Comprehensive Architecture and System Components

Each hydraulic system is custom-designed to optimally meet the parameters required by the specific technological process. These integrated systems comprise:

• Hydraulic Power Units (HPUs) – the core of the system, consisting of oil reservoirs in various capacities (ranging from compact solutions to large-scale tanks), pump groups (gear, piston, or vane pumps), and electric motors or internal combustion engines.
• Manifold Blocks and Accumulator Stations – centralized configurations of functional blocks and plates with integrated valve assemblies and directional control valves, alongside hydropneumatic accumulator stations (bladder or piston types) used for energy storage or pulsation dampening.
• Fluid Conditioning Systems – integrated filtration units (return, pressure, filling, and off-line/bypass filters) as well as cooling (oil-air or oil-water coolers) and heating systems that guarantee the maintenance of the optimum oil cleanliness class and operating temperature.
• Control and Instrumentation Systems (I&C) – comprehensive instrumentation including level, temperature, and pressure sensors, as well as oil cleanliness monitors, all interfacing with control cabinets and PLC controllers.

Specialized and Custom Implementations

Engineering and manufacturing capabilities allow for the delivery of systems capable of operating under extremely harsh environmental conditions:

• Mining and Explosion-Proof Systems – installations designed in compliance with the ATEX directive, adapted for underground mining operations (methane and dust hazard zones) and the chemical industry, often powered by water-glycol fluids or fire-resistant hydraulic fluids (HFC, HFDU).
• Lubrication and Centralized Lubrication Systems – dedicated systems responsible for the continuous supply of lubricant to the bearings and gears of large rotating machinery.
• Large-Scale Industrial Installations – extensive piping systems, drive installations for industrial presses, metallurgical equipment, or lifting mechanisms for locks and weirs in hydro-engineering facilities.

Every system undergoes rigorous testing procedures on test benches to verify tightness, efficiency, and full compliance with specified pressure and flow parameters. This ensures maximum reliability, energy efficiency, and complete repeatability of the operating cycles within the final installation.

Structural Diversity and Mounting Configurations

Depending on the specific requirements of the designed or serviced hydraulic system, the product range encompasses various design types:

• Subplate mounted valves – featuring port configurations fully compliant with the widely recognized international CETOP standards.
• Threaded (in-line) valves – designed for direct installation within hydraulic lines, offering high installation flexibility (can be mounted in any working position) with connecting threads such as M18x1.5, M22x1.5, G3/8, or G1/2.
• Sectional valves – allowing for the modular configuration of control systems.
• Cartridge valves – dedicated for compact installation inside hydraulic manifold blocks.

Advanced Control Methods and Functional Variations

To ensure seamless integration with automation systems and manual overrides, these directional control valves are available in multiple actuation and monitoring options:

• Direct and pilot-operated designs – including electrically controlled solutions (e.g., the popular WE, IWE, and WN series), electro-hydraulic, as well as mechanically (roller) and manually (lever or knob) actuated variants.
• Proportional systems – proportional control models, including versions equipped with integrated digital electronics (type USAP/USAEP) and spool position monitoring sensors.
• Specialized and safety executions – intrinsically safe valves meeting ATEX directives, dedicated for operation in potentially explosive atmospheres (e.g., in underground mining).
• Integration of auxiliary functions – selected components come factory-equipped with cross-over relief valves, relief-check valves, or pressure adjustment capabilities in the actuator ports (A and B), along with manual emergency override buttons.

All supplied products are engineered to operate across a wide range of maximum flow rates and working pressures ensuring full repeatability of parameters and high operational tightness of the system.

