Page 4 - Mobile_EN_WEB

APPLICATION FUNCTION

An electric high mast truck is a typical example of a hydrau-
POTATO HARVESTER lic lifting and lowering application. Lifting is usually carried
out directly via the built-in hydraulic pump, as the load coun-
teracts the direction of movement. For a controllable and
gentle lowering function, appropriate hydraulic valves are
used, which allow the oil to flow back into the tank in a con-
Potato harvesting is a globally essential process in the trolled manner via a bypass. In simple systems, this task
agricultural industry. To efficiently and effectively harvest is performed by a classic poppet valve. For more complex
undamaged potatoes, the use of a potato harvester hy- applications with increased requirements, load-compensa- COMPONENTS
ted proportional valves or load-compensated flow regulators
draulic system is crucial and plays a vital role in various are used. The design of the valve ensures that the lowering Various valves are available for the lowering movement.
aspects of the harvesting process where it is responsible speed is kept constant regardless of the load. These valves • Soft-closing poppet valve S2206-S1841
for powering the different components of the harvester, are also available in a seattight design. This ensures that
the fork remains in position when deenergized and does not
such as the motors, conveyors, diggers, ploughshears slowly lower due to leakage. • Proportional throttle valves DNPPM22 (25LPM) and DN-
PPM33 (63LPM)
(cutting blades) and separators while precisely adjusting
the machines operation to compensate for conditions • Load-compensated flow control valves QNPPM22 and
QNPPM33
and products being farmed.
• Leak-free flow control valves QSPPU10 and QSPPM33
These all-in-one valves control the lowering speed inde-
pendently of the load and are tight when deenergized. The
fork remains in position.

FUNCTION APPLICATION SPECIALTIES
The hydraulic system offers high power density and contribu- • With heavy loads, the system can tend to oscillate (boun-
tes significantly to the overall efficiency of the potato harves- cing effect), which can be absorbed and corrected with
ter, generating significant force and torque, enabling efficient STACKER internal valve changes
digging and the smooth lifting of potatoes from the ground
in various soil conditions, ensuring reduced bruising and a • For forklift trucks in potentially explosive atmospheres,
thorough and successful harvest. the valves can be Ex d-protected
Its ability to control and transmit the required speed and High speed and safety are important aspects • Valves with integrated electronics and connection to field-
power through precision low loss hydraulic valve products when lifting and lowering heavy loads effi- bus systems
allows for the design of smaller, more compact and light- ciently, especially for devices with a high lifting
weight machines, reducing energy consumption and increa- • Large valves in the M42 version can control flows of up
sing maneuverability, making the harvester more productive height. The high lifting and lowering speed re- to 200 l/min.
and cost-effective. quires smooth acceleration and deceleration
COMPONENTS behavior of the hydraulics to ensure precise
At the heart of the system are high quality hydraulic elec- and safe operation. All these characteristics
tro-proportional or ON/OFF valves that direct flow and pro-
portional or pre-set pressure valves for system safety or to can be adapted to the respective application
control the force needed for successful operation of a ma- by designing the hydraulic valve accordingly.
chine function. These valves can be flange or screw-in car-
tridge format, typically mounted in a manifold assembly or
provided as a sectional valve such as the Higher flow PMV or
the CMV(A) suited for lower flows and pressures.

SPECIALTIES
• Pilot flow to large flow control valves for cylinders, motors,
brakes etc.
• Full electro-hydraulic control of ON/OFF and proportional
products for remote control

• Mobile MD2 electronics interface to SAE J1939 data on
PTO RPM’s, and sensors
• Parameterization software for commissioning and
maintenance

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