CN212028216U - Hydraulic control valve and variable displacement hydraulic pump with hydraulic control valve - Google Patents

Hydraulic control valve and variable displacement hydraulic pump with hydraulic control valve Download PDF

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CN212028216U
CN212028216U CN202020560982.0U CN202020560982U CN212028216U CN 212028216 U CN212028216 U CN 212028216U CN 202020560982 U CN202020560982 U CN 202020560982U CN 212028216 U CN212028216 U CN 212028216U
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valve
input
spool
output ports
port
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郑鑫
王立娟
金晖
范腾涛
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Danfoss Power Solutions Zhejiang Co Ltd
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Danfoss Power Solutions Zhejiang Co Ltd
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Abstract

本实用新型的实施例公开了一种液压控制阀和变排量液压泵。该液压控制阀包括阀体和阀芯。阀体包括：在阀腔的轴向方向上的一侧形成在阀体中并与阀腔连通的第一腔以及用于输出控制流体的第一输出口和第二输出口。阀芯能够相对于阀体处于第一位置，利用第一腔的第一压力从第一位置移动到第二位置，并且利用第一腔的大于第一压力的第二压力从第二位置移动到第三位置。在阀芯处于第一位置的情况下，输入通道与输出口断开，在阀芯处于第二位置的情况下，输入通道与第一输出口接通并与第二输出口断开，并且在阀芯处于第三位置的情况下，在保持输入通道与第一输出口接通的状态下，输入通道与第二输出口接通。该液压控制阀能够实现低超调功能。

Figure 202020560982

The embodiment of the utility model discloses a hydraulic control valve and a variable displacement hydraulic pump. The hydraulic control valve includes a valve body and a valve core. The valve body includes a first cavity formed in the valve body on one side in the axial direction of the valve cavity and communicated with the valve cavity, and a first output port and a second output port for outputting a control fluid. The spool can be in a first position relative to the valve body, move from the first position to the second position using a first pressure of the first chamber, and move from the second position to a second position using a second pressure of the first chamber that is greater than the first pressure third position. When the spool is in the first position, the input channel is disconnected from the output port, and when the spool is in the second position, the input channel is connected to the first output port and disconnected from the second output port, and in When the spool is in the third position, the input channel and the second output port are connected to each other while the input channel and the first output port are kept connected. The hydraulic control valve enables low overshoot function.

Figure 202020560982

Description

液压控制阀和具有液压控制阀的变排量液压泵Hydraulic control valve and variable displacement hydraulic pump with hydraulic control valve

技术领域technical field

本实用新型的实施例涉及一种液压控制阀和具有该液压控制阀的变排量液压泵。Embodiments of the present utility model relate to a hydraulic control valve and a variable displacement hydraulic pump having the hydraulic control valve.

背景技术Background technique

通常，变排量液压泵的流量由变排量液压泵的液压控制阀来控制。然而，当前的液压控制阀的响应较慢，且在调节过程中阀芯往往会产生较大的超调。Usually, the flow of the variable displacement hydraulic pump is controlled by the hydraulic control valve of the variable displacement hydraulic pump. However, the response of current hydraulic control valves is slow, and the spool tends to have a large overshoot during the adjustment process.

发明内容SUMMARY OF THE INVENTION

本实用新型的实施例的目的是提供一种液压控制阀和具有该液压控制阀的变排量液压泵，由此例如可以改善液压控制阀以及变排量液压泵的性能。An object of the embodiments of the present invention is to provide a hydraulic control valve and a variable displacement hydraulic pump having the same, whereby, for example, the performance of the hydraulic control valve and the variable displacement hydraulic pump can be improved.

本实用新型的实施例提供了一种液压控制阀，包括：阀体，所述阀体包括：在阀体中沿轴向方向延伸的阀腔；在阀腔的轴向方向上的一侧形成在阀体中并与阀腔连通的第一腔；用于输入流体的输入通道；以及用于输出控制流体的多个输出口，多个输出口包括第一输出口和第二输出口；以及阀芯，所述阀芯设置在阀体的阀腔中，其中：所述阀芯能够相对于阀体处于第一位置，利用所述第一腔的第一压力从第一位置在远离第一腔的方向上移动到第二位置，并且利用所述第一腔的大于第一压力的第二压力从第二位置在远离第一腔的方向上移动到第三位置，在阀芯处于第一位置的情况下，所述输入通道与多个输出口断开，在阀芯处于第二位置的情况下，所述输入通道与多个输出口中的第一输出口接通并与多个输出口中的第二输出口断开，并且在阀芯处于第三位置的情况下，在保持所述输入通道与多个输出口中的所述第一输出口接通的状态下，所述输入通道与多个输出口中的所述第二输出口接通。An embodiment of the present invention provides a hydraulic control valve, comprising: a valve body, the valve body includes: a valve cavity extending in an axial direction in the valve body; a valve cavity formed on one side in the axial direction of the valve cavity A first cavity in the valve body and in communication with the valve cavity; an input channel for inputting fluid; and a plurality of output ports for outputting control fluid, the plurality of output ports including a first output port and a second output port; and The valve core is arranged in the valve cavity of the valve body, wherein: the valve core can be in a first position relative to the valve body, and the first pressure of the first cavity is used to move away from the first position from the first position moving in the direction of the cavity to the second position, and using the second pressure of the first cavity that is greater than the first pressure to move from the second position to the third position in a direction away from the first cavity, when the spool is in the first position In the case of the position, the input channel is disconnected from the plurality of output ports, and when the valve core is in the second position, the input channel is connected with the first output port of the plurality of output ports and is connected with the plurality of output ports. The second output port is disconnected, and when the valve core is in the third position, the input channel is connected to the first output port of the plurality of output ports in a state where the input channel is kept connected The second one of the output ports is turned on.

根据本实用新型的实施例，自输入通道开始与第一输出口连通时起，至输入通道开始与第二输出口连通，阀芯的行程在0.01毫米到0.5毫米之间。According to the embodiment of the present invention, from when the input channel starts to communicate with the first output port, until the input channel starts to communicate with the second output port, the stroke of the valve core is between 0.01 mm and 0.5 mm.

