Adjustment; Shutdown; Maintenance - Fisher 133H Instruction Manual

133 Series

Adjustment

To increase the pressure setting, remove the closing
cap (key 9, Figures 10, 11, 12 and 14) and turn the
adjusting screw (key 11) clockwise; to lower the
setting, turn the adjusting screw counterclockwise.
A pressure gauge should always be used when
adjustments are being made. Do not adjust the spring
to produce an outlet pressure setting above the limit
stamped on the nameplate (key 38, not shown),
located on the casing flange. If the required pressure
setting is not within the range of the spring in use,
substitute with the correct spring. Ranges of available
springs are shown in Table 1. When changing the
spring, also change the nameplate, located on the
casing flange, to indicate the outlet pressure range.

Shutdown

Isolate the regulator from the pressure system and
release pressure from the outlet and the control line.
Inlet pressure will then automatically be released as
the regulator opens up in response to the lowered
pressure on the diaphragm.

Maintenance

This section includes instructions for disassembly
and replacement of parts. All key numbers refer to
Figures 10, 11, 12 and 14, except where indicated.
!
To avoid personal injury, property
damage or equipment damage caused by
sudden release of pressure or explosion
of accumulated gas, do not attempt any
maintenance or disassembly without
first isolating the regulator from system
pressure and relieving all internal
pressure from the equipment.
Do not loosen the diaphragm casing cap
screws (keys 35 and 36) when the control
spring (key 12) has spring force applied
to it. Release the spring compression as
described in step 7.
Due to normal wear that may occur in gas regulators,
parts must be periodically inspected and replaced if
necessary. The frequency of inspection, maintenance
and replacement of parts depend upon the severity of
service conditions or requirements of local, state and
federal regulations.
6
WARNiNG
W1390/IL
Figure 4. Spring Case Inserted in Body for Disassembly. Note
Proper Method of Holding Stem and Sleeve When Loosening or
Tightening Stem Nut.
Types 133H, 133L and 133Z
Disassembly
1. Disconnect the downstream control line from the
regulator and disconnect the remote vent pipe if
one is used.
Allowing a slight amount of compression
to remain in the regulator spring (key 12)
will facilitate disassembly of the trim parts.
2. Unscrew the four locknuts (key 34) and lift the
actuator portion off the body (key 1). All of the trim
parts will come out of the body with the actuator.
Inspect the valve disk (key 28), orifice (key 2) and
restriction collar (key 46, Figure 13), if used.
3. For further field disassembly and inspection, the
actuator may be turned upside down and the
spring case (key 8A) inserted into the body cavity
(see Figure 4).
Use care in performing step 4 to guard
against damage to the balancing
diaphragm (key 22).
Note
CAUTiON