CN115046039A - Safety valve - Google Patents

Abstract

The invention provides a safety valve which can rapidly reduce the fluid pressure of a main flow path. A safety valve (1) having: a housing (4); a valve seat (5) provided in the housing (4); a valve element (6) which is housed in the housing (4) so as to be capable of reciprocating, and which is seated on the valve seat (5) or separated from the valve seat (5) in accordance with the fluid pressure of the main flow path (2); and an urging member (8) that urges the valve element (6) toward the valve seat (5), wherein the safety valve (1) has: a throttle section (75) that throttles the fluid that has passed between the housing (4) and the valve body (6) and flows toward the discharge flow path (3); and a partition space (S2) which is partitioned on the back surface side of the valve body (6) and communicates with the discharge flow path (3).

Description

Safety valve

Technical Field

The present invention relates to a relief valve that discharges excessive internal pressure.

Background

A safety valve is provided in piping or fluid equipment, and the safety valve opens when the pressure of an internal fluid abnormally increases due to some influence, discharges the internal fluid, and closes as the pressure decreases.

For example, a safety valve disclosed in patent document 1 includes: a casing which is arranged to communicate with the main flow path and the discharge flow path arranged in a straight line shape to face each other; a valve seat provided in the housing; a valve element housed in a housing so as to be capable of reciprocating; and a spring that urges the valve body in a valve closing direction. In normal operation, the valve is closed by the biasing force of the spring, and the main flow path and the discharge flow path are in a non-communicating state. When the fluid pressure in the main flow path becomes equal to or higher than a predetermined value, the valve body moves against the biasing force of the spring, separates from the valve seat and opens the valve, and a part of the fluid in the main flow path is discharged to the discharge flow path, thereby maintaining the fluid pressure in the main flow path at a constant value or lower.

Patent document 1: japanese patent laid-open publication No. 2014-145478 (page 5, FIG. 1)

In the safety valve of patent document 1, since the main flow path and the discharge flow path are arranged to be linearly opposed to each other, the fluid in the main flow path flows in the valve opening direction of the valve body when the valve is opened, and therefore, the movement of the valve body in the valve opening direction is prevented from being affected by the flow of the fluid. However, since the relief valve as in patent document 1 has a valve opening corresponding to the fluid pressure in the main flow path, the valve opening may not be fully opened, and the fluid pressure in the main flow path cannot be discharged immediately.

Disclosure of Invention

The present invention has been made in view of the above problems, and an object thereof is to provide a safety valve capable of rapidly reducing a fluid pressure in a main flow path.

In order to solve the above problem, a safety valve of the present invention includes: a housing; a valve seat provided to the housing; a valve body which is housed in the housing so as to be capable of reciprocating, and which is seated on or separated from the valve seat in accordance with a fluid pressure of a main flow path; and an urging member that urges the valve element toward the valve seat, wherein the relief valve includes: a throttle portion that throttles the fluid that has passed between the housing and the valve body and flows toward a discharge flow path; and a partition space partitioned on a back surface side of the valve body and communicating with the discharge flow path.

Therefore, when the valve is opened, the fluid pressure in the main flow path acts on the valve body in the valve opening direction, and the venturi effect of the throttle portion acts to discharge the fluid in the partitioned space to the discharge flow path, whereby the valve body is pulled in the valve opening direction. Further, when the valve is closed, since it takes time for the fluid to be introduced from the discharge flow path to the partitioned space, a so-called damper effect is obtained, and the valve body is smoothly and slowly seated on the valve seat.

The partitioned space and the discharge flow path may be communicated with each other by a communication path extending in a reciprocating direction of the valve body.

Accordingly, since the communication passage extends in the reciprocating direction of the valve body, the fluid in the partitioned space can be smoothly discharged to the discharge passage through the communication passage by the movement of the valve body in the valve opening direction.

The relief valve may include a passage member that is separate from the housing, the communication passage may be provided at a center of the passage member, and the throttle portion may be provided on an outer periphery of the passage member.

Thus, the communication passage and the throttle portion can be formed integrally with each other with respect to the passage member, and therefore, the communication passage and the throttle portion can be easily manufactured with high accuracy.

The discharge flow path side of the throttle portion may be inclined toward the center of the passage member.

This makes it possible to guide the flow of the fluid passing through the restriction portion to the vicinity of the opening of the communication passage, and therefore, the fluid in the partitioned space can be easily introduced into the discharge passage.

