WO2011036956A1 - 蒸気供給システム及びそれに用いる逆止弁 - Google Patents
蒸気供給システム及びそれに用いる逆止弁 Download PDFInfo
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- WO2011036956A1 WO2011036956A1 PCT/JP2010/063383 JP2010063383W WO2011036956A1 WO 2011036956 A1 WO2011036956 A1 WO 2011036956A1 JP 2010063383 W JP2010063383 W JP 2010063383W WO 2011036956 A1 WO2011036956 A1 WO 2011036956A1
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- Prior art keywords
- valve
- steam
- flow rate
- opening
- ejector
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- 238000001704 evaporation Methods 0.000 claims abstract description 36
- 239000012530 fluid Substances 0.000 claims description 19
- 230000006837 decompression Effects 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 4
- 244000145845 chattering Species 0.000 description 18
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
- F22B37/44—Applications, arrangements, or dispositions of alarm or automatic safety devices of safety valves
- F22B37/446—Safety devices responsive to overpressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
- F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/48—Control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K2200/00—Details of valves
- F16K2200/30—Spring arrangements
- F16K2200/305—Constructional features of springs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/7904—Reciprocating valves
- Y10T137/7922—Spring biased
- Y10T137/7925—Piston-type valves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/7904—Reciprocating valves
- Y10T137/7922—Spring biased
- Y10T137/7929—Spring coaxial with valve
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/7904—Reciprocating valves
- Y10T137/7922—Spring biased
- Y10T137/7929—Spring coaxial with valve
- Y10T137/7932—Valve stem extends through fixed spring abutment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/87571—Multiple inlet with single outlet
- Y10T137/87587—Combining by aspiration
- Y10T137/87643—With condition responsive valve
Definitions
- the present invention relates to a steam supply system used for supplying steam to equipment using steam in equipment such as a steam plant, and a check valve used therefor.
- a pressure reducing valve is provided in a steam supply path for supplying steam to a steam-using device, and a steam ejector is provided downstream of the pressure reducing valve in the steam supply path.
- the suction part of the ejector and the re-evaporation tank that re-evaporates the condensate are connected by a suction path, and the re-evaporated steam in the re-evaporation tank is made by the steam ejector in the form that the steam passing through the pressure reducing valve is the driving steam of the steam ejector
- a structure is known in which a suction valve is configured to mix with the passing steam, and a check valve is provided in the suction path to prevent backflow of steam to the re-evaporation tank (for example, Patent Document 1 below) reference).
- this steam supply system uses the re-evaporated steam in the re-evaporation tank as the supply steam to the equipment that uses the steam by the suction action of the steam ejector installed in the steam supply path, thereby saving the energy of the entire equipment such as the steam plant. We are trying to make it.
- the characteristic flow rate characteristic (the characteristic flow rate characteristic shown by (a) in FIG. 2) in which the rate of increase of the flow rate with the increase in the degree is larger in the small opening range where the valve opening is smaller than in the large opening range where the valve opening is large.
- the structure had.
- the valve body 43 has a structure in which a disc-like valve lid 42 having a flat surface 42 a on the valve port 41 side is formed in the valve body 43.
- FIG. 8A shows the valve closing state
- FIG. 8B shows the valve opening state when the flow rate (specifically, Cv value described later) is about 20%.
- the check valve shown in FIG. 8 includes a valve seat abutting portion (the outer peripheral portion of the lower surface 42a of the valve lid portion 42) of the valve body 43 and an annular valve seat 48 as the valve body 43 moves due to the fluid pressure of the fluid. Since the area of the annular gap A1 formed between the two is the minimum area of the fluid inflow passage, the flow rate of the fluid is determined by the area of the annular gap A1 when the valve is opened. Since the rate of increase in the area of the gap A1 accompanying the increase in the valve opening based on the amount of movement (stroke) of the valve 43 away from the valve seat 48 gradually decreases as the valve opening increases, FIG. The characteristic flow characteristics shown in FIG.
- the re-evaporated steam with a very small flow rate is also used for the suction action of the steam ejector to further improve the energy saving effect of the entire equipment, and the type of steam-using equipment and the major equipment equipped with it.
- the supply steam etc. with respect to this steam use apparatus are controlled by adjustment of the suction pressure of a steam ejector by adjustment of the opening of a pressure reducing valve.
- the check valve interposed in the suction path has a characteristic flow rate characteristic in which the rate of increase of the flow rate with the increase of the valve opening is relatively large in a small opening region where the valve opening is small. Therefore, the minimum adjustable flow rate based on the valve opening of the check valve is not so small (in other words, the range ability is not so wide).
- the check valve is slightly opened when the suction pressure of the steam ejector is kept fairly low by adjusting the valve opening by the pressure reducing valve so as to utilize the re-evaporated steam with a very small flow rate.
