baber/WOPTO huggingface dataset:
Patent KR-20110012454-A (KR)
Title: Method of manufacturing semiconductor device
Inventor: CHAE KWANG KEE
IPC: H01L21/306
Filed: 2009-07-30
Abstract: PURPOSE: A method of manufacturing a semiconductor device is provided to protect damage and SAC fail of a semiconductor substrate by completely removing fume. CONSTITUTION: A plurality of patterns(P) are formed on a semiconductor substrate(100). A gate insulating layer, a gate conductive layer, and hard mask layer are laminated. An inter-layer insulating layer(102) consisting of an oxide layer is formed on the outcome of the semiconductor substrate. A mask pattern exposing a hole for a landing plug is formed on the inter-layer insulating layer, and the hole simultaneously exposes the interval between patterns to outside.
Patent KR-20110012553-A (KR)
Title: Opening and closing apparatus for window glass in vehicles
Inventor: LEE MYOUNG HYUN
IPC: B60J1/17
Filed: 2009-07-30
Abstract: PURPOSE: A device for opening/closing a vehicle window is provided to reduce the number of parts since a guide rail, a mount, an anti-interference unit and a protrusion are integrally formed. CONSTITUTION: A device for opening/closing a vehicle window comprises a carrier, a panel(50), an actuator and a power transfer unit. The carrier supports window glass. The guide rail is formed integrally with the panel. The carrier is slidably installed on the guide rail. The panel is coupled to a door plate(10). The actuator is installed in the panel. The power transfer unit converts the driving force of the actuator to the linear movement of the carrier.
Patent KR-20090090289-A (KR)
Title: Vegetable sliced cut
Inventor: JEE SUNG SUN
IPC: A47J17/00
Filed: 2009-07-31
Abstract: A chef's knife is provided to adjust distances and angles among knife blades, thereby cutting various foods. A chef's knife includes knife blades(1). End parts of the knife blade are put into a mole and aluminum is melt and poured to the mold. A distance(4) of a blade surface(10) is adjusted according to a use area. An angle(5) of a surface of the chef's knife is adjusted so that foods are cut widely and long.
Patent KR-20110012809-A (KR)
Title: Method for preserving tricholoma matsutake safely and effectively throughout long period of time
Inventor: CHUNG BONG HWAN
IPC: A23B7/024
Filed: 2009-07-31
Abstract: PURPOSE: A safe and stable storing method of tricholoma matsutake is provided to store the tricholoma matsutake for a long time in the useful condition. CONSTITUTION: A safe and stable storing method of tricholoma matsutake comprises the following steps: washing the tricholoma matsutake, and freeze-drying; and vacuum packing the freeze-dried tricholoma matsutake. The freeze-drying process is performed for 72~96hours by lowering the temperature at -40deg C and slowly increasing the temperature at 30deg C.
Patent KR-20110014334-A (KR)
Title: Chair for correcting attitude
Inventor: YOO BYOUNG WOOK
IPC: A47C9/10
Filed: 2009-08-05
Abstract: PURPOSE: A chair for posture correction is provided, which can effectively correct seat occupant's posture using a tact switch and an alarm unit. CONSTITUTION: A chair for posture correction comprises: a seat plate(110) in which user's hips are settled; a backboard part(120) which is pivotally hinge-coupled with the rear end of the seat plate and supports seat occupant's back; a finger pressure protrusion(130) contacting the lumbar portion of the seat occupant back in the inner center of the backboard part; a tact switch(140) which is installed in the backboard part; an alarm part(150); and a holder(160) installed at the rear side of the backboard part.
Patent KR-20110014721-A (KR)
Title: Connector assembly for can communication devices
Inventor: KWAG JUNG YOUNG
IPC: H01R12/70
Filed: 2009-08-05
Abstract: PURPOSE: A connector assembly for a communications device is provided to increase the efficiency of a task of an assembly worker is provided to simplify a manufacturing process of the connector by mounting the connector assembly to a can communication device. CONSTITUTION: A CAN(Controller Area Network) interface unit(63) of a second connector(60) receives and transmits a CAN message. A device controller(67) of the second connector controls the device connected to a connector assembly according to data of the received CAN message. ID selecting units are respectively included in a first connector(40) or a second connector. The ID selecting unit receives the ID of the connected device from a user.