The passage member may guide the valve body.

This makes it possible to form a large flow path between the valve body and the housing.

The passage member and the valve element may form the partitioned space.

Thus, the divided space can be formed by the passage member.

Drawings

Fig. 1 is a sectional view of a relief valve showing a closed state in embodiment 1 of the present invention.

Fig. 2 is a sectional view of a portion where the guide member is cut at a position partially different from that of fig. 1.

Fig. 3 is a sectional view showing the relief valve in an open state.

Fig. 4 is an explanatory diagram schematically showing a pressure distribution of the fluid flowing around the throttle portion.

Fig. 5 is a sectional view showing the relief valve in an open state according to example 2 of the present invention.

Description of the reference symbols

1: a safety valve; 2: a main flow path; 3: a discharge flow path; 4: a housing; 5: a valve seat; 6: a valve core; 7: a passage member; 8: a spring (urging member); 10: a safety valve; 71: a communication path; 72: a shaft portion; 75: a throttle section; 600: a valve core; 700: a passage member; s1: an interior space; s2: and (5) dividing the space.

Detailed Description

Hereinafter, a mode for implementing the safety valve of the present invention will be described based on examples. In addition, the present embodiment is described by taking as an example a safety valve incorporated in a warm water toilet seat cleaning apparatus, but the present invention can also be applied to other applications.

[ example 1 ]

The safety valve of embodiment 1 will be described with reference to fig. 1 to 4. Hereinafter, the left and right sides as viewed from the front side of fig. 1 will be described as the left and right sides of the safety valve. In detail, the right side of the sheet where the main flow path 2 of the warm water toilet seat device is disposed is described as the right side of the safety valve 1, and the left side of the sheet where the discharge flow path 3 is disposed is described as the left side of the safety valve 1.

The safety valve 1 of the present invention is incorporated in, for example, a water supply pipe of a warm water toilet seat cleaning device, and when the fluid pressure in the water supply pipe abnormally increases due to some influence, the fluid is discharged to the outside of the water supply pipe, and the fluid pressure in the water supply pipe is adjusted to be always equal to or lower than a predetermined pressure, thereby protecting the water supply pipe or equipment connected thereto.

As shown in fig. 1, the relief valve 1 mainly includes: a casing 4 that constitutes a part of the main flow path 2 and the discharge flow path 3, which will be described later; a valve seat 5 provided in the housing 4; a valve body 6 housed in an internal space S1 of the case 4 so as to be capable of reciprocating left and right; a passage member 7 fixed to the housing 4 and having a communication passage 71 described later; and a spring 8 as an urging member that urges the valve body 6 toward the valve seat 5.

The housing 4 includes a 1 st housing 41 on the main channel 2 side where the valve seat 5 is formed and a 2 nd housing 42 on the discharge channel 3 side where the passage member 7 is disposed. A stepped recess 41a recessed to the right is formed on the left side of the 1 st case 41, the large diameter portion of the 2 nd case 42 is screwed and fixed to the large diameter portion of the left end of the recess 41a, the intermediate diameter portion of the 2 nd case 42 is disposed in a slightly smaller diameter portion with a packing 9 described later interposed therebetween, and the smallest diameter portion 41b of the right end is formed to extend to the right. Further, the large diameter portion of the 2 nd housing 42 may be fixed to the large diameter portion of the recess 41a by caulking.

A through hole extending through the right and left is formed in the right side of the 1 st casing 41, and the right side of the through hole is the 1 st flow path 21 and the left side thereof is the flow path 23. Further, a 2 nd flow path 22 branched upward is formed at a connecting portion between the 1 st flow path 21 and the flow path 23. The 1 st flow path 21 is connected to the upstream side fluid pipe in the water supply pipe, and the 2 nd flow path 22 is connected to the downstream side fluid pipe in the water supply pipe. That is, the 1 st channel 21, the 2 nd channel 22, and the channel 23 constitute a part of the main channel 2.

The bottom portion provided at the right end of the smallest diameter portion 41b of the recess 41a has a portion that protrudes in a cylindrical shape from the radial center of the bottom portion to the left, the left end of the cylindrical portion serves as the valve seat 5, and the hollow portion of the cylindrical portion serves as the flow path 23 that communicates with the 1 st flow path 21 and the 2 nd flow path 22.

