KR20160115035A - Blocking valve for EHPC - Google Patents

Blocking valve for EHPC Download PDF

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Publication number
KR20160115035A
KR20160115035A KR1020150041683A KR20150041683A KR20160115035A KR 20160115035 A KR20160115035 A KR 20160115035A KR 1020150041683 A KR1020150041683 A KR 1020150041683A KR 20150041683 A KR20150041683 A KR 20150041683A KR 20160115035 A KR20160115035 A KR 20160115035A
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KR
South Korea
Prior art keywords
port
spool
sensor unit
pressure
housing
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KR1020150041683A
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Korean (ko)
Inventor
이철우
Original Assignee
(주)제이에스티앤랩
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Priority to KR1020150041683A priority Critical patent/KR20160115035A/en
Publication of KR20160115035A publication Critical patent/KR20160115035A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/202—Externally-operated valves mounted in or on the actuator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)

Abstract

The present invention relates to a blocking valve for an electro-hydraulic drive cylinder. The present invention comprises: a housing (30) forming a first port (35) and a second port (36) to which a fluid is transferred from the outside and forming a spool space (S) across each of the first port (35) and the second port (36); and opening and closing spools (49, 50) inserted into the spool space (S) and forming spool flow paths (49, 50) therein to be connected to and disconnected from the first port (35) and the second port (36) for opening and closing the first port (35) and the second port (36) via rotation. In addition, a sensor unit (65) can be coupled in the housing (30) to be connected to and disconnected from the first port (35) and the second port (36) via the opening and closing spools (49, 50) and a sensor can be coupled to measure a flow rate of at least one among the first port (35) and the second port (36). The present invention can open and close the first port (35) and the second port (36) concurrently via the rotation of the opening and closing spools (49, 50) installed therein, thereby enabling a user to open and close the flow path at once before or after replacing control valves. Therefore, leakage of the fluid or non-functioning of a safety valve due to carelessness or the like is prevented.

Description

[0001] Blocking valve for EHPC [0002]

The present invention relates to a blocking valve, and more particularly, to a blocking valve for an electrohydraulic type driving cylinder capable of simultaneously measuring a flow rate and a pressure of a hydraulic device, .

A fluid having a predetermined pressure is used for the hydraulic apparatus to produce a specific operation of the apparatus. For example, in an actuator, a piston is operated using hydraulic pressure, and a rod connected to the piston is moved to produce a desired operation.

For example, in an industrial boiler, when the internal steam pressure increases beyond the designed value, it is discharged to prevent the boiler from exploding, and a safety valve is used for this purpose. An actuator is used for the safety valve, and a fluid is flowed for operation of the piston of the actuator, and a control valve is used for fluid flow. The control valve moves the fluid to the inside and the outside of the actuator to determine the moving direction of the piston, thereby creating the operation of the safety valve.

The control valve should be replaced while the operation of the safety valve is stopped when the control valve fails. In this case, since the operation of the safety boiler is stopped, the production operation must be stopped.

In order to prevent this, a device for closing the fluid passage through the control valve and into the actuator is provided so that the control valve can be replaced without stopping the operation of the safety valve as in the prior art document.

However, in the conventional apparatus as described above, the flow path through which the fluid flows into and out of the actuator is separately opened and closed. Therefore, if the operator does not close or open all the flow paths of the conventional apparatus due to carelessness, there is a problem that the fluid leaks or the operation of the replaced control valve is not performed.

In addition, since the conventional apparatus has no structure for measuring the state of the fluid, that is, the pressure of the flowing fluid and the flow rate of the fluid passing through the flow path, there is an inconvenience that a separate device must be attached or connected to measure the flow.

Korean Patent No. 10-1085997

SUMMARY OF THE INVENTION It is an object of the present invention to provide a blocking block for a hydraulic device capable of simultaneously opening and closing a plurality of flow paths controlled by a control valve.

