PONAR Wadowice participated in the project to modernize mechanical drives at the Rzeszów Water Barrage.
The Rzeszów Water Barrage is located on the Wisłok River, and its main task is to abstract water directly from the reservoir for the production of electric power. The barrage also serves as a bridge facilitating road traffic.
The barrage weir has four spans closed by gates equipped with movable ice flaps.
The modernization included the supply of automated hydraulic systems responsible for lifting the weir gates and cylinders for the ice flaps.
We designed hydraulic systems that allow for automatic operation, equipped with a measurement system and appropriate overload protections.
Due to limited access and the placement of the power units on control towers, each hydraulic power unit consists of 3 parts. The entire unit had to be assembled on site – the hydraulic tank (400 l with accessories), the power unit frame (with an integrated pump assembly, valves, and instrumentation/control), and the drip tray.
A valve block with 3 control sections was mounted on the power unit frame, comprising:
- WE type directional control valves responsible for controlling the direction of oil flow (the direction of movement of the actuator)
- UZPR type relief valves limiting the maximum pressure in the system within a given pressure line
- Z2S type pilot-operated check valves enabling free oil flow in one direction and automatically closing in the opposite direction, with the ability to open this flow using control pressure (protecting actuators against movement caused by external forces).
Furthermore, the system also incorporates:
- VRFU type throttle check valves enabling the adjustment of the flow rate in one direction and free flow in the opposite direction (adjustment of the movement speed of actuators)
- BKH type ball shut-off valves – blocking oil flow in a given line.
system technical data
| nominal tank capacity | 400 dm3 | type of working medium | hydraulic oil 20÷400 mm2/s | optimal medium viscosity | 20-35 mm2/s |
| main pump type | gear | nominal operating pressure | 15 MPa | filtration | 10 µm |
| main pump displacement | 16 cm3/rev. | valve coil voltage | 24 V – DC | ambient temperature | – 15÷35 °C |
| electric motor power | 7.5 kW | max. noise level | 85 dB(A) | optimal oil temperature | 40÷55 °C |
The supplied hydraulic cylinders are equipped with electronic piston rod extension measurement, which guarantees a measurement accuracy of min. 0.1 mm.
The piston rod and bearing eyes were made of stainless steel, and the cylinder itself was protected against corrosion with a special C5 paint coating.
cylinder technical data
| piston | 235 mm | stroke | 1400 mm |
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SALES DEPARTMENT – hydraulic systems
tel. +48 32 323 34 00 | e-mail: systemy@ponar-wadowice.pl
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