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We recommend that the filter should be removed and the vent port should be piped off to
safe location or drain and should not point towards the operator during service work, if using
a hazardous media through the regulator.
6.1. Servicing the SS-414G
*Note: Fig 1 should be used as a reference for the following set of instructions
6.1.1. Accessing the Main Valve Assembly
*The top works and sensor assembly must first be removed to access the main valve
assembly. Before continuing follow the steps 'i. – X.' shown in - '6.1.2. Accessing the Sensor
Assembly'.
To access the Main Valve Assembly:
i.
With the flats of the regulator body (29) secured in a vice*, Unscrew** the Body
Nut (31) from the Body (29) of the regulator to access the lower section of the
main valve assembly.
*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 Bottom Nut has been torqued to 30Nm.
ii.
Remove and replace the 'O' rings (8 & 30) located on the Bottom Nut (31)
iii.
Remove the Main Valve Spring (19).
iv.
Secure the upper section of the Main Valve (18) with a 10mm socket and use a
7mm socket to turn the Seat Nut (17) anti-clockwise.
v.
Remove the Seat Nut (17) with 'O' rings (8,12,30) and Soft Seat (21) from the lower
main valve assembly.
vi.
The Main Valve Pin (18) should be removed* through the top of the regulator to
avoid damaging the 'O' ring (11) and Back Up Ring (13) located on it.
*NOTE: The Main Valve Pin (18) can only be removed this way.
vii.
Remove the Hard Seat (20) from the regulator Body (29) by turning it anti-
clockwise with a 19mm socket.
*NOTE: There may be some increased resistance and good fit between socket and
hard seat must be achieved to prevent it from any potential damage on flats.
viii.
Apply two drops of Loctite thread lock 638 (or equivalent) and insert a new Hard
Seat (20) into the regulator Body (29) after carefully positioning the 12 x 1mm 'O'
ring (6) into the body.
ix.
Check for any damage* on the main valve (18), replace where required.
*NOTE: for (SV) regulators, special attention must be paid to sealing face on the
cone, located on the top of the valve, replace where required.
x.
Replace the 'O' ring (11) and Back-Up Ring (13) on the Main Valve (18) (ensuring
adequate lubrication is used) and place the main valve into position through the
top of the regulator body with the hex section facing upwards.
xi.
Turn the regulator body upside down so that the lower section of the main valve
is visible and place a new Soft Seat (21) onto the Main Valve stem (18).
7
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