All-at-once release valve

Abstract

To provide a deluge valve capable of appropriately exhausting air in any use state of vertical use and horizontal use by preventing mounting error of piping for exhaustion / drainage in a piston chamber in a plant, a construction site, etc.SOLUTION: A deluge valve 1 comprises: a primary chamber 5; a secondary chamber 9; a valve body 11 partitioning the primary chamber 5 and the secondary chamber 9; a piston 17 actuating the valve body 11; and a piston chamber 15 in which the piston 17 is disposed. An air exhaustion mechanism including one exhaust port 29 from which air at a pressurization side of the piston chamber 15 is exhausted is provided, and the air exhaustion mechanism is capable of exhausting the air from the exhaust port 29 in any use state of a vertical use time in which the mechanism is used while being disposed between primary piping 3 and secondary piping 7 disposed in a vertical direction, and a horizontal use time in which the mechanism is used while being disposed between the primary piping 3 and the secondary piping 7 disposed in a horizontal direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a pressurized release type simultaneous release valve that is installed in a piping that supplies fire extinguishing water in a fire extinguishing system. [Background technology]

[0002] As a simultaneous release valve used in fire extinguishing equipment, there is a pressurized release type in which, when pressure is applied to a piston provided at the tip of a piston stem protruding from a valve body, the valve body opens to connect the primary chamber and the secondary chamber. An example of such a pressurized release type simultaneous release valve is disclosed in Patent Document 1.

[0003] As shown in FIG. 1 of Patent Document 1, the "pressurization release valve" of Patent Document 1 pressurizes the lower chamber 4 by flowing high-pressure fire extinguishing water from the primary side flow passage 1a into the lower chamber 4 through the primary pressure inlet hole 6, and this pressure pushes the piston 3 upward to open the main valve 12. If all the air in the pressurized side (lower chamber 4) of the piston chamber is not exhausted during this pressurization (opening operation), the predetermined pressure cannot be obtained due to the action of air expansion and contraction, and the valve body may not open correctly. In this regard, Patent Document 1 exhausts air into the upper chamber 5 through a small hole B provided in the piston 3. An outlet for discharging air from the pressurized side of the piston chamber, such as small hole B, needs to be located at the highest position on the pressurized side of the piston chamber. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 2981864 Summary of the Invention [Problem to be solved by the invention]

[0005] Fig. 1 of the above-mentioned Patent Document 1 shows a state where the device is used by being disposed between pipes arranged horizontally (hereinafter referred to as "horizontal use"), but the arrangement of the pipes is not limited to this state depending on the installation site. For example, when the device is used by being disposed between pipes arranged vertically (hereinafter referred to as "vertical use"), the device needs to be installed in a state rotated 90 degrees from the state shown in Fig. 1 of Patent Document 1. In that case, since small hole B is not at the highest position in lower chamber 4, there is a risk that not all of the air in lower chamber 4 can be exhausted when pressurized, resulting in unstable operation.

[0006] The present invention has been made to solve such problems, and has an object to provide a simultaneous release valve that can discharge all of the air on the pressurized side of the piston chamber in both vertical and horizontal use. [Means for solving the problem]

[0007] (1) The simultaneous release valve of the present invention comprises a primary chamber, a secondary chamber, a valve body separating the primary chamber and the secondary chamber, a piston for actuating the valve body, and a piston chamber in which the piston is disposed, and is further provided with an air exhaust mechanism having one exhaust port for exhausting air on the pressurized side of the piston chamber, and the air exhaust mechanism is configured to be able to exhaust the air from the exhaust port in both states of use, that is, when the air exhaust mechanism is disposed between a primary side piping and a secondary side piping arranged vertically and used, and when the air exhaust mechanism is disposed between a primary side piping and a secondary side piping arranged horizontally and used.

