KR102699335B1 - Safety valve with function of rapid releasing abnormal pressure - Google Patents

Abstract

The present invention relates to a safety valve comprising a body (10) whose lower portion is fixedly connected to a storage tank, a bonnet (20) whose lower inner portion is screw-fitted with an upper outer portion of the body (10), a valve seat (30) whose lower outer portion is screw-fitted with a lower inner portion of the body (10), a disc (40) whose lower portion is in close contact with an upper portion of the valve seat (30), a control cap (50) which is screw-fitted with an upper inner portion of the body (10), and a spring (60) whose lower portion is in close contact with an upper surface of the disc (40) and whose upper portion is in close contact with a lower portion of the control cap (50), wherein an annular first chamber (33) having a predetermined depth is formed in an upper central portion of the valve seat (30), an annular first contacting end (35) is formed in an upper inner portion of the valve seat (30), and an annular first exhaust induction end (37) is formed in an upper outer portion of the valve seat (30). The present invention provides a safety valve characterized in that: a protrusion (41) having a predetermined width is formed at a lower edge portion of the disk (40), an annular second chamber (43) having a predetermined depth is provided at a central portion of the protrusion (41) so as to face the first chamber (33) of the valve seat (30), an annular second contact portion (45) is provided at an inner portion of the protrusion (41) so as to come into contact with the first contact portion (35) of the valve seat (30), and an annular second exhaust induction portion (47) is provided at an outer portion of the protrusion (41) so as to face the first exhaust induction portion (37) of the valve seat (30) at a predetermined distance;

Description

Safety valve with function of rapid releasing abnormal pressure

The present invention relates to a safety valve, and more specifically, to a safety valve capable of very quickly removing abnormal pressure generated inside a storage tank by forming a chamber capable of generating positive pressure in each of a disc for opening and closing a flow path and a valve seat.

Tanks storing highly corrosive liquids or gases are equipped with a safety valve to relieve the internal pressure when it rises abnormally. If the internal pressure of the storage tank is below the standard pressure, the safety valve's passage is closed. If the internal pressure of the storage tank exceeds the standard pressure, the safety valve's passage is opened to relieve the excess pressure generated inside the storage tank.

In such a safety valve, the opening and closing of the flow path depends on the relationship between the restoring force of the spring (S) and the gas pressure applied to the lower surface of the disc (20) through the valve seat (30), as shown in Fig. 5. That is, when the force applied to the lower surface of the disc (20) due to an abnormal pressure exceeding a reference value is greater than the restoring force of the spring (S), the disc (20) rises and the flow path opens, and when the abnormal pressure is relieved due to the opening of the flow path, the disc (20) returns to the original position by the restoring force of the spring (S) and the flow path closes.

However, since the opening of the safety valve of this structure is entirely dependent on the gas pressure applied to the lower surface of the disc (20), if an abnormal pressure exceeding the reference value is generated inside the storage tank, there is a limitation in that the abnormal pressure inside the storage tank cannot be quickly relieved unless the gas pressure applied to the lower surface of the disc (20) significantly exceeds the restoring force of the spring (S).

Republic of Korea registered patent no. 1991713 Republic of Korea Patent No. 0781671

The present invention has been proposed to improve the problems of the prior art, and an object of the present invention is to provide a safety valve that can quickly relieve pressure exceeding a standard value when it occurs inside a storage tank.

The present invention, in order to achieve the above object, is a safety valve including a body (10) having a plurality of exhaust holes (11) provided and a lower portion fixedly connected to a storage tank, a bonnet (20) having a lower inner portion screw-fitted with an upper outer portion of the body (10) and connected to the body (10), a valve seat (30) having a lower outer portion screw-fitted with a lower inner portion of the body (10) and connected to the body (10), a disc (40) having a lower portion in close contact with an upper portion of the valve seat (30), a control cap (50) having a lower portion screw-fitted with an upper inner portion of the body (10) located on the upper inside of the bonnet (20) and connected to the body (10), and a spring (60) having a lower portion in close contact with an upper surface of the disc (40) and an upper portion in close contact with a lower portion of the control cap (50), wherein an annular first chamber (33) having a predetermined depth is formed in the upper central portion of the valve seat (30), and The technical features of the present invention are as follows: an annular first contact end (35) is formed on the upper inner portion of the valve seat (30), an annular first exhaust guide end (37) is formed on the upper outer portion of the valve seat (30); a protrusion end (41) having a predetermined width is formed on the lower edge portion of the disk (40), an annular second chamber (43) having a predetermined depth is provided on the central portion of the protrusion end (41) so as to face the first chamber (33) of the valve seat (30), an annular second contact end (45) is provided on the inner portion of the protrusion end (41) so as to face the first contact end (35) of the valve seat (30), and an annular second exhaust guide end (47) is provided on the outer portion of the protrusion end (41) so as to face the first exhaust guide end (37) of the valve seat (30) at a predetermined distance;

