Flow rate up to 140L/min

6/2 Hydraulic Solenoid Valves (24V, 140 l/min) – High-performance main bus directional control valves

High-flow 6/2 hydraulic solenoid valves with a nominal flow rate of up to 140 l/min and 24V DC coil control voltage represent a segment of advanced executive components dedicated to operating under extreme machine loads. Designed as six-way, two-position devices, these valves serve for immediate, remote splitting or redirection of the main working fluid flow to two separate executive systems. Thanks to the electromagnetic spool shifting from the operator panel, the installation eliminates the mechanical need for additional sections of the main directional control valve. This directly translates into significant savings in mounting space, a drastic reduction in the weight of the valve block, and a reduction in points exposed to potential leaks. The 24V voltage characteristic predestines this group of products for trouble-free implementation in the supply lines of heavy construction, mining, and transport equipment, as well as in automated industrial lines.

Application and technical characteristics

6/2 solenoid valves adapted for flow at the level of 140 l/min are subjected to strict fatigue strength control due to the powerful hydrodynamic forces generated by the working medium. The monoblock body, cast from modified spheroidal cast iron with increased tensile strength, maintains full dimensional stability at dynamic pressures reaching 315 bar. The internal spool undergoes a thermal hardening process and is then honed with strict micron tolerance, which minimizes edge leakage between working chambers.

These components exhibit full chemical and mechanical resistance to mineral hydraulic oils of classes HL, HLP, and HVLP, as defined by the ISO 6743/4 standard. A wide operating temperature range (from -30°C to +90°C) allows for stable maintenance of fluid viscosity even in extremely difficult environmental conditions. 24V DC electromagnetic coils are mounted in insulation class H and protection degree IP65 according to the EN 60529 standard, which guarantees total tightness against moisture, dust, and aggressive chemical substances.

Main implementation areas of 6/2 24V 140 l/min solenoid valves:

• Heavy construction and mining machinery: Switching high-tonnage hydraulic power between traction circuits and working attachments (e.g., demolition hammers, scrap shears, powerful deep-drilling rigs).
• Large truck cranes and specialized vehicles: Managing the main pump flow when alternately powering boom telescoping sections and stabilizing outrigger systems with powerful lifting capacity.
• Industrial hydraulics: Automated high-tonnage press systems, smelting furnace loading systems, and large-scale stationary power units where hydraulic directional control valves of the main bus require rapid support in fluid flow transmission.

With such high flow parameters, the fundamental condition for maintaining the service life of the spool-body pair is the absolute filtration of solid contaminants. An efficient and correctly selected hydraulic filter constitutes a barrier protecting the valve's internal structure from seizure.

Why choose our components? Technical advantage

All high-flow 140 l/min solenoid valves offered by Hydron are manufactured based on rigorous DIN and ISO standards, confirming their highest geometric repeatability. Working ports (standard BSP 3/4" or BSP 1" internal threads) are cut according to the ISO 228/1 specification, enabling the safe transmission of powerful tightening torques. To avoid cavitation and critical pressure losses at narrowings, it is recommended to use only professional, high-flow hydraulic fittings with a triple elastomer seal. 24V coils are characterized by optimal thermal characteristics under continuous current load (ED 100%), eliminating the risk of a drop in electromagnet force. The valve design is also equipped with an integrated, mechanical emergency control pin, which allows for manual forcing of the spool position change in conditions of lack of electrical power.

Technical specification of the 6/2 24V 140L solenoid valve

Frequently Asked Questions (FAQ)

1. What engineering consequences will occur when installing a 140 l/min valve in an installation with a pump output of 180 l/min?
Forcing the flow of working fluid above the nominal design limit of 140 l/min generates a drastic increase in hydraulic resistance, resulting in a massive pressure buildup and a significant energy drop across the valve. These losses are directly transformed into heat energy, causing rapid overheating of the hydraulic oil, a drop in its viscosity, and accelerated thermal degradation of the seals. Additionally, extremely high hydrodynamic forces acting on the spool face can balance or completely block the magnetic field force generated by the 24V coil, preventing stable circuit shifting.

2. Why is external drainage absolutely required for flows of 140 l/min?
With such large volumes of displaced oil, natural internal leakages entering the clearance between the spool and the spring chambers generate high hydrostatic pressure. If the drain port is not connected by a separate line directly to the non-pressurized tank, the accumulated medium will cause a hydraulic lock of the spool, preventing the coil from moving it. Excessive pressure in the spring chamber will also lead to an immediate rupture of the internal dynamic seals and permanent damage to the component.

3. How do voltage drops in the 24V network affect the operating stability of a high-flow valve?
The value of the magnetic force generated by the coil's electromagnet to overcome the resistance of the return spring and the pressure of the 140 l/min fluid stream is strictly dependent on the intensity of the flowing current. A drop in the supply voltage in the machine's electrical system below 20V DC will significantly weaken the magnetic field. As a result, the spool will not fully open the flow channels, causing rapid throttling of the oil flow, system overheating, and unstable, jerky operation of connected actuators or hydraulic motors.

4. How to correctly integrate a 6/2 140 l/min solenoid valve into a series system with a main directional control valve?
The two supply (input) ports of the 6/2 solenoid valve should be connected using hoses with a sufficiently large internal diameter to the working outputs (A and B) of the selected section of the superior directional control valve. The four output ports of the divider are split in pairs to two target executive devices. In the de-energized state, the oil stream is factory-directed to the first pair of outputs. Applying 24V to the coil causes an immediate shift of the spool, which fully redirects the pump output to the second pair of output connections, enabling independent control of another machine function.