- An unstable state that repeats the valve state and the valve closed state (the valve body repeatedly hits the valve seat) occurs, which causes the suction pressure of the steam ejector to become unstable and There was a problem of inaccurate steam control.
- the present invention has been made in view of the above circumstances, and its main problem is to effectively solve the above-described problems by rationally improving the check portion of the suction path.
- a first characteristic configuration of the present invention relates to a steam supply system,
- a decompression valve is installed in the steam supply path for supplying steam to the equipment that uses the steam,
- a steam ejector is installed downstream of the decompression valve in the steam supply path, and the suction part and condensate of the steam ejector are reevaporated.
- a steam supply system in which a check valve for suppressing backflow of steam to the re-evaporation tank is interposed in the suction path With the configuration of adjusting the valve opening of the pressure reducing valve according to the temperature or pressure of the steam downstream of the steam ejector in the steam supply path,
- the non-return valve has an inherent flow rate characteristic or an increase rate at which the rate of increase in flow rate associated with an increase in the valve opening is equal in a small opening region where the valve opening is small and a large opening region where the valve opening is large Is a structure having an inherent flow rate characteristic that is smaller in the small opening region than in the large opening region.
- the increase rate in the small opening range of the check valve interposed in the suction path is smaller than that in the conventional system, and accordingly, the check valve is opened accordingly.
- the minimum adjustable flow rate in the state is reduced, and the re-evaporated steam having a smaller flow rate can be allowed to pass in a stable state in which chattering described above does not occur in the check valve.
- the valve opening degree of the pressure reducing valve is adjusted according to the temperature or pressure of the steam on the downstream side of the steam ejector in the steam supply path, the temperature or pressure of the steam on the downstream side of the steam ejector is highly accurate. Therefore, it is possible to supply steam with a high energy-saving effect using re-evaporated steam even to equipment using steam that requires precisely controlled steam.
- the increase rate of the check valve in the large opening range is large, so that the large amount of re-evaporated steam can be quickly handled in the large opening region where chattering cannot occur.
- the re-evaporated vapor having a large flow rate can be passed quickly.
- the second characteristic configuration of the present invention relates to a steam supply system
- a decompression valve is installed in the steam supply path for supplying steam to the equipment that uses the steam
- a steam ejector is installed downstream of the decompression valve in the steam supply path, and the suction part and condensate of the steam ejector are reevaporated.
- a steam supply system in which a check valve for suppressing backflow of steam to the re-evaporation tank is interposed in the suction path, While having a configuration to adjust the valve opening of the pressure reducing valve according to the temperature or pressure of the passing steam of the pressure reducing valve,
- the non-return valve has an inherent flow rate characteristic or an increase rate at which the rate of increase in flow rate associated with an increase in the valve opening is equal in a small opening region where the valve opening is small and a large opening region where the valve opening is large Is a structure having an inherent flow rate characteristic that is smaller in the small opening region than in the large opening region.
- the increase rate in the small opening region of the check valve interposed in the suction path is smaller than that in the conventional system, as in the first embodiment. Accordingly, the minimum adjustable flow rate when the check valve is opened is reduced, and a smaller flow rate of re-evaporated steam can be passed in a stable state where chattering does not occur in the check valve.
- the passing steam of the pressure reducing valve (in other words, driving steam of the steam ejector)
- the temperature or pressure of the steam ejector can be controlled with high accuracy to a suitable one according to the structure and required performance of the steam ejector, so that the steam ejector can effectively achieve high efficiency and long life. Can do.
- the increase rate of the check valve in the large opening range is large, so that the large amount of re-evaporated steam can be quickly handled in the large opening region where chattering cannot occur.
- the re-evaporated vapor having a large flow rate can be passed quickly.
- the third characteristic configuration of the present invention relates to a steam supply system,
- a decompression valve is installed in the steam supply path for supplying steam to the equipment that uses the steam,
- a steam ejector is installed downstream of the decompression valve in the steam supply path, and the suction part and condensate of the steam ejector are reevaporated.
- a steam supply system in which a check valve for suppressing backflow of steam to the re-evaporation tank is interposed in the suction path, While having a configuration for adjusting the valve opening of the pressure reducing valve according to the temperature or pressure of the reevaporated vapor in the reevaporation tank,
- the non-return valve has an inherent flow rate characteristic or an increase rate at which the rate of increase in flow rate associated with an increase in the valve opening is equal in a small opening region where the valve opening is small and a large opening region where the valve opening is large Is a structure having an inherent flow rate characteristic that is smaller in the small opening region than in the large opening region.
