AAON LC-054 - Manual (Page 35)

35
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
Care should be taken when
performing procedures 3 and 4. Read
instructions carefully.
Care should be taken when
performing procedures 3 and 4. Read
instructions carefully.
WARNING WARNING