KR20170104222A

KR20170104222A - Test block of ost valve and apparatus for testing ost valve having the same

Info

Publication number: KR20170104222A
Application number: KR1020160026937A
Authority: KR
Inventors: 양천규
Original assignee: 주식회사 에네스지
Priority date: 2016-03-07
Filing date: 2016-03-07
Publication date: 2017-09-15

Abstract

The present invention relates to a test block of an over speed trip (OST) valve so as to test the operational reliability of the OST valve, and a test device of the OST valve including the same. According to the present invention, the test block of the OST valve, which selectively opens and closes a supply passage of a working fluid supplied to a hydraulic actuator for a power plant, includes: a plate-shaped body on which an OST valve is seated; a pressure port communicating with the OST valve seated on the body and supplying hydraulic oil, supplied from the outside of the body, to the OST valve; and a drain port communicating with the OST valve and draining the hydraulic oil, contained in the OST valve, to the outside of the body.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a test block for an OST valve,

The present invention relates to a test block for an OST valve and a test apparatus for an OST valve having the test block. More particularly, the present invention relates to a test block for testing the operational reliability of the OST valve and a test apparatus for the OST valve having the same.

Generally, gas turbine power generation facilities are divided into power generation, cogeneration and hybrid power generation. A gas turbine is like replacing steam, which is the working medium for a steam turbine, with gas. A gas turbine is a device that converts heat energy held by a gas into rotary power by using high-temperature and high-pressure gas in a vane similar to a steam turbine. Basically, a gas turbine is a compressor that pressurizes incoming air from outside, a combustor that generates heated gas at a high temperature and a high pressure by injecting pressurized intake air from the compressor into fuel, Into a turbine. Such a gas turbine power generation facility includes a turbine governor control system facility for controlling combustion gas, which is an operating medium flowing into the turbine.

Here, the turbine governor control system facility apparatus includes a hydraulic actuator that provides a driving force to the fuel control valve that regulates the fuel supplied to the combustor. Turbine rotation and load regulation are controlled by the fuel control valve according to the operation of the hydraulic actuator.

On the other hand, the hydraulic actuator provides a driving force to the fuel control valve to open and close the fuel supply passage in accordance with supply and discharge of the hydraulic oil. That is, the rotation and the load control of the turbine are performed in accordance with the operation of the fuel control valve interlocked with the operation of the hydraulic actuator. Generally, a servo valve is disposed between the hydraulic oil supply source and the hydraulic actuator for selectively opening and closing the hydraulic oil flow path supplied from the hydraulic actuator and discharged from the hydraulic actuator.

An emergency governor OST, which interrupts the hydraulic oil supplied to the hydraulic actuator, is connected between the servo valve and the hydraulic actuator in order to block an emergency situation caused by a sudden increase in the rotational speed of the turbine or an inflow path in which the fuel flows into the combustor in an emergency. (Over Speed Trip) valve is additionally disposed. Here, although the OST valve is described as being used in a gas turbine power generation facility, it may be used to prevent an emergency situation or an emergency situation in a thermal power and nuclear power generation facility.

The OST valve includes a piston reciprocated in accordance with the supply and discharge of separate hydraulic oil to the cylinder and the cylinder. Specifically, the OST valve selectively opens and closes the flow path between the hydraulic actuator and the servo valve by hydraulic oil supplied to and discharged from one side of the piston.

In order to test the operational reliability of the OST valve in the related art, however, it is connected between the hydraulic actuator and the servo valve, which increases the time required for the test process.

Korean Registered Patent No. 10-1314549; Hybrid type valve actuator and control method thereof

It is an object of the present invention to provide a test block of an OST valve separately configured to test the operational reliability of the OST valve that blocks the supply fluid to the hydraulic actuator in emergency situations or emergency situations of gas turbine operation and a test apparatus for an OST valve having the test block will be.

