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Spring Return Scotch-yoke Pneumatic Rotary Actuator

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Product Definition

XM Scotch Yoke Pneumatic Actuators are fit for turn-off or metering control of 90° valves (such as ball valves,butterfly valves and plug valves).It can realize automatic control of industrial process with various accessories.The principle is that compressed air enters the chamber to push the piston to do linear motion,and by transmission structures of the yoke pin and yoke groove,the piston's linear motion will be converted into the yoke's rotary motion,and drives the output shaft to rotate, thus achieving the control of the valve.

Compared with traditional rack and pinion actuators, it features higher structural strength, larger output torque and stronger operational stability, adapting to long-term continuous operation requirements in harsh industrial environments.

Core Features

High-torque stable output

Single-acting spring reset design, safer

Solid structure, long service life

Fully sealed protection design, can operate stably all day long

Technical Parameters

Model	XM-B SERIES,XM-C SERIES
Material	Ductile iron or carbon steel
Function	Single acting(spring return)
Output Torque	More than 140000Nm
Working Pressure	0.3-0.6Mpa
Color	Red/Customized
Interface size	Compliant with NAMUR and ISO5211 standards
Operating temperature	Standard: -20°C to +80°C High temperature: -15°C to +150°C Low temperature: -40°C to +80°C

Technical Advantages

1. The central body module and cylinder module are all made of ductile iron or carbon steel to ensure enough strength.The overall structure is compact,with beautiful and coordinated design.The yoke and piston ensure the best torque output.

2. XM Series Scotch Yoke Pneumatic Actuator adopts a double O-ring seal and guide ring design, ensuring the stability and reliability of the cylinder module, with simple and convenient maintenance and replacement.

3. Two independent angle adjustable bolts can adjust the valve travel from -6° to 96°,assisting to prolong the valve seat integrity.

FAQ

Q: What are the core differences between single-acting and double-acting scotch yoke pneumatic actuators?

The core differences lie in reset mode and safety performance. The single-acting type adopts spring reset, which automatically returns to the safe position when air supply is cut off or pressure is lost, with fail-safe function, suitable for high-risk working conditions requiring safety interlock. The double-acting type adopts bidirectional air source drive without spring reset, featuring faster response speed and lower cost, suitable for conventional working conditions without air-cut safety risks.

Q: What are the common causes and solutions for abnormal reset failure?

Common causes include spring fatigue, corrosion or jamming, residual air pressure not exhausted, jamming of piston and scotch yoke transmission parts, and excessive stroke adjustment.
Solutions: Check and replace aging springs; exhaust residual air pressure in the cylinder; clean transmission impurities and add lubrication; fine-tune the stroke bolts to the standard range.

Q: Does the actuator support precise adjustment and positioner matching?

It supports precise working condition adjustment. It can be matched with pneumatic valve positioners and intelligent electro-pneumatic positioners to realize precise valve opening adjustment through signal control, with an adjustment accuracy of ±0.1%, meeting the requirements of refined process control.

Q: What is the daily maintenance cycle and key points?

Routine inspection is conducted every 6 months for conventional working conditions and every 3 months for harsh working conditions. Key inspection points: air source cleanliness, spring elasticity, wear of transmission parts, air tightness of seals and stroke accuracy. Clean the air filter regularly; frequent disassembly and maintenance are not required.

Q: How long is the warranty period?

One year quality warranty for free, and lifelong paid service.

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