Val-Matic 30 and Larger Butterfly Valve - Manual (Page 7)

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CAUTION: Opening and Closing of the valve
should be done slowly to prevent
water hammer.
VALVE SEAT ADJUSTMENT: If the valve is found to
leak in service, the rubber seat can be adjusted. With
the valve in the closed position, tighten the three seat
bolts in the area of the leak 1/4 turn at a time until the
leak stops.
The factory settings for the seat bolts are given in
Table 3 for reference in case the valve cannot be
tested while under pressure. These torques are for
use with the disc in the closed position. Torques
greater than 150% of these will make the valve difficult
to operate.
TABLE 3. SEAT BOLT TORQUES
MAINTENANCE
The Series 2000 Butterfly Valve requires no scheduled
lubrication or maintenance other than regular
exercising. The exercising is achieved by fully opening
and closing the valve to verify smooth operation. If
operation is difficult, it may be necessary to flush
sediment from the valve by opening and closing the
valve several times under flowing conditions or
checking the lubricant in the gear actuator.
The recommended interval for exercising is every six
months or annually if the valve is regularly operated.
Over the life of the valve, inspection and some regular
adjustments may be needed as given below.
PACKING ADJUSTMENT: The shaft is equipped with
a set of V-shaped packing, which is factory-set for
drop-tight service. The packing is pressure assisted
and does not normally require adjustment. Should
leakage occur, the packing can be replaced.
PACKING REPLACEMENT: To replace the packing, it
is recommended that the line be drained and the
actuator removed. The valve can remain in the line.
1. To replace the packing, first open the valve and
drain the line.
2. Close the valve to hold the plug in position. For
power actuators, turn off and lock out electrical and
hydraulic supplies before proceeding.
3. Remove small round cover on actuator to expose
shaft and key.
4. Remove actuator mounting bolts and adapter plate
or packing retainer plate.
5. Lift actuator and plates from valve taking care not to
lose square key.
6. Remove old packing (13) with packing hook.
7. Lubricate new packing with FDA grease and set in
place one ring at a time taking care not to bend
over the lips of the packing rings.
8. Reinstall actuator mounting plates. Clean off all
grease from the surfaces of the actuator mounting
surfaces.
9. With valve in the closed position, place actuator
over valve and reinsert key (14).
10. Finally, with valve closed, install cover on actuator
indicating “Closed".
WORM GEAR ACTUATOR MAINTENANCE: A typical
worm gear actuator is shown in Figure 8 and consists
of a worm (3) mounted on an input shaft (9). The
worm engages a segment gear (2). When the worm is
turned, it drives the segment gear through 90
 of
rotation. The rotation of the segment gear is displayed
by the top indicator (5). The gears are lubricated with
EP2 grease in a cast iron housing (1). The open and
closed positions of the segment gear (2) are controlled
by the end position stop bolts (20). The stops can be
adjusted by loosening the lock nut (21) and rotating the
bolts (20).
The gearbox is factory lubricated and sealed. No
regular maintenance is required. If difficult operation is
observed, the cover can be removed and the unit
inspected for wear.
All moving parts should be coated with grease. The
grease should have an even and smooth consistency.
If needed, coat all moving parts with an EP-2 grease
such as Mobil Mobilux EP2. Buried units should be
packed 100% with grease.
WARNING: Drain Line and close valve before
removing actuator or valve may
rotate suddenly causing bodily
injury or damage to property.
SIZES CLASS 150B CLASS 250B
30”-48” 20-25 25-30 ft-lbs
54”-108” 25-30 30-35 ft-lbs