Another object of the present invention is to provide a test block of an OST valve separately configured to test the operating reliability of the OST valve for shutting off the supply fluid to the hydraulic actuator in emergency situations or emergency situations of turbines used in thermal power and nuclear power plants, The present invention also provides an apparatus for testing an OST valve.

According to the present invention, there is provided a test block for an OST valve (Over Speed Trip Valve) for selectively opening and closing a working fluid supply path supplied to a hydraulic actuator for a power plant according to the present invention, A pressure port communicating with the OST valve seated on the main body and supplying hydraulic oil supplied from the outside of the main body to the OST valve and hydraulic oil accommodated in the OST valve communicated with the OST valve, And a drain port for draining the gas to the outside.

The pressure port includes a supply port communicating with the OST valve and supplying hydraulic fluid to the OST valve, a hydraulic oil passage formed through one side of the main body and connected to the supply port, Wherein the drain port is formed at a predetermined distance from the supply port and communicates with the OST valve to discharge hydraulic oil stored in the OST valve, And a discharge connection port formed through the plate surface from the other side and connected to the discharge port to guide the hydraulic fluid discharged from the OST valve to the outside of the main body.

The test block of the OST valve is branched in the lateral direction with respect to the supply connection port and the discharge connection port to branch the hydraulic oil to measure the pressure of the hydraulic oil flowing in the supply connection port and the discharge connection port And may further include a test port.

The test port includes a supply test port for branching hydraulic oil supplied from the supply connection port to the supply port to measure the pressure of the hydraulic oil branched from the supply connection port and supplied to the supply port, And a discharge test port for branching hydraulic oil discharged from the discharge port to the discharge connection port so as to measure the pressure of the hydraulic oil discharged from the discharge port.

The supply port and the discharge port may communicate with each other in the transverse direction toward the plate surface of the main body on which the OST valve is mounted with respect to the supply connection port and the discharge connection port, respectively.

According to an aspect of the present invention, there is provided an OST valve test apparatus for selectively opening and closing a working fluid supply path supplied to a hydraulic actuator for a power plant according to the present invention, A pressure port communicating with the OST valve mounted on the main body and supplying hydraulic oil supplied from the outside of the main body to the OST valve and hydraulic oil accommodated in the OST valve communicated with the OST valve, And a test port connected to the pressure port and the drain port to branch the hydraulic oil flowing into the pressure port and the drain port, respectively, and connected to the test block, And a test for measuring the pressure of the hydraulic oil discharged from the test block Characterized in that it comprises the units is made by the test device of the valve according to OST.

The test port may include a supply test port for branching hydraulic oil supplied from the supply connection port to the supply port to measure the pressure of the hydraulic oil branched from the supply connection port and supplied to the supply port, And a discharge test port for branching hydraulic oil discharged from the discharge port to the discharge connection port so as to measure the pressure of the hydraulic oil discharged from the discharge port.

The pressure port and the drain port may further include a supply pipe and a drain pipe connected to supply hydraulic oil to the OST valve and discharge the hydraulic oil from the OST valve.

The test unit includes a supply pressure measuring unit connected to the supply test port and measuring a pressure of the hydraulic oil supplied to the OST valve, a discharge pressure sensor connected to the discharge test port for measuring the pressure of the hydraulic oil discharged from the OST valve, And a measurement unit.

Wherein the supply test port and the discharge test port are respectively branched in two in the transverse direction with respect to the supply connection port and the discharge connection port, Drain test port.

The supply pressure measuring unit and the discharge pressure measuring unit may each include a PT sensor for converting the measured pressure into an electrical signal and a pressure gauge for displaying the measured pressure in analog form.

The PT sensor may be connected to one of the two supply test ports and the discharge test port, and the pressure gauge may be connected to the other.

The details of other embodiments are included in the detailed description and drawings.

The test block of the OST valve according to the present invention and the effects of the test device of the OST valve having the same are as follows.