- the increase rate in the small opening range of the check valve interposed in the suction path is smaller than in the conventional system. Therefore, the minimum adjustable flow rate in the open state of the check valve is reduced by that amount, and a smaller flow rate of re-evaporated steam can be passed in a stable state where chattering does not occur in the check valve. .
- the temperature or pressure of the reevaporated vapor in the reevaporated tank is set to a predetermined value. Therefore, for example, it is possible to effectively avoid the disadvantage that the utilization rate of the re-evaporated steam decreases due to, for example, the re-evaporated steam becoming higher than the intended temperature or pressure. .
- the increase rate of the check valve in the large opening range is large, so that the large amount of re-evaporated steam can be quickly handled in the large opening region where chattering cannot occur.
- the re-evaporated vapor having a large flow rate can be passed quickly.
- the fourth characteristic configuration of the present invention relates to a check valve, the characteristic of which is A check valve used in the steam supply system according to any one of the first to third characteristic configurations,
- a valve body is provided that is seated on the valve seat in a state of being in surface contact with the entire circumference of the annular valve seat provided at the outer peripheral edge of the valve port, and closes the valve port.
- the valve body is urged toward the valve closing side, and the valve body moves to the side away from the valve seat against the urging force of the urging means by the fluid inflow pressure from the valve port, thereby opening the valve port.
- a flow rate control protrusion that controls the flow rate of fluid in a form that keeps the area of The outer shape of the flow rate control protrusion is configured to have the inherent flow rate characteristic.
- the valve body is provided that is seated on the valve seat in a state of being in surface contact with the entire circumference of the annular valve seat provided on the outer peripheral edge portion of the valve port and closes the valve port.
- the flow rate control protrusion formed on the valve port side has the characteristic flow rate characteristic, so that the valve body contact portion of the valve body and the entire circumference of the annular valve seat are in surface contact. While obtaining a high water stop performance when the valve is closed, the above-mentioned intrinsic flow characteristics can be exhibited in a stable state with few failures and malfunctions.
- the fifth characteristic configuration of the present invention is a configuration suitable for the implementation of the fourth characteristic configuration. While providing a valve shaft for moving and guiding the valve body along a direction orthogonal to the opening surface of the valve port,
- the flow rate control protrusion is configured in a shape having symmetry or substantially symmetry around the center axis of the opening surface of the valve port.
- the valve body is moved by the inflow pressure of the fluid (from the valve closing posture to the valve opening posture) by the valve shaft that moves and guides the valve body along the direction orthogonal to the opening surface of the valve port. Can be efficiently performed.
- the said flow control projection part is comprised in the shape which has the symmetry (what is called rotational symmetry) or the general symmetry around the central-axis center of the opening surface of the said valve opening, the inflow pressure of the fluid is controlled.
- the valve body is kept in a predetermined posture using the inflow pressure of the fluid in such a manner that the inflow pressure of the fluid is uniformly received in the inflow direction of the fluid when the valve body moves along the direction orthogonal to the opening surface. Can do.
- the fluctuation of the valve body from a predetermined posture during the movement of the valve body may cause damage or wear around the support portion of the valve shaft or the interference portion with the valve shaft such as the connection portion between the valve shaft and the valve body. It can be effectively suppressed and the desired performance can be maintained for a long time.
- the sixth feature configuration of the present invention is a configuration suitable for the implementation of the fourth or fifth feature configuration,
- the flow rate control protrusion is configured to have an outer shape that does not contact the inner peripheral surface of the valve port or the valve seat in the movement process until the valve body moves toward the valve seat and sits on the valve seat. In the point.
- the block diagram which shows 1st Embodiment of a steam supply system A graph showing the relationship between valve opening and flow rate in a check valve (A) Longitudinal sectional view showing the closed state of the check valve, (b) Enlarged view of the main part (A) Longitudinal sectional view showing the open state of the check valve, (b) Enlarged view of the main part
- the block diagram which shows 2nd Embodiment of a steam supply system The block diagram which shows 3rd Embodiment of a steam supply system
- the block diagram which shows another embodiment of a steam supply system (A) Longitudinal sectional view showing the closed state of the conventional check valve, (b) Longitudinal sectional view showing the opened state of the conventional check valve
- FIG. 1 shows a schematic view of a steam supply system used in a steam use facility such as a steam plant, and supplies steam S (in this example, medium pressure or low pressure steam) to a steam use device (not shown).
- a pressure reducing valve 3 is interposed in the path 1
- a steam ejector 4 is interposed downstream of the pressure reducing valve 3 in the steam supply path 1.
- Reference numeral 2 denotes a re-evaporation tank for re-evaporating the condensate D1 (in this example, high-temperature condensate generated from steam having a pressure higher than that of the steam S), and the condensate D1 is caused to flow into the re-evaporation tank 2.
