阅读说明：本技术 阀门机构 (Valve mechanism ) 是由 小池正 于 2019-01-31 设计创作，主要内容包括：流量调节阀(10)包括:壳体(11),形成有流体的流入口(12)以及流出口(13)和连接该流入口和流出口的流路(14)；阀口部件(20),设置在流路(14),具有在上下游方向上贯通的阀口(21),为筒状；以及阀体(34),从下游侧向阀口(21)进退,以调节阀口(21)的下游侧开口(22)的开度。阀口(21)构成为具有开口直径小于上游侧开口的节流部(24),阀体(34)具有锥形部(34b)以及凸缘部(34a),所述锥形部(34b)在前进时进入阀口(21)的内部,所述凸缘部(34a)形成在锥形部(34b)的下游侧,具有接触面(34e),所述接触面(34e)位于与阀口部件(20)的端面(29a)平行的位置,当阀口(21)完全关闭时与端面(29a)面接触,当下游侧开口(22)是规定开度时,阀口(21)的流体的通过面积在节流部(24)最小。(The flow rate control valve (10) comprises a housing (11) in which an inlet (12) and an outlet (13) for a fluid are formed and a flow path (14) connecting the inlet and the outlet; a valve port member (20) which is provided in the flow path (14), has a valve port (21) penetrating in the upstream and downstream directions, and is cylindrical; and a valve body (34) that advances and retracts from the downstream side to the valve port (21) to adjust the opening of the downstream-side opening (22) of the valve port (21). The valve port (21) is configured to have a throttle portion (24) having an opening diameter smaller than that of the upstream side opening, the valve body (34) has a tapered portion (34b) that enters the interior of the valve port (21) when the valve port advances, and a flange portion (34a) that is formed on the downstream side of the tapered portion (34b) and has a contact surface (34e) that is positioned parallel to the end surface (29a) of the valve port member (20) and that is in surface contact with the end surface (29a) when the valve port (21) is fully closed, and when the downstream side opening (22) is a predetermined opening degree, the area through which fluid passes through the valve port (21) is smallest at the throttle portion (24).)

1. A valve mechanism characterized by:

the valve mechanism includes:

a casing having an inlet and an outlet for a fluid and a flow path connecting the inlet and the outlet,

a valve port member provided in the flow path, having a valve port penetrating in the upstream and downstream directions, being cylindrical, and

a valve body that advances and retracts from a downstream side to the valve port to adjust an opening degree of a downstream side opening of the valve port;

the valve port has a throttle portion having an opening diameter smaller than the upstream side opening,

the valve body has an inlet portion that enters the interior of the valve port when the valve body is advanced, and a flange portion that is formed at a downstream end of the inlet portion and has a contact surface that is positioned parallel to a downstream-side end surface of the valve port member, and that is in surface-contact with the downstream-side end surface when the valve port is fully closed, and that has a minimum area through which fluid passes through the valve port at the throttle portion when the downstream-side opening is at a predetermined opening degree.

2. The valve-gate mechanism of claim 1, wherein:

the valve port has a tapered portion whose opening diameter gradually increases from the throttle portion to the downstream side opening,

the inlet portion of the valve body has a tapered portion that is located at a position apart from and parallel to the tapered portion when the downstream side opening is a predetermined opening degree,

the flange portion is formed at a downstream end of the tapered portion.

3. The valve-gate mechanism of claim 1, wherein:

the valve port has a cylindrical portion having an opening diameter that is constant from the throttle portion to the downstream side opening,

the inlet portion of the valve body has a cylindrical portion that is located apart from and parallel to the cylindrical portion when the downstream side opening is a predetermined opening degree,

the flange portion is formed at a downstream end of the cylindrical portion.

4. A valve train according to any one of claims 1 to 3, wherein:

the downstream end surface of the port member and the contact surface of the flange portion are orthogonal to the advancing and retreating direction of the valve body.

5. The valve-gate mechanism of claim 2, wherein:

The downstream end surface of the port member and the contact surface of the flange portion are inclined toward the upstream side from the direction orthogonal to the advancing and retreating direction of the valve body.

6. The valve-gate mechanism of claim 5, wherein:

the angle formed by the downstream side end surface of the valve port component and the conical part of the valve port is a right angle.

7. The valve-gate mechanism of claim 2, wherein:

the tapered portion of the valve body is in surface contact with the tapered portion of the valve port, closes the downstream-side opening, and protrudes from the throttle portion toward the upstream side in a state of being in contact with the tapered portion of the valve port.