First, a test block is constructed in which the OST valve is arranged to measure the pressure of the hydraulic oil supplied from the OST valve and the OST valve, so that the pressure of the hydraulic oil discharged from the OST valve and the supply of the OST valve during the actual hydraulic actuator operation It is possible to reduce the time required for the operation reliability test of the OST valve.

Second, test reliability can be tested by mounting OST valves of various sizes on the test block.

1 is a first hydraulic circuit diagram of a hydraulic actuator system for a power plant,
2 is a second hydraulic circuit diagram of a hydraulic actuator system for a power plant,
3 is a third hydraulic circuit diagram of a hydraulic actuator system for a power plant,
4 is a fourth hydraulic circuit diagram of a hydraulic actuator system for a power plant,
5 is a perspective view of a test apparatus for an OST valve according to an embodiment of the present invention,
6 is a control block diagram of an OST valve test apparatus according to an embodiment of the present invention.
7 is a top view of the test block shown in Fig.

Hereinafter, a test block for an OST valve according to an embodiment of the present invention and a test apparatus for an OST valve having the same will be described in detail with reference to the accompanying drawings.

1 through 4 illustrate an OST valve test block and an OST valve test apparatus having the OST valve test block according to an embodiment of the present invention. I will reveal.

It should also be noted that the working fluid described below refers to the fluid to be drawn in and out of the hydraulic actuator, and the hydraulic oil refers to the fluid to be drawn in and out of the OST valve.

In addition, although the embodiments of the present invention are described as being applied to gas turbine power generation facilities, it is previously disclosed that they can be applied to thermal power generation and nuclear power generation facilities as well as gas turbine power generation facilities.

Fig. 1 is a first hydraulic circuit diagram of a hydraulic actuator system for a power plant, Fig. 2 is a second hydraulic circuit diagram of a hydraulic actuator system for a power plant, Fig. 3 is a third hydraulic circuit diagram of a hydraulic actuator system for a power plant, 4 is a fourth hydraulic circuit diagram of the system.

1 to 4, a hydraulic actuator system 1 for a power plant includes a working fluid supply source 3, a hydraulic actuator 5, a servo valve 9, and an OST (Over Speed Trip) valve 100 . Further, the hydraulic actuator system 1 for a power plant further includes a filter 7.

The working fluid supply source (3) supplies a working fluid for operating the hydraulic actuator (5). In addition, the working fluid supply source 3 receives the working fluid discharged from the inside of the hydraulic actuator 5 to the outside.

The hydraulic actuator 5 is connected to an unillustrated fuel control valve to provide a driving force to the fuel control valve. That is, the hydraulic actuator 5 provides a driving force to the fuel control valve to selectively open and close the inflow path of the fuel supplied to the gas turbine (not shown). The hydraulic actuator 5 is driven in accordance with the working fluid supplied to the inside and the working fluid discharged from the inside to the outside. The hydraulic actuator 5 is deactivated to shut off the supply of fuel when an emergency situation or emergency situation of the power plant, for example, more than the flow rate of the fuel required by the combustor is supplied, and in conjunction therewith, Closes the inflow path.

The filter 7 is disposed between the working fluid supply source 3 and the hydraulic actuator 5 and filters the impurities of the working fluid supplied from the working fluid supply source 3 to the hydraulic actuator 5. Such a filter 7 can filter the impurities of the working fluid to maintain the operational reliability of the hydraulic actuator 5. [

A servo valve 9 is disposed between the working fluid supply source 3 and the hydraulic actuator 5. The servo valve 9 selectively closes the flow path of the working fluid supplied from the working fluid supply source 3 to the hydraulic actuator 5 and discharged from the hydraulic actuator 5 to the working fluid supply source 3. First, when the servo valve 9 operates as shown in Fig. 1, the flow path between the working fluid supply source 3 and the hydraulic actuator 5 is closed and the working fluid supply source 3 and the hydraulic actuator 5 are prevented from flowing. Secondly, when the servo valve 9 is operated as shown in Fig. 2, the working fluid is supplied to the hydraulic actuator 5 through the port C2. Third, when the servo valve 9 operates as shown in Fig. 3, the working fluid is discharged from the hydraulic actuator 5 to the working fluid supply source 3 through the C2 port.

