A Low temperatures increase oil viscosity, reducing flow and slowing cylinder speed. Seals become hard and brittle, risking leakage. Solutions include using low-temperature hydraulic oil with a low pour point, selecting cold-resistant seals such as polyurethane or nitrile rubber, and preheating the cylinder and oil before startup to ensure normal operation.

A High-temperature cylinders use heat-resistant materials such as alloy steel barrels and fluorocarbon (FKM) seals. Heat dissipation is enhanced by increasing cooling surface area or adding cooling devices. High-temperature hydraulic oil prevents fluid degradation. Piston rod surface protection prevents oxidation. These measures maintain sealing integrity and structural strength in hot environments.

A Select heat-resistant seals such as FKM and compatible high-temperature hydraulic oil. Use heat-resistant alloy steel for the barrel, add external insulation shields, and strengthen the cooling system. Monitor oil temperature regularly. Shorten seal and oil replacement intervals due to accelerated aging at elevated temperatures.

A For low temperatures, use HV-46 low-temperature oil with a pour point below -54°C and silicone rubber seals that remain flexible. For high temperatures, add spiral cooling water channels on the barrel and apply zirconia ceramic thermal barrier coatings. Testing shows cylinders can start within 10 minutes at -50°C and run continuously for 24 hours at 120°C without leakage.

A Electric heating wraps on the oil tank maintain the temperature between 20–40°C. Use HV-32 low-temperature oil with a pour point below -40°C. A pre-start circulation cycle runs a small gear pump for about 5 minutes to warm the oil before switching to the main pump. This ensures smooth startup and prevents cavitation damage.

A Strengthened guide rings made of bronze-based material are added on both sides of the piston, increasing load-bearing capacity. Self-lubricating spherical bearings at the rod end allow angular misalignment. Reinforcing ribs are welded to the barrel exterior to improve bending stiffness. These measures reduce barrel deformation under eccentric load and extend seal life.

A In mining and chemical environments, electrical components must use Exd IIC T4 explosion-proof enclosures with IP67 protection. Hydraulic components use non-sparking materials such as stainless steel valve bodies and copper-based friction pairs. Static electricity protection requires grounding resistance below 1 ohm and anti-static hydraulic oil with surface resistivity below 10⁹ ohms. Certification involves submitting designs to the national explosion-proof testing center, passing simulated explosion tests in methane atmospheres, and obtaining the Ex certification mark.

A Use hydraulic oil with a low pour point to prevent solidification. Select low-temperature-resistant seals such as polyurethane or nitrile rubber to avoid cold embrittlement and cracking. Preheat the cylinder and oil before startup. Apply cold-proof insulation to equipment. Ensure all components are rated for the expected minimum operating temperature.

A Choose oil with a low pour point, at least 10°C below the minimum expected ambient temperature. HV or HS type hydraulic oils with high viscosity index are preferred as they flow better at low temperatures while maintaining adequate viscosity at operating temperature. Synthetic oils may be necessary for extreme cold below -40°C to ensure pump suction and proper lubrication.

A Spiral water cooling channels can be machined or welded onto the cylinder barrel exterior, with water flow of at least 5 L/min. External air-cooled or water-cooled heat exchangers on the return line reduce oil temperature. Thermal barrier coatings such as zirconia ceramic reflect radiant heat. Insulation shields protect against external heat sources. Adequate reservoir size and ventilation also aid passive cooling.