Flowserve PA46 - Manual (Page 19)

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Replacing stuffing box, valve seat and valve plug PA 46, PA 47
. Undo retaining piece for forkhead T and pull out hand lever 1. Fig. 3
. Unscrew hexagonhead cap screws W and remove locking lever A.
3. Remove pressure plate V and mounting bracket B.
4. Pull out split pin S.
5. Use openend spanner A. F. 8 mm to unscrew the pressure pin R from the valve plug D.
6. Remove compression spring P.
7. Use openend spanner A. F. 3 mm to unscrew the union nut O.
8. Unscrew sealing plug G and remove gasket F.
9. Pull out valve plug D.
0. Take out internal parts N M L K L J of stuffing box.
. Use steel punch to knock the valve seat H out of the valve body I. Fig. 7
. Clean stuffing box and valve body.
3. Insert new valve seat
H such that two opposite holes are in the flow direction of the intermittent
valve.
4. Use punch made of CuZn to fix the valve seat in the valve body. Fig. 8
5. Reinsert valve plug D and use abrasive paste type TETRABOR ® F400 for polish grinding.
6. Insert new gasket F and screw in sealing plug G. Tighten with a torque of 350 Nm.
7. Reinsert internal parts of stuffing box according to order as specified on page 4. Fig. 5, Fig. 6
8. Apply heatresistance lubricant to stuffing box thread (use e.g. WINIX ® 50).
9. Align valve plug D such that the hole for the split pin S is perpendicular to the flow direction of the
intermittent valve.
0. Use openend spanner A. F. 3 mm to screw in union nut O and tighten at room temperature with
a torque of 55 Nm.
. Apply heatresistant lubricant to both sides of the compression spring P (use e. g. WINIX ® 50)
and place it onto the union nut O.
. Use openend spanner A. F. 8 mm to screw the pressure pin R onto the valve plug D until the
holes for the split pin S in the valve plug and the pressure pin overlap.
3. Insert split pin S.
4. Put mounting bracket B and pressure plate V in place. Align check hole C to the right.
5. Insert and screw in hexagonhead cap screws W and locking lever A and tighten them in
diagonally opposite pairs, applying a torque of 20 Nm.
6. Insert hand lever 1 and fix it to the forkhead T by means of retaining piece 3.
7. Operate valve once (open it until it hits the stop).
WINIX ® 50 is a registered trademark of WINIX GmbH, Norderstedt
TETRABOR ® is a registered trademark of WackerChemie GmbH, Kempten
Maintenance
 continued 