On the other hand, it is necessary to prevent the flow of the working fluid discharged to the supply and working fluid supply source (3) to the hydraulic actuator (5) in an emergency or emergency situation such as when the rotation speed of the gas turbine is faster than the control requirement. 4, the OST valve 100 is used to close the working fluid supply path S between the hydraulic actuator 5 and the servo valve 9 in such an emergency situation or an emergency situation.

At least one OST valve 100 is disposed between the hydraulic actuator 5 and the servo valve 9 so as to supply a working fluid. Generally, at least two OST valves 100 are disposed in the working fluid supply path S between the hydraulic actuator 5 and the servo valve 9. Since the two OST valves 100 are installed in this way, the operational reliability can be ensured even if one of the OST valves 100 is not operated in an emergency situation or an emergency situation.

5 is a perspective view of the OST valve test apparatus according to the embodiment of the present invention, FIG. 6 is a control block diagram of the OST valve test apparatus according to the embodiment of the present invention, and FIG. 7 is a cross- Fig.

The OST valve test apparatus 10 according to the embodiment of the present invention includes an OST valve 100, a test block 300, and a test unit 800, as shown in FIGS. The test apparatus 10 of the OST valve 100 according to the embodiment of the present invention further includes a supply pipe 500 and a drain pipe 600.

The OST valve 100 is used to shut off the fuel supplied to the combustor in emergency situations or emergency situations of the power plant, as described above.

The test block 300 forms a flow path for the hydraulic oil supplied to the OST valve 100 and discharged from the OST valve 100, and forms a flow path for the test. In one embodiment of the present invention, the test block 300 includes a body 310, a pressure port 330, and a drain port 350. In addition, the test block 300 of the present invention further includes a test port 370.

The main body 310 is provided in a plate shape and the OST valve 100 is seated on the main body 310. Although the main body 310 is provided in the form of a rectangular plate as an embodiment of the present invention, it may be formed in various plate shapes as well as a circular plate shape.

The pressure port 330 communicates with the OST valve 100 mounted on the main body 310 and supplies hydraulic oil supplied from the outside of the main body 310 to the OST valve 100. The pressure port 330 is formed through the inside of the main body 310. The pressure port 330 includes a supply port 332 and a supply connection port 334. The supply port 332 communicates with the OST valve 100 to supply the hydraulic oil to the OST valve 100. The supply connection port 334 is formed through the inside of the main body 310 from the one side of the main body 310 and connected to the supply port 332 to supply the hydraulic oil supplied from the outside of the main body 310 to the supply port 332. [ (332).

The drain port 350 communicates with the OST valve 100 to drain the hydraulic oil accommodated in the OST valve 100 to the outside of the main body 310. The drain port 350 is formed through the inside of the main body 310. The drain port 350 of the present invention includes a discharge port 352 and a discharge connection port 354. The discharge port 352 communicates with the OST valve 100 to discharge the hydraulic oil accommodated in the OST valve 100. The discharge connection port 354 is formed to extend from the other side of the main body 310 along the plate surface and is connected to the discharge port 352 to guide the hydraulic oil discharged from the OST valve 100 to the outside of the main body 310. Specifically, the discharge connection port 354 is formed through the inside of the main body 310 along the plate surface from the other side of the main body 310 opposed to the supply connection port 334. Of course, the mutual opposing positions of the supply connection port 334 and the discharge connection port 354 may be changeable in design.

