CLA-VAL
90-01
Pressure Reducing Valve
`
CLA-VAL
Europe
www.cla-val.ch
1
-
090001CE
A 12/06
`
Operating
data
1.1
`
PRESURE
REDUCING
FEATURE
Pressure reducing control (
5
) is a "normally open" control that senses main valve (
1
) outlet pressure changes. An increase in
outlet pressure tends to close control (
5
) and a decrease in outlet pressure tends to open control (
5
). This causes main valve
cover pressure to vary and the main valve (
1
) to modulate (open and close) maintaining a relatively constant outlet pressure.
Pressure reducing control (5) adjustment:
Turn the adjusting screw clockwise to increase the setting.
1.2
`
OPENING SPEED CONTROL
Flow control (
4
) regulates the opening speed of main valve (
1
).
Flow control (4) adjustment:
Turn the adjusting screw clockwise to make the main valve open more slowly.
1.3
`
(E*) EUROPEAN STANDARDS
ITEM (
2
) - Isolation ball valve:
The isolation ball valves are used to isolate the pilot system from main line pressure. These isolation ball valves must be
open during normal operation.
ITEM (
3
) - Y-Strainer with incorporated orifice:
The strainer is installed in the pilot supply line to protect the pilot system from foreign particles. The strainer screen must be
cleaned periodically.
1.4
`
OPTIONAL
FEATURES
Suffix (
A
) - Internal strainer self-cleaning:
In some applications the self-cleaning strainer CLA-VAL, type
X46A
screwed at the inlet of main valve (
1
) reduces
maintenance generated by the cleaning of the standard strainer screen (
3
).
With this option (
A
) the strainer
X46A
replaces the strainer (
3
) and the orifice of the
X44A
strainer (
3
) is replaced by the
orifice assembly
X58-CSA
.
The cleaning of the strainer
X46A
is requesting its removal from the main valve body (
1
).
Suffix (
C
) - Closing speed:
Flow control (
C
) regulates the closing speed of main valve (
1
).
Flow control (C) adjustment:
Turn the adjusting screw clockwise to make the valve close more slowly.
Suffix (
Y
) - High capacity filter:
When too many foreign particles are contained into the control pressure, it is recommended to replace the standard filter
X44
by the high capacity filter
X43/80-EP
, whose screen (Ø 80 mm x 110 mm) offers a much bigger filtration surface.
However an additional union fitting, with incorporated calibrated orifice, model
X52-VR
must be mounted between the filter
outlet and the T-piece connecting the main valve control chamber.
1.5
`
CHECK LIST FOR PROPER OPERATION
□
System valves open upstream and downstream.
□
Air removed from the main valve cover and pilot system at all high points.
□
Isolation valves (
2A
), (
2B
) and (
2C
) open.
□
Periodical cleaning of the filter screen (
3
) or of the self-cleaning strainer, [optional feature (
A
)].
Summary of Contents for 90-01
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