Patent KR-20110015109-A (KR)
Title: 풍력 발전장치
Inventor: CHOI YOUNG GU
IPC: F03D3/02
Filed: 2009-08-07
Abstract: 본 발명은 미풍에서도 풍차의 회전력을 증대시킬 수 있어 발전효율을 높일 수 있는 풍력 발전장치에 관한 것이다. 
     종래의 풍력 발전장치는 시설규모에 비하여 발전량이 매우 적다는 문제점이 있는데, 이를 해결하기 위하여 본 발명은 수평으로 설치된 제1풍차(10)가 회전함에 따라 회전력이 증속되도록 구성된 송풍팬(32)이 내측에 구비되고, 상기 송풍팬(32)의 회전에 의해 발생된 바람이 외부로 배출될 수 있도록 송풍관(31)이 형성된 송풍장치(30)와, 상기 송풍관(31)의 바람에 의해 회전함으로써 발전을 행하는 경사지게 설치된 제2풍차(40)로 구성된 것을 특징으로 하는 풍력 발전장치를 제공한다. 
     따라서 본 발명에 의하면, 바람의 방향과 무관하게 지속적인 회전을 하는 제1풍차가 송풍팬에 회전력을 전달하여 배출되는 바람에 의해 제2풍차를 회전시켜 적은 에너지로 발전을 행함으로써 발전효율을 증대시킬 수 있는 효과가 있다. 
       
     풍차, 풍력, 발전, 수평, 회전, 증속
Patent KR-20110016345-A (KR)
Title: Display apparatus
Inventor: LEE YUN GYU
IPC: G06F3/041
Filed: 2009-08-11
Abstract: PURPOSE: A display device is provided to prevent the loss of incidented light from a light source, thereby increasing a touch sensing capability using the light source. CONSTITUTION: A display unit is formed on a substrate. A sealing substrate(1300) is arranged to face the display unit. A polarization layer(1400) is arranged to adjacent to the sealing substrate. An optical function layer(1500) is formed between the sealing substrate and the polarization layer and includes a refractive index of the sealing substrate smaller than the refractive index.
Patent KR-20100020932-A (KR)
Title: Distal guiding catheter
Inventor: HWANG SEON MOON
IPC: A61M25/088
Filed: 2009-08-13
Abstract: PURPOSE: A distal part guiding catheter is provided to easily operate multiple operations inside blood vessels, and to insert the catheter inside the proximal part of a target vessel. CONSTITUTION: A distal part guiding catheter comprises the following; a distal part(110) formed with a soft material to maximally get near a target vessel with a lesion; and a blood circulation hole(111) formed in the side of catheter to maintain a smooth flow of the blood. The catheter shows a minimum thickness and external diameter while including enough inner capacity for inner blood vessel operation. The inside diameter of the catheter is 0,056~0,072 inches.
Patent KR-20100021982-A (KR)
Title: Image processing apparatus, image processing method, and program
Inventor: NAKAO DAISUKE
IPC: G06T3/00
Filed: 2009-08-17
Abstract: PURPOSE: An image processing apparatus, an image processing method, and a program thereof are provided to accomplish the minute expression of the operation trend of the time direction. CONSTITUTION: The layer dividing unit(31) divides the input frame picture data item into the mobile subject layer and background layer. In the picture synthesis processing of the composition processor(33), the top priority is given to the mobile subject layer of the recent input frame picture data item. The second priority is given to the mobile subject layer of the frame picture data item. The frame picture data item is related to the composite process which previously operated. The layer picture synthesis processing operates about the partial domain of the existing composition image data item.
Patent KR-20110019505-A (KR)
Title: Integrated emissions trading system and its method for greenhouse gases using the online networks
Inventor: YOON INTAEK
IPC: G06Q30/06
Filed: 2009-08-20
Abstract: PURPOSE: A system and a method for trading an integrated carbon credit through an online communication network are provided to trade all carbon credits which are produced in a domestic market under one carbon credit trading system. CONSTITUTION: The first ~ Nth terminals(10a~10n) provide basic information about a performing person according to a greenhouse gas reduction business field and the amount of reducing a greenhouse gas. An account opening system(120) opens an account to enable an individual person and an institution to participate in purchasing a carbon credit. A registration/unit converting system(20) directly registers various kinds of carbon credits for sale or separates the carbon credits by an integrated carbon credit unit. A transfer/liquidation system(50) automatically notifies a purchaser and a seller of a trade and transfers or liquidates a traded carbon credit if a carbon credit is successfully traded in a multi carbon credit trade assisting host server.