An annular first auxiliary chamber (34) having a smaller depth than the first chamber (33) is formed between the first chamber (33) and the first contact end (35) of the valve seat (30), and an annular second auxiliary chamber (44) having a smaller depth than the second chamber (43) is formed between the second chamber (43) and the second contact end (45) of the disk (40) so as to face the first auxiliary chamber (34).

At this time, a third exhaust induction stage (38) is formed between the first chamber (33) and the first auxiliary chamber (34) of the valve seat (30), and a fourth exhaust induction stage (48) is formed between the second chamber (43) and the second auxiliary chamber (44) of the disk (40) and is spaced apart from the third exhaust induction stage (38) of the valve seat (30) and faces it, and the gap between the third exhaust induction stage (38) and the fourth exhaust induction stage (48) can be made smaller than the gap between the first exhaust induction stage (37) and the second exhaust induction stage (47).

The present invention makes it possible to very quickly remove abnormal pressure occurring inside a storage tank by forming a chamber capable of generating positive pressure in each of a disc and a valve seat that opens and closes a flow path.

In addition, the present invention is configured so that an auxiliary chamber can be added, thereby making it possible to more quickly remove abnormal pressure inside a storage tank, and by configuring that a relatively small abnormal pressure can be removed by the operation of the auxiliary chamber itself, the safety of the storage tank can be more reliably ensured.

FIG. 1 is a schematic diagram of a safety valve as an example according to the present invention.
Figure 2 is a schematic cross-sectional configuration diagram of a safety valve as an example according to the present invention.
Figure 3 is a schematic diagram of the configuration of a valve seat and a disc in a safety valve as another example according to the present invention.
Figures 4a to 4c are schematic operation configuration diagrams of a safety valve according to the present invention.
Figure 5 is a schematic diagram of a conventional safety valve.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. In describing the embodiments of the present invention, a detailed description of matters that are not directly related to the technical features of the present invention or are obvious to a person having ordinary skill in the art to which the present invention pertains will be omitted.

The present invention relates to a safety valve with improved operability, and is characterized by comprising a body (10), a bonnet (20), a valve seat (30), a disk (40), a control cap (50), and a spring (60). Each of these components will be examined in detail below.

The body (10) is a part that supports the present invention, and its lower part is fixedly connected to a storage tank that is not shown. An exhaust hole (11) is formed in the body (10), and the exhaust hole (11) is composed of a plurality of exhaust holes arranged radially from the middle part of the body (10).

The bonnet (20) is connected to the body (10) by screwing the inner surface of its lower side with the outer surface of the upper side of the body (10). Accordingly, as shown in FIG. 1 and FIG. 2, the upper part of the body (10) is exposed and positioned in the upper inner space of the bonnet (20).

The valve seat (30) is connected to the body (10) by screwing its lower outer surface portion with the lower inner surface portion of the body (10). As disclosed in the drawing, it is preferable that the exhaust hole (11) formed in the body (10) is located adjacent to the upper portion of the valve seat (30). This is to induce rapid discharge of gas.

At this time, the present invention proposes a configuration in which a first chamber (33), a first contact end (35), and a first exhaust induction end (37) are each formed in the valve seat (30) as shown in Fig. 2. The first chamber (33) is formed in an annular shape with a certain depth along the upper central portion of the valve seat (30). The first contact end (35) is formed in an annular shape along the upper inner portion of the valve seat (30), and the first exhaust induction end (37) is formed in an annular shape along the upper outer portion of the valve seat (30).

The disk (40) is a part that controls the movement of gas through the valve seat (30), and its lower part is in close contact with the upper part of the valve seat (30). At this time, the present invention proposes a configuration in which a protrusion (41), a second chamber (43), a second close contact part (45), and a second exhaust induction part (47) are formed on the disk (40) as shown in Fig. 2, similar to the valve seat (30).

The protrusion (41) is formed protrudingly with a certain width along the lower edge of the disk (40). The second chamber (43) is formed in an annular shape with a certain depth along the central portion of the protrusion (41). The second chamber (43) faces the first chamber (33) of the valve seat (30). Accordingly, a pressure amplification chamber of a certain size in the shape of a ring is formed between the first and second chambers (33, 43).

