Stress Regulator

Abstract

To provide a pressure governing device capable of adjusting pressure governing characteristic by applying force in an opening direction or a closing direction to a valve element while keeping a comparatively simple constitution.SOLUTION: A pressure governing device for controlling a secondary pressure by adjusting an opening of a valve element V1 between a closing state in which the valve element V1 is seated on a valve seat V2 formed around an opening hole K1 and an opening state in which the valve element V1 is separated from the valve seat V2, in a state that a bottom portion V1b on a side opposite to a top portion V1a side of the valve element V1 to which a valve shaft 16 is connected, is directed to a secondary side of piping in which a fluid is circulated, includes a top space pressure adjustment mechanism SY attachable and detachable to and from the bottom portion V1b of the main valve element V1 and having a communication passage KM1 for connecting a top space SP1 surrounded by a wall portion including the top portion V1a of the main valve element V1 and a secondary side of the main valve element V1 at a top portion V1a side of the main valve element V1.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a pressure regulating device that adjusts the opening degree of a valve body between a closed state in which the valve seat of the valve body seats against a valve seat formed around an opening and an open state in which the valve body separates from the valve seat, with the bottom of the valve body on the side opposite to the top side of the valve body to which the valve shaft is connected being directed toward the secondary side of a pipe through which fluid flows, thereby controlling the secondary pressure of the valve body.

Background Art

[0002] Conventionally, as shown in Patent Document 1, as a pressure regulating device, there is known one provided with a balance diaphragm connected to a valve shaft, a secondary side balance chamber in which the balance diaphragm bears a part of the outer peripheral surface, a communication pipe connecting the secondary side balance chamber and the secondary side of the valve body, and an opening degree adjusting valve provided in the communication pipe and having an adjustable opening degree (see Patent Document 1). In the pressure regulating device disclosed in Patent Document 1, the pressure regulating characteristics are adjusted by transmitting the secondary pressure to the secondary side balance chamber through the communication pipe and applying a force acting on the valve body in the opening or closing direction.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology disclosed in Patent Document 1 described above, as described above, the pressure regulating characteristics are adjusted by transmitting the secondary pressure to the secondary side balance chamber through the communication pipe and applying a force acting on the valve body in the opening or closing direction. However, as a configuration for realizing such adjustment, it is necessary to provide a balance diaphragm, a communication pipe disposed outside the pressure regulating device, an opening degree adjusting valve for adjusting the opening degree of the communication pipe, etc., and there is a problem that the configuration becomes complicated.

[0005] The present invention has been made in view of the above-mentioned problems, and its objective is to provide a pressure regulating device that can adjust the pressure regulating characteristics by applying force to the valve body in the opening or closing direction, while maintaining a relatively simple configuration. [Means for solving the problem]

