Maintenance - Cameron TYPE 31 Installation, Operation And Maintenance Manual

Open and Closed Viewports
Once the pipe plug and relief plug are removed from the valve mounting flange, the position of the keyshaft
stop relative to the valve stops can be observed on valves with nominal stem sizes of 3" and larger.
The valve is fully opened when the keyshaft stop butts against the valve stop as viewed through the
"open viewport" and is fully closed when the keyshaft stop butts against the valve stop as viewed through
the "closed viewport".
Figure 8 shows the viewport locations for valves with a 3" stem size and figure 9 shows the viewport locations
for valves with 4" and larger stem sizes.
CLOSED VIEWPORT
STEM SEALANT
PORT (REF.)
Figure 8 - Open and Closed Viewport Location for Valves
with 3" Stem Size: Valve shown in Open Position.
Operating Times
Quick Operating Time
Opening or closing a valve quickly induces loads in
addition to the normal torsion load. It is therefore
necessary to limit valve operating times in order to
prevent over stressing of the valve.
Valves can be safely operated with an operating
time given by the formula:
*Quick operating time =
If a faster operating time is required, please call your
Cameron Valves & Measurement Representative.
Longest Operating Time
When the valve is being operated, the seat face is
exposed. Therefore, to minimize the amount of time
in which the seat face is exposed, Cameron Valves
& Measurement group recommends a maximum
operating time as follows:
*Longest Operating Time = 5 x Valve nominal bore
*The time is in seconds and the bore size is in inches.
CAUTION: Failure to follow these operating times
could cause damage to the valve.
Installation, Operation and Maintenance Manual
VALVE
KEYSHAFT
STOP
STOP
VALVE OPEN
OPEN VIEWPORT
Valve nominal bore
2
(i.e., one minute
per foot of nominal
bore)
E N G I N E E R E D V A L V E S
CLOSED VIEWPORT
STEM SEALANT
PORT (REF.)
Figure 9 - Open and Closed Viewport Location for Valves with 4"
and Larger Stem Sizes: Valve shown in open Position.

Maintenance

The CAMERON T31 Fully Welded Body Ball Valve
requires a minimum of maintenance. In order to
optimize the life of the valve, the maintenance
procedures on pages 6 and 7 should be followed.
Operation
Operating the valve is an important part of routine
maintenance. Operation of the valve will help to
break-up any buildup on the seat face and/or ball
and, if so equipped, will rotate the seat rings 15°,
distributing the wear on the insert.
6
VALVE
KEYSHAFT
STOP
STOP
VALVE OPEN
OPEN VIEWPORT
IOM-CAM-BALL-T31