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6.1.2. Accessing the Sensing Assembly (SA) – Dome Top
The loading mechanism and vent seat for the LF-792 can be accessed from the top of
the regulator. Ensure the spring is de-compressed by rotating the hand wheel fully
anti-clockwise and follow the instructions below:
*Note: Figure 1 should be used as a reference for the following set of instructions
i.
Remove the securing grub screw (3) from the regulator body (17).
ii.
Unscrew the pan screw (2) and remove the name plate (25) from the hand
wheel (24).
iii.
Using a 24mm socket, unscrew the locknut (34) and remove the hand
wheel (24) from the adjusting screw (21).
iv.
With the regulator secured up-right in a vice, remove the bonnet (19) by
using a torque wrench or equivalent with 47mm open end.
v.
Un-screw and lift the top works from the assembly, inclusive of the bonnet
(19) and adjusting mechanism (1,7,20-23 & 32) from the body.
vi.
Remove the lower spring rest (32) from the bonnet.
vii.
Remove the 35mm x 2mm 'O' ring (7), from the lower spring rest and
replace, ensuring adequate lubrication is used.
viii.
Remove the load spring (20).
ix.
The sensor assembly (4-6,8,9,11,12,18 & 29-31) can be removed from the
body by screwing an M5x08 bolt, into the M5 threaded bore situated on
the top of the sensor holder and then firmly grip the bolt with pliers and
lift.
x.
If necessary, the baffle plate (26) and connector (16) can be withdrawn.
Inspect the connector for damage and replace if required.
xi.
The vent seat (18) can be accessed by removing the sensor (31) from the
sensor holder (30) and gripping the flats at the base of the sensor firmly in
a vice with the vent seat nut (29) facing upwards.
xii.
The vent seat nut (29) can be removed using a 10mm open ended spanner
and the vent seat (18) can then be removed from the sensor (31) along
with the 9mm x 1mm 'O' ring (5).
xiii.
Inspect the vent seat (18) for damage and replace, along with the new 9mm
x 1mm 'O' ring (5).
xiv.
Secure the vent seat nut (29) using a 10mm open ended spanner.
xv.
Replace all 'O' rings (4,6,8 & 9) located on the sensor (31) and within the
sensor holder (30) prior to reassembly, ensuring adequate lubrication is
used.
xvi.
Place the connector pin (16) into the baffle plate (26) and locate into the
regulator body, taking care not to damage the sealing edge of the
connector.
xvii.
After reassembling the sensor assembly, place into the regulator body (17)
ensuring that it is firmly in place.
xviii.
Remove the M5 screw from the sensor holder (30) if used.
7
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