- a condensate inflow channel 5 is connected.
- a condensate discharge path 6 for discharging the condensate D2 after reevaporation is connected to the lower layer side of the reevaporation 2 tank.
- a steam trap 7 is interposed in the condensate discharge path 6.
- the upper region of the reevaporation tank 2 and the suction part 8 of the steam ejector 4 are connected by a suction path 9, and a check valve 10 that suppresses the backflow of steam to the reevaporation tank 2 is connected to the suction path 9. Is intervening.
- the re-evaporated steam FS in the re-evaporation tank 2 is sucked by the steam ejector 4 and mixed with the passed steam S in a form in which the passing steam S ′ of the pressure reducing valve 3 is the driving steam of the steam ejector 4.
- the mixed steam MA is supplied to the steam-using equipment.
- a pressure sensor 11 for detecting the pressure of the mixed steam MS is provided on the downstream side of the steam ejector 4 in the steam supply path 1, and the pressure sensor 11 and the pressure reducing valve 3 are electrically connected to each other.
- the rate of increase of the flow rate r (in this example, the flow rate coefficient (Cv value)) accompanying the increase of the valve opening degree (valve opening degree based on the movement amount of the valve body 24) d is the valve opening degree.
- the inherent flow rate characteristic (the inherent flow rate characteristic indicated by (b) in FIG. 2) or the increase rate in the small opening range where d is small and the large opening range where the valve opening is large is greater than the large opening range.
- a structure having a specific flow rate characteristic (specific flow rate characteristic indicated by (c) in FIG. 2) that is small in a small opening range is desirable, and in this example, a structure having the latter specific flow rate characteristic is used. .
- the Cv value is a numerical value representing the valve capacity, and is specifically represented by the following equation.
- Cv Q ⁇ (G / ⁇ p)
- Q Flow rate (gal (US) / min)
- G Specific gravity
- ⁇ p Differential pressure (1 lbf / in 2)
- a gas-liquid separator 12 and a steam trap 13 are integrally provided below the pressure reducing valve 3 so as to separate the condensate from the inflowing steam S to the pressure reducing valve 3, and the gas-liquid separator 12 and the steam trap are provided.
- a communication pipe 14 is provided for guiding the condensate D3 separated through 13 to the upper area of the reevaporation tank 2. By these things, it is set as the structure which supplies passing steam S 'with a very low condensate mixing rate to the nozzle part (not shown) incorporated in the suction part 4a of the steam ejector 4.
- FIG. Reference numeral 15 denotes a check valve 15 interposed in the communication pipe 14.
- the check valve 10 interposed in the suction passage 9 includes an outlet side valve case 18 having a valve chamber 16 and an outflow passage 17 therein, an inflow passage 19 and an annular passage.
- a substantially cylindrical inlet side valve case 21 having a valve seat 23 is integrally assembled in an airtight state.
- valve chamber 16 is seated on the valve seat 23 in a state of being in surface contact with the entire circumference of the valve seat 23 formed on the outer peripheral edge of the valve port 22 that opens the inflow passage 19 to the valve chamber 16.
- the valve body 24 which can be closed is housed.
- a compression coil spring 25 (an example of a biasing means) that biases the valve body 24 toward the valve closing side is provided between the valve body 24 and the outlet side valve case 18 in the valve chamber 16.
- valve chamber 16 is provided with a valve shaft 26 for moving and guiding the valve body 24 along the X direction orthogonal to the opening surface of the valve port 22.
- the valve shaft 26 is a pair of rods that protrude from both end sides of the valve body 24 so as to be in a straight line along the passage direction (the X direction in the present example) of the fluid (revaporized vapor FS in the present example). It consists of parts.
- One end side bearing that supports one end side (the upper end side in the figure) of the valve shaft 26 movably along the X direction orthogonal to the opening surface of the valve port 22 is provided at a portion of the valve chamber 16 on the outflow passage 17 side. 27 is provided. Inside the inflow path 19, there is provided the other end side bearing 28 that supports the other end side of the valve shaft 26 slidably along the X direction.
- the check valve 10 is basically in a closed state (the state shown in FIG. 3) in which the valve port 22 is closed by the urging force of the compression coil spring 25 and receives a predetermined fluid inflow pressure.
- the valve port 22 is opened only when the valve body 24 moves away from the valve seat 23 (upper side in FIG. 3) against the urging force of the compression coil spring 25 by the fluid inflow pressure.
- the valve is open (state shown in FIG. 4).
- the valve open state shown in FIG. 4 is a state where the Cv value is about 20%.
