Val-Matic Rubber-Seated Ball Valve - Manual (Page 8)

8
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 4 for reference in case the valve can not be
tested while under pressure. These torques are for
use with the ball in the closed position. Torques
greater than 150% of these will make the valve difficult
to operate.
TABLE 4. SEAT BOLT TORQUES
MAINTENANCE
The Series 4000 Rubber-Seated Ball 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 ball 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 (24).
10. Finally, with valve closed, install cover on actuator
indicating “Closed".
TRAVELING NUT ACTUATOR MAINTENANCE: A
typical traveling nut actuator is shown in Figures 5 and
6 and consists of a threaded nut (12) which travels
back and forth on a threaded stem (14). The stem is
lubricated with EP2 grease in a cast iron housing (1).
The nut, in turn, drives a slotted lever (4) through 90
degrees of travel. The lever (4) drives the valve shaft
with a square key. The rotation of the shaft is displayed
by the top indicator (19).
The full open and closed positions are controlled by the
stop bolts (7). The stop bolts can be adjusted by
loosening the lock nut and rotating the stop bolt ½ turn.
The gear box 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 90% 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 150 CLASS 300
4”-24” 5-10 10-15 ft-lbs
30”-48” 5-10 10-15 ft-lbs