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.

MT Series Pneumatic Diaphragm Actuator

Description

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.

Video

Product Advantage

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
3	Action type	D	Direct action	R
4	–	–	–	–
5	Temperature code	None	Standard type -29~70 (°C)	L
5	Temperature code	L	Low temperature type -40~70 (°C)	L
6	+	+	+	+
7	Handwheel code	None	Without hand wheel	S
7	Handwheel code	S	With top handwheel	S

Typical Applicaon Scenarios

Technical Parameters

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

Performance

Output force of actuator

Model	Effective area of the diaphragm cm2	Stroke(mm)	Output force (N)	Weight
Model	Effective area of the diaphragm cm2	Stroke(mm)	Output force (N)	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

Typical Flow Characteristic Curve

Rated Cv and Travel

Maximum Closing Differential Pressure (MPa)

Dimensions and Weight

Model	A	H
Model	A	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

Structure and Characteristics

1. MT1 actuator

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

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.