- the valve body 24 includes a valve lid portion 29 that protrudes in a bowl shape along the radial direction of the valve shaft 26, and a valve seat contact portion of the valve body 24 when the valve body 24 moves away from the valve seat 23. (Specifically, it is formed between the inner surface of the valve opening 22 rather than the area of the annular gap (opening surface) A1 formed between the valve seat 23 and the outer periphery of the lower surface of the valve lid portion 29).
- a flow rate control protrusion 30 that protrudes to the center position of the surface on the valve port 22 side of the valve lid portion 29 so as to control the flow rate of the re-evaporated vapor FS in a form that reduces the area of the gap (opening surface) A2.
- the valve shaft 26 is integrally formed.
- the shape (specifically, the outer shape) of the flow rate control protrusion 30 is such that the rate of increase of the flow rate r accompanying the increase of the valve opening d is smaller in the small opening region than in the large opening region. It is configured to have a characteristic (characteristic flow characteristic shown by (c) in FIG. 2). Specifically, the shape of the protrusion 30 for flow control is such that the rate of increase in the area of the gap A2 in the valve lid side half 30a (upper half in the figure) with respect to the upward movement amount of the valve body 24 is the valve opening.
- the outer diameter R1 (that is, the maximum diameter of the flow control protrusion 30) of the flow control protrusion 30 on the side of the valve lid 29 is configured to be the same as the inner diameter R2 of the inflow passage 19, and By chamfering the inner edge and making the inner diameter R3 of the valve port 22 slightly larger than the outer diameter R1 of the valve lid 29 side end of the flow rate control projection 30, the valve element 24 approaches the valve seat 23. In the moving process until the valve lid 29 is seated on the valve seat 23, the flow rate control projection 30 is located on either the inner peripheral surface of the valve port 22 or the inner peripheral surface of the valve seat 23 and the inflow passage 19. Is configured so as not to contact.
- a pressure sensor 32 for detecting the pressure of the reevaporated vapor FS in the reevaporation tank 2 is provided in the reevaporation tank 2, and the pressure sensor 32 and the pressure reducing valve 3 are provided. Electrically connected, the valve opening degree of the pressure reducing valve 3 is adjusted so that the pressure of the re-evaporated steam FS in the re-evaporation tank 2 becomes a predetermined value according to the detection value of the pressure sensor 32.
- valve opening degree of the pressure reducing valve 3 is adjusted according to the pressure of the steam on the downstream side of the steam ejector 4 in the steam supply path 1 is shown as an example.
- the opening degree of the pressure reducing valve 3 may be adjusted according to the pressure of the passing steam S ′.
- a pressure sensor 33 that detects the pressure of the steam S ′ passing through the pressure reducing valve 3 is provided at a location between the pressure reducing valve 3 and the steam ejector 2 in the steam supply path 1.
- the pressure sensor 33 and the pressure reducing valve 3 are electrically connected, and the pressure reducing valve 3 is opened so that the pressure of the re-evaporated vapor FS in the re-evaporating tank 2 becomes a predetermined value according to the detection value of the pressure sensor 33. It is configured to adjust the degree.
- valve opening degree of the pressure reducing valve 3 is adjusted according to the detection values of the pressure sensors 11, 32, and 33 is shown as an example.
- the valve opening degree of the pressure reducing valve 3 may be mechanically adjusted according to the pilot pressure through 34.
- valve opening degree of the pressure reducing valve 3 is adjusted according to the detection values of the pressure sensors 11, 32, and 33
- the saturated steam pressure and temperature have a fixed relationship.
- a temperature sensor may be provided instead of the pressure sensor, and the valve opening degree of the pressure reducing valve 3 may be adjusted in accordance with the detected value of the temperature sensor.
- the check valve 10 has an inherent flow rate characteristic in which the rate of increase of the flow rate r accompanying the increase in the valve opening d is smaller in the small opening region than in the large opening region (FIG. 2).
- the structure having the characteristic flow characteristic shown in (c) of FIG. 5 is shown as an example.
- the increase rate of the flow rate r accompanying the increase in the valve opening d is small in the check valve 10 due to the increase in the valve opening d.
- a structure having a specific flow rate characteristic (a specific flow rate characteristic shown in FIG. 2B) equivalent to a small opening range and a large opening range having a large valve opening d may be used.
- the specific configuration such as the shape of the flow rate control protrusion 30 is not limited to the above-described hemispherical or substantially hemispherical shape, but has a desired intrinsic flow characteristic such as a conical shape, a truncated cone shape, a truncated pyramid shape, or a truncated pyramid shape. It may be changed as appropriate.
- the urging means of the check valve 10 is constituted by the compression coil spring 25 is shown as an example.
- the urging means is constituted by an elastic body such as rubber or a valve structure using gravity as the urging force. May be.