The 2 nd housing 42 has a stepped through hole extending in the left-right direction, and a portion 42a on the right side of the through hole has a larger diameter than the portion 31 on the left side. The left portion 31 of the through hole is connected to a drain pipe communicating with the outside of the water supply pipe, and constitutes a part of the discharge flow path 3. Hereinafter, the right portion 42a of the through hole is referred to as a large diameter portion 42a, and the left portion 31 is referred to as a 3 rd flow path 31.

The internal space S1 of the casing 4 is constituted by the smallest diameter portion 41b of the recess 41a of the 1 st casing 41, the large diameter portion 42a of the 2 nd casing 42, and the gap between the 1 st casing 41 and the 2 nd casing 42 partitioned by the packing 9, and communicates with the main flow path 2 and the discharge flow path 3.

The valve body 6 is mainly composed of a movable member 61 that is movable relative to the housing 4 in the axial direction (specifically, relative to the shaft portion 72 of the passage member 7 in the axial direction), and a seal member 62 that is fixed to the right end portion of the movable member 61. The sealing member 62 is made of an elastic member such as rubber or synthetic resin.

The movable member 61 has a bottom wall portion 61a extending in the radial direction at the right end, a cylindrical outer cylinder portion 61b extending leftward from the outer edge of the bottom wall portion 61a, and a cylindrical inner cylinder portion 61c extending leftward from the center of the bottom wall portion 61 a. The shaft portion 72 of the passage member 7 is inserted into the inner cylindrical portion 61c so as to be relatively slidable in the axial direction. In the valve body 6, on the back side (i.e., the left side) of the sealing member 62 substantially in contact with or separated from the valve seat 5, a partition space S2 separated from the internal space S1 is formed by the bottom wall portion 61a and the inner cylindrical portion 61c of the movable member 61 and the shaft portion 72 of the passage member 7.

The right end of the spring 8 is fitted to the outer end of the inner tube 61c, and the left end of the spring 8 is fitted to the shaft 72 of the passage member 7. Further, the right end of the spring 8 abuts on the left surface of the bottom wall portion 61 a. A projection 61d projecting to the right is formed on the right surface of the bottom wall portion 61a, and the seal member 62 is fixed so as to cover the projection 61 d.

Next, the structure of the passage member 7 will be described with reference to fig. 1 and 2. In addition, fig. 2 shows a state where the passage member 7 is cut at a position partially different from that of fig. 1 in order to easily explain the structure of the passage member 7.

As shown in fig. 1 and 2, the passage member 7 includes a base 73, a small-diameter shaft 72 extending rightward from the base 73, and a bulging portion 74 annularly projecting toward the outer diameter of the base 73. The left end of the base 73 extends into the 3 rd flow channel 31, and the shaft 72 at the right end of the base 73 extends into the inner tube 61 c. The outer peripheral surface of the left end of the base 73 is a tapered portion 73a whose tip is tapered toward the left.

Further, a communication passage 71 extending through the base 73 and the shaft 72 in the left-right direction is formed in the center of the passage member 7, and the communication passage 71 communicates the partitioned space S2 with the 3 rd flow path 31. The "center of the passage member 7" as referred to herein does not necessarily mean the mathematical radial center of the passage member 7, but means a position inside the outer periphery of the bulging portion 74 in the passage member 7.

The left end surface of the bulging portion 74 is fixed to the bottom of the large-diameter portion 42a of the 2 nd housing 42, and notches 74a cut out from the outer diameter side so as to penetrate in the left-right direction are arranged uniformly in the circumferential direction of the bulging portion 74. Further, the left end portion of the spring 8 abuts on the right surface of the bulging portion 74.

The right end of the tapered portion 73a is located on the right side of the left end surface of the bulging portion 74. That is, the throttle portion 75 is formed by the left end portion of the notch portion 74a of the passage member 7 and the inner peripheral surface of the housing 4, and the internal space S1 and the 3 rd flow path 31 are communicated with each other by the throttle portion 75. The cross-sectional area of the throttle portion 75 is formed smaller than the cross-sectional areas of the internal space S1 and the 3 rd flow path 31, which are the flow paths on the upstream side and the downstream side of the throttle portion 75. The throttle portions 75 are disposed uniformly around the communication path 71. The number of the chokes 75 can be changed freely, and may be even or odd, but is preferably arranged uniformly.