[0008] (2) Also, the simultaneous release valve according to the present invention comprises a primary chamber, a secondary chamber, a valve body separating the primary chamber and the secondary chamber, and a valve operating mechanism for operating the valve body, the valve operating mechanism comprising a piston chamber into which water on the primary side is introduced, a piston movably provided in the piston chamber, a stem interlocking the piston and the valve body, and a lid member having a dome-shaped portion whose surface on the piston chamber side is convex outwardly and covering the pressurized side of the piston chamber, the lid member comprising an exhaust port formed on the outer periphery of the dome-shaped portion for discharging air and water on the pressurized side of the piston chamber, and a valve operating mechanism for operating the exhaust port and the valve body. and a groove-shaped portion that connects the center of the inner surface of the dome-shaped portion, and when used vertically and disposed between a primary side piping and a secondary side piping that are arranged vertically, the exhaust port is located at the highest position of the dome-shaped portion, and when used horizontally and disposed between a primary side piping and a secondary side piping that are arranged horizontally, the groove bottom of the groove-shaped portion is located at the same height as the center of the dome-shaped portion or at a higher position than the center, and the air can be exhausted from the exhaust port in both vertical and horizontal use states.

[0009] (3) In the device described in (1) or (2) above, the piston is provided with an orifice that connects the pressurized side and the other side of the piston chamber. Effect of the Invention

[0010] In the present invention, an air exhaust mechanism having a single exhaust port for exhausting air on the pressurized side of the piston chamber is provided, and the air exhaust mechanism can exhaust air from the piston chamber through the single exhaust port in both vertical and horizontal usage states, thereby achieving stable operation regardless of usage state. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is an explanatory diagram of a simultaneous release valve according to one embodiment of the present invention, showing a cross-sectional view in a horizontal use state. [Diagram 2]2(a) and 2(b) show the external appearance of a simultaneous release valve according to one embodiment of the present invention, in which FIG. 2(a) is a perspective view and FIG. 2(b) is a view taken along the line AA in FIG. 2(a). [Diagram 3] 3A and 3B are explanatory views of a lid member according to an embodiment of the present invention, in which FIG. 3A is a perspective view of the lid member seen from the outside, and FIG. 3B is a perspective view of the lid member seen from the inside. [Figure 4] FIG. 4(a) is a diagram showing only the cover member of the simultaneous release valve shown in FIG. 2(b), and FIG. 4(b) is a diagram showing the back side of the cover member shown in FIG. 4(a). [Diagram 5] FIG. 2 is a cross-sectional view showing an open state of a simultaneous release valve according to an embodiment of the present invention. [Figure 6] FIG. 2 is an explanatory diagram of a simultaneous release valve according to one embodiment of the present invention, showing a cross-sectional view in a vertical use state. [Figure 7] 7A and 7B are explanatory views illustrating another embodiment of the cover member, in which FIG. 7A is a cross-sectional view in a horizontal use state, and FIG. 7B is a cross-sectional view in a vertical use state. [Figure 8] FIG. 1 is an explanatory diagram for explaining how the present invention was arrived at, showing an example of a simultaneous release valve capable of discharging air in both vertical and horizontal use in a vertical use state. [Figure 9] FIG. 9 is a diagram showing the simultaneous release valve shown in FIG. 8 in a horizontal position. [Figure 10] FIG. 11 is an explanatory diagram illustrating another aspect of the simultaneous release valve according to an embodiment of the present invention, showing a cross-sectional view in a horizontal use state with the piston chamber disposed below. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Before describing an embodiment of the present invention, the circumstances by which the inventor arrived at the present invention will be described. In order to solve the above-mentioned problems, a simultaneous release valve 33 as shown in Figs. 8 and 9 can be envisaged as a device that can properly discharge the air on the pressurized side of the piston chamber in both vertical and horizontal use.

[0013] The simultaneous release valve 33 includes a primary chamber 5 communicating with the primary piping 3, a secondary chamber 9 communicating with the secondary piping 7, a valve body 11 separating the primary chamber 5 from the secondary chamber 9, and a valve operating mechanism 13 that operates the valve body 11. 5a and 9a are drain ports for draining the primary and secondary sides of the valve body 11 under normal conditions, but a description thereof will be omitted in this embodiment.

[0014] The valve operating mechanism 13 includes a piston chamber 15 into which water is introduced on the primary side of the valve body 11, a piston 17 movably arranged in the piston chamber 15, a stem 19 that links the piston 17 and the valve body 11, and a lid member 35 that covers the pressurized side of the piston chamber 15.

[0015] The cover member 35 has a dome-shaped portion 23 whose surface on the piston chamber 15 side is convex outward, and an inlet 25 for introducing water from the primary side of the valve body 11 into the piston chamber 15 is provided on the outer periphery of the dome-shaped portion 23. The inlet 25 is connected to the water supply port 5b of the primary chamber 5 via piping 27. In addition, a first outlet 37 and a second outlet 39 for discharging air and water from the piston chamber 15 are formed on the outer periphery and center of the dome-shaped portion 23. The first exhaust port 37 and the second exhaust port 39 are selectively used depending on the operating state of the simultaneous release valve 33. This point will be described in detail below.

