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6.3.1. Accessing the Air Actuator Bonnet Assembly – Threaded
The Air Actuated bonnet mechanism for the LF-792 can be accessed from the top of the
regulator. Ensure the air supply to the Actuator Bonnet is fully depleted, before carrying and
following instructions below:
*Note: Figure 3 should be used as a reference for the following set of instructions
i.
Remove the securing grub screw (2) from the regulator body (26), using a 2mm Allen
key.
ii.
Place the regulator up-right in a vice and secured against the flats of the body, remove
the bonnet (29) by using a wrench or equivalent with 60mm open end.
iii.
Un-screw and lift the Actuator Bonnet Assembly, inclusive of (1,3-6,11,29-35) from
the regulator body.
iv.
Place the Actuator Bonnet Assembly up-right in a vice and secure against the flats of
the bonnet (29)
v.
Un-screw and remove the 8x M5 Cap Head bolts (3) and spring washers (4), using an
M4 Allen key socket.
vi.
Remove the Actuator Top Cover (30) and Inspect the Diaphragm (32) for damage and
replace if necessary.
vii.
Lift and remove the Diaphragm Support Plate (33), inclusive of (5 & 34) from the Lower
bonnet assembly (1,6,11,29,31,35).
viii.
Remove the Conical Actuator Spring (35) and turn the bonnet upside down, so that
the base of the bonnet is facing upwards.
ix.
Remove and Inspect the OR-0150-20 O-ring (11) for damage and replace if necessary.
Re-Assembly
x.
Apply a small amount of PTFE lubricant to the OR-0150-20 O-ring (11) and place into
the O-ring groove within the base of the Actuator bonnet (29)
xi.
Place the Actuator Bonnet up-right in a vice and secure against the flats of the bonnet
(29)
xii.
Place/locate the Conical Actuator Spring (35) onto the Actuator Base (31) and above
the central bore over the top
xiii.
Apply a small amount of PTFE lubricant around the Air Connector (34) and Insert the
Air Connector inclusive of (5 & 33), through the centre of the Conical Actuator Spring
(35) and into the central bore of the lower bonnet assembly (1,6,11,29,31).
xiv.
Once located into place, press the Diaphragm Support Plate (33) up and down, to
check for clear signs of movement.
xv.
Place the Diaphragm (32), onto the Actuator Base (31) and Aline the P.C.D holes of
both parts.
xvi.
Place the Actuator Top Cover (30), onto the Diaphragm (32) Aline the P.C.D holes of
both parts.
xvii.
Screw/tighten the 8x M5 Cap Head bolts (3) and spring washers (4), into the P.C.D
Holes, using a torque wrench with a M4 Allen key socket and torque to 5Nm.
xviii.
Place the regulator up-right in a vice and secured against the flats of the body. remove
the bonnet (29) by using a wrench or equivalent with 60mm open end.
xix.
Screw the Actuator Bonnet Assembly, inclusive of (1,3-6,11,29-35) into the regulator
body and tighten, using a wrench or equivalent with 60mm open end.
xx.
Screw the securing grub screw (2) into the regulator body (26), using a 2mm Allen key.
13
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