8. The valve-gate mechanism of claim 7, wherein:

the valve body has a cylindrical portion formed to have the same outer diameter as the diameter of the upstream end of the tapered portion of the valve body and extending from the upstream end toward the upstream side.

Technical Field

The present invention relates to a valve mechanism for discharging fluid such as sewage and steam from a valve port, and more particularly to a countermeasure for removing foreign matter from the valve port.

Background

Valve mechanisms for discharging fluids such as sewage, steam, etc. from a valve port are well known. In such a valve mechanism, foreign matter contained in the fluid is accumulated on the valve port to block the valve port. For example, patent document 1 discloses a technique for solving this problem. The technique disclosed in patent document 1 is such that a foreign matter removal member disposed in a valve port (orifice) is rotated by a fluid passing through the valve port, thereby automatically removing foreign matter adhering to and accumulating in the valve port.

Patent document 1 Japanese patent laid-open No. 2001-27391

However, in the above-described technique, there is a problem that foreign matter having a large adhesion force cannot be sufficiently removed. In addition, in the valve mechanism in which the valve element is advanced and retreated in the valve port to adjust the opening degree of the valve port, it is substantially difficult to dispose the foreign matter removing member in the valve port as in the above-described technique.

Disclosure of Invention

In view of the above, an object of the present invention is to prevent foreign matter from adhering and accumulating on a valve port or its periphery in a valve mechanism in which the opening of the valve port is adjusted by advancing and retracting a valve element in the valve port.

The valve mechanism of the present invention includes a housing, a cylindrical valve port member, and a valve body. The casing is formed with an inlet and an outlet for fluid and a flow path connecting the inlet and the outlet. The valve port member is provided in the flow path and has a valve port penetrating in the upstream and downstream directions. The valve body advances and retreats from the downstream side to the valve port to adjust the opening of the downstream side opening of the valve port. And, the valve port has a throttle portion having an opening diameter smaller than the upstream-side opening. The valve body is configured to have an inlet portion that enters the inside of the valve port when the valve body moves forward, and a flange portion that minimizes a fluid passage area of the valve port at the throttle portion when the downstream-side opening is a predetermined opening degree. The flange portion is formed at a downstream end of the inlet portion, and has a contact surface that is positioned parallel to a downstream-side end surface of the valve port member and that comes into surface-contact with the downstream-side end surface when the valve port is fully closed.

(Effect of the invention)

According to the valve mechanism of the present invention, foreign matter can be prevented from adhering and accumulating on the valve port or its periphery.

Drawings

Fig. 1 is a sectional view showing a schematic configuration of a flow rate control valve (valve mechanism) according to an embodiment.

Fig. 2 is an enlarged cross-sectional view of a main portion of the flow rate control valve.

Fig. 3 is a sectional view showing a state in which the valve port according to the embodiment is completely closed.

Fig. 4 is a sectional view showing a state in which the valve port according to the embodiment is at a slight opening degree.

Fig. 5 is a sectional view showing a state in which the valve port according to the other embodiment is completely closed.

Fig. 6 is a sectional view showing a state in which the valve port according to the other embodiment is completely closed.

Detailed Description

Hereinafter, embodiments of the present application will be described with reference to the drawings. The following embodiments are merely preferred examples in nature and are not intended to limit the scope of the technology disclosed herein, its applications, or its uses.

The flow rate control valve 10 of the present embodiment is provided in, for example, a steam system, and is configured to discharge steam at a constant flow rate, and constitutes a valve mechanism according to the claims of the present application. Further, steam is an example of the fluid to which the flow rate adjustment valve 10 is applied.

As shown in fig. 1, the flow rate adjustment valve 10 of the present embodiment includes a housing 11, a valve port member 20, and a flow rate adjustment mechanism 30.

An inlet 12 and an outlet 13 for steam and a flow path 14 connecting the inlet 12 and the outlet 13 are formed in the casing 11. The inlet port 12 and the outlet port 13 are opposed to each other in the upstream and downstream directions, and their opening axes are coaxial. The flow path 14 includes an upstream side passage 15, a port passage 16, and a downstream side passage 17.

The upstream side passage 15 is a passage extending substantially in the direction of the opening axis, and is connected to the inflow port 12. The downstream side passage 17 is a passage extending substantially in the direction of the opening axis, and is connected to the outflow port 13. The port passage 16 is a passage extending substantially in the radial direction around the opening axis (the radial direction of a circle centered on the opening axis), and has one end connected to the upstream passage 15 and the other end connected to the downstream passage 17. Further, a valve port member 20, which will be described later, is provided in the valve port passage 16.