In addition, the present invention enables the monitoring of the state of the fluid through the blocking block for the hydraulic device.

According to an aspect of the present invention for achieving the above object, the present invention provides a spool space in which a first port and a second port through which a fluid is delivered from the outside are formed, and a spool space crossing the first port and the second port, respectively, An opening / closing spool inserted in the spool space and having a spool flow path formed therein for opening and closing the first port and the second port through rotation, the opening / closing spool being connected to the first port and the second port, And a sensor unit coupled to the first port and the second port and coupled to the sensor for measuring a flow rate of at least one of the first port and the second port, .

Wherein a first communication passage and a second communication passage are formed in the spool passage of the opening and closing spool, the first communication passage connects and disconnects between the first port and the sensor unit, and the second communication passage communicates with the second port And connecting and disconnecting the sensor unit.

The sensor unit and the housing are connected to each other by the discharge passage, and the fluid introduced into the sensor unit through the spool passage of the opening / closing spool is discharged to the outside through the discharge passage.

Wherein the sensor unit comprises a first sensor unit connected to the first port and a second sensor unit connected to the second port, wherein the first sensor unit and the second sensor unit are respectively connected to the housing, And the fluid introduced into the first sensor unit and the second sensor unit is discharged to the outside through the first discharge channel and the second discharge channel, respectively.

The housing is provided with a pressure sensing port, and a pressure sensor is selectively coupled to the pressure sensing port to measure a pressure inside the housing.

The housing is provided with a pressure unit, and the pressure unit is provided with a pressure spool having a pressure passage formed therein, so that the pressure passage is opened and closed through rotation of the pressure spool.

A spool housing is provided between the housing and the pressure unit, and the spool space is formed in the spool housing.

The opening / closing spool and the pressure spool are respectively provided with an opening / closing lever and a pressure lever and rotated together with the opening / closing spool and the pressure spool.

In the blocking valve for an electrohydraulic type driving cylinder according to the present invention as described above, the following effects can be expected.

According to the present invention, since the first port and the second port can be simultaneously opened and closed through rotation of the opening / closing spool provided on the blocking valve for the electrohydraulic drive cylinder, the user can open and close the flow path at a time before and after the replacement of the control valve, It is possible to prevent the leakage of the fluid or the non-operation of the safety valve.

In the present invention, the flow rate of the fluid flowing into the hydraulic device can be monitored by the sensor unit, and the pressure can be measured through the pressure sensing port formed in the housing. Therefore, There is an effect that can be controlled.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a mounting view showing an embodiment of a blocking valve for an electrohydraulic drive cylinder according to the present invention mounted between a control valve unit and a hydraulic cylinder; FIG.
2 is a perspective view showing the configuration of a torque motor and a control valve constituting a blocking valve for an electrohydraulic type driving cylinder according to the present invention.
3 is a perspective view showing a configuration in which a flow sensor is removed in an embodiment of a blocking valve for an electrohydraulic drive cylinder according to the present invention;
4 is a cross-sectional view taken along the line A-A 'in Fig. 3;
5 is a sectional view taken along line I-I 'of FIG. 3;
Fig. 6 is a state in which the operating lever is rotated in Fig. 3; Fig.
7 is a cross-sectional view taken along line II-II 'of FIG. 6;

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the understanding why the present invention is not intended to be interpreted.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

1, the blocking valve according to the present invention is used in combination with an electrohydraulic power cylinder (EHPC), that is, a hydraulic device. The hydraulic device includes a torque motor 10, a servo valve 13, And a hydraulic cylinder (80). At this time, a blocking valve for the electrohydraulic type driving cylinder is coupled between the servo valve 13 and the hydraulic cylinder 80. As shown in FIG. 1, a separate large flow rate valve (not shown) is provided between the blocking valve for the electrohydraulic type driving cylinder and the hydraulic cylinder 80 (70) may be provided.

