6 B 72 en
3
1
GENERAL
These manual hand wheel operators are designed for
Metso B1C-actuators. Hand wheel operator is intended to
be used for operating the pneumatic actuator in case of
supply power (air) or signal (air, electric) failure takes place.
These instructions contains the information needed for
operating the hand wheel operator, additional information
on B1-actuators are available from the instructions on
installation, operation and maintenance of the model in
question. See the IMO 6BC71en.
Manual hand wheel operator can be recognized from type
codes as follows: letter K and RK in type code is for hand
wheel on cylinder head, letter L and RL means that hand
wheel is installed on the bottom of the housing and R and
RR means that hand wheel is on both cylinder head and
bottom of the housing.
2
SAFETY PRECAUTIONS
3
B1C actuators, sizes 9 to 25
3.1
B1C_K/L/R actuator
The B1C_K actuator
is otherwise like the B1C except that it
can be operated manually to bring the piston to lower posi-
tion in case there is no air supply.
The B1C actuator can be changed into a B1C_K by replacing
the cylinder end (44) accordingly and adding parts (33a,
50a to 56a), see Fig. 1.
The B1C_L actuator
is otherwise like the B1C except that it
can be operated manually to bring the piston to upper
position in case there is no air supply.
The B1C actuator can be changed into a B1C_L by replacing
the housing (1) accordingly and adding parts (50b to 56b),
see Fig. 2.
The B1C_R actuator
is otherwise like the B1C except that it
can be operated manually to bring the piston either to
upper or lower position in case there is no air supply.
The B1C actuator can be changed into a B1C_R by replacing
the cylinder end (44) and housing (1) accordingly and add-
ing parts (33a,50a to 56b), see Fig. 1 and 2.
4
Maintenance
If air escapes between the spindle (50a) and spindle nut
(51a), check the O-ring (54a) and replace it if necessary. Also
check the condition of the cylindrical roller (56a). See Fig. 1
and 2. Other maintenance as described for the B1C actua-
tor, see the IMO 6BC71en and the section 4.
CAUTION:
Before operating the hand wheel make sure it is per-
mitted to manually operate the valve (without disturb-
ing the process).
CAUTION:
Air pressure must always be released before operating
manual hand wheel operator!
CAUTION:
Be careful when adjusting actuator travel stops. The
spindle nut (51) may come out if turned too much. If
the actuator is pressurized it can cause uncontrolled
pressure release which may result in damage or per-
sonal injury.
NOTE:
There is some air bleed trough the spindle thread when
the spindle (50a) with the O-ring (54a) is positioned inside
the cylinder. I.e. when the valve has been manually oper-
ated to open position during compressed air loss and
then the air pressure is restored. To stop the leakage oper-
ate the manual override to non-operated position. See
Fig. 1 and 2
NOTE:
Hand wheel operator is not correct device for safety lock
up of valve.
Locking device, code Q or W, is intended to be used for
safety lock up function during service operation. see IMO
6B70.
CAUTION:
Air pressure must always be released before operating
or servicing manual hand wheel operator!
Fig. 1
B1C_K_ actuator
Parts list for Fig. 1:
Part Quantity
Name
33a
1
O-ring
44
1
Cylinder end
50a 1
Spindle
51a
1
Spindle nut (use as a limit screw)
52a 1
Hand
wheel
53a 1
Lock
nut
54a 1
O-ring
55a
1 Spring
pin
56a 1
Cylindrical
roller