The supply port 332 and the discharge port 352 are connected to the supply connection port 334 and the discharge connection port 354 in the lateral direction toward the plate surface of the main body 310 on which the OST valve 100 is seated, . That is, the supply connection port 334 is formed in the main body 310 along the plate surface of the main body 310, and the supply port 332 is vertically penetrated through the supply connection port 334 in the transverse direction . The discharge connection port 354 is formed in the body 310 along the surface of the main body 310 and the discharge port 352 is vertically penetrated in the transverse direction with respect to the through- .

On the other hand, the test port 370 is branched in the lateral direction with respect to the supply connection port 334 and the discharge connection port 354, respectively. The test port 370 is formed in the main body 310 to measure the pressure of the hydraulic fluid flowing in the supply connection port 334 and the discharge connection port 354. The test port 370 of the present invention includes a supply test port 372 and a discharge test port 374. The supply test port 372 and the discharge test port 374 branch two in the lateral direction with respect to the supply connection port 334 and the discharge connection port 354, respectively. The two branched supply test port 372 and discharge test port 374 are only one embodiment, the number of which is design-changeable. The test unit 800 is connected to the supply test port 372 and the discharge test port 374.

The supply pipe 500 and the drain pipe 600 are connected to the pressure port 330 and the drain port 350, respectively. Specifically, the supply pipe 500 is connected to the supply connection port 334 of the pressure port 330, and the drain pipe 600 is connected to the discharge connection port 354 of the drain port 350. The hydraulic oil supplied to the supply pipe 500 and the hydraulic oil discharged to the drain pipe 600 are respectively branched into the supply test port 372 and the discharge test port 374 and the pressure is measured by the test unit 800.

The test unit 800 is then connected to a test block 300 to measure the pressure of the hydraulic fluid discharged from the supply and test block 300 to the test block 300. Specifically, the test unit 800 measures the pressure of the hydraulic oil supplied to the OST valve 100 through the pressure port 330 and measures the pressure of the hydraulic oil discharged from the OST valve 100 to the drain port 350 . The test unit 800 of the present invention includes a supply pressure measuring unit 810 and an exhaust pressure measuring unit 830. [ The test unit 800 further includes a control unit 850 and a display unit 870.

The supply pressure measuring unit 810 is connected to the supply test port 372 to measure the pressure of the hydraulic oil supplied to the OST valve 100. That is, the supply pressure measuring unit 810 measures whether the pressure of the hydraulic oil required for the OST valve 100 used in the actual hydraulic actuator system 1 is applied. The supply pressure measuring unit 810 of the present invention includes a supply PT sensor 812 and a supply pressure gauge 814. The supply PT sensor 812 and the supply pressure gauge 814 are connected to two supply test ports 372. In one embodiment of the present invention, Respectively. The supply PT sensor 812 transmits a sensing signal to the control unit 850 so that the sensed pressure of the supply hydraulic fluid is stored and displayed. On the other hand, the supply pressure gauge 814 is provided in an analog manner so that it can be seen by the test performer testing the OST valve 100.

The discharge pressure measuring unit 830 is connected to the discharge test port 374 to measure the pressure of the hydraulic oil discharged from the OST valve 100. In detail, the discharge pressure measuring unit 830 measures the pressure of the hydraulic oil discharged from the OST valve 100 used in the actual hydraulic actuator system 1. The discharge pressure measurement unit 830 includes a discharge PT sensor 832 and an discharge pressure gauge 834. [ The discharge test port 374 of the present invention is branched into two for the discharge connection port 354 and the discharge PT sensor 832 and the discharge pressure gauge 834 are connected to the two discharge test ports 374, do. The discharge PT sensor 832 transmits a sensing signal to the control unit 850 so as to store and display the pressure of the hydraulic oil delivered from the OST valve 100. The discharge pressure gauge 834 is then provided in an analog manner so that it can be seen by the test person testing the operational reliability of the OST valve 100.