The hydraulic cylinder 80 is normally operated by driving the servo valve 13. That is, the servo valve 13 is a kind of control valve. The servo valve 13 supplies working fluid to the inside of the hydraulic cylinder 80 so that the operating part of the hydraulic cylinder 80, for example, The piston rod is moved in and out.

The skeleton of the torque motor 10 is formed by the motor body 11 and serves to convert the input electricity quantity into a mechanical operation. The servo valve 13 is coupled to the torque motor 10 and functions as a valve for controlling the hydraulic pressure. The torque motor 10 and the servo valve 13 may be regarded as one configuration.

2, a valve pressure port 14, a first fluid port 15, a second fluid port 16, and a drain hole 17 are formed in the servo valve 13. The valve pressure port 14 and the first fluid port 15 and the second fluid port 16 are communicated with a blocking valve for an electrohydraulic type driving cylinder to be described later.

The blocking valve for the electrohydraulic type driving cylinder is largely constituted by the housing 30, the opening and closing spools 49, 50 and the sensor unit 65. The housing 30 forms a skeleton of a blocking valve for an electrohydraulic drive cylinder, and is a portion coupled to the servo valve 13. 3, the housing 30 is provided with a block pressure port 33 connected to the valve pressure port 14, a first port 35 connected to the first fluid port 15, A second port 36 connected to the drain hole 16, and a communication hole 37 connected to the drain hole 17, respectively. The first port 35 and the second port 36 will be described below again.

A pressure sensing port 32 is formed at one side of the housing 30. A pressure sensor (not shown) is selectively coupled to the pressure sensing port 32 so that the pressure of the hydraulic device, for example, the pneumatic pressure, can be measured. That is, when the conventional servo valve 13 and the hydraulic cylinder 80 are not deformed and a blocking valve for the electrohydraulic type driving cylinder is provided therebetween, the pressure can be measured through the valve. 4, a pressure connection portion 32 'is formed in the pressure sensing port 32 and a pressure sensing port 32 is connected to the large flow rate valve 70 through the pressure connection portion 32' Pressure measurement is possible.

The first port 35 and the second port 36 are the portions where the fluid for controlling the hydraulic cylinder 80 moves and the fluid flows through the first port 35 or the second port 36 The operating portion of the hydraulic cylinder 80 is operated. That is, in this embodiment, since the hydraulic cylinder 80 is of the double acting type, the direction of movement of the piston is determined depending on which of the inside of the hydraulic cylinder 80 partitioned by the piston is supplied with the working fluid. And the second port 36 determine this.

The first port 35 and the second port 36 are each a kind of flow path formed inside the housing 30 and both ends thereof are opened to the outside of the housing 30 and connected to the outside. Since the first port 35 and the second port 36 have the same structure, the first port 35 will be described below as an example.

4, the first port 35 extends from one side of the housing 30 and opens upwardly. The first port 35 is connected to the spool housing 40 And is connected to the first connection port 45 '. More precisely, the first port 35 is connected to the first communication passage 49 'of the opening / closing spool 49, 50, which will be described below. The first port 35 is connected to the first communication passage 49 ') To the internal space of the sensor unit 65, which will be described later. Of course, when the first port 35 is disconnected from the first communication passage 49 'by the operation of the opening / closing spools 49 and 50, the connection with the sensor unit 65 is also interrupted. 4 and 5 illustrate the connection of the first port 35 and the first communication passage 49 '. Reference numeral 35 denotes an inlet through which the first port 35 is connected to the first fluid port 15 of the servo valve 13 and reference numeral 36 denotes a port through which the second port 36 is connected to the servo valve 13 And an inlet connected to the second fluid port 16.

