Quarter Turn Actuators

QT series of electrical 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 other accessories.

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 necessary features to operate the final control element in ON/OFF or modulating modes.

Technical Data & Specifications
Actuator Data
Actuator Models
  QT-3 QT-5 QT-10 QT-20 QT-30 QT-40 QT-50
Rated Output Torque Kgm 3 5 10 20 30 40 50
Operating Speed Sec /90° 17 17 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  
Type Non-Blocking A. C. Motor
Supply : Standard
Optional
220V AC 50Hz Single Phase
110 - 415 V AC 50Hz
Output wattes 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 Insulation F
Ambient Temperature 45° C
Actuator Dimention Details
Actuator
Model
Dimensions Mounting Holes
4H M6 x12 Deep on
50 PCD Off Centre.
4H M8 x12 Deep on
70 PCD Off Centre.
E F øG øH øJ K L M N P Q R øS
QT-3 32 170 108 30 100 70 235 70 220 33 140 22 100
QT-5 32 170 108 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 M8 x15 Deep on
70 PCD Off Centre.
4H M10 x15 Deep on
102 PCD Off Centre.
QT-20 37 245 108 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 30 100 120 490 122.5 275 33 290 0 125
QT-50 57 235 108 30 100 120 500 122.5 275 33 290 0 125
Accessories
STANDARD

  • Limit Switches (1No.+1Nc) - 2 Nos. (Rating 10 A - 250 VAC)
  • Hand wheel
  • Local position indicator
  • Adjustable mechanical stoppers

OPTIONAL

  • Auxiliary limit switches - (1No + 1Nc) - 4 Nos.
  • Torque limit switches (1No + 1Nc) - 2 Nos (for QT10 onwards)
  • Three position switch for ON/OFF operation Field/Panel mounted
  • Feed back Potentiometer
  • Valve positioner - Field / Panel mounted Input : 4-20mA/0-10 V DC.
  • Output : Proportional
  • Two wire transmitter field /Panel mounted
  • Input : From potentiometer in actuator - 100 to 235 ohms or 0-1000 ohms
  • Output : 4-20 mA - Two wire
  • IP 67 Protection
  • Remote position indicator-Digital
  • Space heater
  • Special accessories on request


Connection Digram