The control unit 850 and the display unit 870 are provided to process and display the pressure of the supply hydraulic oil and the pressure of the discharge hydraulic oil measured by the supply pressure measuring unit 810 and the discharge pressure measuring unit 830. [ The control unit 850 performs signal processing such that the sensing signal transmitted from the supply PT sensor 812 of the supply pressure measuring unit 810 and the discharge PT sensor 832 of the discharge pressure measuring unit 830 is outputted to the display unit 870 do. The display unit 870 is provided to display an output of the sensing signal processed by the controller 850.

The operation of the test apparatus 10 of the OST valve 100 according to the embodiment of the present invention is as follows.

First, the OST valve 100 is mounted on the main body 310 such that the supply port 332 and the discharge port 352 of the test block 300 communicate with the OST valve 100. The supply pipe 500 and the drain pipe 600 are connected to the pressure port 330 and the drain port 350, respectively. The supply PT sensor 812 and the supply pressure gauge 814 and the discharge PT sensor 832 and the discharge pressure gauge 834 are connected to the two supply test ports 372 and the two discharge test ports 374, do.

And supplies the hydraulic oil to the OST valve 100 through the supply pipe 500. The hydraulic fluid supplied from the supply pipe 500 flows in the order of the supply connection port 334 and the supply port 332 of the pressure port 330 and is supplied to the OST valve 100. The supply PT sensor 812 and the supply pressure gauge 814 connected to the two supply test ports 372 branched to the supply connection port 334 measure the pressure of the hydraulic oil supplied to the OST valve 100 . The signal sensed by the supply PT sensor 812 is transmitted to the control unit 850 and displayed on the display unit 870 and the pressure measurement value admitted to the supply pressure gauge 814 is presented to the test person.

On the other hand, hydraulic oil supplied from the supply pipe 500 is blocked, and the hydraulic oil accommodated in the OST valve 100 is discharged by the drain pipe 600. The hydraulic fluid discharged from the OST valve 100 flows in the order of the discharge port 352, the discharge connection port 354 and the drain pipe 600 and finally discharged to the outside of the test block 300. The discharge PT sensor 832 and the discharge pressure gauge 834 connected to the two discharge test ports 374 branched to the discharge connection port 354 measure the pressure of the hydraulic oil discharged from the OST valve 100 do. The signal sensed by the evacuation PT sensor 832 is transmitted to the control unit 850 and displayed on the display unit 870 and the pressure measurement value seen by the evacuation pressure gauge 834 is visible to the test person.

Therefore, it is possible to construct a test block in which the OST valve is arranged to measure the pressure of the hydraulic oil supplied from the OST valve and the OST valve, so that the pressure of the hydraulic oil discharged from the OST valve and the supply pressure to the OST valve during the actual operation of the hydraulic actuator It is possible to reduce the time required for the operation reliability test of the OST valve.

In addition, OST valves of various sizes can be mounted on the test block to test the operational reliability, thereby further expanding the test coverage.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, . Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: OST valve (Over Speed Trip) 300: Test block
310: main body 330: pressure port
332: Supply port 334: Supply connection port
350: drain port 352: exhaust port
354: Discharge connection port 370: Test port
372: Supply Test Port 374: Discharge Test Port
800: Test unit 810: Supply pressure measuring unit
830: Exhaust pressure measuring unit

Claims

A test block for an OST valve (Over Speed Trip Valve) that selectively opens and closes a supply passage for a working fluid supplied to a hydraulic actuator for a power plant,
A plate-like body on which the OST valve is seated;
A pressure port communicating with the OST valve mounted on the main body and supplying hydraulic oil supplied from the outside of the main body to the OST valve;
And a drain port communicating with the OST valve for draining the hydraulic oil accommodated in the OST valve to the outside of the main body.

