|
Specification
| Order No.
| Compensator
| Structure
| Information
|
|
|
|
Control Type |
JIS Symbols |
Characteristics |
|
A
(A1~A4)：
Standard pressure compensator
|
 |
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. |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
GT：
Remote pressure
compensator
|
 |
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. |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
GP：
Remote Pressure compensator allows a pilot
valve & Load-sensing compensator
|
 |
|
none |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
GA：
Remote Pressure compensator allows a pilot
valve
|
 |
|
none |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
GM：
Remote Pressure compensator allows a pilot
valve
|
 |
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. |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
GJ：
Layer Proportional pressure compensator
|
none |
|
none |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
GB：
2 pressure electrical selection
|
 |
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. |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
GR：
Electrical unloading
|
 |
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. |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
GC：
2 pressure+ electrical unloading
|
 |
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. |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
HL：
Load-sensing compensator
|
 |
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. |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
HM：
Load-sensing compensator
|
 |
|
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. |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
HA：
2-vavle load-sensing compensator
|
none |
|
none |
|
|
Control Type |
JIS Symbols |
Characteristics
|
|
HJ：
2-vavle load-sensing compensator
|
 |
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. |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
HK：
Proportional electro-hydraul ic load
sensing type
|
 |
|
none |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
HQ：
Load-sensing & Proportional flow control
|
 |
|
none |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
FV：
Proportionable displacement control
|
 |
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. |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
FR：
Proportionable displacement control with
pressure
|
 |
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.
|
|
|
Control Type |
JIS Symbols |
Characteristics |
|
FG：
Proportionable displacement control with
pressure control
|
 |
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. |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
PA□：
Horse power compensator
|
 |
|
none |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
PH□：
Horse power compensator pilot flow
external for load-sensing
|
 |
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. |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
PM□：
Horse power compensator pilot flow
internal pressur epilot valve included
|
 |
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. |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
PL□：
Horse power compensator, Load-sensing
compensator
|
 |
|
none |
|
|
Control Type |
JIS Symbols |
Characteristics |
|
PG□：
Horse power compensator pilot flow
internal
|
 |
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. |
|
|
|