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Self-Operated Pressure Controller
Pressure Reducing Valve Type PRV
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Installation
The valve should be installed in a horizontal pipeline with the
direction of flow as indicated by the arrow on the valve body.
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Steam and Compressed Air Capacities
How to use the chart by an
example:
The curved lines labeled 2, 3, 4, 5 etc., represent upstream
pressures. Downstream pressures are read along the vertical line on
the left 1 hand side of the chart.
Required, a reducing valve to pass
120 kg / h reducing from 8 to 6 bar. From the downstream pressure of
6 bar on the left hand side of the chart extend out horizontally
until the line meets the curved 8 bar upstream line. At this point
read vertically (according to fig)
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Sizes and Pipe Connections
1/2", 3/4", 1" Screwed BSP or NPT.
Note: Before carrying out any
work on the valve, make sure that it is fully isolated.
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To fit new valve and seat or to clean strainer screen
Release adjustment spring pressure by turning Adjustment knob (2) fully
anti-clockwise. Remove spring housing by undoing 4 spring housing bolts (7).
Lift out bellows assembly. Using 32mm A/F spanner, Unscrew seat (11) and
remove valve, return spring, strainer screen push rod and guide bush. Clean
strainer screen or replace with new valve and seat assembly. Re-assemble in
reverse order, using new gaskets, ensuring that components and seating faces
are clean: Tighten seat to 108/132 Nm. Tighten spring housing bolts to 8/24
Nm.
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How to Order
Always order spares by using the description given in the column headed
Available Spare and stating the size, rate and downstream&upstream
pressure range of the valve.
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