[0006] A pressure regulating device for achieving the above objective controls the secondary pressure of the valve body by adjusting the opening degree of the valve body between a closed state in which the valve body is seated against a valve seat formed around an opening and an open state in which the valve body is separated from the valve seat, with the bottom side opposite to the top side of the valve body to which the valve stem is connected facing the secondary side of the piping through which the fluid flows, and its characteristic configuration is as follows: The valve body is equipped with a top space pressure adjustment mechanism that is detachably attached to the bottom of the valve body and has a connecting passage on the top side of the valve body that connects the top space, which is surrounded by the wall portion including the top of the valve body, with the secondary side of the valve body. 、 The aforementioned ceiling space pressure adjustment mechanism includes a flow straightening section that straightens the flow of fluid passing from the primary side to the secondary side of the valve body, The flow straightening section has a secondary opening, which is the secondary opening of the communication passage, at the tip side opposite to the valve body, through which the fluid straightened by the flow straightening section flows. The rectifier portion has a frustum shape in which, when the valve body is mounted on the bottom, the diameter gradually decreases from the top towards the bottom in the opening and closing direction of the valve body along the valve shaft, The secondary opening is provided on the tip side of the frustoconical flow straightening portion, The flow straightening portion is provided at a position corresponding to the opening in the opening / closing direction when the valve body is mounted on the bottom, The aforementioned ceiling space pressure adjustment mechanism has a relative position adjustment unit that can adjust the relative position between the valve body and the flow straightening unit in the opening and closing direction when the flow straightening unit is attached to the bottom of the valve body, The advantage of this design is that by operating the relative position adjustment unit, the diameter of the flow straightening unit located at the opening position in the opening and closing direction can be freely adjusted. The pressure regulating device for achieving the above objective is: A pressure regulating device controls the secondary pressure of a valve body by adjusting the opening degree of the valve body between a closed state in which the valve body is seated against a valve seat formed around an opening and an open state in which the valve body is separated from the valve seat, with the bottom side opposite to the top side of the valve body to which the valve stem is connected facing the secondary side of the piping through which the fluid flows, and its characteristic configuration is as follows: The valve body is equipped with a top space pressure adjustment mechanism that is detachably attached to the bottom of the valve body and has a communication passage on the top side of the valve body that connects the top space, which is surrounded by the wall portion including the top of the valve body, with the secondary side of the valve body. The aforementioned ceiling space pressure adjustment mechanism includes a flow straightening section that straightens the flow of fluid passing from the primary side to the secondary side of the valve body, The flow straightening section has a secondary opening, which is the secondary opening of the communication passage, at the tip side opposite to the valve body, through which the fluid straightened by the flow straightening section flows. The rectifier portion has a frustum shape in which, when the valve body is mounted on the bottom, the diameter gradually decreases from the top towards the bottom in the opening and closing direction of the valve body along the valve shaft, The secondary opening is provided on the tip side of the frustoconical flow straightening portion, The rectifying section is provided with fins that, when the valve body is mounted on the bottom, are provided along the direction from the top to the bottom. The pressure regulating device for achieving the above objective is: A pressure regulating device controls the secondary pressure of a valve body by adjusting the opening degree of the valve body between a closed state in which the valve body is seated against a valve seat formed around an opening and an open state in which the valve body is separated from the valve seat, with the bottom side opposite to the top side of the valve body to which the valve stem is connected facing the secondary side of the piping through which the fluid flows, and its characteristic configuration is as follows: The valve body is equipped with a top space pressure adjustment mechanism that is detachably attached to the bottom of the valve body and has a communication passage on the top side of the valve body that connects the top space, which is surrounded by the wall portion including the top of the valve body, with the secondary side of the valve body. The communication passage formed in the aforementioned ceiling space pressure adjustment mechanism is located in a point where it connects the ceiling space and the secondary side via a valve body communication passage provided in the valve body.

[0007] According to the above characteristic configuration, the valve body is equipped with a top space pressure adjustment mechanism that is detachable from the bottom of the valve body and has a communication passage connecting the top space, which is surrounded by the wall portion including the top of the valve body, with the secondary side of the valve body. Therefore, with a relatively simple configuration of providing a top space pressure adjustment mechanism that can be attached to the valve body, secondary pressure can be transmitted to the top space of the valve body via the communication passage, thereby applying a force to the valve body in the opening or closing direction. Based on the above, it is possible to realize a pressure regulating device that can adjust the pressure regulating characteristics by applying force to the valve body in the opening or closing direction, while maintaining a relatively simple configuration.

[0008] Further characteristic features of the pressure regulating device are: The aforementioned ceiling space pressure adjustment mechanism includes a flow straightening section that straightens the flow of fluid passing from the primary side to the secondary side of the valve body, The flow straightening section is characterized by having a secondary opening, which is the secondary opening of the communication passage, at the tip end opposite to the valve body through which the fluid straightened in the flow straightening section passes.