A first discharge port 34 'is formed to be spaced apart from the first port 35. The first discharge port 34 'is not connected to the first port 35 but is connected to the first discharge flow path 44 of the spool housing 40. The first discharge port 34 'is connected to the inside of the sensor unit 65 through the first discharge flow passage 44. The working fluid introduced into the sensor unit 65 through the first port 35 and the first communication passage 49 'flows through the first discharge passage 44 and the first discharge port 34' Can be moved outward. In this embodiment, the first discharge port 34 'is connected to the large flow valve 70 to transmit the working fluid. For reference, the second exhaust port and the second exhaust path are not shown in the figure, but are formed in the same structure as the first exhaust port 34 'and the first exhaust path 44. Reference numeral 34 denotes an outlet of the first discharge port 34 '.

5, the first port 35 and the second port 36 extend in a side-by-side direction, and the second port 36 extends in the second communication path 50 'of the opening / closing spools 49, And the second port 36 is connected to the inner space of the sensor unit 65 through the second communication path 50 'as in the first port 35. [

The housing (30) is provided with pressure units (38, 39). The pressure units 38 and 39 include a pressure lever 38 and a pressure spool 39. The pressure units 38 and 39 serve to selectively deliver the pneumatic pressure to the large flow valve 70 side do. That is, when the pressure lever 38 is rotated so that the pressure passage 39 'of the pressure spool 39 faces the large flow valve 70, the air pressure supplied from the outside is transmitted to the large flow valve 70 side . FIG. 5 shows a state in which the pressure passage 39 'is opened, and FIG. 7 shows a state in which the pressure passage 39' is blocked.

Meanwhile, a spool housing 40 is provided on the upper portion of the housing 30. The spool housing 40 is coupled to the upper portion of the housing 30, and a spool space S is formed therein. The spool space S is a space through which the opening and closing spools 49 and 50 are inserted and is formed to be long in the longitudinal direction of the spool housing 40.

A first connection port 45 'and a second connection port 46' are formed in the spool housing 40. The first connection port 45 'is connected to the first port 35 of the housing 30 and the second connection port 46' is connected to the second port 36. Reference numeral 45 denotes a portion connected to the sensor unit 65 at the outlet of the first connection port 45 'and 46 denotes a portion connected to the sensor unit 65 at the outlet of the second connection port 46' Lt; / RTI >

The spool space S is provided with opening and closing spools 49 and 50 which are installed across the first and second connecting ports 45 and 46 ' . The opening and closing spools (49, 50) can be rotated by the opening and closing lever (48). In this embodiment, the opening and closing spools 49 and 50 are constituted by the first body 49 and the second body 50, and they are connected to each other by the fastener B, but the opening and closing spools 49, 50 may be integrally formed.

Spool flow paths 49 'and 50' are formed in the opening and closing spools 49 and 50, respectively. The spool flow paths 49 'and 50' extend in a direction orthogonal to a virtual rotation axis of the opening and closing spools 49 and 50. In this embodiment, the spool flow paths 49 'and 50' And a communication passage 49 'and a second communication passage 50'. 5, the first communication passage 49 'is connected to the first connection port 45', and the second communication passage 50 'is connected to the second connection port 46'. When the opening and closing spools 49 and 50 are rotated, as shown in FIG. 7, the first communication passage 49 'and the second communication passage 50' are connected to the first connection port 45 ' 2 connection port 46 'to be disconnected. The first port 35 and the second port 36 of the housing 30 are also disconnected from the first connection port 45 'and the second connection port 46'. That is, the first port 35 and the second port 36 can be simultaneously disconnected from the sensor unit 65 through the rotation of the opening / closing spools 49 and 50.

4, the spool housing 40 is formed with a first discharge flow passage 44 and the first discharge port 34 'is connected to the first discharge flow passage 44 through the first discharge flow passage 44, And is connected to the inside. The first discharge passage 44 is an independent fluid passage spaced apart from the first communication passage 49 'and serves to guide the working fluid to the first discharge port 34'. That is, the working fluid introduced into the sensor unit 65 through the first port 35 and the first communication passage 49 'flows through the first discharge passage 44 and the first discharge port 34' Can be moved outward.

