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6.1.2. Accessing the Sensor Assembly (NV)
The loading mechanism and sensor assembly for the SS-414 can be accessed from the top of
the regulator. Ensure the spring is de-compressed by rotating the Adjusting Screw fully anti-
clockwise and follow the instructions below:
To access the Sensor Assembly:
i.
Remove the securing M3 Grub Screw (3) from the regulator Body (29).
ii.
Unscrew the Pan Screw (2) and remove the Name Plate (23) from the Locking Cap
(25)
iii.
Loosen the 3x M6 Grub Screws (4) and the 2x M6 Grub Screws (5) in the Locking
Cap (25) and lift the locking cap from the assembly
iv.
With the flats of the regulator body (29) secured in a vice*, remove** the Bonnet
(27) by using a torque wrench or equivalent with 47mm open end
*NOTE: Soft vice jaws must be used, when securing the body within the vice
against flats. Due to the position of the flats it may be necessary to angle the body
in the vice with the bottom nut upright for access.
**NOTE: That the Bonnet has been torqued to 120Nm.
v.
Un-screw and lift the top works from the assembly, inclusive of the Bonnet (27),
Load Spring (36), adjusting mechanism (1,7,9,10,24,28) from the body.
vi.
The sensor assembly (14-16,22,33-35) can be removed from the body by using
pliers.
vii.
Remove the Sensor (34) from the Sensor Holder (33), by pressing the sensor (from
the domed top) out of the sensor holder.
viii.
Replace all 'O' rings (14-16,35) located on the Sensor (34) and Sensor Holder (33)
prior to reassembly, ensuring adequate lubrication is used.
ix.
Push the Sensor (34) into the Sensor Holder (33), ensuring the sensor holder is
oriented correctly in relation to the sensor (See figure 1)
x.
Place the sensor assembly (14-16,33-35) into the regulator Body (29) ensuring that
it is firmly in place. Press down on the sensor (34), ensuring that it springs back
into position to ensure all parts are engaging correctly.
xi.
Screw the top works assembly, inclusive of the Bonnet (27), Load Spring (36),
adjusting mechanism (1,7,9,10,24,28) into the regulator Body (29) and using a
torque wrench, tighten to 120Nm.
xii.
Tighten* the securing M3 Grub Screw (3) against the Bonnet (27).
*NOTE: Take care to not overtight as this may damage M3 hex socket.
xiii.
The Locking Cap (25) can now be secured on to the Adjusting Screw (28) using the
2x M6 Grub Screws (5).
xiv.
The Name Plate (23) can then be secured using the Pan Screw (2).
The regulator is ready to be set. When the desired outlet pressure has been set, use the 3x
M5 Grub Screws (4) to secure the Locking Cap (25) to prevent further adjustment.
It is recommended that all parts in the repair kits are used. Any defect parts removed during
the service should be disposed of.
9
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