As shown in fig. 1 and 2, in the relief valve 1, the valve body 6 is biased by the spring 8 and the seal member 62 is pressed against the valve seat 5 to close the valve at normal times, so that the fluid flowing through the water supply pipe flows from the 1 st flow path 21 to the 2 nd flow path 22 constituting the main flow path 2. In addition, in the closed state of the safety valve 1, air is present in the internal space S1, the divided space S2, and the 3 rd flow path 31 of the case 4. For convenience of explanation, the fluid flowing through the water supply pipe will be described as water, and the fluids in the internal space S1, the partitioned space S2, and the 3 rd flow path 31 will be described as air.

As shown in fig. 3, when the water pressure in the main flow path 2 rises for some reason and exceeds a predetermined value, the valve element 6 moves to the left against the biasing force of the spring 8 due to the water pressure in the main flow path 2, and the relief valve 1 opens. Accordingly, the water in the main flow path 2 passes through the internal space S1 of the housing 4 (specifically, a flow path passing through a gap between the inner peripheral surface of the housing 4 and the outer peripheral surface of the valve element 6 in the internal space S1), and then passes through the notch portion 74a and the throttle portion 75 to be discharged to the 3 rd flow path 31. In the fully open state of the relief valve 1, the left end surface of the valve element 6 abuts against the right surface of the bulging portion 74 of the passage member 7, and the movement of the valve element 6 in the valve opening direction is restricted.

Since the main flow path 2 and the discharge flow path 3 are arranged to face each other linearly in the left-right direction, the water in the main flow path 2 flows in the valve opening direction of the valve body 6 in the internal space S1, and therefore, the loss due to the flow of the water is small, and the movement of the valve body 6 in the valve opening direction is not affected.

When the safety valve 1 is opened, the air in the internal space S1 is pushed out by the water pressure of the main flow path 2, and the air is discharged to the 3 rd flow path 31 through the throttle portion 75. When the air passes through the small-cross-sectional area throttling portion 75, the flow velocity increases, and when the air flows into the 3 rd flow path 31 having a large cross-sectional area, the region in which the fluid flows and the region around the region are relatively made negative pressure, and the air in the partitioned space S2 having a relatively high pressure is discharged to the 3 rd flow path 31 through the communication path 71 due to the negative pressure, whereby the valve body 6 is pulled in the valve opening direction. Thus, at the initial stage of opening the safety valve 1, the valve element 6 is moved greatly in the valve opening direction by the negative pressure generated in the throttle portion 75 in addition to the water pressure of the main flow passage 2, and the valve opening degree can be fully opened, so that the fluid pressure of the main flow passage 2 can be rapidly reduced.

Next, the pressure distribution of the fluid (i.e., air or water) flowing around the throttle portion 75 will be described. As shown in fig. 4, the fluid pressure P1 'in the vicinity of the upstream of the throttle portion 75 is higher than the fluid pressure P1 of the fluid flowing in the internal space S1 (P1' > P1). The fluid pressure P2 immediately behind the throttle section 75 is lower than the fluid pressure P1 (P1 > P2). Further, the fluid pressure P2 'in the vicinity downstream of the throttle portion 75 is lower than the fluid pressure P2 (P2 > P2'). Further, the fluid pressure gradually increases toward a position downstream of the position in the vicinity of the downstream of the throttle portion 75, and stabilizes at a fluid pressure lower than the fluid pressure P1.

In this way, the left end of the communication passage 71 is disposed in the vicinity of the downstream of the throttle section 75 where the negative pressure is the maximum, that is, the absolute pressure is the lowest (fluid pressure P2'), and therefore, the air in the partitioned space S2 is easily introduced into the 3 rd flow passage 31.

Further, when the relief valve 1 is closed, since it takes time for the fluid to be introduced from the discharge flow path 3 into the partitioned space S2, a so-called damping effect is exhibited, and the valve body 6 is smoothly and slowly seated on the valve seat 5.

Further, since the communication path 71 communicating the partitioned space S2 and the discharge flow path 3 extends in the reciprocating direction of the valve body 6, when the valve body 6 moves in the valve opening direction, the air in the partitioned space S2 can be smoothly discharged to the discharge flow path 3 through the communication path 71.