- the flow rate control protrusion 30 moves to the inner periphery of the valve port 22 during the movement process until the valve body 24 moves toward the valve seat 23 and the valve lid portion 29 is seated on the valve seat 23.
- the outer diameter R1 of the end of the flow rate control projection 30 on the side of the valve lid portion 29 is set to the inner diameter R2 of the inflow passage 19 so as not to contact any of the surface and the inner peripheral surface of the valve seat 23 and the inflow passage 19.
- the inner edge portion of the valve port 22 is chamfered so that the inner diameter R3 of the valve port 22 is slightly larger than the outer diameter R1 of the end of the flow control protrusion 30 on the valve lid portion 29 side.
- the outer diameter R1 of the end of the flow rate control protrusion 30 on the valve lid 29 side may be smaller than the inner diameter R2 of the inflow passage 19 and the inner diameter R3 of the valve port 22.
- the present invention can be suitably used for various facilities equipped with steam-using equipment.
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Abstract
Description
蒸気使用機器に蒸気を供給する蒸気供給路に減圧弁を介装し、前記蒸気供給路における減圧弁の下流側に蒸気エゼクタを介装するとともに、前記蒸気エゼクタの吸引部と復水を再蒸発させる再蒸発タンクとを吸引路で接続し、
前記減圧弁の通過蒸気を蒸気エゼクタの駆動蒸気とする形態で再蒸発タンク内の再蒸発蒸気を蒸気エゼクタで吸引して前記通過蒸気と混合する構成にするとともに、
前記再蒸発タンクへの蒸気の逆流を抑止する逆止弁を前記吸引路に介装してある蒸気供給システムであって、
前記蒸気供給路における前記蒸気エゼクタの下流側の蒸気の温度又は圧力に応じて前記減圧弁の弁開度を調整する構成にするとともに、
前記逆止弁を、それの弁開度の増大に伴う流量の増大率が弁開度の小さな小開度域と弁開度の大きな大開度域とで同等となる固有流量特性又は前記増大率が前記大開度域よりも前記小開度域で小さくなる固有流量特性を有する構造にした点にある。
蒸気使用機器に蒸気を供給する蒸気供給路に減圧弁を介装し、前記蒸気供給路における減圧弁の下流側に蒸気エゼクタを介装するとともに、前記蒸気エゼクタの吸引部と復水を再蒸発させる再蒸発タンクとを吸引路で接続し、
前記減圧弁の通過蒸気を蒸気エゼクタの駆動蒸気とする形態で再蒸発タンク内の再蒸発蒸気を蒸気エゼクタで吸引して前記通過蒸気と混合する構成にするとともに、
前記再蒸発タンクへの蒸気の逆流を抑止する逆止弁を前記吸引路に介装してある蒸気供給システムであって、
前記減圧弁の通過蒸気の温度又は圧力に応じて前記減圧弁の弁開度を調整する構成にするとともに、
前記逆止弁を、それの弁開度の増大に伴う流量の増大率が弁開度の小さな小開度域と弁開度の大きな大開度域とで同等となる固有流量特性又は前記増大率が前記大開度域よりも前記小開度域で小さくなる固有流量特性を有する構造にした点にある。
蒸気使用機器に蒸気を供給する蒸気供給路に減圧弁を介装し、前記蒸気供給路における減圧弁の下流側に蒸気エゼクタを介装するとともに、前記蒸気エゼクタの吸引部と復水を再蒸発させる再蒸発タンクとを吸引路で接続し、
前記減圧弁の通過蒸気を蒸気エゼクタの駆動蒸気とする形態で再蒸発タンク内の再蒸発蒸気を蒸気エゼクタで吸引して前記通過蒸気と混合する構成にするとともに、
前記再蒸発タンクへの蒸気の逆流を抑止する逆止弁を前記吸引路に介装してある蒸気供給システムであって、
前記再蒸発タンク内の再蒸発蒸気の温度又は圧力に応じて前記減圧弁の弁開度を調整する構成にするとともに、
前記逆止弁を、それの弁開度の増大に伴う流量の増大率が弁開度の小さな小開度域と弁開度の大きな大開度域とで同等となる固有流量特性又は前記増大率が前記大開度域よりも前記小開度域で小さくなる固有流量特性を有する構造にした点にある。
