Scotch Yoke Pneumatic Actuator

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Stainless Steel Scotch Yoke Pneumatic Actuator

Stainless Steel Scotch Yoke Pneumatic Actuator

The stainless steel scotch yoke pneumatic actuator is a high-end quarter-turn valve driving equipment specially developed for harsh working conditions of strong corrosion, high humidity, salt spray and high cleanliness.

Product Definition

The stainless steel scotch yoke pneumatic actuator is a high-end quarter-turn valve driving equipment specially developed for harsh working conditions of strong corrosion, high humidity, salt spray and high cleanliness. The main body adopts CF8 (304) and CF8M (316) full stainless steel precision casting technology, paired with a high-performance scotch yoke transmission structure, which can accurately convert compressed air power into 90° rotary torque. It is suitable for the switch and regulation control of quarter-turn valves such as ball valves, butterfly valves and plug valves. The product supports two structural forms: single-acting spring reset and double-acting bidirectional drive. It inherits the advantage of large variable torque output of scotch yoke actuators, and completely solves the pain points of ordinary cast iron actuators such as easy rust, corrosion, aging and medium pollution. It is widely used in high-end corrosion-resistant and high-cleanliness industrial scenarios such as marine shipping, chemical acid-base working conditions, food and pharmaceutical industry, water treatment purification, environmental protection and desulfurization, serving as the core special equipment for automatic valve control under harsh conditions.

Core Features

Full Stainless Steel Anti-Corrosion Structure: The whole machine shell, end cover, output shaft, yoke, pin shaft and fasteners are all made of food-grade/industrial-grade stainless steel with no risk of coating peeling. It features internal and external full corrosion resistance, and can withstand harsh environments such as acid-base corrosion, seawater salt spray and humid condensation for a long time.

Variable Torque Heavy-Duty Output: Adopting the classic scotch yoke mechanical transmission principle, it has the characteristics of high torque at the start and end of stroke and stable torque in the middle operation section. It has strong ability to break through the static resistance of valves, can stably drive large-diameter and high-load valves, and operates smoothly without impact or stalling.

High Cleanliness Without Medium Pollution: Integrally formed metal without paint surface and rust debris falling off, with smooth surface and easy cleaning. It fully meets the sterile, dust-free and impurity-free cleanliness requirements of food, pharmaceutical and pure water systems, avoiding secondary pollution of media.

Ultra-Long Service Life with Infrequent Maintenance: Stainless steel material features fatigue resistance, aging resistance and wear resistance, without cast iron oxidation and coating aging problems. The loss of core components is extremely low, enabling long-term continuous operation and greatly reducing the frequency of disassembly and maintenance.

Technical Parameters

Model

XM-B SERIES,XM-C SERIES

Material

304/316 stainless steel

Function

Double acting and Single acting(spring return)

Output Torque

The Output Torque of XM Spring Return type can be more than 140,000Nm, and Double Acting type more than 250,000Nm.

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. Extreme Corrosion Resistance for Harsh Conditions: Made of 304/316 stainless steel, it completely eliminates the problems of coating wear, peeling, rust and corrosion perforation of traditional painted cast iron actuators. It resists strong corrosive environments such as acid-base solutions, seawater salt spray and industrial moisture, with far better working condition adaptability than ordinary models.

 

2. High Cleanliness Grade Meeting Special Industry Standards: The integral stainless steel structure prevents impurity falling off, and can withstand high-temperature cleaning and chemical flushing. It complies with the specifications of high-cleanliness industries such as food processing, biopharmaceuticals, pure water purification and fine chemical industry, serving as special driving equipment for sterile and pollution-free processes.

 

3. Stable Mechanical Performance and Strong Anti-Attenuation Ability: Stainless steel material has high strength, good toughness, deformation resistance and fatigue resistance. Under long-term alternating high and low temperature and high-frequency start-stop working conditions, the torque output is not attenuated and the structure is not deformed, with far better operation consistency than ordinary anti-corrosion painted models.

 

4. Fully Upgraded Environmental Tolerance: Equipped with a fully sealed waterproof and dustproof structure with IP68 protection grade, combined with the anti-corrosion advantage of the stainless steel body, it can adapt to extreme and complex working conditions such as outdoor open-air, offshore and chemical corrosion workshops all weather.

FAQ

Q: What are the core differences between stainless steel scotch yoke actuators and ordinary cast iron scotch yoke actuators?

A:

The core differences lie in material anti-corrosion performance and applicable scenarios. Ordinary cast iron models rely on surface painting for anti-corrosion, and are prone to rust and corrosion once the coating is damaged, only suitable for conventional dry and non-corrosive working conditions. Stainless steel models have no coating and inherent anti-corrosion performance, with better acid and alkali resistance, salt spray resistance, higher cleanliness and longer service life. They are specially used for harsh corrosive, clean and high-end outdoor working conditions with no later anti-corrosion maintenance cost.

Q: How to choose between 304 and 316 stainless steel actuators?

A:

304 (CF8) stainless steel is preferred for conventional humid, dusty, ordinary water treatment and light food industry working conditions with higher cost performance; 316 (CF8M) stainless steel must be selected for high-corrosion working conditions such as marine salt spray, seawater contact, strong acid-base chemical industry and fine pharmaceutical industry. It has stronger corrosion resistance and can effectively resist corrosion caused by chloride ions and chemical media.

Q: Are stainless steel models divided into single-acting and double-acting types? What are the differences in applicable scenarios?

A:

There are two structural types. Stainless steel single-acting type: with spring reset, it automatically resets when air supply is cut off or pressure is lost, suitable for chemical emergency cutoff and gas anti-corrosion working conditions, focusing on fail-safe performance; Stainless steel double-acting type: bidirectional pneumatic drive without spring loss, with more stable high-frequency operation and longer service life, suitable for continuous regulation working conditions in pharmaceutical, pure water and marine industries.

Q: Will stainless steel actuators rust or corrode?

A:

Formal 304/316 stainless steel materials will not rust under normal working conditions. However, pitting corrosion may occur under extreme working conditions of high-concentration chloride ions, strong acid and alkali, and high temperature and high salt if the model is improperly selected. The corrosion problem can be completely avoided by matching the corresponding material model according to working conditions.

Q: Can stainless steel scotch yoke actuators be equipped with positioners for precise regulation?

A:

Absolutely yes. It can be matched with intelligent electro-pneumatic positioners and pneumatic positioners to realize 0–100% stepless precise opening adjustment. It has no coating peeling and rust jamming, with better adjustment linearity and repetition accuracy than ordinary anti-corrosion models, suitable for high-end fine chemical and pharmaceutical process control.

Q: What are the daily maintenance key points of stainless steel models?

A:

The maintenance is extremely simple with no need for repainting and anti-corrosion treatment. Routine inspection is conducted every 6 months for conventional conditions and every 3 months for harsh corrosive conditions. The key inspection points include air source cleanliness, seal air tightness, transmission part lubrication status and stroke accuracy. Only cleaning air source impurities is required with almost no consumable replacement cost.

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