Further, a communication passage 71 is provided at the center of the passage member 7 which is separate from the housing 4, and a tapered portion 73a and a notch portion 74a which constitute a throttle portion 75 are arranged uniformly around the communication passage 71. This enables the communication passage 71, the tapered portion 73a, and the notch portion 74a to be integrally formed with the passage member 7, and therefore the communication passage 71 and the throttle portion 75 can be easily manufactured with high accuracy. Further, since the throttle portions 75 are arranged uniformly, the fluid can be made to flow uniformly.

Further, since the tapered portion 73a constituting the throttle portion 75 is inclined so that the tip thereof becomes narrower toward the left end of the communication passage 71, that is, the end of the communication passage 71 on the discharge passage 3 side, the fluid passing through the throttle portion 75 can be guided to the vicinity of the opening of the left end of the communication passage 71 (specifically, to the region on the slightly left side of the opening of the left end of the communication passage 71 in the 3 rd passage 31), and the air in the partitioned space S2 can be easily introduced into the 3 rd passage 31.

Further, the passage member 7 guides the valve body 6. Specifically, the inner cylindrical portion 61c of the valve body 6 is inserted into the shaft portion 72 of the passage member 7 so as to be slidable relative to each other in the axial direction, and the valve body 6 can be stably reciprocated by the relative sliding between the shaft portion 72 and the inner cylindrical portion 61 c. Since the valve body 6 is thus guided by the passage member 7, a flow path can be formed large between the valve body 6 and the housing 4, and the flow of the fluid can be made smooth and the flow rate can be increased.

Further, since the inner cylinder portion 61c of the valve body 6 is open in the direction in which the fluid flows (i.e., the discharge flow path 3 side), the fluid does not easily flow into the partitioned space S2 by bypassing the gap between the inner cylinder portion 61c and the shaft portion 72, and the fluid pressure in the partitioned space S2 can be maintained in a low state.

Further, since the passage member 7 and the valve body 6 form the partitioned space S2 and the partitioned space S2 can be formed by the passage member 7, it is not necessary to newly prepare a member for forming the partitioned space S2, and the number of members can be reduced to simplify the structure.

The communication path 71 is tapered from the left end toward the right end. Accordingly, since the throttle portion is formed at the position of the communication passage 71 close to the partitioned space S2, when the valve body 6 moves to the left side by the water pressure at the time of valve opening, the air pushed from the partitioned space S2 to the communication passage 71 becomes relatively negative pressure at the left end side of the communication passage 71 by the venturi effect, and the fluid in the partitioned space S2 is easily and efficiently introduced into the discharge passage 3.

The passage member 7 functions as a spring support. Thus, the passage member 7, which is separate from the housing 4, can be positionally adjusted with respect to the housing 4, whereby the spring 8 can be appropriately disposed, and therefore, the safety valve 1 can be easily assembled.

Further, since the left end portion of the spring 8 abuts on the right surface of the bulging portion 74 of the passage member 7 and the spring 8 is disposed apart from the throttle portion 75 on the upstream side, the throttle portion 75 is prevented from being closed by the spring 8 and the flow of the fluid flowing toward the throttle portion 75 is not obstructed.

The passage member 7 functions as a movement restricting portion of the valve body 6 in the valve opening direction. This eliminates the need to provide a movement restricting portion in the housing 4, and thus the structure of the housing 4 can be simplified.

Further, the left end surface of the valve body 6 abuts against the right surface of the expanded portion 74 of the passage member 7, and the movement of the valve body 6 in the valve opening direction is restricted. That is, since the movement of the valve body 6 in the valve opening direction is restricted to a position away from the throttle portion 75 on the upstream side, the throttle portion 75 is prevented from being closed by the valve body 6, and the flow of the fluid flowing toward the throttle portion 75 is not obstructed.

[ example 2 ]

Next, the safety valve of example 2 will be described with reference to fig. 5. Note that, with respect to the same structure as that of the above-described embodiment, redundant structural description is omitted.

As shown in fig. 5, the relief valve 10 of the present embodiment 2 has the same structure as that of the above embodiment 1 except for the structure of the valve body 600 and the passage member 700. The side wall portion 610b of the movable member 610 of the valve body 600 extends leftward from the outer edge of the bottom wall portion 610a at the right end, and the movable member 610 of the valve body 600 has a recess 611 formed therein and opening leftward.

