Flowserve NAF-Setball ball sector valve User Manual
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NAF AB
SE-581 87 Linköping
Telephone
+46 13 31 61 00
Facsimile
+46 13 13 60 54
Website:
www.naf.se
We reserve the right to design modifications
without prior notice
ISO 9001 Certified
10.
Fitting the Actuator to the Valve
1.
The actuator can be mounted directly on the
valve. The mounting flange and the valve stem
follow the NAF standard for securing the
actuator.
2.
Turn the valve to the closed position. The key
should face towards the inlet.
3.
Fit the actuator.
4.
Connect the compressed air supply to the
actuator - applies to pneumatic actuators.
If the end position stop is correctly set, the ball
segment will not move when compressed air
pressure is applied.
5.
If moving - adjust the end position stop until the
actuator has turned the ball segment to the
closed position.
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
clockwise, as viewed from the actuator.
Before fitting the actuator, it is important to ensure that
the actuator fits the stem. First try without key to check
that the drive slips onto the stem. Also check that the
key fits and matches the keyways in the stem. Grease the
actuator stem entry. Push the actuator onto the stem.
The rotary movement of the ball sector should be
restricted to 90°, which is the movement needed between
fully open and fully closed position. If the sector is turned
beyond this range, the sealing surfaces of the sector and
seat ring may be damaged. When an attempt is made to
turn the ball sector back to the correct position the sector
may jam against the seat ring.
In practice, this is prevented by the indicating pin. It will
come in contact with the bolts retaining the top cover if an
attempt is made to turn the ball sector outside the range
between fully open and fully closed position.
When adjusting the actuator, make sure that the sphere
of the ball sector (2) is centered against the seat ring (11)
in closed position, i.e. that the sphere projects equally on
both sides of the seat ring as shown in Fig. 5.
Fig. 5. Locating of the ball sector sphere when
adjusting the actuator