Patent KR-20110020661-A (KR)
Title: Ceramic substrate and manufacturing method thereof
Inventor: SUNG JE HONG
IPC: H05K3/46
Filed: 2009-08-24
Abstract: PURPOSE: A ceramic substrate and a manufacturing method thereof are provided to efficiently form the fine electrode pattern and the common electrode pattern by using the photo etching method and the screen printing method at the same time. CONSTITUTION: A ceramic substrate comprises a ceramic laminated body(100), a minute electrode pattern(110a), and a common electrode pattern(120a). A minute electrode pattern domain(A) and a common electrode pattern area(B) are arranged on the ceramic laminated body. The screen printing method is used when embodying the common electrode pattern area.
Patent KR-20110021178-A (KR)
Title: Brownout detector
Inventor: KIM MYEUNG SU
IPC: G05F3/02
Filed: 2009-08-25
Abstract: PURPOSE: A brownout detector is provided to turn on/off a switching element by comparing a divided power voltage with the driving voltage of a transistor. CONSTITUTION: In a brownout detector, a voltage divider(310) comprises a plurality of active diodes(T11,T12,T13,T14) and distributes a power supply voltage. A comparison unit(320) comprises a switching element and compares a driving voltage of the switching element with an input voltage. The comparison unit turns on/off the switching element. The power supply voltage is intercepted according to the on/off of the switching element. A buffer part(330) generates the output voltage.
Patent KR-20110022105-A (KR)
Title: 공기 떡볶이떡 제조방법
Inventor: GIM HYEONG RYEO
IPC: A21C11/22
Filed: 2009-08-27
Abstract: 본 발명은 공기 떡볶이떡 제조방법에 관한 것으로, 성형틀(4) 전면의 떡토출구(5) 정중앙에 위치되는 다수의 배출구(7)가 일정간격으로 형성되고, 상기 성형틀(4)의 종방향으로 관통되는 공기투입관(6)이 구비되고; 상기 공기투입관(6)에 에어호스(10)로 연결되어  펌핑작동되는 에어펌프(9)가 구비되며; 상기 공기투입관(6) 상에 설치되고 상기 에어펌프(9)에 전기적으로 연결되어 상기 에어펌프(9)의 펌핑작동시 배출구(7)를 통하여 공기주입공간(12)이 형성되는 공기 떡볶이떡이 제공된다. 
     그러므로, 성형틀(4)의 떡토출구(5)로 반죽된 원료가 압출되는 동안에 반복적인 에어펌프(9)의 펌핑작동으로 공기가 발생되고, 발생된 공기가 공기투입관(6)으로 공급되어 배출구(7)를 통해 압출되는 원료의 중앙부위에 공기를 주입시켜서 내부 중앙부위에 공기주입공간(12)이 형성된 떡볶이떡(11)을 제조할 수 있으며, 제조된 떡볶이떡(11)이 공기주입공간(12)으로 인하여 얇아지므로 질기지 않고 식감이 부드러우며, 떡볶이를 만들어 섭취할시 양념이 입안에서 쉽게 섞이므로 한결 미각을 돋을 수 있어 한층 더 맛있는 떡볶이를 즐길 수 있을 뿐 아니라, 떡볶이떡(11)이 입안에서 씹힐시 공기주입공간(12)으로 인해 떡볶이의 표피가 얇아져 쉽게 터지므로 섭취자의 흥미를 유발하여 먹는 즐거움을 증대시킬 수 있는 등의 장점이 있다. 
       
     공기투입관, 배출구, 에어펌프, 공기주입공간
Patent KR-20110022148-A (KR)
Title: Air conditioner for vehicles
Inventor: HAN GYU IK
IPC: B60H1/12
Filed: 2009-08-27
Abstract: PURPOSE: An air conditioner for vehicles is provided to increase wind speed for the detection of air temperature inside a vehicle regardless of air-conditioning modes and the position of a temperature adjusting door. CONSTITUTION: An air conditioner for vehicles comprises an air conditioner case(110), an evaporator, a heater core, and an aspirator(150). An air intake hole is formed in the inlet of the air conditioner case. A defrost vent, a face vent, and a floor vent are formed in an outlet of the air conditioner case. The evaporator and a heater core are installed on an air flow path inside the air conditioner case. The aspirator sucks air inside a vehicle by the generation of venturi action due to air flowing out from the inside of the air conditioner case. A connection duct(140) is installed between the air conditioner case and the aspirator, air is supplied from the multiple spots of the air conditioner case to the aspirator, and the wind speed is increased.