[0016] Fig. 8 shows the state of vertical use in which the simultaneous release valve 33 is disposed between the primary side piping 3 and the secondary side piping 7 which are arranged vertically. When the simultaneous release valve 33 is used vertically as shown in Fig. 8, exhaust and drainage are performed from the first exhaust port 37 which is arranged at the highest position of the piston chamber 15. At this time, the second exhaust port 39 is closed.

[0017] When the pump is used horizontally with the simultaneous release valve 33 disposed between the primary piping 3 and secondary piping 7 arranged horizontally, exhaust and drainage are performed through the second exhaust port 39 as shown in Fig. 9. This is because the second exhaust port 39 provided in the center of the dome-shaped section 23 is positioned at the highest position of the piston chamber 15, and therefore all of the air in the piston chamber 15 can be exhausted.

[0018] On the other hand, since the first exhaust port 37 is provided on the outer periphery of the dome-shaped portion 23, in the horizontal use state, the opening of the first exhaust port 37 (part indicated by the dashed circle X in FIG. 9) is located lower than the second exhaust port 39, and it is not possible to exhaust all of the air on the pressurized side of the piston chamber 15. Therefore, in the horizontal use state, the first exhaust port 37 is closed.

[0019] As described above, in the simultaneous release valve 33 shown in Figures 8 and 9, the first exhaust port 37 is positioned at the highest position of the piston chamber 15 when used vertically, and the second exhaust port 39 is positioned at the highest position of the piston chamber 15 when used horizontally. Therefore, by selectively using the first exhaust port 37 or the second exhaust port 39 according to the usage state, air can be appropriately discharged in either the vertical or horizontal usage state.

[0020] As described above, the simultaneous release valve 33 is used by attaching the exhaust / drainage pipe 31 to one of the first exhaust port 37 and the second exhaust port 39 and closing the other port according to the conditions of use at the site, but the installation and closing of the pipe 31 to the first exhaust port 37 and the second exhaust port 39 may be performed in advance at a factory, etc. In that case, product management and process management according to the site are required, and there is a risk of piping errors such as attaching a pipe to a different exhaust port than the one to which it should be attached. In addition, when the pipe 31 is installed at the site, there is a risk that the on-site worker will use the wrong exhaust port. Furthermore, when the first discharge port 37 and the second discharge port 39 have different shapes, it is necessary to prepare pipes 31 corresponding to the respective shapes, which makes product management complicated. In order to solve the above problems, the inventors have intensively studied a method for discharging air from the pressurized side of the piston chamber through a single exhaust port in both vertical and horizontal use, and have arrived at the present invention.

[0021] Fig. 1 is a cross-sectional view of a simultaneous release valve 1 according to an embodiment of the present invention, showing the cross section taken along line BB in Fig. 2(b). In Fig. 1, the same parts as those in Fig. 8 and Fig. 9 are given the same reference numerals. FIG. 2 shows the external appearance of the simultaneous release valve 1, where FIG. 2(a) is a perspective view and FIG. 2(b) is a view taken along the line AA in FIG. 2(a). As shown in Figures 1 and 2, the simultaneous release valve 1 of this embodiment comprises a primary chamber 5 communicating with the primary side piping 3, a secondary chamber 9 communicating with the secondary side piping 7, a valve body 11 separating the primary chamber 5 and the secondary chamber 9, and a valve operating mechanism 13 that operates the valve body 11. The primary chamber 5 and the secondary chamber 9 are provided with drain ports 5a, 9a for draining the primary and secondary sides of the valve body 11. Pipes connected to the drain ports 5a, 9a are not shown.

[0022] The valve operating mechanism 13 comprises a piston chamber 15 into which primary water is introduced, a piston 17 movably arranged in the piston chamber 15, a stem 19 that links the piston 17 with the valve body 11, and a cover member 21 that covers the pressurized side of the piston chamber 15. Lid member 21, which is a characteristic feature of this embodiment, will be described in detail below with reference to FIGS.

