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Control Type |
JIS Symbols |
Characteristics |
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A
(A1~A4)：
Standard pressure compensator
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The
standard pressure compensator adjusts the pump
displacement according to the actual need of the
system in order to keep the pressure constant.
As long as the system pressure at outlet port P is
lower than the set pressure (set as spring preload
of the compensator spring) the working port A of the
compensator valve is connected to the case drain and
the piston area is unloaded. Bias spring and system
pressure on the annulus area keep the pump at full
displacement.
When the system pressure reaches the set pressure
the compensator valve spool connects port P1 to A
and builds up a pressure at the servo piston
resulting in a down stroking of the pump. The
displacement of the pump is controlled in order to
match the flow requirement of the system. |
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Control Type |
JIS Symbols |
Characteristics |
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GT：
Remote pressure
compensator
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While at the
standard pressure compensator the pressure is set
directly at the compensator spring, the setting of
the remote pressure compensator can be achieved by
any suitable pilot pressure valve connected to pilot
port PP . The pilot flow supply is internal through
the valve spool.
The pilot flow is 1-1.5 l/min. The pilot valve can
be installed remote from the pump in some distance.
That allows pressure setting e.g. from the control
panel of the machine. The remote pressure
compensator typically responds faster and more
precisely than the standard pressure compensator and
is able to solve instability problems that may occur
with a standard pressure compensator in critical
applications.
The pressure pilot valve can also be electronically
controlled (proportional pressure valve) or combined
with a directional control valve for low pressure
standby operation. |
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Control Type |
JIS Symbols |
Characteristics |
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GP：
Remote
Pressure compensator allows a pilot valve &
Load-sensing compensator
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none |
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Control Type |
JIS Symbols |
Characteristics |
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GA：
Remote
Pressure compensator allows a pilot valve
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none |
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Control Type |
JIS Symbols |
Characteristics |
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GM：
Remote
Pressure compensator allows a pilot valve
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Version GM of the remote
pressure compensator provides on its top side an
interface NG6, DIN24340 (CETOP 03 at RP35H, NFPA
D03).
This interface allows a direct mounting of a pilot
valve. Beside manual or electrohydraulic operated
valves it is also possible to mount complete
multiple pressure circuits directly on the
compensator body. YEOSHE offers a variety of these
compensator accessories ready to install. All remote
pressure compensator have a factory setting of 15
bar differential pressure. With this setting, the
controlled pressure at the pump outlet is higher
than the pressure controlled by the pilot valve. |
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Control Type |
JIS Symbols |
Characteristics |
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GJ：
Layer
Proportional pressure compensator
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none
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none |
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Control Type |
JIS Symbols |
Characteristics |
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GB：
2
pressure electrical selection
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PV pump with fast response
remote pressure control, relief valve with 2
pressure stages, electrical pressure selection,
nitrile seals, spindle adjustment, 24 VDC solenoid,
plug to DIN 46350 accessories fitted.
Usable for horsepower control and proportional
volume control, too. |
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Control Type |
JIS Symbols |
Characteristics |
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GR：
Electrical unloading
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PV pump with fast response
remote pressure control, relief valve with 2
pressure stages, electrical pressure selection,
nitrile seals, spindle adjustment, 24 VDC solenoid,
plug to DIN 46350 accessories fitted.
Usable for horsepower control and proportional
volume control, too. |
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Control Type |
JIS Symbols |
Characteristics |
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GC：
2
pressure+ electrical unloading
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PV pump with fast response
remote pressure control, relief valve with 2
pressure stages, electrical pressure selection,
nitrile seals, spindle adjustment, 24 VDC solenoid,
plug to DIN 46350 accessories fitted.
Usable for horsepower control and proportional
volume control, too. |
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Control Type |
JIS Symbols |
Characteristics |
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HL：
Load-sensing compensator
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The load-sensing compensator
has an external pilot pressure supply. Factory
setting for the differential pressure is 10 bar. The
input signal to the compensator is the differential
pressure at a main stream resistor. A load-sensing
compensator represents mainly a flow control for the
pump output flow, because the compensator keeps the
pressure drop at the main stream resistor constant.
A variable input speed or a varying load (-pressure)
has consequently no influence on the output flow of
the pump and speed of the actuator.
By adding a pilot orifice (ψ0.8mm)and a pressure
pilot valve pressure compensation can be added to
the flow control function. See the circuit diagram
below, left. |
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Control Type |
JIS Symbols |
Characteristics |
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HM：
Load-sensing compensator
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Shown above is load sensing
compensator code HM with an NG6 interface on top of
the control valve. That allows direct mounting of a
pilot valve for pressure compensation. This version
includes the pilot orifice. Due to the interaction
of flow and pressure compensation this package has
not the “ideal” control characteristic. The
deviation is caused by the pilot valves
characteristic. |
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Control Type |
JIS Symbols |
Characteristics |
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HA：
2-vavle load-sensing compensator
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none
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none |
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Control Type |
JIS Symbols |
Characteristics
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HJ：
2-vavle load-sensing compensator
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If a more accurate pressure
compensation is required, the 2-valve load-sensing
compensator code HJ can be used. The circuit diagram
of this version is shown left.
Here the interaction of the two control functions is
avoided by using two separate control valves for
flow and pressure compensation.
The 2-valve compensator is equipped with an
interface NG6 on the compensators top side. |
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Control Type |
JIS Symbols |
Characteristics |
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HK：
Proportional electro-hydraul ic load sensing type
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none |
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Control Type |
JIS Symbols |
Characteristics |
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HQ：
Load-sensing & Proportional flow control
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none |
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Control Type |
JIS Symbols |
Characteristics |
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FV：
Proportionable displacement control
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The proportional displacement
control allows the adjustment of the pumps output
flow with an electrical input signal.