The method according to claim 1,
Wherein the pressure port includes a supply port communicated with the OST valve to supply hydraulic oil to the OST valve, a hydraulic pump connected to the supply port and supplied from the outside of the main body, And a supply connection port for guiding to the supply port,
Wherein the drain port includes a discharge port formed at a predetermined distance from the supply port and communicating with the OST valve to discharge hydraulic oil accommodated in the OST valve, And a discharge connection port for guiding the hydraulic fluid discharged from the OST valve to the outside of the main body.

3. The method of claim 2,
And a test port for branching the hydraulic oil in the horizontal direction to the supply connection port and the discharge connection port and for branching the hydraulic oil to measure the pressure of the hydraulic oil flowing in the supply connection port and the discharge connection port, Test block of OST valve.

The method of claim 3,
The test port includes:
A supply test port which branches from the supply connection port and branches the hydraulic oil supplied from the supply connection port to the supply port to measure the pressure of the hydraulic oil supplied to the supply port;
And an exhaust test port that branches off from the discharge connection port and branches the hydraulic oil discharged from the discharge port to the discharge connection port to measure a pressure of the hydraulic oil discharged from the discharge port. block.

3. The method of claim 2,
Wherein the supply port and the discharge port are communicated with each other in the lateral direction toward the plate surface of the main body on which the OST valve is mounted with respect to the supply connection port and the discharge connection port, respectively.

A test apparatus for an OST valve (Over Speed Trip Valve) for selectively opening and closing a supply path for a working fluid supplied to a hydraulic actuator for a power plant,
A pressure port communicating with the OST valve and supplying hydraulic oil supplied from the outside of the main body to the OST valve; a pressure port communicating with the OST valve and being accommodated in the OST valve; A test port having a drain port for draining the hydraulic oil to the outside of the main body and a test port branched for the pressure port and the drain port to branch the hydraulic oil flowing to the pressure port and the drain port;
And a test unit connected to the test block for measuring the pressure of the hydraulic fluid supplied to the test block and discharged from the test block.

The method according to claim 6,
Wherein the pressure port includes a supply port communicated with the OST valve to supply hydraulic oil to the OST valve, a hydraulic pump connected to the supply port and supplied from the outside of the main body, And a supply connection port for guiding to the supply port,
Wherein the drain port includes a discharge port formed at a predetermined distance from the supply port and communicating with the OST valve to discharge hydraulic oil accommodated in the OST valve, And a discharge connection port for guiding the hydraulic oil discharged from the OST valve to the outside of the main body.

8. The method of claim 7,
The test port includes:
A supply test port which branches from the supply connection port and branches the hydraulic oil supplied from the supply connection port to the supply port to measure the pressure of the hydraulic oil supplied to the supply port;
And an exhaust test port that branches off from the discharge connection port and branches the hydraulic oil discharged from the discharge port to the discharge connection port to measure a pressure of the hydraulic oil discharged from the discharge port. Device.

The method according to claim 6,
Wherein the pressure port and the drain port further include a supply pipe and a drain pipe connected to supply hydraulic oil to the OST valve and discharge the hydraulic oil from the OST valve.

9. The method of claim 8,
The test unit includes:
A supply pressure measuring unit connected to the supply test port and measuring a pressure of the hydraulic oil supplied to the OST valve;
And an exhaust pressure measuring unit connected to the exhaust test port and measuring a pressure of the hydraulic oil discharged from the OST valve.

11. The method of claim 10,
Wherein the supply test port and the discharge test port are branched two in the horizontal direction with respect to the supply connection port and the discharge connection port, respectively,
Wherein the supply pressure measuring unit and the discharge pressure measuring unit are respectively connected to two supply test ports and the discharge test port.

12. The method of claim 11,
Wherein the supply pressure measuring unit and the discharge pressure measuring unit each include a PT sensor for converting the measured pressure into an electrical signal and a pressure gauge for displaying the measured pressure in analog form.

13. The method of claim 12,
Wherein the PT sensor is connected to one of the two supply test ports and the discharge test port, and the pressure gauge is connected to the other one of the two supply test ports and the discharge test port.