[0009] Normally, near a valve, the valve obstructs at least a portion of the fluid flow in order to reduce the primary pressure to the desired set secondary pressure, which can cause turbulence in the fluid flow and destabilize the pressure near the valve. According to the above-described configuration, the flow straightening section, which acts as a pressure adjustment mechanism for the upper space, straightens the flow of fluid passing from the primary side to the secondary side of the valve body. As a result, turbulence in the fluid near the valve body is less likely to occur, and the stable flow allows the secondary pressure to be stabilized as well. Furthermore, since the secondary opening, which serves as the secondary opening of the communication passage, is formed on the tip side opposite the valve body and is the part through which the fluid straightened in the straightening section passes, a stable pressure can be transmitted from the relatively stable flow area to the upper space, thereby stabilizing the force acting on the valve body via the pressure in the upper space. In particular, by improving the fluid velocity through fluid straightening by the straightening section, the pressure at the secondary opening can be reduced by the Venturi effect, thereby lowering the pressure in the upper space, and thus a boost effect can be exerted to lift the valve body at high flow rates. Furthermore, the pressing device can have various arrangements, including an arrangement in which the top portion is located downward and the bottom portion is located upward.

[0010] A further characteristic configuration of the pressing device is that the rectifying portion has a frustum shape in which the diameter gradually decreases toward the tip side from the top portion in the opening / closing direction of the valve body along the valve shaft in the state where the valve body is attached to the bottom portion of the valve body, and the secondary side opening portion is provided on the tip side of the rectifying portion having the frustum shape.

[0011] As a result of intensive research, the inventors have newly found that by forming the rectifying portion into a frustum shape in which the diameter gradually decreases toward the tip side from the top portion in the opening / closing direction of the valve body along the valve shaft, it is possible to stabilize the flow of fluid from the primary side to the secondary side of the valve body, which may have caused turbulence in the form of a collision on the bottom side of the valve body in the conventional art, on the downstream side of the rectifying portion. Furthermore, the inventors have newly found that by providing the secondary side opening portion on the tip side of the rectifying portion having the frustum shape, it is possible to guide the stable pressure due to the stable flow to the top portion space and make the force in the opening or closing direction acting on the valve body stable.

[0012] A further characteristic configuration of the pressing device is that the rectifying portion is provided at a position corresponding to the opening in the opening / closing direction in the state where the valve body is attached to the bottom portion of the valve body, the top portion space pressure adjustment mechanism has a relative position adjustment portion capable of adjusting the relative position between the valve body and the rectifying portion in the opening / closing direction in the state where the rectifying portion is attached to the bottom portion of the valve body, and by operating the relative position adjustment portion, the diameter of the rectifying portion located at the opening position in the opening / closing direction can be freely adjusted when the valve body is located at a predetermined position in the opening / closing direction.

[0013] According to the above characteristic configuration, by operating the relative position adjustment unit, the diameter of the flow straightening unit located at the opening position in the opening and closing direction can be adjusted. This allows the pressure transmitted to the upper space to be adjusted by adjusting the flow velocity near the secondary opening, thereby adjusting the force acting on the valve body in the opening or closing direction to a desired value.

[0014] Further characteristic features of the pressure regulating device are: The rectifying section is provided with fins that, when the valve body is mounted on the bottom, are provided along the direction from the top to the bottom.

[0015] As described above, by providing fins in the flow straightening section that run from the top to the bottom, the flow straightening effect of the fluid passing near the secondary opening can be enhanced, and the pressure transmitted to the top space can be further stabilized. Furthermore, the fins themselves act as a barrier, suppressing collisions between jets and thus reducing noise.

[0016] Further characteristic features of the pressure regulating device are: The fins are arranged in a spiral pattern around the axis of the frustoconical flow straightening section.

[0017] As described above, by arranging the fins spirally around the axis of the frustoconical flow straightening section, the flow straightening effect at the bottom of the valve body can be further improved, and the pressure transmitted to the upper space can be further stabilized.

[0018] Further characteristic features of the pressure regulating device are: The ceiling space pressure adjustment mechanism is characterized by having the opening direction of the secondary side opening, which is the secondary side opening of the communication passage, directed toward the primary side of the piping.

[0019] As described above, if the boost effect at high flow rates is made too large, it may lead to instability in pressure regulation performance. Therefore, as described in the above characteristic configuration, by orienting the opening direction of the secondary side opening, which is the secondary side opening of the communication passage, toward the primary side of the piping, when the flow rate is large, the fluid from the primary side flows into the top space, increasing the pressure in the top space and thus increasing the force acting on the valve body in the closing direction.

