Spring Return Actuators:
A. Back off one travel stop screw, leaving it partially
threaded in the end cap. Entirely remove the
other stop screw from the other end cap.
B. Open valve using air pressure. Note actuator will
leak due to removed travel stop.
C. Keeping air pressure applied to actuator, use the
indicator pointer on top of actuator to determine
if valve is open to desired position. If not, remove
air pressure and repeat steps 1-3, backing off or
screwing in stop screw to attain proper open
position of valve.
D. Make sure O-ring is in proper position in coun-
tersunk area on end cap and the washer is in
place.Tighten down nut to set stop position.
E. Thread in the other travel stop, making sure the O-
ring and washer are in the correct place. When the
travel stop will not thread any further, tighten nut
to set stop position.
F. The previous steps set the open travel stop. See
section 4.3.5 for instructions on setting the close
position stop.
5
SAFETY LOCKOUT DEVICE
1. Removal of stop cap screws:
A. Remove from the body both existing standard
stop cap screws (02) together with the nut (04),
washer (03) and O-ring (11) shown in
(Figure 4)
.
B. Insert on the special longer screw (226) and
standard stop cap screws (02) the special nut
(228), the washer (03) and the O-ring (11) shown
in
(Figure 20)
.
2. Assembly of stop cap screws:
A. Before inserting the special longer screw (226) or
the standard screw (02) into the actuator body,
check what stop position is required? If the stop
position is fully close (0˚) or fully open (90˚), see
(Figure 21)
. Note, when the stop screws are
inserted into the actuator body, the actuator
must be at the desired position.
B. Insert the special longer screw (226) and the
standard screw (02) into the actuator body until
the desired lock position is achieved then tighten
the special nut (228).
3. Assembly of safety cover and padlock:
A. Slide the safety cover (229) between the special
nut (226) and washer (03) on both the special
longer screw (226) and the standard screw (02)
as shown in
(Figure 22)
.
9
Figure 20
Special
Longer Screw (226)
Standard
Stop Cap
Screw (02)**
Washer (03)
** For model AT051 the Screw (02) is not standard and is included in the kit.
Special Nut (228)
O-Ring (11)
Figure 21
Special Longer Screw (226)
Standard Stop Cap Screw (02)
Standard Stop Cap Screw (02)
Special Longer Screw (226)
Top View
Top View
Special longer screw
position to lock in 0˚
(Close) position
Special longer screw
position to lock in 90˚
(Open) position
Figure 22
Special
Screw
Standard
Screw
Safety Cover
(229)