根据本实用新型的实施例，所述阀体还包括用于将流体返回油箱的返回口，在阀芯处于第一位置的情况下，所述多个输出口中的第一输出口与返回口接通，并且在阀芯处于第二位置和第三位置的情况下，所述多个输出口中的第一输出口与返回口断开。According to an embodiment of the present invention, the valve body further includes a return port for returning the fluid to the oil tank, and when the valve core is in the first position, the first output port of the plurality of output ports is connected to the return port and when the spool is in the second position and the third position, the first output port among the plurality of output ports is disconnected from the return port.

根据本实用新型的实施例，所述的液压控制阀还包括：与所述输入通道连通的用于输入流体的输入口，其中：在阀芯处于第一位置的情况下，输入口与多个输出口断开，在阀芯处于第二位置的情况下，输入口与多个输出口中的第一输出口接通并与多个输出口中的第二输出口断开，并且在阀芯处于第三位置的情况下，在保持输入口与多个输出口中的所述第一输出口接通的状态下，输入口与多个输出口中的所述第二输出口接通。According to an embodiment of the present invention, the hydraulic control valve further comprises: an input port communicating with the input channel for inputting fluid, wherein: when the valve core is in the first position, the input port is connected to a plurality of The output port is disconnected, when the spool is in the second position, the input port is connected to the first output port of the plurality of output ports and disconnected from the second output port of the plurality of output ports, and when the spool is in the first position In the case of the three positions, the input port is connected to the second output port of the plurality of output ports while the input port is kept connected to the first output port of the plurality of output ports.

根据本实用新型的实施例，所述阀芯包括：朝向第一腔的第一端部；与第一端部相对的第二端部；从阀芯的第一端部轴向延伸到第一端部和第二端部之间的轴向孔；形成在阀芯的外周上的第一凹部和第二凹部；以及分别使轴向孔与第一凹部和第二凹部连通的第一连通孔和第二连通孔，所述第一凹部和第二凹部与所述阀体的阀腔的内壁分别形成第一工作腔和第二工作腔，所述输入口与第一工作腔连通，在阀芯处于第二位置的情况下，输入口通过第一工作腔与多个输出口中的第一输出口接通，并且在阀芯处于第三位置的情况下，在保持输入口通过第一工作腔与多个输出口中的第一输出口接通的状态下，输入口通过第一工作腔、第一连通孔、轴向孔、第二连通孔和第二工作腔与多个输出口中的所述第二输出口接通。According to an embodiment of the present invention, the valve core includes: a first end facing the first cavity; a second end opposite to the first end; axially extending from the first end of the valve core to the first end an axial hole between the end portion and the second end portion; a first recessed portion and a second recessed portion formed on the outer periphery of the valve core; and a first communication hole that communicates the axial hole with the first recessed portion and the second recessed portion, respectively and a second communication hole, the first and second concave parts and the inner wall of the valve cavity of the valve body respectively form a first working cavity and a second working cavity, the input port is communicated with the first working cavity, and the valve When the core is in the second position, the input port is connected to the first output port of the plurality of output ports through the first working chamber, and when the valve core is at the third position, the input port is maintained through the first working chamber In the state of being connected to the first output port of the plurality of output ports, the input port passes through the first working chamber, the first communication hole, the axial hole, the second communication hole and the second working chamber and the said outlet of the plurality of output ports. The second output port is on.

根据本实用新型的实施例，所述输入口通过第一工作腔、第一连通孔和轴向孔与所述第一腔连通。According to an embodiment of the present invention, the input port communicates with the first cavity through a first working cavity, a first communication hole and an axial hole.

根据本实用新型的实施例，所述阀体还包括在阀腔的轴向方向上的另一侧形成在阀体中并与阀腔连通的第二腔，并且所述液压控制阀还包括：弹簧，所述弹簧设置在阀体的第二腔中，用于朝向阀体的第一腔推动所述阀芯，并且所述阀芯能够相对于阀体在所述弹簧的推动下朝向所述第一腔移动到第一位置。According to an embodiment of the present invention, the valve body further includes a second cavity formed in the valve body on the other side in the axial direction of the valve cavity and communicated with the valve cavity, and the hydraulic control valve further includes: a spring, the spring is provided in the second cavity of the valve body for pushing the valve core toward the first cavity of the valve body, and the valve core can move toward the valve body relative to the valve body under the pushing of the spring The first cavity is moved to the first position.

根据本实用新型的实施例，所述的液压控制阀还包括：与所述输入通道连通并通向所述阀腔的多个输入口，多个输入口包括第一输入口和第二输入口，在阀芯处于第一位置的情况下，多个输入口与多个输出口断开，在阀芯处于第二位置的情况下，多个输入口中的第一输入口与多个输出口中的第一输出口接通并且多个输入口与多个输出口中的第二输出口断开，并且在阀芯处于第三位置的情况下，在保持多个输入口中的第一输入口与多个输出口中的第一输出口接通的状态下，多个输入口中的第二输入口与多个输出口中的第二输出口接通。According to an embodiment of the present invention, the hydraulic control valve further comprises: a plurality of input ports communicating with the input passage and leading to the valve cavity, the plurality of input ports including a first input port and a second input port , when the spool is in the first position, the plurality of input ports are disconnected from the plurality of output ports, and when the spool is in the second position, the first input port of the plurality of input ports and the plurality of output ports are disconnected The first output port is connected and the plurality of input ports are disconnected from the second output port of the plurality of output ports, and when the valve core is in the third position, the first input port of the plurality of input ports is kept connected to the plurality of output ports. When the first output port of the output ports is connected, the second input port of the plurality of input ports is connected to the second output port of the plurality of output ports.

根据本实用新型的实施例，所述阀芯包括：形成在阀芯的外周上的第一凹部和第二凹部，所述第一凹部和第二凹部与所述阀体的阀腔的内壁分别形成第一工作腔和第二工作腔，所述多个输入口中的第一输入口与第一工作腔连通，并且所述多个输入口中的第二输入口与第二工作腔连通，在阀芯处于第二位置的情况下，所述多个输入口中的第一输入口通过第一工作腔与多个输出口中的第一输出口接通，并且在阀芯处于第三位置的情况下，在保持所述多个输入口中的第一输入口通过第一工作腔与多个输出口中的第一输出口接通的状态下，所述多个输入口中的第二输入口通过第二工作腔与多个输出口中的所述第二输出口接通。According to an embodiment of the present invention, the valve core includes: a first concave portion and a second concave portion formed on the outer circumference of the valve core, the first concave portion and the second concave portion and the inner wall of the valve cavity of the valve body are respectively A first working chamber and a second working chamber are formed, the first input port of the plurality of input ports is communicated with the first working chamber, and the second input port of the plurality of input ports is communicated with the second working chamber, and the valve When the spool is in the second position, the first input port of the plurality of input ports is connected to the first output port of the plurality of output ports through the first working chamber, and when the spool is in the third position, In a state where the first input port of the plurality of input ports is kept connected to the first output port of the plurality of output ports through the first working chamber, the second input port of the plurality of input ports passes through the second working chamber Connected to the second outlet of the plurality of outlets.