[0020] Further characteristic features of the pressure regulating device are: The communication passage formed in the aforementioned ceiling space pressure adjustment mechanism is located in a point where it connects the ceiling space and the secondary side via a valve body communication passage provided in the valve body.

[0021] According to the above-described configuration, the communication passage formed in the ceiling space pressure adjustment mechanism connects the ceiling space and the secondary side via a valve body communication passage provided in the valve body. Therefore, unlike in the conventional technology, there is no need to provide external components such as communication piping to the pressure adjustment device, thus simplifying the configuration. [Brief explanation of the drawing]

[0022] [Figure 1] This is a schematic diagram of the pressure regulating device according to the embodiment. [Figure 2] This is a schematic diagram of the ceiling space pressure adjustment mechanism according to the first embodiment. [Figure 3] This is a schematic diagram of the ceiling space pressure adjustment mechanism according to the second embodiment, where (a) is a view from the front side of the rectifying section and (b) is a perspective view. [Figure 4] This graph shows the changes in the upper and lower valve pressures of the main valve body for each flow rate when using the upper space pressure adjustment mechanism according to the embodiment. [Figure 5] This is a schematic diagram of a ceiling space pressure adjustment mechanism according to another embodiment, where (a) is a view from the front side of the rectifying section and (b) is a side view. [Figure 6] This is a schematic diagram of a ceiling space pressure adjustment mechanism according to another embodiment. [Modes for carrying out the invention]

[0023] The pressure regulating device according to this embodiment is capable of adjusting the pressure regulating characteristics by applying force to the valve body in the opening or closing direction, while maintaining a relatively simple configuration. The pressure regulating device will be described below with reference to the drawings.

[0024] [First Embodiment] As shown in Figures 1 and 2, the pressure regulating device according to the first embodiment is provided for supplying a fluid (for example, city gas 13A) at a predetermined set pressure, and comprises a main governor 10 that adjusts the secondary pressure P2 of the fluid flow path L0 (an example of a flow path formed inside a pipe) to the set pressure, and a pilot governor 50 that introduces drive pressure to the main governor 10. The main governor 10 includes a first diaphragm D1 provided along the diaphragm plate 14, and its internal space is divided into a first chamber H1 and a drive pressure chamber H2 by the first diaphragm D1. The main governor 10 also includes a main valve body V1 (an example of a valve body) that opens and closes a main opening K1 (an example of an opening) provided in the fluid flow path L0. This main valve body V1 is connected to the first diaphragm D1 by a valve stem 16 and is configured to open and close in conjunction with the first diaphragm D1. In other words, in the pressure regulating device according to the first embodiment, the lower part V1b of the valve body V1 opposite to the upper part V1a side of the valve body V1 to which the valve stem 16 is connected is directed toward the secondary side of the fluid passage L0 (an example of piping) through which the fluid flows. The secondary pressure is controlled by adjusting the opening degree of the main valve body V1 between a closed state in which the main valve body V1 is seated against the valve seat V2 formed around the main opening K1 and an open state in which the main valve body V1 is separated from the valve seat V2. Furthermore, the first chamber H1 is equipped with a first spring G1 that biases the first diaphragm D1 toward the opening direction of the main valve body V1.

[0025] The pilot governor 50 is equipped with a sub-diaphragm D0 provided along the diaphragm plate 34, and its internal space is divided into a fifth chamber H5 and a sixth chamber H6 by the sub-diaphragm D0. The sixth chamber H6 of the pilot governor 50 is connected to a secondary pressure introduction passage L2 which is connected to the secondary side of the fluid flow path L0 (downstream side of the main governor 10), and is equipped with a sub-valve body V0 that opens and closes a sub-opening K0 provided between a primary pressure introduction passage L4 which is connected to the primary side of the fluid flow path L0 (upstream side of the main governor 10) and a drive pressure introduction passage L3 which is connected to the drive pressure chamber H2 of the main governor 10. This sub-valve body V0 is connected to the sub-diaphragm D0 by a connecting rod 36 and is configured to open and close in conjunction with the sub-diaphragm D0. In addition, a second spring G2 is provided in the fifth chamber H5 which biases the sub-diaphragm D0 toward the opening direction of the sub-valve body V0. Furthermore, a connecting passage L5 is provided to connect the secondary pressure introduction passage L2 and the drive pressure introduction passage L3, and a throttling section S1 is provided in the connecting passage L5 to narrow the diameter of the passage.

