22
DUAL PUMPS cont.
5.
Tighten set screw (11) to lock the locking
handle (3) in position
THIS HANDLE SHOULD NOT BE
ROTATED PAST THE VERTICAL
POSITION.
Note:
Ensure the isolated pump is not operating
before attempting to release the locking
mechanism. Failure to do so may result in injury
to the operator and/or damage the pump.
Unlocking:
1.
Open the interconnecting valve on the seal
flush line to pressurize the serviced pump and
vent air through bleeder valve on series 4302.
Close these valves once the pressure is equalized
and air removed.
2.
Loosen set screw (11) and lower locking
handle (3) to the horizontal position, secure with
set screw (11).
3.
Rotate valve to center position so that the
center pin of the locking arm (4) locates in the
recess on the locking handle (3).
4.
Loosen set screw (11) and raise locking arm
(3) to the vertical position, locking the center pin
in the locking arm recess, secure with set screw
(11).
Suction Valve
Manual Operation:
The suction side valve is designed for use as a
manually operated isolation valve. This valve is
not designed to automatically pivot as the
discharge flappers do.
Locking:
1.
Loosen suction side set screw (11) to release
the locking handle (3).
2.
Rotate the suction side locking handle (3) so
that the handle points towards the pump to be
serviced and secure in the horizontal position,
using set screw (11). This releases the suction
locking arm (4).
Note:
The locking handle (3) should only be
rotated towards the pump stopped for service.
The suction valve is designed to prevent the
locking handle (1) from rotating towards the
running pump, as the suction of the running
pump could cause the valve to slam shut with
sufficient force to injure the operator and/or
cause damage to the pump. Do not attempt to
circumvent this safety feature.
3.
Rotate the suction valve towards the pump to
be isolated. The orientation of the shaft is
indicated by the center pin on the locking arm
(4).
4.
Loosen set screw (11) and raise the locking
handle (3) so that the cam on the base on the
handle forces the pin of the locking arm (4)
towards the pump to be isolated. The locking
handle (3) should be raised to between 45
degrees and the vertical position.
THIS HANDLE SHOULD NOT BE
ROTATED PAST THE VERTICAL
POSITION.
5.
Tighten set screw (11) to secure the locking
handle (3) in position.
Unlocking:
1.
Open the interconnecting valve on the seal
flush line to pressurize the serviced pump and
vent air through bleeder valve on series 4302.
Close these valves once the pressure is equalized
and air removed.
2.
Loosen set screw (11) and lower locking
handle (3) to the horizontal position, secure with
set screw (11).
NOTE:
Keep hands and tools away from suction
valve locking arm when freed by locking handle
as differential pressure may cause arm to rotate
quickly with force when unlocked.
