6.10 Install KEY (250) on STEM (22) if applicable.
6.11 Slide TRAVEL STOP (230) over STEM (22)
and tighten TRAVEL STOP SCREW (240).
6.12 Install TOP PLATE (210) while ensuring the
TRAVEL STOP (230) orientation is correct.
6.13 Tighten the TOP PLATE SCREWS (220) to
torque value given in Table 4.
6.14 Remount operator.
6.15 Operate valve open and close several times
to check for binding and to set the stem seals.
Loosen GLAND NUTS (170) and then proceed to
retighten to the torque valves stated in Table 3.
7.0 SEAT REPLACEMENT
Before removing handle or the actuator from
the valve, or before removing seat retainer from
a valve in dead end service, close the valve and
depressurise the line.
Do not pressurise the line without an operator
mounted on the valve.
7.1 Refer Figure 1 (p.11) and Figure 2 (p.12) for
parts identification.
7.2 With the DISC (21) in the closed position,
remove the valve from the line.
7.3 Lay the valve down with the DISC (21) in the
closed position and the seat retainer side facing up.
7.4 Remove the RETAINER PLATE SCREWS
(60), RETAINER PLATES (50), SEAT RETAINER
(40), and SEAT (30).
7.5 Carefully clean the seat area in the BODY
(10) and SEAT RETAINER (40).
Remove foreign material, dirt, etc. Check disc
seating area for nicks or scratches.
7.6 With the DISC (21) is in the CLOSED position,
place the new SEAT (30) on DISC (21), carefully
centering it in the recess in the BODY (10).
7.7 Carefully place the SEAT RETAINER (40) in
position on top of SEAT (30).
7.8 Slide in the RETAINER PLATES (50) into the
groove on the SEAT RETAINER (40) and align
the countersunk holes to the tapped holes on
the BODY (10).
7.9 Lightly grease the threads and install the
RETAINER PLATE SCREWS (60).
Table 4: TOP PLATE SCREW TIGHTENING TORQUE
Tightening Torque (Nm)
Valve
Size
Series
4D/4E
Series
4F/4 G
Series
4H /4J
Series
4K/4L
PN 10 PN 16 PN 25 PN 40
Screw Tor que Screw Tor que Screw Tor que Screw Tor que
DN 65 M8 15 M8 15 M8 15 M8 15
DN 80 M8 15 M8 15 M8 15 M8 15
DN 100 M8 15 M8 15 M8 15 M8 15
DN 125 M8 15 M8 15 M10 30 M10 30
DN 150 M8 15 M8 15 M10 30 M10 30
DN 200 M10 30 M10 30 M12 50 M12 50
DN 250 M12 50 M12 50 M12 50 M12 50
DN 300 M12 50 M12 50 M20 245 M20 245
DN 350 M20 245 M20 245 M20 245 M20 245
DN 400 M20 245 M20 245 M20 245 M20 245