[0026] By adopting this configuration, when the secondary pressure P2 of the fluid passage L0 falls below the set pressure, the pressure in the sixth chamber H6 of the pilot governor 50, which is in communication with the secondary pressure introduction passage L2, decreases, and the biasing force of the second spring G2 displaces the sub-diaphragm D0 toward the sixth chamber H6. As a result, the sub-valve body V0 of the pilot governor 50 moves to the open side, and primary pressure is introduced into the drive pressure chamber H2 of the main governor 10. As a result, the pressure in the drive pressure chamber H2 increases, and the first diaphragm D1 is biased toward the first chamber H1 by the pressure in the drive pressure chamber H2 against the biasing force of the first spring G1, causing the first diaphragm D1 to displace toward the first chamber H1, and the main valve body V1 of the main governor 10 moves to the open side, increasing the secondary pressure P2 of the fluid passage L0 and adjusting the secondary pressure P2 to the set pressure. On the other hand, when the secondary pressure P2 in the fluid passage L0 rises above the set pressure, the pressure in the sixth chamber H6 of the pilot governor 50, which is in communication with the secondary pressure introduction passage L2, rises, and the sub-diaphragm D0 is displaced toward the fifth chamber H5 side by the pressure in the sixth chamber H6 against the biasing force of the second spring G2. As a result, the sub-valve body V0 of the pilot governor 50 moves to the closed side, and the fluid in the drive pressure chamber H2 of the main governor 10 is discharged to the secondary side of the fluid passage L0 via the drive pressure introduction passage L3, the connecting passage L5, and the secondary pressure introduction passage L2. As a result, the pressure in the drive pressure chamber H2 drops, and the biasing force of the first spring G1 displaces the first diaphragm D1 toward the drive pressure chamber H2 side, causing the main valve body V1 of the main governor 10 to move to the closed side, lowering the secondary pressure P2 in the fluid passage L0 and adjusting the secondary pressure P2 to the set pressure.

[0027] Now, the pressure regulating device according to the first embodiment, while maintaining a relatively simple configuration, is equipped with a top space pressure regulating mechanism SY that is detachably attached to the bottom V1b of the main valve body V1 and has a connecting passage that connects the top space SP1, which is surrounded by a wall formed by the top V1a of the main valve body V1 and the inner wall of the fluid flow path base HB that constitutes the fluid flow path L0, to the secondary side of the main valve body V1, in order to adjust the pressure regulating characteristics by applying force to the main valve body V1 in the opening or closing direction. Here, the main valve body V1 is configured to slide freely in the top space SP1 formed in the fluid flow path base HB (an example of a wall portion) that constitutes the fluid flow path L0, and the space between the inner circumferential surface of the top space SP1 and the outer circumferential surface of the main valve body V1 is sealed by the second seal member SR2. In addition, the valve stem 16 is provided so as to penetrate the fluid flow path base HB, and the space between the valve stem 16 and the fluid flow path base HB is sealed by the first seal member SR1.

[0028] Furthermore, the ceiling space pressure adjustment mechanism SY includes a flow straightening section MO that straightens the flow of fluid passing from the primary side to the secondary side of the main valve body V1. The flow straightening section MO has a secondary side opening KM1a, which is the secondary side opening of the communication passage, at the tip side opposite to the main valve body V1 through which the fluid straightened by the flow straightening section MO passes. To elaborate, the first connecting passage KM1, which connects the secondary opening KM1a formed at the tip of the flow straightening section MO (the part through which the fluid whose flow rate has been adjusted in the flow straightening section MO) to the gap space SP2, the gap space SP2, and the second connecting passage KM2 (an example of a valve body connecting passage) provided in the main valve body V1 and connecting the gap space SP2 to the top space SP1, function as the aforementioned connecting passages, that is, connecting the top space SP1 and the secondary side of the main valve body V1. The first connecting passage KM1 is configured to be coaxial with the axis of the flow straightening section MO.