前記第1~第3特徴構成のいずれかに記載の蒸気供給システムに用いる逆止弁であって、
弁口の外周縁部に設けた環状の弁座の全周に面当接する状態で弁座に着座して弁口を閉弁する弁体を設け、付勢手段の付勢力によって前記弁体を閉弁側に付勢し、且つ、前記弁口からの流体流入圧によって前記付勢手段の付勢力に抗して弁体が弁座から離れる側に移動して弁口を開弁する構造にするとともに、
前記弁体が前記弁座から離れる側に移動するときに弁体の弁座当接部と弁座との間に形成される隙間の面積よりも弁口の内面との間に形成される隙間の面積を小さく保つ形態で流体の通過流量を制御する流量制御用の突出部を弁体の弁口側に設け、
前記固有流量特性を有するように前記流量制御用突出部の外郭形状を構成した点にある。
前記弁体を前記弁口の開口面に直交する方向に沿って移動案内する弁軸を設けるとともに、
前記流量制御用突出部を、前記弁口の開口面の中心軸芯周りで対称性又は略対称性を有する形状に構成した点にある。
前記流量制御用突出部を、前記弁体が前記弁座に近づく側に移動して弁座に着座するまでの移動過程において前記弁口の内周面又は弁座に接触しない外郭形状に構成した点にある。
図1は、蒸気プラント等の蒸気使用設備に用いられる蒸気供給システムの概略図を示し、蒸気使用機器(図示しない)に蒸気S(本例では、中圧又は低圧の蒸気)を供給する蒸気供給路1に減圧弁3を介装するとともに、蒸気供給路1における減圧弁3の下流側に蒸気エゼクタ4を介装してある。
Cv=Q√(G/Δp)
Q:流量(gal(US)/min)
G:比重
Δp:差圧(1lbf/in2)
前述の第1実施形態では、前記蒸気供給路1における前記蒸気エゼクタ4の下流側の蒸気の圧力に応じて前記減圧弁3の弁開度を調整する構成を例に示したが、前記再蒸発タンク2内の再蒸発蒸気FSの圧力に応じて前記減圧弁3の弁開度を調整する構成にしてもよい。
前述の第1実施形態では、前記蒸気供給路1における前記蒸気エゼクタ4の下流側の蒸気の圧力に応じて前記減圧弁3の弁開度を調整する構成を例に示したが、前記減圧弁の通過蒸気S´の圧力に応じて前記減圧弁3の弁開度を調整する構成にしてもよい。
前述の各実施形態では、圧力センサ11、32、33の検出値に応じて前記減圧弁3の弁開度を調整する構成を例に示したが、例えば、図7に示すように、パイロット管34を通じてのパイロット圧に応じて前記減圧弁3の弁開度を機械的に調整する構成にしてもよい。
2 再蒸発タンク
3 減圧弁
4 蒸気エゼクタ
4a 吸引部
9 吸引路
10 逆止弁
22 弁口
23 弁座
24 弁体
25 付勢手段
26 弁軸
30 流量制御用突出部
S 蒸気
S´ 減圧弁の通過蒸気
FS 再蒸発蒸気
MS 混合蒸気
d 弁開度
r 流量
A1 隙間
A2 隙間
Claims (6)
- 蒸気使用機器に蒸気を供給する蒸気供給路に減圧弁を介装し、前記蒸気供給路における減圧弁の下流側に蒸気エゼクタを介装するとともに、前記蒸気エゼクタの吸引部と復水を再蒸発させる再蒸発タンクとを吸引路で接続し、
前記減圧弁の通過蒸気を蒸気エゼクタの駆動蒸気とする形態で再蒸発タンク内の再蒸発蒸気を蒸気エゼクタで吸引して前記通過蒸気と混合する構成にするとともに、
前記再蒸発タンクへの蒸気の逆流を抑止する逆止弁を前記吸引路に介装してある蒸気供給システムであって、
前記蒸気供給路における前記蒸気エゼクタの下流側の蒸気の温度又は圧力に応じて前記減圧弁の弁開度を調整する構成にするとともに、
前記逆止弁を、それの弁開度の増大に伴う流量の増大率が弁開度の小さな小開度域と弁開度の大きな大開度域とで同等となる固有流量特性又は前記増大率が前記大開度域よりも前記小開度域で小さくなる固有流量特性を有する構造にしてある蒸気供給システム。 - 蒸気使用機器に蒸気を供給する蒸気供給路に減圧弁を介装し、前記蒸気供給路における減圧弁の下流側に蒸気エゼクタを介装するとともに、前記蒸気エゼクタの吸引部と復水を再蒸発させる再蒸発タンクとを吸引路で接続し、
前記減圧弁の通過蒸気を蒸気エゼクタの駆動蒸気とする形態で再蒸発タンク内の再蒸発蒸気を蒸気エゼクタで吸引して前記通過蒸気と混合する構成にするとともに、
前記再蒸発タンクへの蒸気の逆流を抑止する逆止弁を前記吸引路に介装してある蒸気供給システムであって、
前記減圧弁の通過蒸気の温度又は圧力に応じて前記減圧弁の弁開度を調整する構成にするとともに、
前記逆止弁を、それの弁開度の増大に伴う流量の増大率が弁開度の小さな小開度域と弁開度の大きな大開度域とで同等となる固有流量特性又は前記増大率が前記大開度域よりも前記小開度域で小さくなる固有流量特性を有する構造にしてある蒸気供給システム。 - 蒸気使用機器に蒸気を供給する蒸気供給路に減圧弁を介装し、前記蒸気供給路における減圧弁の下流側に蒸気エゼクタを介装するとともに、前記蒸気エゼクタの吸引部と復水を再蒸発させる再蒸発タンクとを吸引路で接続し、
前記減圧弁の通過蒸気を蒸気エゼクタの駆動蒸気とする形態で再蒸発タンク内の再蒸発蒸気を蒸気エゼクタで吸引して前記通過蒸気と混合する構成にするとともに、
前記再蒸発タンクへの蒸気の逆流を抑止する逆止弁を前記吸引路に介装してある蒸気供給システムであって、
前記再蒸発タンク内の再蒸発蒸気の温度又は圧力に応じて前記減圧弁の弁開度を調整する構成にするとともに、