The valve port member 20 is formed substantially in a cylindrical shape, and is provided in the valve port passage 16 as described above. As shown in FIG. 2, the valve port member 20 is threadably mounted to the wall of the port channel 16 in both the upstream and downstream directions. In fig. 2, the upper side is the downstream side, and the lower side is the upstream side. A valve port 21 penetrating in the upstream and downstream directions is formed in the center of the valve port member 20. The valve port member 20 has a protrusion 29 formed at the center of the downstream end surface 28. The protrusion 29 bulges toward the downstream side in the edge portion of the valve port 21 in the downstream side end surface 28. That is, the end surface 29a of the projection 29 is an opening surface of the valve port 21 formed in a flat surface, and constitutes a part of the downstream end surface 28. The valve port 21 will be described in detail later.

The flow rate adjusting mechanism 30 is used to adjust the discharge flow rate of the steam in the flow rate adjusting valve 10. The flow rate adjusting mechanism 30 is attached to the outer peripheral wall of the housing 11 where the outer end of the port passage 16 is located, that is, the outer peripheral wall of the housing 11 facing the port member 20. The flow rate adjustment mechanism 30 includes a holding member 31, a valve member 32, and a cover 38.

The holding member 31 holds the valve member 32 and is screwed to the outer peripheral wall of the housing 11. The valve member 32 has a main shaft portion 33 and a valve body 34. The main shaft portion 33 is formed in a rod shape having a circular cross section, and is provided coaxially with the valve port 21 (valve port member 20) at a position facing the valve port 21. The main shaft 33 is screwed into the screw hole 31a of the holding member 31 and held. Specifically, the lower end portion (end portion on the valve port 21 side) of the main shaft portion 33 is a screw portion 33a having a male screw formed on the outer peripheral surface thereof, and the screw portion 33a is screwed into the screw hole 31a of the holding member 31. The valve body 34 is continuously formed to the lower end of the main shaft portion 33. The valve body 34 will be described in detail later. A sealing material 36 is attached to the holding member 31 via a pressing member 37 above the screw hole 31a, and the sealing material 36 seals a gap between the holding member 31 and the main shaft portion 33 of the valve member 32. A cap 38 that covers the upper end of the valve member 32 and the pressing member 37 is screwed to the holding member 31.

The flow rate adjustment mechanism 30 is configured to adjust the opening degree of the downstream-side opening 22 in the valve port 21 by rotating the valve member 32 (main shaft portion 33) and moving the valve body 34 (valve member 32) forward and backward from the downstream side to the valve port 21. The opening degree of the valve port 21 is adjusted to adjust the discharge flow rate of the steam from the valve port 21. Specifically, the main shaft 33 rotates to move (displace) in the arrow direction shown in fig. 1. Thereby, the valve body 34 is advanced and retreated toward the valve port 21. Since the valve body 34 moves forward and enters the valve port 21, the opening area (opening degree) of the downstream side opening 22 of the valve port 21 decreases, and the discharge flow rate of the steam decreases.

Valve port and valve body structure

As shown in fig. 2, the valve port 21 has a downstream-side opening 22, a tapered portion 23, a throttle portion 24, a tapered portion 25, a cylindrical portion 26, and an upstream-side opening 27. These downstream opening 22, tapered portion 23, and the like are formed continuously in this order from the downstream side. The downstream opening 22 is an opening at the downstream end of the valve port 21, and is formed in an end surface 29a of the projection 29. The opening diameter of the throttle portion 24 is smaller than the upstream side opening 27. The orifice 24 is a portion having the smallest opening diameter in the valve port 21. The tapered portion 23 is a portion connected to the downstream side opening 22 and the throttle portion 24, and the opening diameter gradually becomes larger from the throttle portion 24 toward the downstream side opening 22. The tapered portion 25 is continuously formed to the throttle portion 24, and the opening diameter gradually increases toward the upstream side. The cylindrical portion 26 is a portion connected to the upstream end of the tapered portion 25 and the upstream-side opening 27, and has a constant opening diameter.

