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Customized Steam Turbine Hydraulic Actuator Piston Rod
During steam turbine governing system operation, the actuator piston rod serves as the core force-bearing transmission component. Its upper end connects to the pull rod via a spherical plain bearing, directly determining control valve action accuracy and overall operational stability. Excessive verticality installation error during on-site equipment installation can lead to multiple equipment hazards, shortened component service life, and compromised power generation safety.
Equipment Hazards from Verticality Deviation
The hydraulic actuator performs small-amplitude swinging motion through hinge pins during operation. If piston rod installation verticality requirements are not met, uneven loading occurs on the spherical plain bearing, and eccentric friction develops between piston and cylinder barrel. After prolonged operation, this leads to:
Scratches on piston rod surface and abnormal wear of sealing assemblies
Oil seepage and actuator leakage
Bending deformation of the valve stem
Vibration transmission to feedback levers and pilot valves
Reduced regulation precision of unit control valves
Unstable rotating speed during unit warm-up and potential protective interlock trips
Precision Control Measures for Verticality Installation
Multiple practical measures ensure installation accuracy during maintenance and installation:
Secure actuator cylinder base and adjust shims on supports to ensure perpendicularity between cylinder and valve beam
Evenly set pre-compression length of disc springs on both sides to minimize cylinder swinging amplitude
Strictly control assembly clearances of all parts
Maintain coaxial pin holes of spherical plain bearing for smooth hinge pin fitting
Avoid internal stress from forced assembly misalignment
Perform repeated measurements with spirit levels and dial indicators to eliminate tilting stress
High-Quality Piston Rod Selection
To fundamentally avoid piston rod bending and sealing part abrasion damage, high-quality actuator piston rods significantly improve service conditions:
Manufactured from high-strength quenched-and-tempered alloy steel with high structural rigidity and outstanding anti-bending performance
Precision polishing and hard-chrome plating surface finish for excellent wear and corrosion resistance during long-term reciprocating service
Matched with high-precision spherical plain bearings for superior fitting performance and effective lateral stress buffering
Widely applicable to various industrial turbine unit actuators, these rods mitigate component wear and reduce subsequent maintenance costs while maintaining standard operating verticality over extended service cycles.
