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To ensure the best possible results from servicing, when re-assembling the regulator
and any assemblies within it, ensure that all areas of the components and the
regulator body are cleaned and free from contaminants which may result in failure of
the regulator.
6.1. Servicing Main Valve Assembly
6.1.1. Accessing the Main Valve Assembly (MVA)
*Note: Figure 1 should be used as a reference for the following set of instructions
To access the Main Valve Assembly:
i.
Firmly clamp the flats at the bottom of the regulator in the vice, with the
bottom nut (15) facing up.
ii.
Remove the bottom nut (15) from the body (17).
iii.
The valve spring (33), main valve (27), seat cartridge (28) and soft seat (35)
can now be removed from the assembly.
Note: It may be necessary to remove the regulator from the vice to do so.
iv.
The connector pin (16) may also be withdrawn at this point by up righting
the regulator with the main valve assembly removed.
Note: Care should be taken when reassembling not to damage the sealing
face of the connector pin (16).
v.
Use needle nose pliers to replace the connector pin chamfer down into the
body, while the body is up-side down. The pin should locate within the
baffle plate (26).
vi.
The new soft seat (35) should be placed in the seat cartridge (28) with the
BS 806 'O' ring (14).
vii.
These can then be placed into the regulator body, being careful to ensure
that the BS 806 'O' ring (14) remains in place and that the seat cartridge
(28) locates in the correct place within the body (17).
viii.
The main valve (27) can then be placed within the seat cartridge (28).
ix.
The main valve spring (33) can now be placed on the stem of the main valve
(27).
x.
Replace the BS019 'O' ring (13) and back up ring (10) on the bottom nut
(15), then assemble into the regulator body.
xi.
Use a torque wrench, tighten the bottom nut (15) against the body (17) to
40Nm.
It is recommended that all parts in the repair kits are used. Any defect parts removed
during the service should be disposed of.
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
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