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6.2.2. Accessing a Threaded Sensing Assembly (SA) - Threaded
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 2 should be used as a reference for the following set of instructions
i.
Remove the securing grub screw (3) from the regulator body (22).
ii.
Unscrew the pan screw (2) and remove the name plate (31) from the hand wheel (31).
iii.
Using a 24mm socket, unscrew the locknut (39) and remove the hand wheel (31) from
the adjusting screw (28).
iv.
With the regulator secured up-right in a vice, remove the bonnet (26) 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 (26) and
adjusting mechanism (1, 28, 29 & 30) from the body.
vi.
Remove the load spring (27).
vii.
The sensor assembly (5-9,11,12,23-25,33,35 & 38) can be removed from the body by
firmly gripping the flats of the lower spring rest with pliers and lifting.
viii.
If necessary, the baffle plate (34) and connector pin (19) can be withdrawn. Inspect
the connector for damage and replace if required.
ix.
Grip the flats of the lower spring rest (25) in a vice so that the vent seat nut (38) is
facing.
x.
The vent seat nut (28) can be removed using a 10mm open ended spanner and the
vent seat (23) can then be removed from the sensor (35) along with the 9mm x 1mm
'O' ring (6).
xi.
Inspect the vent seat (23) for damage and replace.
xii.
The sensor (35) can then be unscrewed from the lower spring rest (25) and the sensor
can then be removed from the sensor holder (33).
xiii.
Replace all 'O' rings (5 & 7-9) located on the sensor (35) and sensor holder (33) prior
to reassembly, ensuring adequate lubrication is used.
xiv.
Insert the sensor (35) into the sensor holder (33).
xv.
Apply a small droplet of Loctite 638, to the thread of the lower spring rest and screw
the lower spring rest (25) into the top of the sensor (35).
xvi.
Grip the flats of the lower spring rest (25) in a vice and tighten the sensor (35) against
it using the flats at the base of the sensor.
xvii.
Secure the vent seat nut (38) using a 10mm open ended spanner.
xviii.
Place the connector (19) into the baffle plate (34) and locate into the regulator body,
taking care not to damage the sealing edge of the connector.
xix.
After reassembling the sensor assembly, place into the regulator body (22) ensuring
that it is firmly in place.
xx.
Place the load spring (27) onto the spring rest (25).
xxi.
Screw the top works (1, 26, 28, 29 & 30) onto the regulator body ensuring that the
adjusting screw properly locates within the load spring and using a torque wrench,
tighten to 120Nm.
xxii.
Tighten the securing grub screw (3) against the bonnet (26).
xxiii.
The hand wheel (31) can now be secured on to the adjusting screw (28) using the
locknut (39).
xxiv.
The name plate (31) can then be secured using the pan screw (2).
11
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