本实用新型的实施例还提供了一种变排量液压泵，包括：上述的液压控制阀；变排量液压泵主体，所述变排量液压泵主体的输出口连接到所述液压控制阀的输入通道；以及泵伺服系统，所述泵伺服系统与所述液压控制阀的多个输出口中的至少一个连接，以控制所述变排量液压泵主体的排量。An embodiment of the present invention also provides a variable displacement hydraulic pump, comprising: the above-mentioned hydraulic control valve; a variable displacement hydraulic pump main body, the output port of the variable displacement hydraulic pump main body is connected to the hydraulic control valve and a pump servo system, the pump servo system is connected with at least one of the plurality of output ports of the hydraulic control valve to control the displacement of the variable displacement hydraulic pump body.

根据本实用新型的实施例，所述的变排量液压泵还包括：恒功率阀，所述恒功率阀与所述泵伺服系统连接，用于控制所述变排量液压泵主体的功率，所述恒功率阀包括：用于输入流体的第一输入口和第二输入口，其中第一输入口与所述变排量泵主体的输出口连通，所述第二输入口与所述压力控制阀的多个输出口中的所述第一输出口连通；以及与所述泵伺服系统连接的用于输出流体的输出口，其中，所述液压控制阀的多个输出口中的所述第二输出口与所述泵伺服系统直接连接。According to an embodiment of the present invention, the variable displacement hydraulic pump further comprises: a constant power valve, the constant power valve is connected to the pump servo system for controlling the power of the main body of the variable displacement hydraulic pump, The constant power valve includes: a first input port and a second input port for inputting fluid, wherein the first input port communicates with the output port of the variable displacement pump body, and the second input port is connected to the pressure the first output port of the plurality of output ports of the control valve is in communication; and the output port for outputting fluid connected with the pump servo system, wherein the second output port of the plurality of output ports of the hydraulic control valve The output port is directly connected to the pump servo system.

采用根据本实用新型的实施例的液压控制阀和具有该液压控制阀的变排量液压泵，例如可以改善液压控制阀以及变排量液压泵的性能。Using the hydraulic control valve and the variable displacement hydraulic pump having the hydraulic control valve according to the embodiment of the present invention, for example, the performance of the hydraulic control valve and the variable displacement hydraulic pump can be improved.

附图说明Description of drawings

图1是根据本实用新型的一个实施例的液压控制阀的示意剖视图：1 is a schematic cross-sectional view of a hydraulic control valve according to an embodiment of the present invention:

图2是根据本实用新型的另一个实施例的液压控制阀的示意剖视图：2 is a schematic cross-sectional view of a hydraulic control valve according to another embodiment of the present invention:

图3是根据本实用新型的又一个实施例的液压控制阀的示意剖视图：3 is a schematic cross-sectional view of a hydraulic control valve according to yet another embodiment of the present invention:

图4是根据本实用新型的一个实施例的集成的图1所示的液压控制阀和恒功率阀的示意剖视图：4 is a schematic cross-sectional view of the integrated hydraulic control valve and constant power valve shown in FIG. 1 according to an embodiment of the present invention:

图5是根据本实用新型的另一个实施例的集成的图2所示的液压控制阀和恒功率阀的示意剖视图：5 is a schematic cross-sectional view of the integrated hydraulic control valve and constant power valve shown in FIG. 2 according to another embodiment of the present invention:

图6是根据本实用新型的又一个实施例的集成的图3所示的液压控制阀和恒功率阀的示意剖视图：6 is a schematic cross-sectional view of the integrated hydraulic control valve and constant power valve shown in FIG. 3 according to yet another embodiment of the present invention:

图7是根据本实用新型的一个实施例的变排量液压泵的示意简图；7 is a schematic diagram of a variable displacement hydraulic pump according to an embodiment of the present invention;

图8是根据本实用新型的另一个实施例的变排量液压泵的示意简图；以及8 is a schematic diagram of a variable displacement hydraulic pump according to another embodiment of the present invention; and

图9是根据本实用新型的实施例的图1所示的液压控制阀在阀芯处于第一位置的情况下的示意剖视图；FIG. 9 is a schematic cross-sectional view of the hydraulic control valve shown in FIG. 1 according to an embodiment of the present invention when the spool is in a first position;

图10是根据本实用新型的实施例的图1所示的液压控制阀在阀芯处于第二位置的情况下的示意剖视图；以及10 is a schematic cross-sectional view of the hydraulic control valve shown in FIG. 1 with the spool in a second position according to an embodiment of the present invention; and

图11是根据本实用新型的实施例的图1所示的液压控制阀在阀芯处于第三位置的情况下的示意剖视图。FIG. 11 is a schematic cross-sectional view of the hydraulic control valve shown in FIG. 1 when the spool is in a third position according to an embodiment of the present invention.