The second sealing section (45) is formed in a ring shape along the inner portion of the protrusion section (41) and is in close contact with the first sealing section (35) of the valve seat (30). The second exhaust guide section (47) is formed in a ring shape along the outer portion of the protrusion section (41) and is spaced apart from the first exhaust guide section (37) of the valve seat (30) by a fixed interval of △t1 and faces it. Accordingly, when the disk (40) closes the flow path of the valve seat (30), the first and second sealing sections (35, 45) are in close contact with each other, but the first and second exhaust guide sections (37, 47) are not in close contact with each other and maintain a fixed interval.

The reason why the first and second exhaust induction stages (37, 47) are configured to maintain a certain gap when the valve seat (30) is closed is to fundamentally prevent the phenomenon of gas escaping through the disc (40) and valve seat (30) by bringing the first and second sealing stages (35, 45) into close contact with each other when the pressure inside the storage tank is maintained below the reference value.

The control cap (50) is screw-engaged with the upper inner surface of the body (10) and is connected to the body (10). The lower portion of the spring (60) is in close contact with the upper surface of the disk (40), and the upper portion thereof is in close contact with the lower surface of the control cap (50). As shown in Fig. 2, the restoring force of the spring (40) is adjusted according to the degree of engagement between the control cap (50) and the body (10).

The schematic operation of the present invention having such a configuration will be examined with reference to the above-described description and the attached FIGS. 4a to 4c, respectively.

When the pressure inside the unshown storage tank is maintained below the reference value, the total force of the gas acting vertically upward on the lower surface of the disc (40) through the passage of the valve seat (30) is smaller than the total force acting vertically downward on the upper surface of the disc (40) by the spring (60), so that the lower surface of the disc (40) remains in close contact with the upper surface of the valve seat (30) as shown in Fig. 4a. That is, the first and second contact ends (35, 45) are in close contact with each other.

If an abnormal pressure occurs inside the storage tank, the total force of the gas acting vertically upward on the lower surface of the disk (40) becomes greater than the total force acting vertically downward on the upper surface of the disk (40) by the spring (60), and the disk (40) is pushed vertically upward. Accordingly, the first and second contact sections (35, 45) that were in close contact with each other are gradually separated.

When the first and second sealing sections (35, 45) that were in close contact with each other are gradually separated, as shown in Fig. 4b, a portion of the gas filling the passage of the valve seat (30) moves through the gap between the first and second sealing sections (35, 45), fills the space between the first and second chambers (33, 43), and then moves to the space between the first and second exhaust induction sections (37, 47) and then escapes to the outside. The amount of gas that escapes to the outside through the space between the first and second exhaust induction sections (37, 47) is the same as the amount of gas that flows in through the gap between the first and second sealing sections (35, 45).

Meanwhile, when the first and second sealing sections (35, 45) are separated, as shown in FIG. 4b, the cross-sectional area of the space between the first and second chambers (33, 43) is larger than the cross-sectional area of the space between the first and second sealing sections (35, 45). Therefore, when the gas passes through the boundary between the first and second sealing sections (35, 45) and the first and second chambers (33, 43), the dynamic pressure related to the moving speed of the gas decreases, and the static pressure acting vertically on the inner surface of each of the first and second chambers (33, 43) increases. Accordingly, the gas pressure of the storage tank acts on the central portion of the lower surface of the disk (40), and the static pressure acts on the lower edge portion of the disk (40), thereby instantly pushing the disk (40) vertically upward.

When the disc (40) is pushed vertically upward by the pressure of the gas filled in the space between the first and second chambers (33, 43), the gap between the valve seat (30) and the disc (40) is further opened as shown in FIG. 4c, and the gas inside the storage tank is quickly discharged to the outside of the bonnet (20) through the exhaust hole (11), thereby relieving the abnormal pressure. When the abnormal pressure inside the storage tank is relieved, the total combined force acting on the disc (40) is lowered, and accordingly, the disc (40) is lowered by the restoring force of the spring (60) and closes the flow path of the valve seat (30) and returns to the original position as shown in FIG. 4a.

In this way, the present invention configures that when an abnormal pressure occurs inside a storage tank, the high-pressure gas moving between the disk (40) and the valve seat (30) is discharged to the outside, and in addition to the pressure caused by the high-pressure gas, the static pressure generated in the space between the first and second chambers (33, 43) additionally acts on the disk (40), thereby enabling the abnormal pressure inside the storage tank to be relieved very quickly.

Meanwhile, the present invention does not exclude a case where, as disclosed in FIG. 3, a first auxiliary chamber (34) is formed in addition to the first chamber (33) in the valve seat (30), and a second auxiliary chamber (44) is formed in addition to the second chamber (43) in the disk (40).