Patent KR-20110022765-A (KR)
Title: Dual type air conditioning system for automotive vehicles
Inventor: BYON SANG CHUL
IPC: F28D7/00
Filed: 2009-08-28
Abstract: PURPOSE: A dual type air conditioner for vehicles is provided to improve the cooling capacity of an evaporator by reduction in the temperature of refrigerant introduced to an evaporator using an internal heat exchanger. CONSTITUTION: A dual type air conditioner for vehicles comprises a compressor(10), a condenser(20), a front seat air-conditioning unit(30) equipped with an evaporator(34), a back seat air-conditioning unit(40) equipped with an evaporator(45), and an internal heat exchanger(50). The evaporator generates cool air from the refrigerant which is compressed and compacted by the compressor and the condenser. The internal heat exchanger exchanges heat between high-temperature refrigerant discharged from the condenser and low-temperature refrigerant flowing in the compressor. The refrigerant discharged from the evaporator of the front seat air-conditioning unit passes through the internal heat exchanger. The refrigerant which has passed through the internal heat exchanger is mixed with the refrigerant discharged from the evaporator of the back seat air-conditioning unit and flows in the compressor again.
Patent KR-20100027051-A (KR)
Title: System and method for measuring the axial movement of a movable part in rotation
Inventor: DESBIOLLES PASCAL
IPC: G01L5/00
Filed: 2009-08-28
Abstract: PURPOSE: A system and a method for measuring the axial movement of a component capable of a rotary motion are provided to measure the axial movement of the component when the system is rotated. CONSTITUTION: A system for measuring an axial movement of a component capable of a rotary motion comprises a magnetic encoding device and magnetic field detecting devices. The magnetic encoding device has more than one annular track and multiple north and south poles. The annular track is fixed to a component capable of a rotary motion. The north and south poles are divided on the annular track. The magnetic field detecting devices are separated from each other and comprise a first magnetic sensor(5) and a second magnetic sensor(6).
Patent KR-20110031584-A (KR)
Title: Apparatus for treating food waste
Inventor: HWANG YOUNG KYU
IPC: B09B3/00
Filed: 2009-09-21
Abstract: PURPOSE: A hybrid food waste treatment apparatus is provided to offer a porous organic and inorganic hybrid formed by combining a center metallic ion with organic ligand. CONSTITUTION: A hybrid food waste treatment apparatus(1) comprises the following: a treatment chamber(2) for treating food waste; an air inhalation passage(7) supplying air to the treatment chamber; an exhaustion passage(9) discharging the air to the outside; a dehumidification unit(10) including an adsorber, connected to the exhaustion passage; and a deodorizing unit(11) including a deodorizing agent and a catalyst.
Patent KR-20100036979-A (KR)
Title: Receiving apparatus, receiving method, and program
Inventor: KAWAUCHI HIDETOSHI
IPC: H04W56/00
Filed: 2009-09-29
Abstract: PURPOSE: By selecting an interpolation filter obtaining an equalization signal of a superior quality the receiving device, and the receiving method and program practice the frequency interpolation processing about the signal of mainline. CONSTITUTION: A symbol synchronization part(107) is composed of the symbol synchronization controller(131), third symbol positioning units(132, 133, 134) it scores the first, the switch(135), and the symbol sync flag generating unit(136) and control DFT flag generating unit(137). Controller inputs the demodulation start signal directing the initiation of the demodulation to the symbol synchronization controller. The symbol synchronization controller successively outputs the changeover signal in the switch. The switch selects one of the symbol locations pitching as described above. The symbol sync flag generating unit outputs the symbol sync flag showing the symbol location pitching as described above in the demodulation FFT part. The DFT flag generating unit is created the DFT flag based on the symbol location.