The valve body 34 has a flange portion 34a, a tapered portion 34b, a cylindrical portion 34c, and a tapered portion 34d, which are continuously formed, in this order from the main shaft portion 33 side. The flange portion 34a is a circular plate member formed to have an outer diameter larger than the diameter of the main shaft portion 33. The flange portion 34a has an outer diameter larger than the opening diameter of the downstream opening 22 of the valve port 21 and larger than the outer diameter of the protrusion 29 of the valve port member 20.

The tapered portion 34b, the cylindrical portion 34c, and the tapered portion 34d are entry portions that enter the interior of the valve port 21 when the valve body 34 advances. The tapered portion 34b extends from the upstream side surface of the flange portion 34a toward the upstream side, and the outer diameter decreases toward the upstream side. As shown in fig. 3, the tapered portion 34b enters the valve port 21, and is in surface contact with the tapered portion 23 of the valve port 21 to close the downstream-side opening 22. That is, in the valve port 21, the tapered portion 23 serves as a seal portion. The tapered portion 34b is formed to have a length (axial length of the valve port 21) protruding from the throttle portion 24 toward the downstream side in a state of surface contact with the tapered portion 23 of the valve port 21. Therefore, after the tapered portion 34b of the valve element 34 comes into surface contact with the tapered portion 23 of the valve port 21, the downstream-side opening 22 (valve port 21) is completely closed.

The cylindrical portion 34c is a portion extending from the upstream end of the tapered portion 34b toward the upstream side, and has the same outer diameter as the upstream end of the tapered portion 34 b. That is, the cylindrical portion 34c has a constant outer diameter in the axial direction. The tapered portion 34d extends from the upstream end of the cylindrical portion 34c toward the upstream side, and the outer diameter decreases toward the upstream side. The tapered portion 34d is formed longer than the tapered portion 34b and the cylindrical portion 34 c.

The upstream side surface of the flange portion 34a serves as a contact surface 34 e. The contact surface 34e of the flange portion 34a is a flat surface that is positioned parallel to the end surface 29a (downstream side end surface 28) of the projection 29 of the valve port member 20. The contact surface 34e of the flange portion 34a is a portion that comes into surface contact with the end surface 29a (downstream side end surface 28) of the protrusion 29 when the valve port 21 is completely closed. The end surface 29a of the valve port member 20 and the contact surface 34e of the flange portion 34a are both surfaces perpendicular to the advancing and retreating direction of the valve element 34.

As shown in fig. 4, the valve port 21 and the valve body 34 are configured such that the area through which steam passes through the valve port 21 is smallest in the throttle portion 24 when the downstream side opening 22 has a predetermined small opening degree. Fig. 4 shows a state in which the valve body 34 (valve member 32) is slightly retracted (moved upward) from the fully closed state. In fig. 3 and 4, the main shaft portion 33 of the valve member 32 is omitted. That is, since the cylindrical portion 34c is formed on the upstream side of the tapered portion 34b in the valve body 34, even if the valve body 34 is slightly retracted, the clearance (i.e., the steam passage area) between the throttle portion 24 and the valve body 34 can be minimized. When the downstream-side opening 22 (valve port 21) is fully opened, the valve body 34 is retracted until the flange portion 34a comes into contact with the bottom surface of the holding member 31 (the state shown in fig. 1).

In the flow rate control valve 10, the high-temperature and high-pressure steam flowing in from the inlet 12 flows into the upstream path 15 and the valve port path 16 in this order. The steam flowing into the port passage 16 is discharged from the outlet 13 to the outside through the port 21. When the steam passes through the valve port 21, the discharge flow rate of the steam is limited to a flow rate corresponding to the opening area (opening degree) of the downstream side opening 22.

Here, when steam passes through the valve port 21, foreign matter contained in the steam may be retained in the vicinity of the downstream side opening 22 of the valve port 21. In the flow rate control valve 10 of the present embodiment, the downstream-side opening 22 of the valve port 21 is set to the predetermined small opening degree in the case of normal operation. Since the steam passage area is smallest in the throttle portion 24 at the valve port 21, the flow rate of the inflowing steam is largest in the throttle portion 24. The contact surface 34e of the flange portion 34a is located in the vicinity of the downstream opening 22 in a state slightly separated from the end surface 29a (downstream side end surface 28) of the valve port member 20. The steam having passed through the throttle portion 24 flows through the tapered portion 23 and flows out from the downstream opening 22 toward the contact surface 34e of the flange portion 34a (see the dashed arrow shown in fig. 4). Therefore, the steam having a higher flow velocity impinges on the contact surface 34 e. The steam that has impinged on the contact surface 34e then flows while alternately impinging on the end surface 29a and the contact surface 34 e. In this way, the steam having a high flow velocity flows out of the downstream side opening 22 and then impinges on the contact surface 34e and the end surface 29a, so that the foreign matter retained on the downstream side opening 22, the contact surface 34e, and the end surface 29a flows downstream together with the steam.