A sensor unit (65) is coupled to the spool housing (40). The sensor unit 65 is coupled to the spool housing 40 to receive a working fluid from the first port 35 and the second port 36 and to receive the working fluid from the first discharge port 34 ' The flow rate of the working fluid is measured in this process. For this purpose, a measuring device (not shown) may be connected to the first sensor part 65A and the second sensor part 65B.

The sensor unit 65 includes a first sensor unit 65A and a second sensor unit 65B. The first sensor unit 65A and the second sensor unit 65B are independent from each other. The first sensor unit 65A is connected to the first port 35 through the opening / closing spools 49 and 50, And the second sensor unit 65B is connected to the second port 36 through the opening and closing spools 49,

As described above, after the working fluid is introduced into the first sensor portion 65A from the first port 35 through the opening / closing spools 49 and 50, the working fluid again flows into the first discharge passage 44 And is moved to the side of the large flow rate valve 70 via the first discharge port 34 '.

Hereinafter, the operation of the blocking valve for the electrohydraulic type driving cylinder according to the present invention will be described through the flow of the working fluid.

First, a blocking valve for an electrohydraulic drive cylinder according to the present invention is installed between a conventional servo valve 13 and a hydraulic cylinder 80. A separate measuring device is installed in the sensor unit 65 and the housing 30 of the blocking valve for the electrohydraulic type driving cylinder to monitor the flow rate of the working fluid and the pressure of the hydraulic device.

The working fluid is supplied into the blocking valve for the electrohydraulic drive cylinder through the servo valve 13 described above. More precisely, the working fluid is supplied to the first port 35 or the second port 36 of the housing 30 via the servo valve 13. The first port 35 is connected to the servo valve 13, The working fluid is supplied to the first port 35 through the first fluid port 15 of the first fluid passage 15 and is transmitted to the first communication passage 49 'connected to the first port 35.

As shown in FIG. 4, the first communication passage 49 'forms a continuous passage with the first port 35 while the opening / closing spools 49 and 50 are opened, The first sensor unit 49 'connects the first port 35 and the first sensor unit 65A.

The working fluid having passed through the first fluid port 15, the first port 35 and the first communication flow passage 49 'in this manner flows into the internal space of the first sensor portion 65A, The working fluid flowing into the internal space of the first portion 65A is again transferred to the large flow valve 70 via the first discharge flow passage 44 and the first discharge port 34 '. Finally, when the working fluid is transmitted to the hydraulic cylinder 80, the hydraulic cylinder 80 is operated.

Since the working fluid is transmitted to the large flow rate valve 70 through the first sensor 65A, the flow rate of the working fluid can be accurately displayed on the measuring device connected to the first sensor 65A. Of course, the working fluid can also be transferred to the inner space of the second sensor part 65B through the second fluid port 16, the second port 36, and the second communication path 50 ' The flow rate of the working fluid is also measured through the flow path 65B.

On the other hand, when the servovalve 13 is broken and maintenance is required, the opening / closing lever 48 of the blocking valve for the electrohydraulic driving cylinder is controlled so that the working fluid does not escape from the large flow valve 70 or the hydraulic cylinder 80, To shut off the spool flow paths 49 'and 50'. Such a state is shown in Fig.

At this time, when the opening and closing spools 49 and 50 are rotated, the first port 35 and the second port 36 are blocked together while the spool flow paths 49 'and 50' are closed, and the spool flow path 49 ' , 50 'are closed, it is possible to prevent the working fluid from being discharged through the large-flow valve (70). Of course, the user may rotate the pressure lever 38 to block the pressure flow path 39 'together.