具体实施方式Detailed ways

参见图1至图6、图9至11，根据本实用新型的实施例的液压控制阀100包括阀体10以及阀芯20。所述阀体10包括：在阀体10中沿轴向方向延伸的阀腔11；在阀腔11的轴向方向上的一侧形成在阀体10中并与阀腔11连通的第一腔101；用于输入流体的输入通道3；以及用于输出控制流体的多个输出口41、42，多个输出口41、42包括第一输出口41和第二输出口42。所述阀芯20设置在阀体10的阀腔11中。如图1、3、4、6、9-11所示，所述输入通道3与第一腔101连通，或者如图2、5所示，单独的用于输入致动流体的致动流体通道6与第一腔101连通。参见图9至图11，所述阀芯20能够相对于阀体10处于第一位置(参见图9)，利用所述第一腔101的第一压力从第一位置在远离第一腔101的方向上移动到第二位置(参见图10)，并且利用所述第一腔101的大于第一压力的第二压力从第二位置在远离第一腔101的方向上移动到第三位置(参见图11)。在阀芯20处于第一位置的情况下(参见图9)，所述输入通道3与多个输出口41、42断开。在阀芯20处于第二位置的情况下(参见图10)，所述输入通道3与多个输出口41、42中的第一输出口41接通并与多个输出口41、42中的第二输出口42断开，并且在阀芯20处于第三位置的情况下(参见图11)，在保持所述输入通道3与多个输出口41、42中的所述第一输出口41接通的状态下，所述输入通道3与多个输出口41、42中的所述第二输出口42接通。所述阀体10还包括用于将流体返回油箱的返回口5，在阀芯20处于第一位置的情况下(参见图9)，所述多个输出口41、42中的第一输出口41与返回口5接通，并且在阀芯20处于第二位置和第三位置的情况下(参见图10、11)，所述多个输出口41、42中的第一输出口41与返回口5断开，即所述多个输出口41、42与返回口5断开。所述阀体10还包括：与多个输出口41、42连通的、用于输出控制流体的一个输出通道(参见图7)；或者与多个输出口41、42分别连通的、用于输出控制流体的多个输出通道(参见图8)。Referring to FIGS. 1 to 6 and FIGS. 9 to 11 , the hydraulic control valve 100 according to the embodiment of the present invention includes a valve body 10 and a valve core 20 . The valve body 10 includes: a valve cavity 11 extending in the axial direction in the valve body 10 ; a first cavity formed in the valve body 10 and communicating with the valve cavity 11 on one side of the valve cavity 11 in the axial direction 101 ; an input channel 3 for inputting fluid; and a plurality of output ports 41 , 42 for outputting control fluid, the plurality of output ports 41 , 42 including a first output port 41 and a second output port 42 . The valve core 20 is arranged in the valve cavity 11 of the valve body 10 . As shown in Figures 1, 3, 4, 6, 9-11, the input channel 3 communicates with the first cavity 101, or as shown in Figures 2 and 5, a separate actuating fluid channel for inputting actuating fluid 6 communicates with the first cavity 101 . Referring to FIG. 9 to FIG. 11 , the valve core 20 can be in a first position relative to the valve body 10 (see FIG. 9 ), using the first pressure of the first cavity 101 from the first position at a distance away from the first cavity 101 direction to the second position (see FIG. 10 ), and use the second pressure of the first chamber 101 greater than the first pressure to move from the second position to the third position in a direction away from the first chamber 101 (see Figure 11). When the spool 20 is in the first position (see FIG. 9 ), the input passage 3 is disconnected from the plurality of output ports 41 , 42 . When the valve core 20 is in the second position (see FIG. 10 ), the input channel 3 is connected to the first output port 41 of the plurality of output ports 41 and 42 and is connected to the first output port 41 of the plurality of output ports 41 and 42 . The second output port 42 is disconnected, and when the spool 20 is in the third position (see FIG. 11 ), the input channel 3 and the first output port 41 among the plurality of output ports 41 and 42 are maintained. In the connected state, the input channel 3 is connected to the second output port 42 of the plurality of output ports 41 and 42 . The valve body 10 further includes a return port 5 for returning the fluid to the oil tank, and when the valve core 20 is in the first position (see FIG. 9 ), the first output port among the plurality of output ports 41 , 42 41 is connected to the return port 5, and when the spool 20 is in the second position and the third position (see FIGS. 10 and 11 ), the first output port 41 of the plurality of output ports 41 and 42 is connected to the return port 41 . The port 5 is disconnected, that is, the plurality of output ports 41 , 42 are disconnected from the return port 5 . The valve body 10 further includes: an output channel (see FIG. 7 ) communicating with the plurality of output ports 41 and 42 for outputting control fluid; or communicating with the plurality of output ports 41 and 42 respectively for outputting the control fluid. Multiple output channels for control fluids (see Figure 8).

根根据本实用新型的实施例，参见图1至图6、图9至图11，自输入通道3开始与第一输出口41连通时起，至输入通道3开始与第二输出口42连通，阀芯20的行程在0.01毫米到0.5毫米之间。According to the embodiment of the present invention, referring to FIGS. 1 to 6 and FIGS. 9 to 11 , from when the input channel 3 starts to communicate with the first output port 41, until the input channel 3 starts to communicate with the second output port 42, The travel of the spool 20 is between 0.01 mm and 0.5 mm.

