
Seat O-Ring
Seat
Seat Screw
Seat Disc Washer
Seat Disc
Seat Disc Holder
Disc Holder O-Ring
Bottom Plug O-Ring
Bottom Plug
I-5957-00
Adjusting Screw
Nameplate
Lock Nut
Self Sealing Washer
Cap Bolt
Cap
Spring Retainer
Spring
Diaphram Nut
Diaphragm Washer
Diaphragm
Yoke