[0023] FIG. 3 shows the cover member 21 alone, with FIG. 3(a) being a perspective view seen from the outside, and FIG. 3(b) being a perspective view seen from the inside. FIG. 4(a) shows the cover member 21 in FIG. 2(b) alone, and FIG. 4(b) shows the back side (inside) of the cover member 21 shown in FIG. 4(a).

[0024] As shown in Fig. 3(b), the cover member 21 has a dome-shaped portion 23 whose surface on the piston chamber 15 side is outwardly convex. The reason why a portion of the cover member 21 is dome-shaped in this way is that it has greater strength than a flat disk-shaped portion. If the dome-shaped portion 23 is shaped to be inwardly convex, the center of the dome-shaped portion 23 is likely to interfere with the piston 17, and water may accumulate on the outer surface of the dome-shaped portion 23 during horizontal use, causing corrosion. Therefore, it is preferable that the dome-shaped portion 23 has an outwardly convex shape.

[0025] The cover member 21 is provided with a flange portion 24, and the flange portion 24 is formed with a bolt hole 24a through which a bolt for attaching the flange portion 24 to the simultaneous release valve 1 is inserted.

[0026] 3 and 4, an inlet 25 for introducing water on the primary side of the valve body 11 into the piston chamber 15 is provided on the outer periphery of the dome-shaped portion 23, and is connected to the water supply port 5b of the primary chamber 5, which is the primary side of the valve body 11, via a pipe 27 (see FIG. 1). A pressure regulating valve (not shown) may be provided in the pipe 27.

[0027] Furthermore, an exhaust port 29 is provided on the outer periphery of the dome-shaped portion 23 of the cover member 21 for discharging air and water (fire extinguishing water) from the pressurized side of the piston chamber 15, and the exhaust port 29 is connected to the inlet 9b of the secondary chamber 9 via piping 31. In the above, the air and water on the pressurized side of the piston chamber 15 are discharged to the secondary chamber 9, but the discharge destination is not limited to this, and may be atmospheric exhaust or drainage.

[0028] Further, a groove-shaped portion 23b that connects a center portion 23a of the inner surface of the dome-shaped portion 23 and the discharge port 29 is formed on the inner surface of the dome-shaped portion 23 (see FIG. 3(b) and FIG. 4(b)). The exhaust port 29 and the groove-shaped portion 23b in this embodiment correspond to one of the components of the air exhaust mechanism of the present invention. The groove-shaped portion 23b will be described in detail below with reference to FIG.

[0029] FIG. 1 shows the state in which the simultaneous release valve 1 is disposed between the primary side piping 3 and secondary side piping 7 arranged horizontally and used horizontally, and shows the cross section BB of FIG. 2(b), i.e., the cross section passing through the bottom of the groove-shaped portion 23b. As shown in the enlarged view of FIG. 1, the groove-shaped portion 23b is formed so that, when used horizontally, the groove bottom of the groove-shaped portion 23b is positioned at the same height as the central portion 23a of the dome-shaped portion 23 or at a higher position than the central portion 23a.

[0030] In the simultaneous release valve 33 of Figure 9 described above, when the liquid level of the fire extinguishing water introduced into the piston chamber 15 reaches the portion shown in the dashed circle X in Figure 9, the space inside the dome-shaped portion 23 and the first exhaust port 37 are separated, and the air remaining inside the dome-shaped portion 23 cannot be discharged from the first exhaust port 37. However, in the simultaneous release valve 1 of this embodiment, since the groove-shaped portion 23b is formed, the above-mentioned separation does not occur, and air can be properly discharged from the exhaust port 29 until the pressurized side of the piston chamber 15 is filled with fire extinguishing water.

[0031] Since no air remains in the piston chamber 15 as described above, the simultaneous release valve 1 shown in FIG. 1 can obtain a predetermined pressure when pressurized during horizontal use, and the valve operating mechanism 13 operates reliably to open the valve body 11 (see FIG. 5).

[0032] In addition, in the portion where groove-shaped portion 23b is formed, convex-shaped portion 23c is formed in the corresponding portion on the outside of cover member 23 (see Figs. 3(a) and 4(a)). As a result, as can be seen from the cross section of Fig. 1, the portion where groove-shaped portion 23b is formed has the same thickness as the other portions, and the strength of cover member 23 is about the same as that of conventional cover member 35.