前記逆止弁を、それの弁開度の増大に伴う流量の増大率が弁開度の小さな小開度域と弁開度の大きな大開度域とで同等となる固有流量特性又は前記増大率が前記大開度域よりも前記小開度域で小さくなる固有流量特性を有する構造にしてある蒸気供給システム。 - 請求項1~3のいずれか1項に記載の蒸気供給システムに用いる逆止弁であって、
弁口の外周縁部に設けた環状の弁座の全周に面当接する状態で弁座に着座して弁口を閉弁する弁体を設け、付勢手段の付勢力によって前記弁体を閉弁側に付勢し、且つ、前記弁口からの流体流入圧によって前記付勢手段の付勢力に抗して弁体が弁座から離れる側に移動して弁口を開弁する構造にするとともに、
前記弁体が前記弁座から離れる側に移動するときに弁体の弁座当接部と弁座との間に形成される隙間の面積よりも弁口の内面との間に形成される隙間の面積を小さく保つ形態で流体の通過流量を制御する流量制御用の突出部を弁体の弁口側に設け、
前記固有流量特性を有するように前記流量制御用突出部の外郭形状を構成してある逆止弁。 - 前記弁体を前記弁口の開口面に直交する方向に沿って移動案内する弁軸を設けるとともに、
前記流量制御用突出部を、前記弁口の開口面の中心軸芯周りで対称性又は略対称性を有する形状に構成してある請求項4記載の逆止弁。 - 前記流量制御用突出部を、前記弁体が前記弁座に近づく側に移動して弁座に着座するまでの移動過程において前記弁口の内周面又は弁座に接触しない外郭形状に構成してある請求項4又は5記載の逆止弁。
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AU2010299261A AU2010299261B2 (en) | 2009-09-28 | 2010-08-06 | Steam supply system and check valve for use therein |
US13/497,437 US8881761B2 (en) | 2009-09-28 | 2010-08-06 | Steam supply system and check valve for use therein |
KR1020127006777A KR101780679B1 (ko) | 2009-09-28 | 2010-08-06 | 증기 공급 시스템 및 거기에 사용하는 체크 밸브 |
CN201080044694.9A CN102725537B (zh) | 2009-09-28 | 2010-08-06 | 蒸气供给系统和用于蒸气供给系统的止回阀 |
SG2012014171A SG178917A1 (en) | 2009-09-28 | 2010-08-06 | Steam supply system and check valve for use therein |
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JP2009174719A (ja) * | 2001-02-26 | 2009-08-06 | Kitz Corp | バタフライバルブ |
WO2007046379A1 (ja) * | 2005-10-18 | 2007-04-26 | Yamatake Corporation | ケージ弁 |
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JP2007333302A (ja) * | 2006-06-15 | 2007-12-27 | Tlv Co Ltd | 蒸気エゼクタ装置 |
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Non-Patent Citations (1)
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Also Published As
Publication number | Publication date |
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CN102725537A (zh) | 2012-10-10 |
JP4665045B1 (ja) | 2011-04-06 |
EP2484918A4 (en) | 2016-04-13 |
KR101780679B1 (ko) | 2017-09-21 |
EP2484918B1 (en) | 2020-01-22 |
SG178917A1 (en) | 2012-04-27 |
AU2010299261B2 (en) | 2015-07-16 |
EP2484918A1 (en) | 2012-08-08 |
US8881761B2 (en) | 2014-11-11 |
KR20120079832A (ko) | 2012-07-13 |
AU2010299261A1 (en) | 2012-03-15 |
CN102725537B (zh) | 2015-04-15 |
US20120234420A1 (en) | 2012-09-20 |
JP2011069335A (ja) | 2011-04-07 |
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