25
FMPRV41
Figure 19: Cleaning the main valve head and seat
Where a new part has been fitted it will be necessary to reset the main valve pushrod to
give the correct valve lift: (Refer to Figure 20)
To do this it is necessary to expose the main diaphragm plate
(2)
and pushrod assembly
(5)
.
1.
Undo the long nuts and pull away.
2.
Undo the M12 nuts and bolts
(1).
3.
Drop away the lower diaphragm chamber (4), the two diaphragms
(3)
, and diaphragm
plate
(2)
and pushrod assembly
(5)
.
Figure 20: Resetting the main valve pushrod
Table 2: TORQUE FOR MAIN VALVE SEAT FMPRV41 STEAM/AIR
Strainer
screen (1)
Gasket (2)
Main valve spring (3)
Main valve head (4)
Main valve seat
(5)
M12 nuts
and bolts (1)
Push Rod
assembly (5)
Diaphragm Plate (2)
Main Diaphragms (3)
Lower Diaphragm
Chamber (4)