[0033] Next, a case where the simultaneous release valve 1 of the above-mentioned embodiment is used vertically will be described. Fig. 6 is a cross-sectional view of the simultaneous release valve 1 in a vertical use state, disposed between the primary side pipe 3 and the secondary side pipe 7 arranged vertically. As shown in FIG. 6, when the container is used vertically, the outlet 29 is located at the highest position in the dome-shaped portion 23. As a result, when extinguishing water is introduced from inlet 25, the air on the pressurized side of piston chamber 15 can be properly discharged from outlet 29 before the liquid level of the extinguishing water reaches outlet 29. As a result, a predetermined pressure can be obtained when pressurized, just as in the case of horizontal use shown in Figure 1, and valve operating mechanism 13 operates reliably to open valve body 11.

[0034] As described above, in this embodiment, an air exhaust mechanism is provided that is composed of exhaust port 29 provided on the outer periphery of dome-shaped portion 23 of cover member 21 and groove-shaped portion 23b that connects exhaust port 29 and center portion 23a of the inner surface of dome-shaped portion 23, so that air on the pressurized side of piston chamber 15 can be properly exhausted in both vertical and horizontal usage states.

[0035] In addition, since there is only one exhaust port 29 for discharging the air on the pressurized side of the piston chamber 15, there is no risk of incorrect installation of the piping 31 in the factory or on-site, facilitating product management, process management, and on-site construction.

[0036] The present invention is not limited to the above configuration, and various aspects within the scope of the claims are also included in the present invention. For example, in the above embodiment, water on the primary side of the valve body 11 is introduced into the piston chamber 15 from a water supply port 5b provided in the primary chamber 5, but the water supply port 5b may also be provided in the primary side piping 3.

[0037] In addition, the above embodiment is an example of using the lid member 21 in which the exhaust port 29 is formed on the outer periphery of the dome-shaped portion 23, but as another embodiment of the lid member, a lid member 32 as shown in Fig. 7 may be used. The lid member 32 shown in Fig. 7 is provided with the exhaust port 29 on the side surface of the flange portion 24, and a through hole 24b is formed in the flange portion 24 so as to connect the exhaust port 29 and the piston chamber 15. The cover member 32 has a groove-shaped portion 23b that connects the through hole 24b and the central portion 23a of the dome-shaped portion 23, and the groove-shaped portion 23b is formed so that, when used horizontally, the groove bottom of the groove-shaped portion 23b is positioned at the same height as the central portion 23a or at a higher position than the central portion 23a, as shown in Figure 7(a). As shown in FIG. 7(b), when the cover member 32 is used vertically, the outlet 29 is located at the highest position.

[0038] When the lid member 32 configured as described above is used, just as when the lid member 21 having an exhaust port 29 formed on the outer periphery of the dome-shaped portion 23 is used, the air on the pressurized side of the piston can be properly exhausted from the exhaust port 29 in both horizontal and vertical use. However, it is preferable to ensure strength of the portion where the through hole 24b is formed by forming a convex portion on the corresponding outer side of the flange portion 24 so as not to make the portion too thin.

[0039] In addition, as described above, the simultaneous release valve 1 of this embodiment can properly discharge the air in the piston chamber in either the horizontal or vertical use state, but in order to obtain this effect, it must be used in the correct installation state as shown in Figures 1 and 6. However, when used horizontally, it may be difficult to install it as shown in Figure 1 due to reasons such as securing installation space and maintainability.

[0040] For example, in the case of the simultaneous opening valve 1 in Figure 1, the lower end of the stem 19 protrudes from the bottom of the simultaneous opening valve 1 during opening operation (see Figure 5), so it is necessary to secure space below the simultaneous opening valve 1 in which the stem 19 can operate. Furthermore, when performing maintenance on the valve body 11 and its nearby components (such as removing debris), the cover member at the bottom of the main body must be removed to perform the work, so it is also necessary to secure the space necessary to perform such work below the simultaneous release valve 1. However, when the connecting pipe is close to the ground, it is difficult to secure the above-mentioned space.

[0041] In addition, although the valve 11 side is disassembled more frequently for maintenance than the piston chamber 15 side, during maintenance the worker must disassemble and assemble the valve 11 while looking up at the inside of the simultaneous release valve 1 from below, which is not easy to work with. In particular, if the simultaneous release valve 1 is large in size, the valve body 11 is also heavy, making it even more difficult to work from below.