Patent KR-20110036232-A (KR)
IPC: G01M99/00
Filed: 2009-10-01
Abstract: 본 발명은 엔진 노크센서의 고장진단 방법을 개시한다. 본 발명에 따른 엔진 노크센서의 고장진단 방법은, 엔진 노크센서의 입력단으로 기 설정된 발진조건에 따라 에러 판별 전압을 인가하는 에러원인 판별 설정 단계 및 엔진 노크센서의 입력단에 대한 에러 판별 전압의 진폭이 기 설정된 기준진폭 이상인지 여부에 따라 엔진 노크센서의 에러 원인을 판별하기 위한 에러원인 판별 단계를 포함하는 것을 특징으로 한다. 따라서, 본 발명은 엔진 노크센서가 저전압 입력으로 인한 에러로 진단되는 경우 엔진 노크센서의 고유 특성을 이용하여 진단한 에러의 원인이 엔진 노크센서의 신호라인 단선으로 인한 것인지 아니면 엔진 노크센서가 헐겁게 회로 연결됨에 따른 것인지에 대한 진단을 실행할 수 있다. 
       
     엔진 노크센서
Patent KR-20100014205-A (KR)
Title: Shoe with 3-layer type cushion sole
Inventor: KANG DAE SUNG
IPC: A43B13/16
Filed: 2009-10-06
Abstract: PURPOSE: A three stage cushion outsole is provided, which provides excellent three stage cushion to the rear heel of the shoe insole. CONSTITUTION: A three stage cushion outsole comprises a shank buried under the outsole main body(2); a cushion groove(3) which is formed so that the lower can be opened in the rearward bottom surface of the outsole main body; and cushion material attached to the cushion groove. The cushion material includes a second cushion(5) formed into the hardness lower than the outsole main body; and a first cushion(4) with lower hardness than the second cushion. In the bottom surface of the cushion groove, second cushion is attached in the state that the first cushion is intervened.
Patent KR-20110037640-A (KR)
Title: Combination type cooling system for elimination of heat of reaction at fischer-tropsch slurry bubble column reactor
Inventor: LEE HO TAE
IPC: C10J3/20
Filed: 2009-10-07
Abstract: PURPOSE: A combination type cooling system for eliminating reaction heat of a fischer-tropsch slurry bubble column reactor is provided to separately control the side reaction temperature of the reactor. CONSTITUTION: A combination type cooling system for eliminating reaction heat of a fischer-tropsch slurry bubble column reactor comprises the following: a first latent heat cooling pipe(31) horizontally installed on the upper side of a reaction chamber of the reactor; a second latent heat cooling pipe(32) horizontally installed on an insertion chamber(26) of the reactor; plural third latent heat cooling pipes(33) vertically connecting the first and second latent heat cooling pipes; inner tubes(40) installed in the inside of the latent heat cooling pipes; and a cooling pipe(50).
Patent KR-20090117682-A (KR)
Title: Apparatus for preventing dry of steam rice in electronical pressure rice cooker
Inventor: ROH KYOUNG HWA
IPC: A47J27/08
Filed: 2009-10-20
Abstract: PURPOSE: A rice drying prevention device for an electric pressure heating cooker is provided to prevent rice from being dried and the taste from being changed by suppressing moisture evaporation. CONSTITUTION: A rice drying prevention device for an electric pressure heating cooker comprises a body(110) of a circular plate inserted into an inner pot(13). The body has a handle(120), a leg(130), and an automatic regulator(140). The handle is formed on the upper side of the body. The leg part maintains constant horizontality and intervals to the bottom of the inner pot on a bottom side of the main body. The automatic regulator adjusts pressure between the inner pot and the body at the one side of the body.
Patent KR-20100044117-A (KR)
Title: Hydraulic circuit for construction machinery
Inventor: ASANO MASAO
IPC: B66C3/04
Filed: 2009-10-20
Abstract: PURPOSE: A hydraulic circuit for construction machinery is provided to improve workability by reducing the time and labor required for replacing an operating unit. CONSTITUTION: A hydraulic circuit for construction machinery comprises variable relief valves(82,83), check valves(93,94), and a relief pressure converter. The variable relief valves set the maximum hydraulic pressure of first and second pipelines(75,76). The first pipeline is located between a bottom chamber(28c) of a hydraulic cylinder(28) and a control valve(66), and the second pipeline is located between a rod chamber(28d) of the hydraulic cylinder and the control valve. The check valves are parallelly connected to the variable relief valves. The relief pressure converter selectively converts the set pressure of the variable relief valves into high-relief pressure and low-relief pressure.