根根据本实用新型的实施例，参见图1至图6、图9至图11，液压控制阀100还包括：与所述输入通道3连通的通向阀腔11的输入口30。在阀芯20处于第一位置的情况下，输入口30与多个输出口41、42断开，在阀芯20处于第二位置的情况下，输入口30与多个输出口41、42中的第一输出口41接通并与多个输出口41、42中的第二输出口42断开，并且在阀芯20处于第三位置的情况下，在保持输入口30与多个输出口41、42中的所述第一输出口41接通的状态下，输入口30与多个输出口41、42中的所述第二输出口42接通。参见图1，所述阀芯20包括：朝向第一腔101的第一端部21；与第一端部21相对的第二端部22；从阀芯20的第一端部21轴向延伸到第一端部21和第二端部22之间的轴向孔23；形成在阀芯20的外周上的第一凹部24和第二凹部25；以及分别使轴向孔23与第一凹部24和第二凹部25连通的第一连通孔26和第二连通孔27。所述第一凹部24和第二凹部25与所述阀体10的阀腔11的内壁分别形成第一工作腔51和第二工作腔52，所述输入口30与第一工作腔51连通。在阀芯20处于第二位置的情况下，输入口30通过第一工作腔51与多个输出口41、42中的第一输出口41接通，并且在阀芯20处于第三位置的情况下，在保持输入口30通过第一工作腔51与多个输出口41、42中的第一输出口41接通的状态下，输入口30通过第一工作腔51、第一连通孔26、轴向孔23、第二连通孔27和第二工作腔52与多个输出口41、42中的所述第二输出口42接通。参见图1至图3、图9至图11，所述阀芯20还包括形成在阀芯20的外周上的第三凹部28，所述第三凹部28与所述阀体10的阀腔11的内壁形成第三工作腔53，第三工作腔53与返回口5连通，参见图9，在阀芯20处于第一位置的情况下，第一输出口41与第三工作腔53连通，从而第一输出口41与返回口5接通。According to the embodiment of the present invention, referring to FIGS. 1 to 6 , 9 to 11 , the hydraulic control valve 100 further includes: an input port 30 that communicates with the input passage 3 and leads to the valve cavity 11 . When the valve body 20 is in the first position, the input port 30 is disconnected from the plurality of output ports 41 and 42, and when the valve body 20 is at the second position, the input port 30 and the plurality of output ports 41 and 42 are disconnected. The first output port 41 is connected and disconnected from the second output port 42 of the plurality of output ports 41 and 42, and when the valve core 20 is in the third position, the input port 30 and the plurality of output ports are maintained. When the first output port 41 of the plurality of output ports 41 and 42 is connected, the input port 30 is connected to the second output port 42 of the plurality of output ports 41 and 42 . Referring to FIG. 1 , the valve core 20 includes: a first end 21 facing the first cavity 101 ; a second end 22 opposite to the first end 21 ; extending axially from the first end 21 of the valve core 20 to the axial hole 23 between the first end portion 21 and the second end portion 22; the first concave portion 24 and the second concave portion 25 formed on the outer circumference of the valve core 20; and the axial hole 23 and the first concave portion, respectively A first communication hole 26 and a second communication hole 27 that communicate with the second recess 25 . The first concave portion 24 and the second concave portion 25 and the inner wall of the valve cavity 11 of the valve body 10 respectively form a first working cavity 51 and a second working cavity 52 , and the input port 30 communicates with the first working cavity 51 . When the valve core 20 is in the second position, the input port 30 is connected to the first output port 41 of the plurality of output ports 41 and 42 through the first working chamber 51, and when the valve core 20 is at the third position Under the condition that the input port 30 is connected to the first output port 41 of the plurality of output ports 41 and 42 through the first working chamber 51, the input port 30 passes through the first working chamber 51, the first communication hole 26, The axial hole 23 , the second communication hole 27 and the second working chamber 52 communicate with the second output port 42 of the plurality of output ports 41 and 42 . Referring to FIGS. 1 to 3 and FIGS. 9 to 11 , the valve core 20 further includes a third recess 28 formed on the outer circumference of the valve core 20 , and the third recess 28 is connected to the valve cavity 11 of the valve body 10 . The inner wall of the spool forms a third working chamber 53, and the third working chamber 53 communicates with the return port 5. Referring to FIG. 9, when the valve core 20 is in the first position, the first output port 41 communicates with the third working chamber 53, thereby The first output port 41 is connected to the return port 5 .

根根据本实用新型的一些实施例，参见图1、4、9-11，所述输入口30与所述第一腔101连通。例如，所述输入口30通过第一工作腔51、第一连通孔26和轴向孔23与所述第一腔101连通。According to some embodiments of the present invention, referring to FIGS. 1 , 4 , 9-11 , the input port 30 communicates with the first cavity 101 . For example, the input port 30 communicates with the first cavity 101 through the first working cavity 51 , the first communication hole 26 and the axial hole 23 .

根根据本实用新型的另外一些实施例，参见图3，连通通道35将输入通道3与所述第一腔101连通。According to other embodiments of the present invention, referring to FIG. 3 , the communication channel 35 communicates the input channel 3 with the first cavity 101 .

根根据本实用新型的实施例，参见图1至图6、图9至图11，所述阀体10还包括在阀腔11的轴向方向上的另一侧形成在阀体10中并与阀腔11连通的第二腔102，并且所述液压控制阀100还包括：弹簧7，所述弹簧7设置在阀体10的第二腔102中，用于朝向阀体10的第一腔101推动所述阀芯20，并且所述阀芯20能够相对于阀体10在所述弹簧7的推动下朝向所述第一腔101移动到第一位置。According to the embodiment of the present invention, referring to FIGS. 1 to 6 and FIGS. 9 to 11 , the valve body 10 further includes that the other side in the axial direction of the valve cavity 11 is formed in the valve body 10 and is connected with the valve body 10 . The second chamber 102 communicated with the valve chamber 11 , and the hydraulic control valve 100 further includes: a spring 7 , the spring 7 is arranged in the second chamber 102 of the valve body 10 for facing the first chamber 101 of the valve body 10 The valve core 20 is pushed, and the valve core 20 can move to the first position relative to the valve body 10 toward the first cavity 101 under the push of the spring 7 .

根根据本实用新型的另外一些实施例，参见图2、3、5、6，液压控制阀100还包括：与所述输入通道3连通的用于输入流体的多个输入口31、32，多个输入口31、32包括第一输入口31和第二输入口32。在阀芯20处于第一位置的情况下，多个输入口31、32与多个输出口41、42断开，在阀芯20处于第二位置的情况下，多个输入口31、32中的第一输入口31与多个输出口41、42中的第一输出口41接通并且多个输入口31、32与多个输出口41、42中的第二输出口42断开，并且在阀芯20处于第三位置的情况下，在保持多个输入口31、32中的第一输入口31与多个输出口41、42中的第一输出口41接通的状态下，多个输入口31、32中的第二输入口32与多个输出口41、42中的第二输出口42接通。根据本实用新型的示例，所述阀芯20包括：形成在阀芯20的外周上的第一凹部24和第二凹部25，所述第一凹部24和第二凹部25与所述阀体10的阀腔11的内壁分别形成第一工作腔51和第二工作腔52，所述多个输入口31、32中的第一输入口31与第一工作腔51连通，并且所述多个输入口31、32中的第二输入口32与第二工作腔52连通。在阀芯20处于第二位置的情况下，所述多个输入口31、32中的第一输入口31通过第一工作腔51与多个输出口41、42中的第一输出口41接通，并且在阀芯20处于第三位置的情况下，在保持所述多个输入口31、32中的第一输入口31通过第一工作腔51与多个输出口41、42中的第一输出口41接通的状态下，所述多个输入口31、32中的第二输入口32通过第二工作腔52与多个输出口41、42中的所述第二输出口42接通。According to other embodiments of the present invention, referring to FIGS. 2 , 3 , 5 , and 6 , the hydraulic control valve 100 further includes: a plurality of input ports 31 and 32 for inputting fluid, which are communicated with the input channel 3 , Each of the input ports 31 and 32 includes a first input port 31 and a second input port 32 . When the valve body 20 is at the first position, the plurality of input ports 31 and 32 are disconnected from the plurality of output ports 41 and 42, and when the valve body 20 is at the second position, among the plurality of input ports 31 and 32 The first input port 31 is connected to the first output port 41 of the plurality of output ports 41, 42 and the plurality of input ports 31, 32 is disconnected from the second output port 42 of the plurality of output ports 41, 42, and When the valve body 20 is in the third position, in a state in which the first input port 31 of the plurality of input ports 31 and 32 is kept connected to the first output port 41 of the plurality of output ports 41 and 42, more The second input port 32 of the plurality of input ports 31 and 32 is connected to the second output port 42 of the plurality of output ports 41 and 42 . According to an example of the present invention, the valve core 20 includes: a first recess 24 and a second recess 25 formed on the outer circumference of the valve core 20 , the first recess 24 and the second recess 25 and the valve body 10 The inner wall of the valve chamber 11 respectively forms a first working chamber 51 and a second working chamber 52, the first input port 31 of the plurality of input ports 31 and 32 communicates with the first working chamber 51, and the plurality of input ports 31 and 32 communicate with the first working chamber 51. The second input port 32 of the ports 31 , 32 communicates with the second working chamber 52 . When the valve core 20 is in the second position, the first input port 31 of the plurality of input ports 31 and 32 is connected to the first output port 41 of the plurality of output ports 41 and 42 through the first working chamber 51 . When the valve core 20 is in the third position, the first input port 31 of the plurality of input ports 31 and 32 is maintained to pass through the first working chamber 51 and the first input port 41 and 42 of the plurality of output ports 41 and 42. When an output port 41 is turned on, the second input port 32 of the plurality of input ports 31 and 32 is connected to the second output port 42 of the plurality of output ports 41 and 42 through the second working chamber 52 Pass.

