Flowserve 051 000 Series - Manual (Page 7)

7
Flow Control
Kämmer Control Valves
®
6.4.3 Unscrew the coupling insert until the yoke rods are
raised from the lower yoke plate by around 2 mm.
NOTE: Ensure that the plug assembly is not rotated
with the plug seated. This may cause irreparable
damage to the seating faces.
6.4.4 Refit the coupling, ensuring that the arrows em-
bossed on the coupling halves, point upward towards
the actuator and secure with 2 retaining screws.
6.4.5 Apply supply pressure resp. vent actuator to half
stroke and refit and tighten yoke rod retaining nuts
(15).
6.4.6 Connect all tubing.
7 DISASSEMBLE AND ASSEMBLE VALVE
7.1 Disassemble Valve
(see Fig. 2)
7.1.1 Remove actuator from the valve (section 3)
NOTE: heavy assemblies may require a hoist
7.1.2 For a tank valve with an extending plug ( plug opens
into the vessel ), the plug needs to be removed before
the seat ring can be removed.
7.1.3 For complete maintenance the valve must be removed
from the tank because the seat ring serves also as
the flange facing for the flange connection. Remove
the valve from the tank. Remove the locknut and drip
protection. Unscrew the gland nut. Extract the plug
carefully from the valve.
NOTE: If the seat ring is not secured with a retaining
screw it might also detach from the valve body when
the plug is removed.
7.1.3 Check seating faces of seat ring and plug for damage.
Gasket surfaces must be clean and free of damage.
7.1.4 Remove the packing follower, packing and guide using
a drift.
7.1.5 If a seat surfaces require re-machining, seat and plug
seating surfaces must be reworked. The seat angle
on the plug is 30°, on the seat ring 25°. If the valve
is correctly assembled, lapping is not required.
NOTE: When re-machining the plug, protect plug stem
from damage. The seat surface must be concentric
to the plug stem. When re-finishing the seat, the seat
surface must be concentric to the seat outer diam-
eter.
7.2 Assemble Valve
(see Fig. 2)
7.2.1 All worn or damaged parts must be replaced. Reus-
able parts must be clean. Expendable parts such
as gaskets, packing and O-rings should always be
renewed.
7.2.2 Replace the bushing.
Extending plug
7.2.3 Fit new gasket and replace the seat ring. If a retaining
screw is provided, tighten this screw to secure the
seat ring in position.
7.2.3.1 Insert the plug stem through the seat ring into the
valve. Be careful not to damage the guide bushing.
Retracting plug
7.2.4 Insert the plug stem into the valve. Be careful not to
damage the guide bushing.
7.2.4.1 Fit new gasket and replace the seat ring. If a retaining
screw is provided, tighten this screw to secure the
seat ring in position.
7.2.5 Replace slotted nut. Replace packing by inserting the
packing rings one at a time tapping each one down
with a suitable bushing.
NOTE: ensure that the gaps in the packing rings are
distributed evenly around the circumference of the
packing box (gaps not in line).
7.2.6 Insert packing follower. Fit gland nut for transport
purposes only. Gland nut to be fitted correctly and
tightened down (see table 1) when actuator is mounted.
Replace the locknut and drip protection.
7.2.7 Refit the actuator (see section 6.2 and 6.4).