[0042] For the reasons mentioned above, there is a demand for the valve body 11 to be located on the upper side and the piston chamber 15 on the lower side when used horizontally, and another embodiment of the simultaneous release valve 1 which can accommodate such a demand is shown in FIG. 10. Note that Fig. 10 also shows a manual start valve 41, which is not shown in Fig. 1 and other figures. The manual start valve 41 is for an operator who visually confirms a fire to manually start the simultaneous release valve, and by opening the manual start valve 41, water in the primary chamber 5 is introduced from the inlet 25 into the piston chamber 15. Although not shown, a motorized valve is generally provided in parallel with the manual start valve 41. The motorized valve is opened by remote control using a receiving panel that receives a fire signal from a fire detector or the like, and the simultaneous release valve is opened by either manually opening the manual start valve 41 or remotely opening the motorized valve.

[0043] A simultaneous release valve 43 shown in FIG. 10 has the same configuration as the simultaneous release valve 1 described above, and further has an orifice 45 in piston 17 for communicating between the pressurized side and the other side of piston chamber 15. By providing the orifice 45, the simultaneous release valve 43 can exhaust all of the air on the pressurized side of the piston chamber 15 to the other side through the orifice 45 even when used horizontally with the valve body 11 on the upper side and the piston chamber 15 on the lower side as shown in FIG. 10. Furthermore, the simultaneous release valve 43 is an example that can be used in a wider variety of conditions, because it can properly discharge the air on the pressurized side of the piston chamber 15 from the exhaust port 29 of the cover member 21, just like the simultaneous release valve 1, even when used horizontally with the piston chamber 15 on the upper side and the valve body 11 on the lower side as in Figure 1, or when used vertically as in Figure 6. [Explanation of symbols]

[0044] 1. Simultaneous release valve 3 Primary side piping 5 Primary room 5a Drain 5b Water inlet 7 Secondary piping 9 Secondary room 9a Drain 9b Introduction 11 Valve body 13 Valve actuation mechanism 15 Piston chamber 17 Piston 19 Stem 21 Cover member 23 Dome-shaped section 23a Center 23b Groove shape part 23c Convex shape part 24 Flange 24a Bolt hole 24b Through hole 25 Introduction 27 Piping 29 Outlet 31 Piping 32 Lid member (other aspects) 33 Simultaneous release valve (assumed example) 35 Lid member (assumed example) 37 1st outlet 39 2nd outlet 41 Manual start valve 43 Simultaneous release valve (other forms) 45 Orifice

Claims

1. A simultaneous opening valve comprising a primary chamber, a secondary chamber, a valve body separating the primary chamber and the secondary chamber, a piston for actuating the valve body, and a piston chamber in which the piston is disposed, an air exhaust mechanism having one exhaust port for exhausting air on the pressurized side of the piston chamber; The air exhaust mechanism is a simultaneous release valve characterized in that the exhaust port is positioned at the highest position on the pressurized side of the piston chamber so that the air can be exhausted in either vertical use, when it is disposed between a vertically arranged primary side piping and a secondary side piping, or horizontal use, when it is disposed between a horizontally arranged primary side piping and a secondary side piping.

2. a simultaneous release valve comprising a primary chamber, a secondary chamber, a valve body separating the primary chamber and the secondary chamber, and a valve actuation mechanism for actuating the valve body, the valve actuation mechanism comprising a piston chamber into which water on a primary side is introduced, a piston movably provided in the piston chamber, a stem interlocking the piston with the valve body, and a cover member having a dome-shaped portion whose surface on the piston chamber side is convex outward, and covering a pressurized side of the piston chamber, the cover member has an exhaust port formed on an outer periphery of the dome-shaped portion for discharging air and water on the pressurized side of the piston chamber, and a groove-shaped portion connecting the exhaust port and a center of an inner surface of the dome-shaped portion, When the device is used vertically by being disposed between a primary piping and a secondary piping that are arranged vertically, the outlet is disposed at the highest position of the dome-shaped portion, When the pump is used horizontally by being disposed between a primary pipe and a secondary pipe arranged in a horizontal direction, the bottom of the groove-shaped portion is disposed at the same height as the center of the dome-shaped portion or at a higher position than the center of the dome-shaped portion, A simultaneous release valve characterized in that it is configured so that the air can be discharged from the exhaust port in both the vertical and horizontal usage states.

3. 3. The simultaneous release valve according to claim 1, wherein the piston is provided with an orifice that communicates the pressurized side and the other side of the piston chamber.

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