如图7所示，根据本实用新型的实施例的变排量液压泵200包括：上述的液压控制阀100、变排量液压泵主体201和泵伺服系统8。所述变排量液压泵主体201的输出口连接到所述液压控制阀100的输入通道3。所述泵伺服系统8与所述液压控制阀100的多个输出口41、42中的至少一个连接，以控制所述变排量液压泵主体201的排量。As shown in FIG. 7 , the variable displacement hydraulic pump 200 according to the embodiment of the present invention includes the above-mentioned hydraulic control valve 100 , the variable displacement hydraulic pump body 201 and the pump servo system 8 . The output port of the variable displacement hydraulic pump body 201 is connected to the input passage 3 of the hydraulic control valve 100 . The pump servo system 8 is connected to at least one of the plurality of output ports 41 and 42 of the hydraulic control valve 100 to control the displacement of the variable displacement hydraulic pump body 201 .

参见图4、7，变排量泵主体201(例如变排量柱塞泵)的输出口的压力流体通过阀体10中的流道通向输入通道3，由输入通道3经过输入口30、第一工作腔51、第一连通孔26和轴向孔23进入第一腔101。第一腔101中的流体作用于阀芯20的左端，阀芯20的右端受弹簧7的作用，当第一腔101中的流体的压力能够推动阀芯20使阀芯20处于第二位置时，输入口30与多个输出口41、42中的第一输出口41接通，则液压控制阀100起作用，压力流体去往变排量泵主体201的控制缸，变排量泵主体201的排量减小。有一些工况下，例如在外部负载突然升高时，需要将变排量泵主体201的排量快速降低从而降低负载冲击。如果变排量泵主体201的排量不能快速降低，而使变排量泵主体201的输出口的压力继续上升的情况下，例如，需要通过快速降低机械设备的变排量泵主体201的排量来快速降低机械设备的与液压油缸连接的工具的行进速度的情况下，第一腔101中的流体的压力推动阀芯20继续右移，阀芯20处于第三位置，在保持输入口30与多个输出口41、42中的所述第一输出口41接通的状态下，输入口30与多个输出口41、42中的所述第二输出口42接通。第二输出口42将高压流体输送到变排量泵主体201的控制缸。使变排量泵主体201的控制缸得到更充足的流量，更快地使变排量泵主体201达到小排量，使压力增高量减小。4 and 7, the pressure fluid at the output port of the variable displacement pump body 201 (eg, variable displacement plunger pump) leads to the input channel 3 through the flow channel in the valve body 10, and the input channel 3 passes through the input port 30, The first working chamber 51 , the first communication hole 26 and the axial hole 23 enter the first chamber 101 . The fluid in the first chamber 101 acts on the left end of the valve core 20, and the right end of the valve core 20 is acted by the spring 7, when the pressure of the fluid in the first chamber 101 can push the valve core 20 to make the valve core 20 in the second position , the input port 30 is connected to the first output port 41 of the plurality of output ports 41 and 42, the hydraulic control valve 100 works, and the pressure fluid goes to the control cylinder of the variable displacement pump main body 201, and the variable displacement pump main body 201 The displacement is reduced. In some working conditions, for example, when the external load suddenly increases, the displacement of the variable displacement pump body 201 needs to be rapidly reduced to reduce the load shock. If the displacement of the variable displacement pump main body 201 cannot be rapidly reduced and the pressure at the output port of the variable displacement pump main body 201 continues to rise, for example, it is necessary to rapidly reduce the displacement of the variable displacement pump main body 201 of the mechanical equipment. In the case of rapidly reducing the travel speed of the tool connected to the hydraulic cylinder of the mechanical equipment, the pressure of the fluid in the first chamber 101 pushes the spool 20 to continue to move to the right, and the spool 20 is in the third position, while maintaining the input port 30 In a state of being connected to the first output port 41 of the plurality of output ports 41 and 42 , the input port 30 is connected to the second output port 42 of the plurality of output ports 41 and 42 . The second output port 42 delivers high pressure fluid to the control cylinder of the variable displacement pump body 201 . The control cylinder of the variable displacement pump main body 201 can obtain a more sufficient flow rate, the variable displacement pump main body 201 can reach a small displacement faster, and the pressure increase amount can be reduced.

根据本实施方式，在稳态工作时(流量稳定且较小时)，第一输出口41能够满足需求。但是当系统在动态工作时，有时候所需流量变换很大，这样阀芯就需要提供很大流量，此时阀芯行程会有较大的超调量，这个超调量是液压系统中要避免的。通过设置第二输出口42，当阀芯超调时，能够通过第一输出口41和第二输出口42同时输出流量，此后阀芯不会继续向远离第一位置的方向猛冲，由此，能够将阀芯行程的超调量控制在很小的范围。而当阀芯回到稳态工作时，又回到仅由第一输出口41输出的状态。According to the present embodiment, in steady state operation (when the flow rate is stable and small), the first output port 41 can meet the requirements. However, when the system is working dynamically, sometimes the required flow changes greatly, so the spool needs to provide a large flow. At this time, the spool stroke will have a large overshoot. This overshoot is the most important part of the hydraulic system. Avoided. By setting the second output port 42, when the valve core is overshooting, the flow can be output through the first output port 41 and the second output port 42 at the same time, and then the valve core will not continue to slam in the direction away from the first position, thus , the overshoot of the spool stroke can be controlled in a small range. When the valve core returns to the steady state operation, it returns to the state of being output only by the first output port 41 .

