A A non-standard hydraulic system is custom-designed and built according to specific customer requirements, hydraulic schematics, or functional descriptions, rather than selecting a pre-engineered standard system. It can incorporate special features such as synchronous control of multiple actuators, explosion-proof certification for hazardous environments, or integrated electrical control systems with remote operation capability. The system can be designed and manufactured together with custom hydraulic cylinders and electrical controls as a complete package. These systems are widely used in light textile, automotive, agricultural, construction, metallurgical, and machine tool industries where standard solutions cannot fully meet unique performance, space, or environmental demands.

A Custom systems offer three key advantages. First, precise performance matching—pump, valve, and cylinder parameters are tailored to the actual load, speed, and pressure requirements, avoiding the energy waste of oversized standard systems or the inadequate performance of undersized ones. Second, higher space utilization—integrated manifold blocks, customized reservoir shapes, and optimized layouts fit tight or irregular installation spaces. Third, greater functional flexibility—features like speed control, pressure holding, synchronization, and explosion protection can be incorporated for complex operating conditions. They are ideal for specialized heavy machinery, non-standard automated production lines, equipment in harsh environments, high-precision applications, and retrofitting older equipment.

A Four categories of parameters are essential. Operating condition parameters: core equipment motions, load magnitudes including peak and rated values, cycle periods, and continuous operating time. Performance parameters: rated and maximum working pressure, flow requirements, motion speeds, control precision including positioning and synchronization accuracy, and pressure holding requirements. Installation parameters: available length, width, and height, mounting orientation, and connection port locations. Environmental parameters: ambient temperature range, humidity, dust level, presence of corrosive media, explosion-proof requirements with the relevant classification, and power supply specifications such as voltage and frequency. These parameters directly determine component selection, structural design, and material choices; errors or omissions can lead to installation difficulties, performance shortfalls, or premature failures in harsh environments.

A Component selection follows three principles: match the operating conditions, prioritize reliability, and balance cost. For pumps, match rated pressure and flow to the system with 10–20% reserve capacity; use piston pumps for high pressure above 21 MPa, vane or gear pumps for medium and low pressure below 16 MPa, variable-displacement pumps for fluctuating loads, and fixed-displacement pumps for constant loads. For valves, ensure rated pressure and port size exceed system requirements; use proportional or servo valves for high-precision control and solenoid directional valves for general applications. For cylinders, calculate bore and rod diameter from the load, allow 5–10% stroke reserve, and select mounting style to match load direction. Avoid selection errors by basing decisions on calculated requirements rather than estimates, using standardized components from reputable brands, and communicating special conditions clearly with the manufacturer.

A Energy-saving design reduces waste and improves efficiency through component selection, system layout, and control strategy. Use high-efficiency components such as load-sensing or constant-power variable-displacement pumps instead of fixed-displacement pumps to match output to demand, and high-efficiency motors with variable-frequency drives to adjust pump speed. Optimize oil circuit design by using integrated manifold blocks to shorten flow paths and reduce resistance, and avoid unnecessary throttling losses. Apply energy-saving control strategies: load-sensing control for fluctuating loads, variable-frequency control for adjustable-speed applications, and accumulators for intermittent operations to store energy during low-demand periods and release it during peak demand. Strengthen cooling to maintain oil temperature between 30–55°C and select low-viscosity, high-wear-resistance hydraulic oil. Combined appropriately, these measures can reduce energy consumption by 15–30%.

A Several methods exist, each with trade-offs. Mechanical synchronization using shafts or gear racks is simple, low-cost, and reliable but offers lower accuracy above 2% error and suits short-stroke, moderate-load applications. Flow divider valves distribute oil flow evenly to multiple actuators; simple and moderately priced with 1–2% accuracy, but performance degrades with uneven loads. Electro-hydraulic proportional or servo valve closed-loop control uses position sensors and a PLC or dedicated controller to precisely regulate flow to each actuator, achieving accuracy below 0.5% error; it handles fluctuating loads well but costs 2–3 times more and requires clean oil. Volumetric synchronization using matched motors or pump groups provides good 0.5–1% accuracy and stability for large flow applications but is costly and demands precise manufacturing. Selection depends on the required accuracy, load characteristics, and budget.

A The reservoir must be customized for volume, structure, and material. Volume is typically 3–4 times pump flow per minute for small systems and 5–7 times for large systems, with additional capacity for high-temperature or continuous-duty conditions. Structure should fit the available space with internal baffles separating the suction and return zones to extend oil circulation, promote particle settling, and help air release. A drain port at the lowest point and a cleaning access port are essential. Material is usually Q235 welded steel plate for standard applications, with stainless steel for high-temperature or corrosive environments; internal surfaces must be derusted and phosphated. A sealed design with a desiccant air breather prevents moisture and dust ingress. The suction inlet should be at least 100 mm above the tank bottom, and the return outlet should be submerged and directed toward the tank wall to reduce foaming.

A For high-temperature environments above 60°C, select heat-resistant seals such as fluoroelastomer rated -20°C to 200°C, high-temperature hydraulic oil, and components rated for elevated service. Strengthen heat dissipation with larger radiators or water-cooled heat exchangers, increase reservoir volume, and install temperature monitoring with automatic cooling activation or alarms. For high-dust environments, use fully sealed reservoirs with efficient air breathers, double-seal piston rods with dust wiper and main seal, and multi-stage filtration with suction, pressure, and return-line filters. Simplified external structures using integrated manifold blocks minimize dust-trapping crevices. For corrosive atmospheres, use stainless steel tanks, piping, and components or apply protective coatings. For vibrating conditions, select vibration-resistant components and use flexible hose connections.

A Commissioning proceeds in four phases. Preparation: verify all piping connections, seal installation, correct oil type and level, electrical wiring, and sensor function, then clear the area and set safety signage. No-load testing: start the pump and run unloaded for 5–10 minutes checking for smooth operation and abnormal noise; cycle each actuator without load to confirm smooth motion; verify unloaded pressure is normal; check all connections for leaks; test cooling and filtration systems. Load testing: gradually increase from 30% to 100% of rated load while monitoring pressure and flow; test actuator speed, positioning, and synchronization accuracy; check pressure holding performance; observe system stability under peak load and component temperature rise. Optimization: adjust valve parameters, piping layout, or control programs to resolve any issues; retest until all specifications are met; document final settings and prepare a commissioning report with operating parameters and maintenance notes.

A The schedule is based on operating intensity, environment, and component characteristics. Light duty—under 8 hours daily in clean, stable conditions: oil change every 6–12 months, filter change every 3–6 months, comprehensive inspection monthly. Medium duty—8–12 hours daily in normal conditions: oil change every 3–6 months, filter change every 1–3 months, inspection biweekly. Heavy duty—over 12 hours daily, high-temperature, dusty, or fluctuating loads: oil change every 1–3 months, filter change every 2–4 weeks, inspection weekly. Daily checks include oil level and appearance, pump and motor noise and temperature, valve and fitting leaks, actuator motion smoothness, and cooling system function. Shorten intervals in harsh environments, inspect explosion-proof components regularly, and maintain detailed maintenance records for trend analysis.