Patent KR-20100062908-A (KR)
Title: Apparatus for compensating error of time to digital converter
Inventor: PARK MI JEONG
IPC: H03L7/085
Filed: 2009-10-23
Abstract: PURPOSE: An error correction apparatus of a time to digital converter is provided to simply select a time resolution of a TDC by changing a digital control value without changing design of the apparatus. CONSTITUTION: A division multiplying unit(310) generates a first to a(N-1) division delay phase by subdividing the delay phase as N times. An adding unit(330) generates the first to the(N-1) phase error by respectively adding the first to the(N-1) division delay phase on the phase error. A comparison unit(350) gains a phase error correction value including a value closing with real phase error among the phase error and the first to the(N-1) phase error. The division multiplying unit includes a first to a(N-1) multiplier capable of generating the first to the(N-1) division delay phase.
Patent KR-20110047815-A (KR)
IPC: H01L21/28
Filed: 2009-10-30
Abstract: 본 발명은 값비싼 포토공정을 사용하지 않으면서도 특정영역을 오버레이문제없이 오픈시킬 수 있는 반도체장치 제조 방법을 제공하기 위한 것으로, 본 발명의 반도체장치 제조 방법은 반도체기판을 식각하여 복수의 트렌치를 형성하는 단계; 상기 반도체기판의 상부에 돌출부를 형성하도록 상기 트렌치 내부에 일부 갭필된 희생막을 형성하는 단계; 상기 희생막을 포함한 전면에 경사증착법(Tilt deposition)을 이용하여 식각장벽막을 형성하는 단계; 상기 식각장벽막을 일부 식각하여 상기 희생막의 표면을 노출시키는 식각장벽막패턴을 형성하는 단계; 및 상기 식각장벽막패턴을 식각배리어로 하여 상기 희생막을 식각하여 상기 트렌치의 일측 측벽을 오픈시키는 단계를 포함하고, 상술한 본 발명은 특정부위를 오픈시키기 위해 값비싼 포토장비를 사용하지 않아도 되므로 비용을 절감할 수 있는 효과가 있으며, 또한, 마스크 공정이 생략되므로써 공정의 수를 줄일 수 있을뿐만 아니라 식각장벽막패턴에 자기정렬되어 오픈영역이 형성되므로 오버레이 문제가 없다. 
       
     트렌치, 경사증착방법, 물리기상증착법, 언도우프드층, 트렌치, 식각장벽막
Patent KR-20110048188-A (KR)
Title: Heater for heating vacuum line and vacuum processing apparatus having the same
IPC: H01L21/324
Filed: 2009-11-02
Abstract: PURPOSE: A heater for heating vacuum line and a vacuum processing apparatus having the same are provided to form a heating element film on the surface of a heater boy, thereby removing a process of forming a pattern groove on the surface of the heater body. CONSTITUTION: In a heater for heating vacuum line and a vacuum processing apparatus having the same, a chamber(110) provides a space for processing a substrate. A substrate heater(120) heats the substrate which is arranged in the space for processing the substrate. A material supply unit(130) supplies a material to a substrate. A vacuum line(140) is interlinked with the chamber and is extended to the outside of the chamber. A vacuum pump(150) is arranged in the end of a vacuum line. A heater(200) for the vacuum line is formed in order to protect the vacuum line.
Patent KR-20110054582-A (KR)
Title: Drain valve for protecting from frozen breaking
Inventor: JO IN HO
IPC: B65G69/20
Filed: 2009-11-18
Abstract: PURPOSE: A drain valve for preventing the free-burst of a pipe is provided to automatically discharge fluid from a pipe in response to reduced water pressure of the pipe. CONSTITUTION: A drain valve for preventing the free-burst of a pipe comprises a valve body(10), a valve rod(20), a piston(30), a first compression spring(40), and a second compression spring(50). The valve body is opened on the top to which a pipe(5) is connected, a valve seat(13) is formed on the upper periphery of the valve body, and an vent(14) is formed under the valve seat. A valve disc(21) is formed on the top of the valve rod. The first compression spring is interposed between the lower interior surface of the valve body and the lower part of the valve rod. The second compression spring is interposed between the lower part of the valve rod and the bottom surface of the piston. When the internal pressure of the pipe is reduced, the valve disc is opened by the elasticity of the first compression spring and fluid in the pipe is discharged.