The electronic control compares permanently input
command and actual displacement and powers the
proportional solenoid of the control valve. A
deviation from the commanded displacement leads to a
modulation of the input current to the solenoid. The
control valve then changes the control pressure
(port A) unit the correct displacement is adjusted.
Version FV of the proportional control does not
provide a pressure compensation. The hydraulic
circuit must be protected by a pressure relief
valve. |
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Control Type |
JIS Symbols |
Characteristics |
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FR：
Proportionable displacement control with pressure
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In version FR an additional
pressure compensator valve can override the
electrohydraulic displacement control. That adds
pressure compensation to this control.
The compensator valve has an NG6/D03 interface on
top to mount a pressure pilot valve. When using a
proportional pressure pilot valve an
electro-hydraulic p/Q-control can be realized. The
electronic driver modules are tuned for the valve
types DSAE1007P07KLAF or RE06M35W2NXP to give best
performance.
The electronic control module PQ0*-P.. (see opposite
page) contains, beside the displacement control
unit, also the driver electronics for the a.m.
proportional pressure valves. |
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Control Type |
JIS Symbols |
Characteristics |
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FG：
Proportionable displacement control with pressure
control
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With ordering code FG the
proportional pressure pilot valve and a pressure
transducer (YEOSHE SCP 8181 CE) are included with
the pump control. In combination with control module
PQ0*-Q.. a closed loop pressure control of the pump
outlet pressure is available. Module PQ0*-L.. offers
an electronic horse power limiter in addition to the
closed loop pressure control.
YEOSHE variable displacement pumps have a large
servo piston. That leads to a extremely robust and
stable pump control. On the other hand that requires
high control flows (up to >100 l/min). YEOSHE has
therefore chosen the 2-valve-p/Q-control concept,
because in this case a hydraulic mechanical
compensator valve takes care of the pressure
compensation of the pump. That allows a very fast
pressure compensation and makes this the control
unsensitive to fluid contamination. We see the
2-valve-concept as a contribution to system and
pressure control safet. |
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Control Type |
JIS Symbols |
Characteristics |
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PA□：
Horse
power compensator
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none |
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Control Type |
JIS Symbols |
Characteristics |
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PH□：
Horse
power compensator pilot flow external for
load-sensing
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The hydraulic-mechanical horse
power compensator consists of a modified remote
pressure compensator (Code PG*、PM*) or of a modified
load-sensing compensator (Code PH*) and a pilot
valve. This pilot valve is integrated into the pump
and is adjusted by a cam sleeve. The cam sleeve has
a contour that is designed and machined for the
individual displacement and the nominal horse power
setting.
At a large displacement the opening pressure (given
by the cam sleeve diameter) is lower than at small
displacements. This makes the pump compensate along
a constant horse power (torque) curve.
For all nominal powers of standard electrical motors
YEOSHE offers a dedicated cam sleeve. The exchange
of this cam sleeve (e.g.: to change horse power
setting) can easily be done without disassembly of
the pump.
On top of that an adjustment of the horse power
setting can be done within certain limits by
adjustment the preload of the pilot control
cartridge spring. That allows an adjustment of a
constant horse power setting for other than the
nominal speeds (1500 min-1) or for other horse
powers. |
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Control Type |
JIS Symbols |
Characteristics |
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PM□：
Horse
power compensator pilot flow internal pressur epilot
valve included
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The hydraulic-mechanical horse
power compensator consists of a modified remote
pressure compensator (Code PG*、PM*) or of a modified
load-sensing compensator (Code PH*) and a pilot
valve. This pilot valve is integrated into the pump
and is adjusted by a cam sleeve. The cam sleeve has
a contour that is designed and machined for the
individual displacement and the nominal horse power
setting.
At a large displacement the opening pressure (given
by the cam sleeve diameter) is lower than at small
displacements. This makes the pump compensate along
a constant horse power (torque) curve.
For all nominal powers of standard electrical motors
YEOSHE offers a dedicated cam sleeve. The exchange
of this cam sleeve (e.g.: to change horse power
setting) can easily be done without disassembly of
the pump.
On top of that an adjustment of the horse power
setting can be done within certain limits by
adjustment the preload of the pilot control
cartridge spring. That allows an adjustment of a
constant horse power setting for other than the
nominal speeds (1500 min-1) or for other horse
powers. |
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Control Type |
JIS Symbols |
Characteristics |
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PL□：
Horse
power compensator, Load-sensing compensator
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none |
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Control Type |
JIS Symbols |
Characteristics |
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PG□：
Horse
power compensator pilot flow internal
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The hydraulic-mechanical horse
power compensator consists of a modified remote
pressure compensator (Code PG*、PM*) or of a modified
load-sensing compensator (Code PH*) and a pilot
valve. This pilot valve is integrated into the pump
and is adjusted by a cam sleeve. The cam sleeve has
a contour that is designed and machined for the
individual displacement and the nominal horse power
setting.
At a large displacement the opening pressure (given
by the cam sleeve diameter) is lower than at small
displacements. This makes the pump compensate along
a constant horse power (torque) curve.
For all nominal powers of standard electrical motors
YEOSHE offers a dedicated cam sleeve. The exchange
of this cam sleeve (e.g.: to change horse power
setting) can easily be done without disassembly of
the pump.
On top of that an adjustment of the horse power
setting can be done within certain limits by
adjustment the preload of the pilot control
cartridge spring. That allows an adjustment of a
constant horse power setting for other than the
nominal speeds (1500 min-1) or for other horse
powers. |
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