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Positive Conclusion for
Valve Concept

 

The LVS family of distributing valves features
high stability of flow rate controls.

 
 

The proportional distributing valves of the LVS series for mobile machine applications have stood up to the challenge of extensive daily operations.

Its improved construction allows the LVS valve by Bucher Hydraulics to achieve an unprecedented perfection of flow rate control stability. After several years of market experience with LVS, a positive conclusion can be drawn.The expectations of minimizing pressure losses, reducing vibration, and increasing stability were absolutely fulfilled.

The heart of the valves is the newly designed pressure balance valve, which keeps the differential pressure constant through the valve orifice. Usually, design engineers use the damping nozzle to optimize stability inside the valve. However, there are limitations here regarding the accumulation of dirt or the reaction times inside the valve. Therefore, Bucher Hydraulics tried something new.

The oil jet is optimally conducted through an intricate arrangement of logically connected channels at the inlet and outlet edges of the slide valves, allowing for a stable balancing of forces in any position. In connection with the aforementioned pressure balance valve, this leads to a strong reduction of stress. Manufacturers of vehicles therefore benefit from a simplified adjustment of lowering brake valves, which they like to employ for stabilizing their hydraulic motions.

Compared to conventional hydraulics concepts, the hydraulic stability of the LVS valve by Bucher Hydraulics is such that manufacturers of machines can do without additional damping elements for the most part.

When looking at the big picture, it should not be forgotten that the new LVS proportional control valve system has an extremely large slide valve diameter. The result: the relationship between the control forces and friction forces in the valve is so good that the slide hysteresis is far smaller than average, especially for the pilot-controlled valve versions. A default section can include any two completely independent flow regulating functions. This frees additional valuable space for the vehicle manufacturer. A pressure control can also be realized and additional secondary pressure control valves (shock valves) with a feeding function can be integrated.

 
 

Permitted loads:

 

  • LVS08 pump: 250 bar, consumer: 280 bar,
    return: 50 bar static (200 bar optionally).

  • LVS12 pump: 350 bar, consumer: 400 bar,
    return: 50 bar static (200 bar optionally).

 
 

Permitted flow rates:

 

  • Nominal flow rate, open-center systems = 200 l/min

  • Nominal flow rate, closed-center systems = 260 l/min

  • Nominal flow rate A and B to T = 300 l/min

 
 

Triggering types:

 

  • Direct actuation through switching magnet (On-Off)

  • Direct actuation through proportional magnet

  • Actuation through hand lever

  • Hydraulic actuators

  • Electrohydraulic pilot control

  • Digital pilot head with on-board electronics