参见图8，其与图7类似，但该变排量液压泵200还包括恒功率阀9。所述恒功率阀9与所述泵伺服系统8连接，用于控制所述变排量液压泵主体201的功率，例如，使所述变排量液压泵主体201的功率基本上恒定。所述恒功率阀9包括：用于输入流体的第一输入口91和第二输入口92、和与所述泵伺服系统8连接的用于输出流体的输出口93，第一输入口91与所述变排量泵主体201的输出口连通，所述第二输入口92与所述液压控制阀100的多个输出口41、42中的所述第一输出口41连通。所述液压控制阀100的多个输出口41、42中的所述第二输出口42与所述泵伺服系统8直接连接而未经过恒功率阀9。Referring to FIG. 8 , which is similar to FIG. 7 , but the variable displacement hydraulic pump 200 also includes a constant power valve 9 . The constant power valve 9 is connected to the pump servo system 8 for controlling the power of the variable displacement hydraulic pump body 201 , for example, to make the power of the variable displacement hydraulic pump body 201 substantially constant. The constant power valve 9 includes: a first input port 91 and a second input port 92 for inputting fluid, and an output port 93 for outputting fluid connected to the pump servo system 8. The first input port 91 is connected to the pump servo system 8. The output port of the variable displacement pump body 201 is communicated with, and the second input port 92 is communicated with the first output port 41 of the plurality of output ports 41 and 42 of the hydraulic control valve 100 . The second output port 42 of the plurality of output ports 41 , 42 of the hydraulic control valve 100 is directly connected to the pump servo system 8 without passing through the constant power valve 9 .

当变排量液压泵200包括液压控制阀100和恒功率阀9时，液压控制阀100的工作原理与图7中所示的液压控制阀100的工作原理相同。当液压控制阀100的第一腔101中的流体的压力能够推动阀芯20使阀芯20处于第二位置时，输入口30与多个输出口41、42中的第一输出口41接通，压力流体需要通过恒功率阀9输入到变排量泵主体201的控制缸。如果恒功率阀9的阀芯处在图8中的左位，会阻碍压力流体输入到变排量泵主体201的控制缸，变排量泵主体201无法快速降低排量。变排量泵主体201的排量不能快速降低而使变排量泵主体201的输出口的压力继续上升的情况下，液压控制阀100的第一腔101中的流体的压力推动阀芯20继续右移，阀芯20处于第三位置，在保持输入口30与多个输出口41、42中的所述第一输出口41接通的状态下，输入口30与多个输出口41、42中的所述第二输出口42接通。第二输出口42将高压流体直接(不经过恒功率阀9)输送到变排量泵主体201的控制缸。由此更快地使变排量泵主体201达到小排量，使压力增高量减小。另外，也能实现结合上一实施方式所描述的减小超调的作用。When the variable displacement hydraulic pump 200 includes the hydraulic control valve 100 and the constant power valve 9 , the working principle of the hydraulic control valve 100 is the same as that of the hydraulic control valve 100 shown in FIG. 7 . When the pressure of the fluid in the first chamber 101 of the hydraulic control valve 100 can push the spool 20 so that the spool 20 is in the second position, the input port 30 is connected to the first output port 41 of the plurality of output ports 41 and 42 , the pressure fluid needs to be input to the control cylinder of the variable displacement pump body 201 through the constant power valve 9 . If the valve core of the constant power valve 9 is in the left position in FIG. 8 , it will prevent the pressure fluid from being input to the control cylinder of the variable displacement pump main body 201 , and the variable displacement pump main body 201 cannot quickly reduce the displacement. When the displacement of the variable displacement pump main body 201 cannot be rapidly reduced and the pressure at the output port of the variable displacement pump main body 201 continues to rise, the pressure of the fluid in the first chamber 101 of the hydraulic control valve 100 pushes the spool 20 to continue Move to the right, the spool 20 is in the third position, and the input port 30 and the plurality of output ports 41 and 42 are in a state where the input port 30 and the first output port 41 of the plurality of output ports 41 and 42 are kept connected. The second output port 42 in is turned on. The second output port 42 delivers the high pressure fluid directly (without passing through the constant power valve 9 ) to the control cylinder of the variable displacement pump body 201 . Thereby, the variable displacement pump main body 201 can be made to reach a small displacement more quickly, and the pressure increase amount can be reduced. In addition, the effect of reducing the overshoot described in conjunction with the previous embodiment can also be achieved.

根据本实用新型的实施例的液压控制阀100和变排量液压变排量泵主体201能够实现低超调功能。第一输出口为正常输出口，第二输出口为超调输出口。超调输出口的启动位置可以根据实际流量需求进行调整。The hydraulic control valve 100 and the variable displacement hydraulic variable displacement pump body 201 according to the embodiment of the present invention can realize a low overshoot function. The first output port is the normal output port, and the second output port is the overshoot output port. The starting position of the overshoot output port can be adjusted according to the actual flow demand.

根据本实用新型的实施例的液压控制阀100和变排量液压变排量泵主体201，由于设置了多个输出口，提高了流量增益，减小了阀芯的超调。此外，正常工作时，第一输出口41工作，泄漏不增加。在与其它阀集成时，第二输出口42可直连变排量泵伺服系统的控制缸，不和其他阀产生干扰。这样减小其他阀的干扰。The hydraulic control valve 100 and the variable displacement hydraulic variable displacement pump main body 201 according to the embodiment of the present invention are provided with multiple output ports, thereby increasing the flow gain and reducing the overshoot of the valve core. In addition, during normal operation, the first output port 41 works and the leakage does not increase. When integrated with other valves, the second output port 42 can be directly connected to the control cylinder of the variable displacement pump servo system without interfering with other valves. This reduces interference from other valves.

尽管上述实施例中描述了液压控制阀100的输出口41、42，但是液压控制阀100可以包括更多个输出口，例如包括三个、四个或更多个输出口。Although the output ports 41, 42 of the hydraulic control valve 100 are described in the above embodiment, the hydraulic control valve 100 may include more output ports, eg, three, four or more output ports.

