A Efficiency improvements focus on three areas. Leakage control uses laser cladding to repair scored bores, reducing leakage to as low as 0.01 ml/min, and optimizing seal groove dimensions for proper compression. Throttling optimization replaces throttle valves with electro-hydraulic proportional valves, cutting energy consumption by up to 30%, and adds back-pressure valves on return lines to recover potential energy. Friction reduction applies DLC (diamond-like carbon) coating on piston rods, lowering the friction coefficient to 0.05, and uses low-viscosity hydraulic oil while ensuring adequate lubrication.

A Intelligent upgrades combine sensors and IoT technology. Condition monitoring installs pressure, temperature, and displacement sensors to upload real-time operational data. Predictive maintenance uses machine learning algorithms to forecast seal life, providing early warnings up to two weeks before failure. Remote control enables operation via mobile apps for functions such as start, stop, and speed adjustment. These upgrades reduce unplanned downtime and enable data-driven maintenance decisions.

A Intelligent diagnosis systems use a multi-layer architecture. The sensor layer includes pressure sensors with high accuracy, vibration sensors measuring accelerations up to ±50g with 0–5 kHz frequency response, and acoustic emission sensors detecting ultrasonic signals from seal leaks. The data processing layer applies wavelet transforms to extract vibration characteristic frequencies and uses support vector machine (SVM) algorithms to classify fault types such as internal leakage, external leakage, and stick-slip motion. A web-based or mobile app platform pushes early warning alerts to maintenance personnel.

A Synchronization can be achieved mechanically, hydraulically, or electro-hydraulically. Mechanical methods use rigid linkages or rack-and-pinion systems with synchronization accuracy around ±1%, suitable where flexibility is less critical. Hydraulic methods employ flow divider valves with distribution error under 3% or synchronous motors with volumetric efficiency above 95%, though at higher cost. Electro-hydraulic methods use displacement sensors with PLC closed-loop control achieving accuracy within ±0.5 mm, ideal for high-precision applications such as press clamping and stage lifting platforms.

A Long-term synchronization can use a hydraulic synchronous motor circuit, where matched motors with identical dimensions and high machining precision distribute nearly equal flow to each cylinder. Synchronization accuracy depends primarily on motor and cylinder machining precision and load uniformity. Alternatively, a proportional valve closed-loop circuit uses servo cylinders with built-in displacement sensors or standard cylinders with external sensors. One valve signal serves as the reference, the other as the follower, achieving precise synchronization through continuous feedback correction. An equal-flow dual-pump system with a hydraulic servo compensation device can also detect and correct position errors between cylinders via a feedback linkage.

A Displacement sensors measure each cylinder's actual position in real time and feed data to a controller. The controller compares the positions of all cylinders and adjusts individual proportional valve signals to correct any deviation. This closed-loop control compensates for load differences, leakage, and manufacturing tolerances, maintaining synchronization accuracy within ±0.5 mm even under varying load conditions. Sensors can be magnetostrictive types embedded in the rod or external linear transducers mounted alongside the cylinder.

A Predictive maintenance continuously monitors parameters such as pressure, temperature, vibration, and displacement through installed sensors. Machine learning algorithms analyze historical and real-time data to establish normal operating baselines. When deviations exceed thresholds—such as increasing vibration indicating seal wear or rising temperature signaling increased friction—the system generates alerts. This allows maintenance to be scheduled before a failure occurs, reducing unplanned downtime and preventing secondary damage to connected components.

A Electro-hydraulic proportional valves precisely regulate flow in response to electrical command signals rather than fixed mechanical restrictions. This eliminates the energy wasted as heat in conventional throttling, reducing energy consumption by up to 30%. Proportional control also enables smoother acceleration and deceleration, improves positioning accuracy, and allows real-time adjustment of speed and force through the controller. These benefits make it ideal for applications requiring variable speed, precise positioning, and energy-efficient operation.

A Diamond-like carbon (DLC) coatings on piston rods provide an extremely hard, low-friction surface with a friction coefficient as low as 0.05, significantly reducing seal wear and operating temperature. The coating also offers excellent corrosion resistance, protecting the rod in harsh environments. Lower friction means less energy is lost as heat, improving overall system efficiency. DLC coatings extend seal life and maintenance intervals, making them valuable for high-cycle, high-performance applications where downtime is costly.

A Accumulators store pressurized fluid during low-demand periods or when a load is lowered by gravity. This stored energy is then released to assist the pump during peak demand or to power the next lifting stroke. By reducing the peak power required from the pump and motor, accumulators cut energy consumption and allow the use of a smaller, more efficient pump. They also absorb pressure shocks and pulsations, reducing stress on cylinders and piping. In applications with frequent start-stop or lifting-lowering cycles, accumulators can reduce energy use by 20–30%.