Is the Hydraulic Actuator Suitable for High Temperature & Corrosive Working Environment?

Why Harsh Condition Actuator Selection Is The Top Pain Point for Process Industry Engineers
We know actuator selection has always been the biggest headache for plant and automation engineers. Chemical plants, offshore drilling platforms and thermal power stations mostly operate under harsh complex conditions: high ambient temperature, corrosive chemical vapor and heavy salt fog. The most frequent question raised by our global clients is whether a standard hydraulic actuator can run stably and reliably in these extreme sites. Most customers will also compare its overall performance with common air actuator and pneumatic valve actuator before placing procurement orders. 

What Structural and Material Defects Limit Standard Hydraulic Actuator Performance in Extreme Conditions
A conventional industrial hydraulic actuator drives valve movement through hydraulic oil circulation and rubber sealing components. Most standard models adopt ordinary carbon steel for the outer shell by default, which brings two obvious inherent flaws for harsh working scenarios. Firstly, the internal hydraulic fluid will degrade and lose working performance rapidly under continuous high-temperature exposure. Secondly, carbon steel shells are prone to rapid electrochemical corrosion when contacting chemical vapor and salt-based corrosive media. Compared with the simple-structured air actuator, the hydraulic actuator is assembled with more precise internal parts. These delicate components are extremely vulnerable to medium erosion, which will cause unexpected pipeline system shutdown and production loss.

How High Temperature Affects The Operating Stability of Hydraulic Actuator and Air Actuator
A large number of our consulting clients care about the high-temperature tolerance limit of these two mainstream actuators. In actual field application above 80℃, hydraulic actuator and air actuator show totally different operating stability. High temperature will thin hydraulic oil and accelerate aging of internal seals of hydraulic actuators, further causing common faults including system pressure loss, valve position drift and decreased control accuracy — these are the most frequent complaints we received from hydraulic actuator end users. On the contrary, the air actuator has no liquid driving medium inside, so it performs much more stably under medium high-temperature environments. Our Belef technical team puts forward a critical reminder: neither type of actuator can maintain long-term normal operation above 180℃, unless equipped with customized high-temperature resistant accessories.

Corrosive Environment Performance Comparison: Hydraulic Actuator VS Pneumatic Butterfly Valve Actuator
For offshore platforms and chemical reaction workshops with strong corrosive media, anti-corrosion capability is the core evaluation index for actuator procurement. Summarizing our massive field application feedback, the pneumatic butterfly valve actuator has obvious competitive advantages in such scenarios. This valve-matched actuator is factory equipped with epoxy anti-corrosion coating and 304 stainless steel structural parts, specially designed for corrosive pipeline control working conditions. We always remind our global clients: never install unmodified standard hydraulic actuator in strong corrosive working areas. 

Practical Field Modification Solutions to Make Hydraulic Actuator Adapt to High-Temperature Corrosive Scenarios
Many clients ask us whether they need to completely replace all hydraulic actuators for their harsh condition projects. We conclude a set of simple, low-cost modification schemes to greatly improve the environmental adaptability of hydraulic actuator. You only need to replace standard seals with high-temperature fluororubber seals, upgrade the carbon steel shell to stainless steel housing, and install external waterproof and anti-corrosion protective covers. Besides, for low-load and non-precision valve control loops, our engineers strongly recommend replacing hydraulic actuators with standard pneumatic valve actuator. 

Final Practical Selection Guide: Match Hydraulic and Pneumatic Actuators With Target Working Scenarios
The unmodified standard hydraulic actuator is not applicable for long-term continuous operation under combined high-temperature and strong corrosive working conditions. Custom reinforced hydraulic actuators are your optimal choice for heavy-load, high-precision control tasks in harsh environments. The general air actuator is perfect for low-load, medium-temperature and non-corrosive auxiliary valve control. If you have specific on-site working parameter data, our professional Belef technical team can provide free one-on-one actuator model selection service for your project.

Belef Pneumatic Actuator Co., Ltd. is a large-scale enterprise integrating R&D, manufacturing, assembly, sales and full-life after-sales service. We provide a full lineup of reliable hydraulic actuator, air actuator and pneumatic valve actuator products for global industrial projects. If you have any actuator selection or customized demand for harsh working conditions, welcome to contact our professional team for free consultation and quotation anytime.