Hydraulic control valves for open center systems 90 l/min 

Hydraulic control valves with a nominal flow rate of 90 l/min are advanced control units designed for power hydraulic systems with high demand for medium flow. Their Open Center design guarantees load-free oil flow to the tank in the neutral position, which is essential for maintaining thermal stability of the entire circuit. Thanks to precisely ground spools, these devices feature high internal sealing, directly translating to the precision of actuator operation under heavy operating conditions. This is an engineering solution dedicated to construction machinery, agricultural equipment, and high-power forestry attachments.

Application and technical characteristics

These components have been developed to operate at working pressures up to 350 bar. The body made of high-strength spheroidal cast iron ensures resistance to mechanical deformation, and the seals used are fully compatible with HL and HLP type mineral oils, in accordance with DIN 51524. Optimization of internal channels allowed for a significant reduction in pressure losses, positively impacting the energy efficiency of the system. In installations where real-time pressure monitoring is necessary, it is worth integrating into the system hydraulic pressure gauges, which allow for precise diagnostics of the pump and receivers.

In advanced applications where the 90 l/min control valve is a central control point, it is important to ensure proper filtration of the medium and protect the hoses against mechanical damage. To ensure long-lasting installation life, we recommend using high-quality hydraulic hose guards, which protect the system from aggressive working environments. In situations where there is a need to transport the medium over longer distances while maintaining full machine mobility, our control valves work perfectly with high-pressure hydraulic hoses with a high safety factor.

Why choose our components?

• High nominal flow rate: The design dedicated to 90 l/min allows for dynamic operation of fast cylinders without the occurrence of cavitation.
• Compliance with ISO standards: Products meet rigorous safety and quality standards for hydraulic components used in mobile machinery.
• Mounting flexibility: Standard threaded connections enable easy integration with existing systems without the need for costly modifications.
• High operating stability: The use of advanced centering springs ensures reliable return of spools to the neutral position after operation completion.

Frequently Asked Questions (FAQ)

1. Can a 90 l/min control valve work with a lower pump output?
Yes, it is permissible to work with pumps of lower capacity. The control valve does not impose the flow, but only handles it. However, it should be remembered that over-sizing the control valve relative to the pump is beneficial for reducing pressure losses.

2. What oil viscosity should be used for 90 l/min control valves?
Hydraulic oils with a nominal viscosity in the range of 10-460 mm²/s at operating temperature are recommended. Always select oil according to the machine manufacturer's recommendations and the safety data sheet of the specific device.

3. Does this control valve require an external pressure relief valve?
Most of our models have a built-in relief (safety) valve that protects the system against pressure increases above the set value. Before installation, always verify the setting of this valve in accordance with the design requirements of the system.