The first auxiliary chamber (34) is formed in an annular shape between the first chamber (33) and the first contact end (35) of the valve seat (30), and has a characteristic of having a smaller depth than the first chamber (33). The second auxiliary chamber (44) is formed in an annular shape between the second chamber (43) and the second contact end (45) of the disc (40), and has a characteristic of having a smaller depth than the second chamber (43), and the second auxiliary chamber (44) faces the first auxiliary chamber (34).

In this way, by providing the first and second auxiliary chambers (34, 44) that are mutually opposed between the first and second sealing sections (35, 45) and the first and second chambers (33, 43), but forming the space between the first and second auxiliary chambers (34, 44) smaller than the space between the first and second chambers (33, 43), it is possible to relieve the abnormal pressure inside the storage tank more quickly, since the first and second static pressures generated in the process of discharging the gas can be applied to the disk (40). In addition, even if a relatively small abnormal pressure occurs inside the storage tank, the abnormal pressure can be relieved by the operation of the first and second auxiliary chambers (34, 44) themselves.

At this time, as disclosed in the drawing, it is preferable that the spacing △t2 between the third and fourth exhaust induction stages (38, 48) be smaller than the spacing △t1 between the first and second exhaust induction stages (37, 47). This is because the space between the first and second auxiliary chambers (34, 44) is smaller than the space between the first and second chambers (33, 43), so if △t2 < △t1 is configured, the space between the first and second auxiliary chambers (34, 44) can be used as an independent pressure amplification chamber.

Although the above has been described with reference to preferred embodiments of the present invention, these are merely examples, and the present invention is not limited thereto and may be implemented by changing in various ways, and further, it will be obvious that separate technical features may be added and implemented based on the disclosed technical idea.

10: Body 20: Bonnet
30 : Valve seat 40 : Disc
50 : Adjustment cap 60 : Spring

Claims (3)

A safety valve comprising: a body (10) having a plurality of exhaust holes (11) provided and a lower portion fixedly connected to a storage tank; a bonnet (20) having a lower inner portion screw-fitted with an upper outer portion of the body (10) and connected to the body (10); a valve seat (30) having a lower outer portion screw-fitted with a lower inner portion of the body (10) and connected to the body (10); a disc (40) having a lower portion in close contact with an upper portion of the valve seat (30); a control cap (50) having a lower portion screw-fitted with an upper inner portion of the body (10) located on the upper inside of the bonnet (20) and connected to the body (10); and a spring (60) having a lower portion in close contact with an upper surface of the disc (40) and an upper portion in close contact with a lower portion of the control cap (50).
An annular first chamber (33) having a certain depth is formed in the upper central portion of the valve seat (30), an annular first contact end (35) is formed in the upper inner portion of the valve seat (30), and an annular first exhaust induction end (37) is formed in the upper outer portion of the valve seat (30);
A safety valve capable of rapid abnormal pressure relief, characterized in that a protrusion (41) having a predetermined width is formed at a lower edge portion of the disk (40), an annular second chamber (43) having a predetermined depth is provided at a central portion of the protrusion (41) so as to face the first chamber (33) of the valve seat (30), an annular second contact portion (45) is provided at an inner portion of the protrusion (41) so as to come into contact with the first contact portion (35) of the valve seat (30), and an annular second exhaust induction portion (47) is provided at an outer portion of the protrusion (41) so as to face the first exhaust induction portion (37) of the valve seat (30) at a predetermined distance; In the first paragraph,
A safety valve capable of rapid abnormal pressure relief, characterized in that an annular first auxiliary chamber (34) having a smaller depth than the first chamber (33) is formed between the first chamber (33) and the first sealing portion (35) of the valve seat (30), and an annular second auxiliary chamber (44) having a smaller depth than the second chamber (43) is formed between the second chamber (43) and the second sealing portion (45) of the disk (40) and faces the first auxiliary chamber (34). In the second paragraph,
A safety valve capable of rapid abnormal pressure relief, characterized in that a third exhaust induction stage (38) is formed between the first chamber (33) and the first auxiliary chamber (34) of the valve seat (30), and a fourth exhaust induction stage (48) is formed between the second chamber (43) and the second auxiliary chamber (44) of the disk (40) and faces the third exhaust induction stage (38) of the valve seat (30) at a predetermined distance, and the distance between the third exhaust induction stage (38) and the fourth exhaust induction stage (48) is smaller than the distance between the first exhaust induction stage (37) and the second exhaust induction stage (47).

Images