The passage member 700 has an annular plate 760 projecting outward from the right end of the base 730 and a cylindrical portion 770 extending rightward from the outer edge of the annular plate 760, and the shaft portion 72 of example 1 is not provided. In the passage member 700, a recess 780 which is open on the right side is formed by the annular plate 760 and the cylindrical portion 770.

The valve body 600 is inserted into the cylindrical portion 770 disposed in the passage member 700 so as to be slidable in the left-right direction. Between the valve body 600 and the passage member 700, a partitioned space S2 is formed by the recess 611 and the recess 780. Although not shown here, a ring member that allows relative sliding and suppresses entry of fluid is preferably disposed between the outer peripheral surface of the side wall portion 610b and the inner peripheral surface of the cylindrical portion 770.

In this way, the valve body 600 is guided by the cylindrical portion 770 of the passage member 700, so that the reciprocating motion of the valve body 600 is stabilized, and a large flow path can be ensured between the outer peripheral surface of the cylindrical portion 770 and the inner peripheral surface of the housing 4.

Further, since the passage member 700 is fitted to the outer peripheral surface of the valve body 600, the fluid flowing through the internal space S1 bypasses the back surface side of the valve body 600 and does not act in the direction of moving the valve body 600 toward the valve seat 5, and therefore the valve body 600 is easily moved in the valve opening direction.

While the embodiments of the present invention have been described above with reference to the drawings, the specific configurations are not limited to these embodiments, and modifications and additions within the scope not departing from the gist of the present invention are also included in the present invention.

For example, in the above-described examples 1 and 2, the communication path extends in the left-right direction as an example, but the communication path may extend in a curved or meandering manner.

In examples 1 and 2, the communication path has a tapered shape whose tip is tapered toward the partitioned space, but the communication path may extend so as to have a constant cross section in the left-right direction.

In examples 1 and 2, the communication path is provided in the passage member, but may be provided in the housing. Further, a plurality of communication paths may be provided.

In examples 1 and 2, the throttle portion is formed between the passage member and the housing, but may be provided in either the passage member or the housing. In addition, the throttle portions may be arranged unequally. For example, at least 1 throttle portion may be provided.

In embodiments 1 and 2, the discharge flow path side of the throttle portion is inclined toward the center of the passage member, but the discharge flow path side of the throttle portion may be linear in the left-right direction or inclined toward the outer diameter direction, for example, as long as the negative pressure acts on the communication path.

In examples 1 and 2, the divided space is formed by the valve body and the passage member, but a dividing member may be separately prepared and the divided space may be formed by the valve body and the dividing member.

In examples 1 and 2, the embodiment in which the passage member serves as the spring holder of the biasing member is illustrated, but the housing may be a spring holder.

In addition, in the above-described embodiments 1 and 2, the mode in which the passage member serves as the movement restricting portion of the valve body in the valve opening direction is exemplified, but the housing may serve as the movement restricting portion in the valve opening direction.

In embodiments 1 and 2, a coil spring is exemplified as the biasing member, but the biasing member may be modified as long as it can bias the valve body toward the valve seat.

In examples 1 and 2, the case is exemplified as constituting a part of the main flow path and the discharge flow path, but the case may be configured so as to communicate with the main flow path and the discharge flow path, and the case may not be provided with a part of the main flow path and the discharge flow path.

Claims (6)

1. A safety valve, having:

a housing;

a valve seat provided to the housing;

a valve body which is housed in the housing so as to be capable of reciprocating, and which is seated on or separated from the valve seat in accordance with a fluid pressure of a main flow path; and

a biasing member that biases the valve element toward the valve seat,

wherein,

the safety valve has:

a throttle portion that throttles the fluid that has passed between the housing and the valve body and flows toward a discharge flow path; and

and a partition space partitioned on a back surface side of the valve body and communicating with the discharge flow path.

2. The safety valve of claim 1,

the partitioned space and the discharge flow path are communicated by a communication path extending in a reciprocating direction of the valve body.

3. The safety valve of claim 2,

the relief valve includes a passage member that is separate from the housing, the communication passage is provided at the center of the passage member, and the throttle portion is provided on the outer periphery of the passage member.

4. The safety valve of claim 3,

the discharge flow path side of the throttle portion is inclined toward the center of the passage member.

5. The safety valve of claim 3 or 4,

the passage member guides the valve body.

6. The safety valve according to any one of claims 3 to 5,

the passage member and the valve element form the partitioned space.

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