7
ix.
With O-ring (4) installed and suitably lubricated, lower the main valve (24) into the
bottom nut (20) through the main valve spring (21) and press down until the O-
ring (4) has engaged in the lower bore.
*NOTE: Press the main valve (24) down a couple of times, within the bottom nut
(20). The main valve should move freely, within the bottom nut and spring back to
start position.
x.
Position the soft seat (23) over the main valve (24), taking care not to damage the
sealing face as it passes over the main valve stem.
xi.
Install O-ring (5) around the soft seat (23).
xii.
Remove the regulator body (26) from the vice and whilst holding upright, insert
the main valve assembly (MVA), ensuring that the main valve (24) passes through
the air deflector (22) and screw in place until finger tight.
xiii.
Secure the assembly in a vice and proceed to tighten the bottom nut to 14Nm.
It is recommended that all parts in the repair kits are used. Any defect parts removed during
the service should be disposed of. Parts should be kept clean in line with media requirements.
Following re-assembly of the regulator, pressure tests should be made to both the inlet and
outlet side of the regulator, to ensure there is no internal or external leakage across the
regulator.
To ensure that the main valve assembly has been correctly and effectively installed it may be
required to perform the appropriate seat leak test as per ANSI/FCI 70-2.
6.1.2. Accessing the Sensor Assembly (SA)
To access the Sensor Assembly:
i.
Secure* the regulator body (26) in a vice and use a 4mm Allen key to remove**
the 6x M5 cap screws (2) and 6x M5 spring washers (3) from the regulator body.
*NOTE: Soft vice jaws must be used, when securing the body within the vice
against flats. (as without may cause damage to sealing surface for BSP O ring).
**NOTE: It is recommended to loosen one screw, followed by the screw directly
opposite and then proceed in either clockwise or anti-clockwise direction until all
screws have been loosened before completely removing the screws.
ii.
Lift the bonnet (25) from the assembly and remove the 10mm Ball Bearing (1),
Upper spring rest (17) and Load spring (16).
iii.
Remove and replace the O-ring (11) from the base of the bonnet (25)
iv.
Use pliers to grip the stem of lower spring rest (14) and lift/remove the sensor
assembly (7,9,12,14,15) from the Body (26).
v.
Grip the flats of the lower spring rest (14) in a vice so that the base of the sensor
(12) is facing upwards.
vi.
Remove the sensor (12) from the sensor holder (15) using an 21mm open ended
spanner or adjustable wrench, against the flats at the of the sensor (12).
vii.
Replace all ‘O’ rings (7&9) locat
ed on the sensor holder (15), prior to reassembly,
ensuring adequate lubrication is used.
viii.
The air deflector (16) is accessible at this point and can be removed* with a 20mm
socket.