[0029] Furthermore, the rectifier MO has a frustum shape in which, when mounted on the bottom V1b of the main valve body V1, the diameter gradually decreases from the top V1a towards the bottom V2b in the opening and closing direction of the main valve body V1 along the valve stem 16, and the secondary opening KM1a is provided on the tip side of the frustum-shaped rectifier MO. In addition, when mounted on the bottom V1b of the main valve body V1, the rectifier MO is provided at a position corresponding to the main opening K1 in the opening and closing direction.

[0030] Furthermore, the ceiling space pressure adjustment mechanism SY has a relative position adjustment section (consisting of a female screw section MN and a male screw section ON, described later) that can adjust the relative position between the main valve body V1 and the flow straightening section MO in the opening and closing direction when the flow straightening section MO is attached to the bottom V1b of the main valve body V1. By operating the relative position adjustment section, the diameter of the flow straightening section MO located at the position of the main opening section K1 in the opening and closing direction (the position where the valve seat V2 is provided in the opening and closing direction in Figure 2) can be freely adjusted.

[0031] To elaborate, first, the bottom portion V1b of the main valve body V1 has a recessed portion V1O formed on the bottom side of its inner circumferential surface, with a female threaded portion MN formed thereon. The rectifier portion MO is configured to be attachable to the main valve body V1 in such a way that a male threaded portion ON formed on its outer circumferential surface screws into the female threaded portion MN of the main valve body V1. When the rectifier portion MO is attached to the main valve body V1, a gap space SP2 is formed between the recessed portion V1O of the main valve body V1 and the top of the rectifier portion MO, and a third sealing member SR3 is provided between the recessed portion V1O and the top of the rectifier portion MO to seal the space between them. In other words, the female threaded portion MN on the main valve body V1 and the male threaded portion ON on the rectifier portion MO function as the relative position adjustment portion described above.

[0032] Now, the rectifier MO has a shape in which, when mounted on the bottom V1b of the main valve body V1, its diameter gradually decreases from the top V1a towards the bottom V1b in the opening and closing direction of the main valve body V1 along the valve stem 16. In this first embodiment, as shown in Figure 2, when mounted on the bottom V1b of the main valve body V1, it has at least two or more diameter-reduced portions (three in this embodiment: MO1, MO2, MO3) with different degrees of diameter reduction at different positions in the opening and closing direction of the main valve body V1 along the valve stem 16. Specifically, in the configuration shown in Figure 2, the main valve body V1 is provided in the order described above, from the top V1a to the bottom V1b, in the opening and closing direction, with a first diameter reduction portion MO1 having a large diameter and a small degree of reduction, a second diameter reduction portion MO2 having a smaller diameter and a greater degree of reduction than the first diameter reduction portion MO1, and a third diameter reduction portion MO3 having a smaller diameter and a greater degree of reduction than the second diameter reduction portion MO2. With the rectifier MO having the above configuration attached to the main valve body V1, the diameter of the rectifier MO located at the position of the main opening K1 in the opening and closing direction (the position where the valve seat V2 is provided in the opening and closing direction in Figure 2) is adjusted by adjusting the screwing state of the female screw part MN and the male screw part ON, which serve as relative position adjustment parts.

[0033] [Second Embodiment] In this second embodiment, the configuration of the rectifier MO differs from that of the first embodiment, so the following will mainly describe these differences. As shown in Figure 3, the rectifier section MO, which serves as the upper space pressure adjustment mechanism SY, is provided with at least one fin Y (multiple in the second embodiment) along the direction toward the tip side (the side moving from the top V1a to the bottom V1b in Figure 2) in the area where the first diameter reduction section MO1, the second diameter reduction section MO2, and the third diameter reduction section MO3 are provided in the first embodiment. These multiple fins Y are arranged spirally around the axis of the rectifier section MO, forming valleys T between them that are recessed inward from the surface of the first diameter reduction section MO1 to the third diameter reduction section MO3. This improves the rectification effect at the bottom V1b side of the valve body V1, thereby stabilizing the pressure transmitted to the bottom space SP1.