Functional Classification and Applications

Depending on the specific task within the system structure, the product range encompasses a comprehensive selection of advanced valve designs:

• Pressure Control Valves – essential for system protection and stabilization. This group includes safety and relief valves (e.g., DB, DBD types) that protect the system against overload, pressure reducing valves (e.g., DR type) that maintain a constant downstream pressure, and sequence or accumulator disconnect valves (e.g., DA, DZ types) that control the order of hydraulic operations.
• Flow Control Valves – designed for precise management of actuator speeds. They include throttle valves (e.g., MG, MK types) and advanced flow control regulators (2-way and 3-way), which guarantee a constant flow rate regardless of pressure fluctuations (load changes) in the system.
• Check and Shut-off Valves – ensuring free fluid flow in one direction and complete isolation in the opposite direction. This group features standard check valves (e.g., S, RK types), pilot-operated check valves (single and double hydraulic locks that prevent loads from dropping), and ball shut-off valves.

Structural Variations and Mounting Configurations

To provide maximum design flexibility, PONAR Wadowice valves are manufactured in various mounting configurations, allowing for seamless integration into any application type:

• Subplate mounting – compliant with international ISO/CETOP standards, enabling the construction of manifold block systems.
• Sandwich (modular) mounting – allowing for economical and compact vertical stacking of valves directly beneath directional control valves.
• Threaded (in-line) mounting – for direct installation into hydraulic pipelines using threaded ports.
• Cartridge (screw-in) mounting – dedicated for space-saving installation within custom-machined hydraulic manifold blocks.

Actuation and Specialized Executions

The product line comprises both direct-operated and pilot-operated components, which can be actuated mechanically, manually, or electrically. The portfolio also includes advanced proportional valves (controlling pressure or flow via electrical current signals) as well as specialized executions – including intrinsically safe versions with ATEX certification, engineered for safe operation in environments with potential dust and gas explosion hazards.

All valves are designed to operate across extensive ranges of working pressures ($p_{max}$) and flow capacities ($Q_{max}$), ensuring minimal flow resistance, high sealing integrity, and extended operational lifetime.

Filtration and Cooling – Fluid Conditioning

Maintaining the correct cleanliness class and proper operating temperature of the hydraulic fluid are critical factors governing the lifetime of the entire system:

• Filtration Systems – including filler, suction, pressure, and return filters, as well as advanced off-line (bypass) filtration units. They are responsible for the continuous removal of solid contaminants from the oil, protecting high-precision valve elements from premature wear.
• Hydraulic Oil Coolers – heat exchangers (air-to-oil and water-to-oil variants) designed for thermal stabilization of the system. They effectively dissipate excess heat generated during intensive machinery operations, preventing oil overheating and the subsequent loss of lubricating properties.

Hydropneumatic Accumulators and Safety Manifolds

Engineered for storing the potential energy of pressurized fluids and dampening pulsations within the hydraulic circuit:

• Hydraulic Accumulators – available in bladder, diaphragm, and piston configurations. They act as an emergency energy reserve, assist pump groups during peak flow demands, and absorb hydraulic shocks (water hammer effects).
• Accumulator Safety and Shut-off Blocks – specialized valve manifolds that enable safe integration of the accumulator into the circuit, allowing for manual or electrical pressure relief (depressurization) and protecting the accumulator against exceeding the maximum working pressure ($p_{max}$).

Control Electronics and Auxiliary Instrumentation

Modern hydraulics require seamless integration with industrial automation architectures and comprehensive monitoring instrumentation:

• Control Cards and Amplifier Modules – digital and analog electronic modules (available for DIN-rail mounting or as plug-in connectors directly on solenoids) dedicated to the precise management of proportional valves. They ensure optimum regulation of current characteristics and the execution of closed-loop feedback control.
• Auxiliary Instrumentation – control, measurement, and mounting accessories, including pressure gauges (manometers), pressure switches (pressure stats), temperature and oil level sensors, as well as subplates and installation manifolds.

Hydraulic Quick-Disconnect Couplings

Connecting components engineered for efficient, repeated, and leak-free connection and disconnection of hydraulic lines without the use of tools. Available in various structural designs (e.g., poppet type, leak-free flat-face type), they guarantee absolute sealing integrity and minimal flow resistance ($Q$) at the coupling joint.