In this state, after the servo valve 13 is separated and repaired or replaced, the servo valve 13 may be mounted on the housing 30 again. After the servo valve 13 is mounted again, the opening / closing lever 48 is rotated 90 degrees. The opening and closing spools 49 and 50 are rotated so that the first port 35 and the second port 36 are simultaneously opened and the sensor unit 65 is opened through the spool flow paths 49 'and 50' So that the working fluid can flow freely into the large flow valve 70 and the hydraulic cylinder 80. [

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Although the spool housing 40 is separately coupled to the housing 30 in the above-described embodiment, the spool housing 40 may be integrally formed with the housing 30.

The sensor unit 65 is not constituted by the first sensor unit 65A and the second sensor unit 65B but may be constituted by one sensor.

10: Torque motor 13: Servo valve
30: housing 35: first port
36: second port 40: spool housing
45 ': first connection port 46': second connection port
49 ': first communication passage 50: second communication passage
49, 50: opening / closing spool 60: sensor unit
70: Large flow valve 80: Hydraulic cylinder

Claims (8)

A housing having a first port and a second port through which a fluid is delivered from the outside, and a spool space crossing the first port and the second port,
A spool opening / closing spool inserted into the spool space and having therein a spool flow path connected to and disconnected from the first port and the second port to open / close the first port and the second port through rotation;
And a sensor unit coupled to the housing and coupled to the first port and the second port through the opening and closing spool and coupled to the sensor for measuring the flow rate of at least one of the first port and the second port, A blocking valve for an electrohydraulic driven cylinder configured.
2. The spool according to claim 1, wherein a first communication passage and a second communication passage are formed in the spool passage of the opening / closing spool, the first communication passage connects and disconnects between the first port and the sensor unit, And the flow path connects and disconnects the second port and the sensor unit.
The sensor unit according to claim 1 or 2, wherein the sensor unit and the housing are connected to each other by a discharge passage, and the fluid introduced into the sensor unit through the spool passage of the opening / closing spool is discharged to the outside through the discharge passage Features a blocking valve for electrohydraulic driven cylinders.
4. The apparatus of claim 3, wherein the sensor unit comprises a first sensor unit connected to the first port and a second sensor unit connected to the second port, wherein the first sensor unit and the second sensor unit are respectively connected to the housing, Wherein the first sensor unit and the second sensor unit are connected to each other through the first discharge passage and the second discharge passage, and the fluids introduced into the first sensor unit and the second sensor unit are discharged to the outside through the first discharge passage and the second discharge passage, respectively. Blocking valve for drive cylinder.
4. The blocking valve for an electrohydraulic driving cylinder according to claim 3, wherein a pressure sensing port is provided in the housing, and a pressure sensor is selectively coupled to the pressure sensing port to measure a pressure inside the housing.
[2] The apparatus as claimed in claim 1, wherein the housing is provided with a pressure unit, and the pressure unit is provided with a pressure spool having a pressure passage formed therein, so that the pressure passage is opened and closed through rotation of the pressure spool Blocking valve.
The blocking valve for an electrohydraulic drive cylinder according to claim 1, wherein a spool housing is provided between the housing and the pressure unit, and the spool space is formed in the spool housing.
7. The blocking valve for an electrohydraulic driving cylinder according to claim 6, wherein the opening / closing spool and the pressure spool are provided with an opening / closing lever and a pressure lever, respectively, and rotated together with the opening / closing spool and the pressure spool.






KR1020150041683A 2015-03-25 2015-03-25 Blocking valve for EHPC KR20160115035A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101850114B1 (en) * 2017-01-09 2018-04-19 주식회사 제이에스티앤랩 Bypass/blocking apparatus for replacing of actuator control valve

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101085997B1 (en) 2009-01-05 2011-11-22 주식회사 제이에스티 (JST Co.,Ltd) Safety Valve Bypass Element Guard

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101085997B1 (en) 2009-01-05 2011-11-22 주식회사 제이에스티 (JST Co.,Ltd) Safety Valve Bypass Element Guard

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101850114B1 (en) * 2017-01-09 2018-04-19 주식회사 제이에스티앤랩 Bypass/blocking apparatus for replacing of actuator control valve

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