[0034] [Test Results] Next, we will describe test results showing that in the pressure regulating device according to the first embodiment described above, a force can be applied to the main valve body V1 in either the opening or closing direction. As shown in Figure 4, according to the pressure regulating device of the first embodiment described above, the valve upper pressure as the upper space SP1 decreases as the fluid flow rate (fluid velocity) increases due to the Venturi effect of the rectifier MO, which reduces the pressure at the secondary opening KM1a. This suppresses the rise in the valve upper pressure of the upper space SP1 more than the valve lower pressure (pressure on the secondary side of the main valve body V1), and thus it can be said that a boost effect is achieved to pull up the main valve body V1 at high flow rates.

[0035] [Another embodiment] (1) The fins according to the second embodiment described above can take on various shapes as long as they conform to the surface of the flow straightening section MO. For example, as shown in Figure 5, they may be made up of plate-shaped bodies Y that conform to the axis of the flow straightening section MO, rather than being helical. In this alternative embodiment as well, valleys T are formed between the multiple plate-shaped bodies Y, recessed inward from the surface of the first diameter reduction section MO1 to the third diameter reduction section MO3. With this configuration, the plate-shaped bodies Y act as walls, suppressing collisions between jets and reducing noise.

[0036] (2) In the above embodiment, the ceiling space pressure adjustment mechanism SY was shown to have a frustum-shaped rectifier MO, but the rectifier MO does not have to be frustum-shaped, and may be cylindrical, for example. Furthermore, the configuration may not even include a rectifier unit MO itself.

[0037] (3) The ceiling space pressure adjustment mechanism SY may be configured such that the opening direction of the secondary side opening KM1a is directed toward the primary side of the fluid flow path L0, as shown in Figure 6. In other words, when the main valve body V1 is in the open state, a configuration may be adopted in which the opening direction of the secondary opening KM1a is upstream of the fluid flow path L0. Here, the primary side of the fluid flow path L0 refers to the upstream side of the region connecting the annular valve seat V2 and the seating portion of the main valve body V1 that sits on the valve seat V2, and the secondary side of the fluid flow path L0 refers to the downstream side of the region connecting the annular valve seat V2 and the seating portion of the main valve body V1 that sits on the valve seat V2.

[0038] (4) The shapes of the first diameter reduction section MO1 to the third diameter reduction section MO3 can be various shapes as long as they are diameter reduction towards the tip.

[0039] (5) In the above embodiment, the rectifier MO is shown to have at least two or more diameter-reduced portions (three in this embodiment: MO1, MO2, MO3) with different degrees of diameter reduction at different positions along the valve stem 16 in the opening and closing direction of the main valve body V1. For example, the rectifier MO may have a portion between the first diameter-reduced portion MO1 and the second diameter-reduced portion MO2 that has approximately the same diameter in the opening and closing direction of the main valve body V1.

[0040] Furthermore, the configurations disclosed in the above embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with configurations disclosed in other embodiments, provided that no inconsistencies arise. Moreover, the embodiments disclosed herein are illustrative, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the object of the present invention. [Industrial applicability]

[0041] The pressure regulating device of the present invention can be effectively used as a pressure regulating device that can ensure an appropriate flow rate while effectively reducing noise for each valve opening degree. [Explanation of Symbols]

[0042] 16: Valve stem HB: Fluid flow channel base KM1: 1st communication passage KM1a: Secondary side opening KM2: 2nd communication passage MN: Female screw part MO: Rectifier MO1: 1st diameter reduction part MO2: 2nd diameter reduction part MO3: 3rd diameter reduction part SP1: Celestial Space SP2: Gap space SY: Ceiling Space Pressure Adjustment Mechanism V1: Main valve body V1O: Concave notch V1a: Heavenly part V1b: Bottom V2: Valve seat V2b: Bottom Y: Finn