Structural Classification and Operational Characteristics

The product range includes highly engineered solutions tailored to diverse kinematic requirements of industrial installations:

• Hydraulic Cylinders (Linear Actuators) – converting fluid energy into reciprocating linear motion. The portfolio encompasses piston-type cylinders (both single- and double-acting) as well as plunger cylinders. They feature a wide selection of bore and rod diameters, alongside variable stroke lengths, enabling the generation of forces reaching multiple tons.
• Hydraulic Motors (Rotary Drives) – transforming fluid pressure energy into the rotary motion of an output shaft. Depending on the required rotational speed and torque output, various designs are utilized (such as piston or orbital motors), which excel in driving mobile machinery, winches, conveyors, or mixers.

Mounting Options and Custom Configurations

To ensure mounting versatility within various mechanical structures of machinery, linear actuators are manufactured with different types of rod ends and bearing support configurations:

• Spherical and Swivel Mountings – rod ends and cylinder bases equipped with spherical bearings, ideal for compensating angular misalignments.
• Rigid Mountings – front or rear mounting flanges, feet, and lugs, ensuring a stable, fixed positioning within the machine frame.
• Trunnion Mountings – transverse pivot pins (trunnions) integrated directly with the cylinder tube.

Advanced Features and Specialized Executions

To meet the demands of modern industrial automation and harsh environmental conditions, the drives can be equipped with advanced auxiliary functionalities:

• Position Measurement Systems – cylinders fitted with integrated internal linear transducers (position sensors), allowing for precise interaction with proportional valves in closed-loop feedback systems.
• End-Position Cushioning – damping systems that eliminate piston impact against the cylinder head or cap, extending the mechanical lifetime of the entire kinematic joint.
• Executions for Aggressive Environments – drives featuring specialized protective rod coatings (e.g., multi-layer chrome, nickel-chrome plating) and dedicated sealing packages, engineered to operate under high working pressures ($p_{max}$), extreme temperatures, or in contact with fire-resistant fluids.

Product Range and Technical Parameters

The ecoHYD product line offers a diverse selection of hydraulic valves and auxiliary elements with specific operational ratings:

• Pressure and Flow Control Valves – including threaded single and dual relief valves (EHVR type) operating at pressures up to 350 bar and flow rates up to 90 dm³/min, threaded sequence valves (EHVQ type), and flow control regulators (EHVF type, up to 210 dm³/min). The range is complemented by 50:50 flow dividers (EHVFD type) as well as throttle and throttle-check valves (EHRF type).
• Isolation and Check Valves – including single threaded check valves (EHVUR type, with flow rates up to 450 dm³/min), pilot-operated check valves (EHVBPS type), and hydraulic pilot-operated check valves / locks (EHVB type) available in threaded and subplate-mounted versions.
• Cartridge Components – compact cartridge relief valves (EHCVR type) and cartridge check valves (EHCVC type), characterized by high flow capacities (up to 320 dm³/min).
• Specialized Valves – including overcenter/counterbalance valves (EHVC type) in threaded and subplate-mounted versions compatible with CETOP3 (WE6) and CETOP5 (WE10) standards, subplate dual overcenter valves (EHVCDM type), multi-way directional valves and high-pressure valves (EHVD, EHVDDFA types), as well as dedicated solenoids/coils (EHC type).
• Diaphragm Accumulators – MDA-type components with capacities ranging from 0.075 to 3.5 liters, engineered for maximum working pressures up to 330 bar.
• Industrial and Mobile Oil Coolers – devices designed for heat dissipation in hydraulic oil systems. Available variants include industrial versions (EHFTS type) with a cooling capacity from 0.07 to 0.68 kW/°C and mobile versions (EHFTT type) achieving a cooling capacity from 0.09 to 0.9 kW/°C.

All products within the ecoHYD series are strictly parameterized regarding maximum pressure, flow rate, and thermal efficiency, allowing for a precise match with the budget and design specifications of the hydraulic system.