Hydraulic directional control valves complete with quick couplings with a flow rate up to 40 l/min 

Hydraulic control valves with a capacity of 40 l/min are reliable control units dedicated to managing the flow of the working medium in power hydraulic systems with a lower demand for oil flow. They are widely used in agricultural and forestry machinery, as well as small construction units where high control over the operation of single-and double-acting cylinders is required. Their compact monoblock design allows for easy installation in machines with limited installation space. The use of high-strength cast iron guarantees stable operation under load and a long service life of all internal components.

Application and technical characteristics

The offered control valves operate in hydraulic systems powered by mineral oils, synthetic oils, and water-oil emulsions according to the ISO 4406 standard. The design of the devices allows for handling installations with an operating pressure of up to 250 bar, while maintaining a nominal flow rate of 40 l/min. The working sections are equipped with precisely fitted spools, which effectively minimizes internal leakage and prevents uncontrolled load dropping. The manual lever control mechanism is professionally protected against dust and moisture ingress, enabling trouble-free operation in harsh environmental conditions. In installations where rapid dynamic pressure spikes occur, it is recommended to use additional safety valves (overload valves), which protect the pump and the control valve itself from the effects of overloads. In order to maintain high flow efficiency, the hydraulic system should always be protected by appropriate hydraulic filters of the required filtration accuracy.

Why choose our components?

Our control units are characterized by high repeatability of operating parameters, which is technically essential when designing systems requiring a constant operating speed of the receivers. Each control valve undergoes factory leakage tests at static pressure, which eliminates the risk of failure immediately after installation in the system. Thanks to the use of standardized connection threads, integration with other hydraulic fittings is fast and does not require complicated adapters. For the installation of rigid sections of the system cooperating with the valve, we recommend our pipe and hose clamps, which effectively reduce mechanical vibrations transmitted to the body of the device. Our components provide an optimal price-to-operational-life ratio, which translates into a real reduction in machine service costs.

Technical specification

Frequently Asked Questions (FAQ)

How to choose the right number of sections in a control valve?

The number of sections depends on the number of receivers (cylinders) being operated. One spare section should be added if the system requires handling additional tools or if future expansion is planned.

Can a 40 l/min control valve be used with a pump of higher capacity?

Using a pump with a capacity significantly exceeding 40 l/min will cause an increase in pressure drops across the valve, leading to excessive oil heating. A control valve with a nominal flow rate close to the pump capacity should be selected.

Can the control valve spools be replaced individually?

In case of mechanical damage to the spool or the body housing, it is recommended to replace the entire block or section, as spools are precision-lapped to a specific body during the manufacturing process.

What oil is recommended for operation with these control valves?

Hydraulic oils with a viscosity consistent with the machine manufacturer's requirements and operating temperature ranges should be used, typically of the HL or HLP class (e.g., ISO VG 32 or 46).