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The various types of electric Actuators from Marsh have been developed specially for the quarter-turn operation of small
size butterfly, ball, plug valves and dampers. Thanks to their design simplicity to achieve low-cost automation. They are
provided with single phase motors which considerably saves the cost of electrical hardware and power consumption.
Also as the actuators are installed directly on final control element and are provided with stall-duty motors the units
become completely maintenance free that is Fit and Forget type. The units are supplied with all the necessary features to
operate the final control element in ONIOFF or Modulating modes. |
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| Technical Specifications : |
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| Actuator Data |
Models |
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QT-3 |
QT-5 |
QT-1O |
QT-20 |
QT-30 |
QT-40 |
QT-50 |
| Rated output torque kg m |
3 |
5 |
10 |
20 |
30 |
40 |
50 |
| Operation speed sec/90º |
18 |
18 |
20 |
20 |
26 |
26 |
26 |
Switching frequency Operations/hour
a) Short time
b) Normal |
1200
600 |
| Weight kg |
14 |
15 |
27 |
28 |
38 |
40 |
42 |
| Degree of protection |
IP65/IP67 |
| Area of operation |
Safe |
| Motor Data |
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| Type |
Non blocking A.C. Motor |
Supply Standard
Optional |
220 V AC 50 Hz Single Phase |
| 110 V AC 50 Hz Single Phase |
| Output Watts |
90 |
125 |
175 |
250 |
290 |
300 |
320 |
| Nominal Current Amp |
0.5 |
0.55 |
0.9 |
1.2 |
1.3 |
1.4 |
1.5 |
| Class of Insulation |
F |
| Ambient Temperature |
45º C |
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Actuator
Model |
Dimentional Details |
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E |
F |
ØG |
ØH |
ØJ |
K |
L |
M |
N |
P |
Q |
R |
ØS |
Mounting Holes
4H M6x12Deep on
50 PCB Off Centre
4H MBx12 Deep on
70 PCB Off Centre. |
| QT-3 |
32 |
175 |
108 |
30 |
100 |
70 |
235 |
70 |
220 |
33 |
140 |
22 |
100 |
| QT-5 |
32 |
175 |
108 |
30 |
100 |
70 |
255 |
70 |
220 |
33 |
140 |
22 |
100 |
| QT-10 |
37 |
245 |
108 |
30 |
100 |
93 |
380 |
63 |
240 |
33 |
186 |
17 |
125 |
4H M6x15Deep on
70 PCB Off Centre
4H M10x15 Deep on
102 PCD Off Centre. |
| QT-20 |
3 7 |
245 |
108 |
30 |
100 |
93 |
400 |
63 |
240 |
33 |
186 |
17 |
125 |
| QT-30 |
57 |
235 |
108 |
30 |
100 |
120 |
480 |
122.5 |
275 |
33 |
290 |
0 |
125 |
| QT-40 |
57 |
235 |
108 |
30 |
100 |
120 |
480 |
122.5 |
275 |
33 |
290 |
0 |
125 |
| QT-50 |
57 |
235 |
108 |
30 |
100 |
120 |
480 |
122.5 |
275 |
33 |
290 |
0 |
125 |
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Accessories :
Standard
• Limit switches (1NO+ 1NC) - 2Nos. (Rating 10 A - 250 VAC)
• Hand wheel
• Local postion indicator
• Adjustable mechanical stoppers
Optional
• Torque limit switches (1NO + 1NC)- 2Nos (for QT10 & QT20)
• Auxillary limit switches (1NO + 1NC) - 2 Nos.
• Three position switch for ON / OFF operation, Field / Panel Mounted
• Feed back Potentiometer
• Valve positioner - field/Panel mounted Input : 4 -2OmA/0 - 1OVDC.
Output : Proportional
• Two wire transmitter field/Panel mounted
Intput : From potentiometer in actuator - 100 to 235 ohms.
Output : 4 - 20 mA
• Remote position indicator - Digital
• Special accessories on request
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