Flowserve PA46 - Manual (Page 22)

WINIX ® 5000 is a registered trademark of WINIX GmbH, Norderstedt
Maintenance
 continued 
If fluid leaks out of the control hole C, retighten the stuffing box with the union nut O.
. Insert pin punch through opening of the mounting bracket B and push it into one of the holes of the
union nut O. Carefully tighten union nut clockwise until the fluid stops leaking out of the control
hole C.
. Operate valve once  the valve must close automatically, ensuring tight shutoff.
Retightening stuffing box
Attention
■
The torque for tightening the hexagonhead cap screws 5 must not exceed 5 Nm
because higher torques could damage the control membrane!
Attention
■
If the stuffing box cannot be tightened further by means of the union nut O all internal
parts of the stuffing box must be replaced!
■
If the force of the spring does not close the valve automatically loosen the union nut
O a little. If fluid leaks out of the control hole the internals of the stuffing box must be
replaced.
. Detach pressure line for the control fluid of the diaphragm actuator.
. Unscrew hexagonhead bolts
5 and hexagon nuts. Fig. 9
3. Remove and clean upper part 6 of the diaphragm actuator.
4. Take out old control membrane 7. Clean lower part 8.
5. Insert new control membrane 7, aligning its holes with the holes of the lower part.
6. Put upper part 6 on top and align its holes with the holes of the control membrane and the
lower part.
7. Insert hexagonhead bolts 5 and tighten them with the respective hexagon nuts in diagonally
opposite pairs to a torque of 5 Nm.
8. Attach pressure line for the control fluid of the diaphragm actuator.
9. Check tightness. If necessary retighten hexagonhead bolts
5 carefully in diagonally opposite pairs.
0. To grease the guide plate pin 9 apply lubricant to the grease nipple in the connecting socket of the
diaphragm actuator (use e. g. WINIX 5000).
Replacing control membrane in diaphragm actuator MPA 46, MPA 47