Flowserve Torex butterfly valves - Manual (Page 7)

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5. Adjust the end position stop until the actuator
has turned the valve disc to the sealing position.
This sealing position varies from valve to valve,
and the dimension is specified on the valve body
adjacent to the arrow showing the direction of
flow. See dimension ”A” in Fig. 4 in section 9.4.
6. General
The actuator may be fitted either in line with the
connected pipes or transversely to them. An
intermediate plate is necessary for mounting the
actuator in line with the pipework.
N.B. The direction of closure must always be clock
wise, as viewed from the actuator.
Before fitting the actuator, it is important to ensure
that the actuator fits the shaft. First try without keys, to
check that the drive slips easily onto the shaft. Also check
that the keys are easy to fit and match the keyways in the
shaft. Grease the actuator shaft entry.
Take care to ensure that the end position stops on the
actuator are correctly set and locked. If the end position
stop for the closed position is incorrectly set, the valve
disc may overtravel, which could damage the sealing
elements.