At the predetermined slight opening, the tapered portion 34b of the valve body 34 is slightly separated from the tapered portion 23 of the valve port 21 and is positioned parallel to the tapered portion 23. The passage formed between the tapered portion 23 of the valve port 21 and the tapered portion 34b of the valve body 34 is larger than the passage area of the throttle portion 24, but the passage area is maintained much smaller than the passage areas of the cylindrical portion 34c and the upstream-side opening 27 of the valve port 21. Therefore, the steam flows in a state where the flow velocity is not reduced so much when passing through the tapered portion 23. That is, the fluid force of the steam flowing through the tapered portion 23 is almost maintained.

The contact surface 34e is slightly separated from the end surface 29a and is positioned parallel to the end surface 29 a. The passage formed between the contact surface 34e and the end surface 29a is larger than the passage area of the throttle portion 24, but the passage area is maintained much smaller than the passage areas of the cylindrical portion 34c of the valve port 21 and the upstream-side opening 27. Therefore, the steam flows in a state where the flow velocity is not reduced so much when passing between the contact surface 34e and the end surface 29a, as described above.

As described above, the flow rate control valve 10 of the above embodiment is configured such that the orifice 24 is provided in the valve port 21, and when the downstream opening 22 of the valve port 21 is a predetermined opening degree (a predetermined minute opening degree), the steam passage area of the valve port 21 is the smallest in the orifice 24. The valve body 34 has an inlet portion (a tapered portion 34b, a cylindrical portion 34c, a tapered portion 34d) that enters the interior of the valve port 21 when the valve body moves forward, and a flange portion 34a that is formed at the downstream end of the inlet portion and has a contact surface 34e that is positioned parallel to the end surface 29a (the downstream-side end surface 28) of the valve port member 20 and that is in surface contact with the end surface 29a when the valve port 21 is completely closed. Therefore, the flow velocity of the steam can be maximized in the throttle portion 24, and the steam having a high flow velocity can be caused to flow out from the downstream opening 22 and impinge on the contact surface 34e of the flange portion 34a and the end surface 29a of the valve port member 20. In this way, the foreign substances accumulated on the downstream side opening 22, the contact surface 34e, and the end surface 29a can be caused to flow downstream by the steam. Therefore, foreign matter can be prevented from adhering and accumulating on the valve port 21 or the peripheral end surface 29a and the flange 34 a.

The valve port 21 has a tapered portion 23, and the opening diameter of the tapered portion 23 gradually increases from the throttle portion 24 to the downstream opening 22. The valve body 34 has a tapered portion 34b, and the tapered portion 34b is located at a position apart from and parallel to the tapered portion 23 when the downstream side opening 22 is a predetermined opening degree (a predetermined small opening degree). According to this configuration, when the steam passes through the tapered portion 23 from the throttle portion 24, the steam can be flowed without a slight decrease in the flow rate. That is, the steam can be caused to flow out from the downstream opening 22 and impinge on the contact surface 34e of the flange portion 34a, etc., while substantially maintaining the fluid force of the steam. Therefore, the foreign substances accumulated on the downstream side opening 22, the contact surface 34e, and the end surface 29a can be efficiently flowed to the downstream side by the steam.

The end surface 29a (downstream side end surface 28) of the valve port member 20 and the contact surface 34e of the flange portion 34a are orthogonal to the advancing and retreating direction of the valve body 34 (i.e., the opening axis of the valve port 21). Therefore, as in the above-described embodiment, in the aspect in which the opening diameter of the tapered portion 23 of the valve port 21 gradually increases from the throttle portion 24 toward the downstream side opening 22, the component force of the steam acting in the flow direction in the impact force with which the steam strikes the contact surface 34e can be increased. Therefore, the foreign matter accumulated on the contact surface 34e and the end surface 29a can be efficiently flowed by the steam.

