Installation, Operation and Maintenance Manual
SERIES T/TE/TW/TWE
ONE-PIECE TOP ENTRY
TRUNNION BALL VALVE
Page:
10
of
12
Document Name: IOM-T
Revision:
15333
Release Date: 06/26/2015
10)
GEAR OPERATOR FIELD ADJUSTMENT
I.
Locate “closed” stop adjustment screw on
gear operator. It is the screw on back of
gear case on same side of operator as the
hand wheel.
II.
Operate ball valve to full closed, “feel” the
valve hit the stop.
III.
With pressure on closed ball valve, loosen
the lock nut on “closed” stop adjustment
screw then back out screw [CCW] 3 or 4
turns.
IV.
Open bleed fitting on side (center) of ball
valve.
V.
Line media will escape from bleed fitting
while evacuating ball cavity. Allow a
minute or two for body cavity to bleed
down. If media continues to escape thru
bleed fitting, leakage is confirmed.
VI.
If leakage continues to be observed at
bleed fitting, turn gear operator hand
wheel clockwise (right) to further close the
ball valve. As hand wheel is turned,
observe for change in amount of flow out
bleed fitting. The objective is to find a
position where flow no longer comes from
bleed fitting. At each check position, it is
necessary to allow some time to see if the
flow changes. If a position is not found to
stop leakage in the CW direction, turn hand
wheel CCW to see if the valve may have
been over-closing.
VII.
If a position is found where leakage stops,
turn the stop-screw CW until it hits snugly
then tighten the lock nut.
VIII.
If a position is not found where leakage
stops, it can be concluded that the seat
insert is damaged and repair is necessary.
11)
VALVE MAINTENANCE OVERVIEW
Establish a valve Maintenance group
Have a set valve servicing schedule
Service schedule is dependent on the
media and the number of times the
valve is cycled
Valves should be lubricated at least one
time every six months.
12)
LUBRICATION EQUIPMENT
Hydraulic hand guns are efficient for 4”
Bore and smaller
Hand guns require 50 Strokes to move
1oz of product
Air operated guns are the most efficient for
6” bore and larger
13)
PROPER VALVE STORAGE
INSIDE STORAGE
Ball valves should be in the full open
position
End connection protectors should be tight
to prevent ingress of moisture and debris.
Valves should be left in original shipping
container (If possible).
14) TROUBLESHOOTING
Verify leakage (Block & Bleed)
Cycle the valve 3-6 Times
Wipes the ball and often allows trapped
debris to travel downstream
Can free-up a stubborn seat
Adjust Gear Operator/Actuator Stops
Occasionally, a stop set on a gear
operator may loosen causing the valve to
over or under level.