Claims

1. A pressure regulating device for controlling the secondary pressure of a valve body by adjusting the opening degree of the valve body between a closed state in which the valve body is seated against a valve seat formed around an opening and an open state in which the valve body is separated from the valve seat, with the bottom side opposite to the top side of the valve body to which the valve stem is connected facing the secondary side of the piping through which the fluid flows, The valve body is equipped with a top space pressure adjustment mechanism that is detachably attached to the bottom of the valve body and has a communication passage on the top side of the valve body that connects the top space, which is surrounded by the wall portion including the top of the valve body, with the secondary side of the valve body. The aforementioned ceiling space pressure adjustment mechanism includes a flow straightening section that straightens the flow of fluid passing from the primary side to the secondary side of the valve body, The flow straightening section has a secondary opening, which is the secondary opening of the communication passage, at the tip side opposite to the valve body, through which the fluid straightened by the flow straightening section flows. The rectifier portion has a frustum shape in which, when the valve body is mounted on the bottom, the diameter gradually decreases from the top towards the bottom in the opening and closing direction of the valve body along the valve shaft, The secondary opening is provided on the tip side of the frustoconical flow straightening portion, The flow straightening portion is provided at a position corresponding to the opening in the opening / closing direction when the valve body is mounted on the bottom, The aforementioned ceiling space pressure adjustment mechanism has a relative position adjustment unit that can adjust the relative position between the valve body and the flow straightening unit in the opening and closing direction when the flow straightening unit is attached to the bottom of the valve body, A pressure regulating device configured to allow adjustment of the diameter of the flow rectifier located at the opening position in the opening and closing direction by operating the relative position adjustment unit.

2. A pressure regulating device for controlling the secondary pressure of a valve body by adjusting the opening degree of the valve body between a closed state in which the valve body is seated on a valve seat formed around an opening and an open state in which the valve body is separated from the valve seat, with the bottom of the valve body opposite to the top side of the valve body to which the valve stem is connected facing toward the secondary side of a pipe through which fluid flows, The valve body is equipped with a top space pressure adjustment mechanism that is detachably attached to the bottom of the valve body and has a communication passage on the top side of the valve body that connects the top space, which is surrounded by the wall portion including the top of the valve body, with the secondary side of the valve body. The aforementioned ceiling space pressure adjustment mechanism includes a flow straightening section that straightens the flow of fluid passing from the primary side to the secondary side of the valve body, The flow straightening section has a secondary opening, which is the secondary opening of the communication passage, at the tip side opposite to the valve body, through which the fluid straightened by the flow straightening section flows. The rectifier portion has a frustum shape in which, when the valve body is mounted on the bottom, the diameter gradually decreases from the top towards the bottom in the opening and closing direction of the valve body along the valve shaft, The secondary opening is provided on the tip side of the frustoconical flow straightening portion, The flow straightening section is provided with fins that, when the valve body is mounted on the bottom, are provided along the direction from the top to the bottom of the pressure straightening device.

3. A pressure regulating device for controlling the secondary pressure of a valve body by adjusting the opening degree of the valve body between a closed state in which the valve body is seated on a valve seat formed around an opening and an open state in which the valve body is separated from the valve seat, with the bottom of the valve body opposite to the top side of the valve body to which the valve stem is connected facing toward the secondary side of a pipe through which fluid flows, The valve body is equipped with a top space pressure adjustment mechanism that is detachably attached to the bottom of the valve body and has a communication passage on the top side of the valve body that connects the top space, which is surrounded by the wall portion including the top of the valve body, with the secondary side of the valve body. The communication passage formed in the ceiling space pressure adjustment mechanism is a pressure regulating device that connects the ceiling space and the secondary side via a valve body communication passage provided in the valve body.

4. The pressure regulating device according to claim 1, wherein the rectifying portion is provided with fins that are aligned in the direction from the top to the bottom when the valve body is mounted on the bottom.

5. The pressure regulating device according to claim 2 or 4, wherein the fins are arranged spirally around the axis of the frustoconical flow rectifier.

6. The pressure regulating device according to any one of claims 1 to 3, wherein the ceiling space pressure regulating mechanism has an opening direction of the secondary side opening portion, which is the secondary side opening of the communication passage, directed toward the primary side of the piping.

7. The pressure regulating device according to any one of claims 1 to 6, wherein the communication passage formed in the ceiling space pressure regulating mechanism connects the ceiling space and the secondary side via a valve body communication passage provided in the valve body.

Images