VBPDE RUB double pilot operated check valves – hydraulic locks with a lock

VBPDE RUB type double pilot operated check valves serve a protective role in hydraulic systems, preventing uncontrolled cylinder movement in the event of a hose failure or a sudden pressure drop in the supply line. Their design integrates the check function with a mechanical lock that guarantees the maintenance of the actuator's set working position. Thanks to hydraulic control, the flow opens only when a control signal is applied, which serves as protection against the uncontrolled lowering of the load. These components are an essential element of systems in construction, agricultural, and forestry machinery, where the highest positional stability is required. The precise operation of the lock effectively eliminates the „creeping” effect of the cylinder under external loads.

Application and technical characteristics

VBPDE RUB valves are designed for use in power hydraulic systems where the working medium is mineral oil compliant with DIN 51524. These components show high resistance to nominal pressures up to 350 bar and cyclic dynamic loads, which is key in applications with variable load characteristics. The thermal resistance of the valve ranges from -20°C to +80°C, allowing for safe operation in various climatic conditions. The valve body, made of high-strength steel or spheroidal cast iron, ensures mounting rigidity and resistance to deformation. Inside is a hardened poppet that provides the tightness required for cooperation with double-acting cylinders. The use of the valve allows for a significant reduction in hydraulic shocks thanks to the optimal ratio of the control piston surface. For proper operation of the device, it is recommended to use oil filtration at a minimum level of 25 microns, which protects internal components from solid contaminants and extends the life of the seats. Each valve is tested for tightness in accordance with the highest technical standards.

Why choose our components?

• Minimization of internal leakage: Precisely machined valve seats perform well where installed hydraulic directional control valves do not provide sufficient tightness in the neutral state.
• Full compatibility: The valves are adapted to work with a wide range of hydraulic fittings, which shortens the time for assembly and modernization of the system.
• Predictable characteristics: A standardized pilot ratio guarantees smooth opening of the valve, even under high static loads on the cylinder.

Frequently Asked Questions (FAQ)

What is the reason for using a hydraulic lock in a cylinder circuit?

The main reason is to mechanically lock the cylinder in any position, which prevents its uncontrolled descent in the event of a hose failure or leakage in the control valve section.

How to choose the correct pilot ratio for VBPDE RUB?

The pilot ratio is selected based on the working pressure in the cylinder chambers and the maximum pilot pressure available in the system to ensure smooth valve opening without sudden pressure spikes.

Does the VBPDE RUB valve require regular maintenance?

The valve, as a maintenance-free component, does not require intervention, provided that the required oil cleanliness class (min. 25 µm) is maintained and periodic inspection of the system's connection tightness is performed.

Can this valve be mounted directly on the cylinder?

Yes, the design of VBPDE RUB valves allows for mounting directly at the cylinder port, which is recommended to minimize the volume of fluid between the lock and the piston, increasing the overall stiffness of the system.