The tapered portion 34b of the valve body 34 protrudes downstream from the throttle portion 24 in a state of surface contact with the tapered portion 23 of the valve port 21. The valve body 34 is provided with a cylindrical portion 34c having the same outer diameter as the diameter of the downstream side of the tapered portion 34b and extending from the downstream end to the downstream side. According to this configuration, in a state where the valve body 34 is slightly retracted and the downstream opening 22 is set to a small opening degree, a gap (i.e., a steam passage area) can be formed between the throttle portion 24 and the cylindrical portion 34c (valve body 34), and the gap can be minimized. Further, since the cylindrical portion 34c has a certain length, the clearance between the throttle portion 24 and the cylindrical portion 34c (valve element 34) can be kept to a minimum in a wide opening degree range. Therefore, the range of the opening degree adjustment of the downstream side opening 22 becomes large.

In the above-described embodiment, in the event of deposition of foreign matter on the end surface 29a of the protruding portion 29, the valve body 34 is advanced to bring the contact surface 34e of the flange portion 34a into surface contact with the end surface 29a of the protruding portion 29 (i.e., in a completely closed state), and the foreign matter deposited on the end surface 29a is crushed by the flange portion 34 a. Since the protrusion 29 is raised in the valve port member 20, the crushed foreign matter flows from the protrusion 29 to the periphery. Thus, foreign matter can be removed from the end surface 29 a.

(other embodiments)

In the flow rate control valve 10 of the above embodiment, the structures of the valve port and the valve body may be changed as described below. For example, as shown in fig. 5, in the above embodiment, the configurations of the contact surface of the flange portion and the end surface of the protruding portion may be changed. Specifically, the contact surface 42a of the flange portion 42 of the valve body 34 is inclined toward the upstream side from the direction orthogonal to the advancing and retreating direction of the valve body 34. In the valve port member 20, the end surface of the protrusion 41 is also formed as an inclined surface 41a inclined toward the upstream side from a direction orthogonal to the advancing and retreating direction of the valve element 34 so as to correspond to the contact surface 42a (constituting a part of the downstream end surface 28). That is, the contact surface 42a and the inclined surface 41a are parallel to each other. In the valve port member 20, the angle θ a formed by the inclined surface 41a and the tapered portion 23 is a right angle (90 degrees). Similarly, in the valve body 34, the angle θ b formed by the contact surface 42a and the tapered portion 34b is also a right angle (90 degrees).

With this configuration, the steam can strike the contact surface 42a at right angles from the downstream opening 22 (see the dashed arrow shown in fig. 5). Therefore, the impact force of the steam on the contact surface 42a can be increased, and the foreign matter accumulated on the contact surface 42a and the inclined surface 41a can be efficiently flowed to the downstream side by the steam.

The valve port 21 of the above embodiment has a tapered portion whose opening diameter gradually increases from the throttle portion to the downstream opening, and may have a cylindrical portion 45 whose opening diameter is constant from the throttle portion 46 to the downstream opening 44, as shown in fig. 6. At this time, the inlet portion of the valve body 34 has a cylindrical portion 47a instead of the tapered portion. That is, the valve body 34 at this time has a flange portion 34a, a cylindrical portion 47a, and a tapered portion 47 b. The columnar portion 47a is continuously formed on the upstream side surface of the flange portion 34 a. The tapered portion 47b is continuously formed at the upstream end of the cylindrical portion 47a, and the outer diameter gradually decreases toward the upstream side. When the downstream-side opening 44 is at the predetermined opening degree (predetermined small opening degree), the columnar portion 47a is located apart from and parallel to the columnar portion 45 of the valve port 21. In this embodiment, the steam can also be made to strike the contact surface 34e at right angles from the downstream opening 44 (see the dashed arrow shown in fig. 6). Therefore, the striking force with which the steam strikes the contact surface 34e can be increased.

Further, the flow rate control valve 10 of the above embodiment has been described with steam as the target fluid, but the present invention is not limited thereto, and for example, sewage may be used as the target fluid.

(possibility of Industrial use)

The present invention has a valve port and is useful for a valve mechanism that discharges fluid from the valve port.

(description of symbols)

10-flow regulating valve (valve mechanism); 11-a housing; 12-an inflow port; 13-an outflow opening; 14-flow path; 20-a valve port component; 21-valve port; 22. 44-downstream side opening; 23-a conical section; 24. 46-a throttle; 29 a-end face (downstream-side end face); 34-a valve body; 34a, 42-flange portion; 34 b-cone (entry); 34 c-cylindrical portion (entry portion); 34e, 42 a-contact surface; 41 a-inclined surface (downstream side end surface); 45-a cylindrical portion; 47 a-cylindrical portion (entry portion).