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Adjustment
When pressure setting has been specified in order, the regulator
is set accordingly at the factory for test. Then, the spring
compression is fully removed to avoid unnecessary stress to
parts (diaphragm, spring) during the stocking.
It is necessary to proceed with adjustment before servicing.
The regulator pressure range is engraved on the serial plate.
Proceed as follows :
• Open stop valve on the outlet side of the regulator and partially
open stop valve on the inlet side, allowing pressure in the
system to build up slowly.
• Open controlled pressure line valve(s) and check setting by
means of the gauge(s). Set by means of the spring adjuster (2)
of the actuator.
(To increase pressure setting (or pressure differential), turn
adjusting screw clockwise to compress the spring. To decrease
the setting, turn adjusting screw counterclockwise to relieve
spring compression).
• Fully open stop valve on the inlet side of the regulator.
Maintenance
Regulator must be isolated and pressure vented before
disassembly.
Replacing diaphragm
On Spring Diaphragm Actuators
(500 Series Regulators - Figure 1)
• Remove the controlled pressure line from the diaphragm case
(13) and relieve all spring compression by unscrewing spring
adjuster (2).
• Remove upper diaphragm case (13), [nuts (16) and screws (15)],
[not screws (15) on 150-750 psi range].
a) On 0.5-2 / 1.5-3 / 2-10 / 6-20 / 15-40 / 30-75 / 60-125 and
80-250 psi ranges:
Remove locknut (28), diaphragm washer (14) and diaphragm (11).
b) On 150-750 psi range:
Remove diaphragm (11).
Note: By means of a wrench applied on the plug stem nuts, hold
the actuator stem during this operation.
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• Install new diaphragm and reassemble by reversing of the
above description order.
• Readjust the spring compression (see above).
On Differential Actuators
(500-50 Series Regulators - Figure 2)
a. On low pressure case design:
• Remove the high and low pressure lines from the
diaphragm case (13) and the diaphragm chamber (9).
• Relieve all spring compression by unscrewing spring
adjuster (2).
• Remove nuts (16) and cap screws (15). Remove upper
diaphragm case (13).
• Remove locknut (28), upper diaphragm plate (12), upper
O-Ring (25), washer (14) and diaphragm (11).
• Install new diaphragm and reassemble by reversing of
the above description order. Replace upper O-Ring (25) if
necessary.
• Readjust the spring compression (see above).
b. On high pressure case design:
• Remove the high and low pressure lines from the
diaphragm case (13) and the diaphragm chamber (9).
• Relieve all spring compression by uncrewing spring
adjuster (2).
• Remove nuts (16), upper diaphragm case (13) and
diaphragm (11).
• Install new diaphragm and reassemble by reversing of the
above description order.
• Readjust the spring compression (see above).
Replacing O-ring(s) (25)
(low and high pressure case)
On differential actuators, (Figure 2)
• Disassemble the actuator head as described on the
paragraph : "Replacing diaphragm".
• Remove diaphragm chamber (9) with plunger S/A (24).
• With a wrench applied over O-Ring retainer (26), unscrew it
out of diaphragm chamber (9).
• Remove O-Ring (25), being careful not to damage plunger.
Install new O-Ring, replace and tighten O-Ring retainer (26).
• Reassemble and readjust spring compression.
Uniformly tighten all diaphragm case nuts (16) when
reassembling.
Masoneilan 10900 Series Actuator Instruction Manual | 7
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