Flow up to 20L/min
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Lever-controlled hydraulic directional control valves – capacity up to 20 l/min
Monoblock hydraulic directional control valves, adapted for a nominal flow of 20 l/min, are basic executive elements in power hydraulic systems with lower oil flow requirements. The task of these devices is to precisely change the direction of the working medium flow between the hydraulic pump and receivers such as single-and double-acting cylinders or hydraulic motors. The design based on manual lever control provides direct control over the machine's operation, eliminating the need for complex electronic systems. These units are used in agricultural and forestry machinery, as well as small workshop constructions where high efficiency and reliability are required during long hours of duty cycles.
Application and technical characteristics
The offered directional control valves are designed for operation in installations reaching working pressures up to 250 bar in supply ports (P) and receiver ports (A, B). The bodies of the devices are made of ductile iron, which ensures high resistance to mechanical deformation under the influence of internal pressure and assembly stresses. The components are fully compatible with hydraulic oils meeting the DIN 51524 standard, including HLP and HVLP type fluids with kinematic viscosity in the range from 10 to 460 cSt. The permissible operating temperature range is from -20°C to +80°C, which enables failure-free use in variable environmental conditions.
A technical requirement for maintaining the durability of the device is to maintain the cleanliness class of the working medium in accordance with the ISO 4406 standard, which significantly reduces the risk of abrasion inside the block and the phenomenon of spool seizing. To protect the system against solid contaminants, it is necessary to install efficient hydraulic filters on the return line. Standard BSPP threaded connections guarantee leak-proof integration with system fittings, enabling safe connection of hoses using proven hydraulic couplings.
Why choose our components?
The choice of our directional control valves is based on engineering precision – each spool is fitted with micron tolerance, which minimizes internal leakage and guarantees a stable position of the receiver. The direct-acting relief valves used allow for accurate setting of the working pressure in accordance with the technical requirements of a specific application, which protects the system against the effects of sudden pressure spikes. The solid housing minimizes the risk of fatigue cracks, which is important for dynamically changing loads during machine operation. The user has full access to technical documentation and professional service maintenance, allowing for long-term maintenance of the technical efficiency of the entire system.
Technical specification
| Technical parameter | Value |
|---|---|
| Nominal flow | 20 l/min |
| Maximum pressure (P, A, B ports) | 250 bar |
| Maximum pressure on return (T) | 50 bar |
| Medium temperature range | -20°C to +80°C |
| Oil viscosity | 10 - 460 cSt |
| Body material | Ductile iron |
Frequently Asked Questions (FAQ)
1. Can a 20 l/min directional control valve work with a pump with a capacity of 40 l/min? Using a pump with a capacity that is too high relative to the flow capabilities of the directional control valve causes a dangerous increase in pressure losses and overheating of the oil in the system. This leads to the degradation of the lubricant properties of the medium and accelerated wear of the spool surfaces.
2. How often should the lever seals be replaced? The frequency depends on the operating conditions and the oil cleanliness class. If leakage is observed under the lever covers, we recommend checking the condition of the spool pins and potentially submitting the device for professional verification at our service center.
3. Does the relief valve require adjustment before the first startup? Yes, the relief valve must be adjusted to the working pressure of the specific system, and this value must be lower than the maximum pressure allowed for the pumps and receivers used. Adjustment should be performed using an external pressure gauge connected to the supply line P.