133 Series
8
and the lower casing (key 7) until the diaphragm fits
smoothly over the diaphragm plate without wrinkles
and the bead fits snugly and evenly in the groove
provided in the lower casing. This can be done with
a small screwdriver, but be careful no to puncture the
diaphragm (see Figure 6).
4. When replacing the cage, insert the set screws
(key 39) only far enough to retain the cage.
Do not tighten.
5. The registration disk (key 29) is marked for
proper placement; be certain it is positioned
correctly on the stem.
CaUTIOn
Always use the stem sleeve wrench flats
when loosening or tightening the nuts
(key 20 or 31) to prevent twisting of the
main and balancing diaphragms (keys 15
and 22).
6. Be certain the Belleville spring washer (key 3) is
in good condition and is in place before placing
the actuator on the body.
Type 133HP
Disassembly
!
WaRnIng
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 (Figure 9, keys 35 and 36) when
the control spring (key 12) has spring
force applied to it. Release the spring
compression as described in step 6.
This section includes instructions for disassembly
and replacement of parts for the Type 133HP. All key
numbers refer to Figures 7, 8, 9, 14, and 15.
1. Disconnect the downstream control line from the
regulator and disconnect the remote vent pipe if
one is used.
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.
The valve disc (key 28), orifice (key 2), and
restriction collar (key 46) can now be inspected.
CaUTIOn
Use care in performing step 3 to guard
against damage to the balancing
diaphragm (key 22).
3. Insert a 1/2-inch (12,70 mm) open-end wrench
between the legs of the cage (key 5) and place
the wrench on the stem sleeve wrench flats. Hold
this wrench while unscrewing the nut (key 31) to
prevent stem and stem sleeve (keys 18 and 25)
rotation and diaphragm damage due to twisting.
4. Remove the washer, registration disc and
valve disc (keys 30, 29, and 28). To remove the
restriction collar loosen the set screw (key 47) and
slip the E-ring (key 26) and collar off the stem. Lift
off the orifice (key 2) and replace the valve disc
and orifice if necessary.
5. Loosen the set screws (key 39) in the cage and
remove the roll pin (key 27) from the stem. Remove
the cage and stem sleeve, the sealing washer under
the balancing diaphragm, flat washers
(key 23), balancing diaphragm and balancing
diaphragm plate (key 21). Replace the sealing
washer and balancing diaphragm if necessary.
!
WaRnIng
• To avoid personal injury due to the
sudden uncontrolled movement of
parts, 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 6 below.
6. To inspect or replace the upper stem seal
O-ring or main diaphragm (key 15), remove the
closing cap (key 9), and inspect the closing cap
gasket (key 10). Release the spring compression
completely by loosening the hex nut (key 59) and
turning the adjusting screw (key 11) counterclockwise.