Claims (11)

1. A hydraulic control valve characterized by comprising:
a valve body, the valve body comprising: a valve cavity extending in an axial direction in the valve body; a first chamber formed in the valve body on one side in an axial direction of the valve chamber and communicating with the valve chamber; an input channel for inputting a fluid; and a plurality of outlets for outputting a control fluid, the plurality of outlets including a first outlet and a second outlet; and
a valve spool disposed in a valve cavity of the valve body, wherein:
the valve spool is movable relative to the valve body in a first position from the first position in a direction away from the first chamber to a second position with a first pressure of the first chamber and from the second position in a direction away from the first chamber to a third position with a second pressure of the first chamber greater than the first pressure,
with the spool in the first position, the input passage is disconnected from the plurality of output ports,
with the spool in the second position, the input passage is open to a first of the plurality of output ports and is open to a second of the plurality of output ports, and
when the spool is in the third position, the input channel is in communication with the second of the plurality of output ports while maintaining the input channel in communication with the first of the plurality of output ports.
2. The hydraulic control valve of claim 1, wherein:
the stroke of the valve core is between 0.01 mm and 0.5 mm from the time when the input channel is communicated with the first output port to the time when the input channel is communicated with the second output port.
3. The hydraulic control valve of claim 1, wherein:
the valve body further includes a return port for returning fluid to the tank, a first of the plurality of output ports being in communication with the return port when the spool is in the first position, and being out of communication with the return port when the spool is in the second and third positions.
4. The hydraulic control valve of claim 1, further comprising:
an input port for inputting a fluid in communication with the input channel, wherein:
with the spool in the first position, the input port is disconnected from the plurality of output ports,
with the spool in the second position, the input port is open to a first of the plurality of output ports and is closed to a second of the plurality of output ports, and
when the spool is in the third position, the input port is communicated with the second one of the plurality of output ports while maintaining the input port in communication with the first one of the plurality of output ports.
5. The hydraulic control valve of claim 4, wherein:
the valve core includes:
a first end facing the first cavity;
a second end opposite the first end;
an axial bore extending axially from the first end of the spool to between the first end and the second end;
a first recess and a second recess formed on an outer periphery of the valve body; and
a first communicating hole and a second communicating hole which respectively communicate the axial hole with the first recess portion and the second recess portion, the first recess portion and the second recess portion and an inner wall of the valve chamber of the valve body respectively forming a first working chamber and a second working chamber, the input port communicating with the first working chamber,
with the spool in the second position, the input port is in communication with a first output port of the plurality of output ports through the first working chamber, and
when the spool is in the third position, the input port is communicated with a first output port of the plurality of output ports through the first working chamber, the first communication hole, the axial hole, the second communication hole, and the second working chamber while maintaining the state in which the input port is communicated with the first output port of the plurality of output ports through the first working chamber.
6. The hydraulic control valve of claim 5, wherein:
the input port is communicated with the first cavity through the first working cavity, the first communication hole and the axial hole.
7. The hydraulic control valve according to claim 1 or 3, characterized in that:
the valve body further includes a second chamber formed in the valve body on the other side in the axial direction of the valve chamber and communicating with the valve chamber, and
the hydraulic control valve further includes: a spring disposed in the second chamber of the valve body for urging the valve spool toward the first chamber of the valve body, and the valve spool is movable relative to the valve body to a first position toward the first chamber under urging of the spring.
8. The hydraulic control valve of claim 1, further comprising:
a plurality of input ports communicating with the input passage and opening into the valve chamber, the plurality of input ports including a first input port and a second input port,
with the spool in the first position, the plurality of input ports are disconnected from the plurality of output ports,
with the spool in the second position, a first of the plurality of input ports is in communication with a first of the plurality of output ports and the plurality of input ports is disconnected from a second of the plurality of output ports, and
with the spool in the third position, a second one of the plurality of input ports is communicated with a second one of the plurality of output ports while maintaining the first one of the plurality of input ports in communication with the first one of the plurality of output ports.
9. The hydraulic control valve of claim 8, wherein:
the valve core includes:
a first recessed portion and a second recessed portion formed on an outer periphery of the spool, the first and second recessed portions and an inner wall of the valve chamber of the valve body forming a first working chamber and a second working chamber, respectively, a first input port of the plurality of input ports communicating with the first working chamber, and a second input port of the plurality of input ports communicating with the second working chamber,
with the spool in the second position, a first of the plurality of input ports is in communication with a first of the plurality of output ports through a first working chamber, and
with the spool in the third position, a second one of the plurality of input ports is communicated with a first one of the plurality of output ports through a second working chamber while maintaining the first one of the plurality of input ports in communication with the first one of the plurality of output ports through the first working chamber.
10. A variable displacement hydraulic pump, comprising:
the hydraulic control valve of claims 1 to 9;
a variable displacement hydraulic pump main body, an output port of which is connected to an input passage of the hydraulic control valve; and
a pump servo connected to at least one of the plurality of output ports of the hydraulic control valve to control a displacement of the variable displacement hydraulic pump main body.
11. The variable displacement hydraulic pump of claim 10, further comprising:
a constant power valve connected to the pump servo for controlling power of the variable displacement hydraulic pump body, the constant power valve comprising:
a first input port for inputting fluid, the first input port in communication with an output port of the variable displacement pump body, and a second input port in communication with the first of the plurality of output ports of the hydraulic control valve; and
an output port connected to the pump servo for outputting fluid,
wherein the second output port of the plurality of output ports of the hydraulic control valve is directly connected to the pump servo system.
CN202020560982.0U 2020-04-15 2020-04-15 Hydraulic control valve and variable displacement hydraulic pump with hydraulic control valve Withdrawn - After Issue CN212028216U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113530904A (en) * 2020-04-15 2021-10-22 丹佛斯动力系统（浙江）有限公司 Hydraulic control valve and variable displacement hydraulic pump with hydraulic control valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113530904A (en) * 2020-04-15 2021-10-22 丹佛斯动力系统（浙江）有限公司 Hydraulic control valve and variable displacement hydraulic pump with hydraulic control valve
CN113530904B (en) * 2020-04-15 2025-05-27 丹佛斯动力系统（浙江）有限公司 Hydraulic control valve and variable displacement hydraulic pump having the same

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