MT Series Pneumatic Diaphragm Actuator

The MT series pneumatic diaphragm actuator is designed with a single-spring or multi-spring structure, providing an axial output thrust. It is compact in structure, light in weight, small in size, performs highly, has a long service life, and delivers a significant output thrust. It is used in conjunction with GLOBE control valves, globe valves, and other straightstroke valves, facilitating a tight and easy valve closure.

Description

The MT series pneumatic diaphragm actuator is designed with a single-spring or multi-spring structure, providing an axial output thrust. It is compact in structure, light in weight, small in size, performs highly, has a long service life, and delivers a significant output thrust. It is used in conjunction with GLOBE control valves, globe valves, and other straightstroke valves, facilitating a tight and easy valve closure.

Working principle: The electrical signal from the control instrument, after being converted into air pressure by the positioner or solenoid valve, is input into the diaphragm chamber. This pressure acts on the diaphragm to generate thrust, causing the output shaft to move.

MT actuator has excellent versatility and interchangeability. In the field, the action mode can easily be reversed. by simply flipping the upper and lower diaphragm chambers, Its unique design, which requires no external air supply tubing, means air is supplied to the positioner and actuator through holes in the mounting bracket,eliminating the need for external tubing. Compared to traditional designs, this arrangement is more reliable and requires less space for control valves assembly. This method ensures a safe air supply to the actuator and significantly simplifies the assembly process of the positioner.

Model Selection

 

No Item Code Detailed explanaon of code Sizing case
1 Series MT Pneumac diaphragm actuator MT
2 Model 1 Effecve area of diaphragm: 100cm² 2
2 Effecve area of diaphragm: 320cm²
3 Effecve area of diaphragm: 720cm²
4 Effecve area of diaphragm: 1500cm²
3 Action type R Reverse action R
D Direct action
4
5 Temperature code None Standard type -29~70 (°C) L
L Low temperature type -40~70 (°C)
6 + + + +
7 Handwheel code None Without hand wheel S
S With top handwheel
Model specifications MT1/MT2/MT3/MT4
Action type Direct action ( D): The air pressure increases and the output shaft drops.
Reverse action (R): The air pressure increases and the output shaft rises.
Output force See table below
Stroke See table below
Air supply pressure 0.4~0.6MPa
Applicable media Compressed air, nitrogen
Ambient temperature Standard type :-29~70℃ Low temperature type:-40~70℃
Optional accessories Handwheel mechanism, positioner, air filter pressure reducing valve, solenoid valve, limit switch, etc.
Performance Hysteresis: < 1%FS Lineary: < ±1%FS
Output force of actuator
Model Effective area of the diaphragm cm2 Stroke(mm) Output force (N) Weight
Without Hand wheel With Hand wheel
MT1R 100 20 2000 8 15
MT1D 100 20 2000 8 15
MT2R 320 30 4800 18 28
MT2D 320 30 8000 18 28
MT3R 720 60 10000 46 65
MT3D 720 60 18000 46 65
MT4R 1500 100 13000 95 130
MT4D 1500 100 19500 95 130
1. MT1 actuator

MT SERIES PNEUMATIC DIAPHRAGM ACTUATOR Structure and Characteristics1

① Anti-loosening nut Structure
Prevent the push rod from loosening, and improve the stability of the connection

② Ultra-high fatigue strength diaphragm material
Service life >200,000 cycles, ensuring long-term maintenance-free operation for customers.

③ Gating nut connection structure
Tightly connected without gaps, easy to disassemble, high regulating precision and stability.

④ dust-proof sealing ring structure
Double sealing, long-lasting seal without external leakage

⑤ Ultra-long self-lubricating bearing guided structure
Smooth operation, without random movement, low friction and high operational precision

⑥ Single spring structure
Compact structure, occupies small space, large output force.

2. MT2 and MT3 actuators

MT SERIES PNEUMATIC DIAPHRAGM ACTUATOR Structure and Characteristics2

① Anti-loosening nut structure
Prevents the push rod from loosening, enhancing connection stability

② Ultra-high fatigue strength diaphragm material
Operational life of over 200,000 cycles, ensuring long maintenance-free periods for customers.

③ Dustproof sealing ring structure
Double sealing, long-lasting and leak-proof.

④ Opening and closing nut connection structure
Closely connected with no gaps, easy to disassemble, high adjustment precision, and high stability.

⑤ Built-in air intake hole structure
No external air source tubing required, reduces the space needed for positioner installation, and decreases the number of potential leak points, regulating more stable.

⑥ External threaded connection structure
Enables quick interchangeability between direct and reverse action,improving the efficiency of on-site change overs of operational modes for users.

⑦ Ultra-long self-lubricating bearing guide structure
Operates smoothly without creep, low friction, and high action type precision.

⑧ Embossed diaphragm cover structure
Enhances the pressure resistance of the diaphragm cover, and increases the output thrust of the actuator.

MT SERIES PNEUMATIC DIAPHRAGM ACTUATOR Overall Dimensions

Model A H
Without handwheel With Handwheel
MT1R 180 300 450
MT1D 180 300 450
MT2R 270 398 651
MT2D 270 398 651
MT3R 400 681 890
MT3D 400 681 890
MT4R 590 1100 1700
MT4D 590 1100 1700

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