37
Resetting of the shut-off valve with lever reset
(type SSV 8600)
– close the downstream stop valve
– slowly operate the resetting lever 27 clockwise
until the internal by-pass is open 26:
with this operation pressure fills the outlet cham-
ber 12, the control chamber 19 and the down-
stream pipe, checking on the manometer in-
stalled on the pipeline
– when the pressure indicated on the manometer
is stabilised, continue to move the lever 27 in
order to permit the connection of the control
lever 24; at this point the lever will remain stable
on the opening position.
After these operations, the shut-off valve is into
operation and it is possible to proceed slowly with
the opening of the downstream valve.
Shut-off valve calibration
The shut-off valve is usually supplied with calibra-
tion values according to the order. Should be nec-
essary to modify the calibration value, it must be
considered that the modification can be effected
only within the calibration range of the spring in-
stalled, otherwise it is necessary to substitute it with
a suitable spring to be selected referring to the
provided tables.
When the installed spring is appropriate to obtain
the required pressure, proceed as follows:
– over-pressure shut-off operation:
rotate in a clockwise direction the external screwing
ring increases the calibration value or in an anti-
clockwise direction to reduce it.
– low-pressure shut-off operation:
rotate in a clockwise direction the central screwing
ring to increase the calibration value or in an anti-
clockwise direction to reduce it.
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