Instruction and maintenance manual – Marwin Valve UT Series Pneumatic Actuators User Manual
Page 8
INSTRUCTION AND MAINTENANCE MANUAL
MARWIN UT DESIGN 2011 PNEUMATIC ACTUATORS
Page 8 of 10
Bulletin IM-UT Dsgn2011_1114
3170 Wasson Road * Cincinnati, OH 45209 USA
Phone 513-533-5600 * Fax 513-871-0105
e-mail:
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8.2
Assembling UT-7 and UT-7.5
CAUTION: It is recommended to use suitable safety equipment during the handling for maintenance because of heavy and / or bulky parts.
1. Before assembling clean all components preferably with degreaser.
2.
Place the pinion (2) on a support with a square of the same size of the female attachment. Make sure that the pinion is provided with
lower O-ring (3), spacer (5) and upper O-ring (4). Lubricate the O-rings (see arrows Fig. 19).
The recommended lubricating grease is “KLUBER” TRIBO STAR 1EP“
3. Lay the cylinder (1) down on the pinion (2) (see Fig. 20).
4. Fit on the pinion (2) the spacer (17), the washer (18), and the snap ring (19) (see Fig. 21).
5. Remove the cylinder with pinion from the support and lay it on one base to mount the plate (7) with antifriction ring (6), (holes for adjusting screws
on the same side as the NAMUR attachments) then screw down the fastening screws (11) with washer (8) in crossed sequence (see Fig. 22), and
place the cylinder on the support again.
6. Grease the internal chamber of the cylinder (1) and both pistons (12) provided with O-ring (20) antifriction ring (21) anti blowout key (24)
and thrust block (16) - The recommended lubricating grease is “KLUBER” TRIBO STAR 1EP“.
7.
Rotate the cylinder (1) by approximately 50° to the upper slot of the pinion (see Fig. 23).
8. For the standard execution (clockwise pinion rotation looking at top when pistons travel toward each other) press the pistons (12) into the cylinder
(1) while turning the cylinder (1) in counterclockwise direction ( top view) until the pistons come into contact (see Fig. 23, 24).
9. Introduce the adjustment screws (10) with nut (9) into the plate (7) to adjust the travel stop (see Fig. 25 and paragraph 9).
10. For DOUBLE ACTING ACTUATOR: Mount the end cap (15) with O-ring (22-23) and gasket (23) on the cylinder and screw down in crossed
sequence the screws (25), see Fig. 18. Repeat the operation on the opposite side.
For SPRING RETURN ACTUATOR: Introduce the spring set (13) into the cylinder (1) and center them on the piston (12), then mount the caps
(15) with O-ring (22-2) centered on the springs (13). Note: the pistons have to be in CLOSED
(contracted) position. Tighten the screws (14) a little at a time in a crossed sequence, compressing the
springs uniformly, until the cap (15) is completely closed (see Fig. 26). Repeat the operation on the
opposite side.
11. Execute some test cycles to check the correct functioning of the actuator before installing it.
19
18
1
17
4
6
7
2
3
5
2
Fig. 19
Fig. 20
Fig. 21
Fig. 22
8
11
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12
1
14
15
15
22
9
23
1
12
7
10
Fig. 23
Fig. 24
Fig. 25
Fig. 26
Drilling