A self-heating aluminum melting furnace

Abstract

This invention discloses a self-heating aluminum melting furnace. The furnace includes a furnace body with a feed inlet. Inside the furnace body are a burner, an aluminum ingot melting platform, and a molten pool. A discharge outlet is located at the bottom of the molten pool. Aluminum ingots are placed on the melting platform through the feed inlet. The high-temperature flue gas generated by the burner melts the aluminum ingots, and the resulting liquid aluminum flows into the molten pool and is then discharged through the discharge outlet. A heat exchange channel connects the burner inside the furnace with the working space of the aluminum ingot melting platform and the molten pool. In actual operation, the operator controls the internal pressure of the furnace to allow the high-temperature flue gas to enter the molten pool from the working space above the aluminum ingot melting platform via the heat exchange channel, and finally exit from below the molten pool. Compared to the traditional method of directly introducing flue gas into the heat storage body, this invention increases the heat exchange process between the flue gas and the molten aluminum, improves the utilization level of waste heat from the flue gas, and reduces the temperature difference within the heat storage body, thus improving the economic efficiency of aluminum ingot melting.

Description

Technical Field

[0001] This invention relates to the field of aluminum melting furnaces, specifically to a self-heating aluminum melting furnace. Background Technology

[0002] Aluminum melting furnaces are mainly used in the metal melting and casting industry. Since their inception, they have been one of the most energy-consuming pieces of equipment in the industry. Therefore, the performance of aluminum melting furnaces directly affects the production efficiency and market competitiveness of enterprises.

[0003] The traditional aluminum melting furnace has the following problems in use: (1) The traditional aluminum melting furnace has problems such as poor heat exchange organization, serious smoke loss, and large natural gas consumption; (2) The heating process is an important direction of the heat utilization process of the aluminum melting furnace. The heating of aluminum ingots and the heating of aluminum liquid in the traditional aluminum melting furnace are two stages of aluminum smelting, which leads to a long production cycle of aluminum ingots. Summary of the Invention

[0004] In view of the defects or deficiencies of the prior art, the purpose of this invention is to provide a self-heating aluminum melting furnace.

[0005] Therefore, the self-heating aluminum melting furnace provided by the present invention includes a furnace body with a feed inlet. The furnace body is equipped with a burner, an aluminum ingot melting platform, and a molten pool. The bottom of the molten pool is equipped with a discharge outlet. The aluminum ingot is placed on the aluminum ingot melting platform through the feed inlet. The burner generates high-temperature flue gas to melt the aluminum ingot. The liquid aluminum flows into the molten pool and is then discharged through the discharge outlet. The furnace body is equipped with a heat exchange channel. The inlet of the heat exchange channel is located in the working space between the burner and the aluminum ingot melting platform inside the furnace body, and a portion of the heat exchange channel and / or the outlet of the heat exchange channel is located inside the molten pool. The heat exchange channel located in the molten pool is equipped with a port for discharging heat and hot flue gas into the molten pool. The heat exchange channel connects the working space between the burner and the aluminum ingot melting platform inside the furnace body and the interior of the molten pool. Through pressure control (such as installing a compressor), the hot flue gas generated by the melting of the aluminum ingot enters the molten pool from the working space through the heat exchange channel and exchanges heat with the liquid aluminum before being discharged from the top of the molten pool.

[0006] Furthermore, the furnace body is provided with at least two aluminum ingot melting platforms, and a burner and a feed inlet are provided above the at least two aluminum ingot melting platforms; two or more of the at least two aluminum ingot melting platforms share a melting pool.

[0007] Furthermore, the working space on the opposite side of any aluminum ingot melting platform is provided with a heat exchange channel inlet, which extends downward into the bottom of the corresponding molten pool and communicates with the heat exchange channel at the bottom of the molten pool.

[0008] Optionally, the heat exchange channels are arranged along the side walls and bottom of the furnace body.

[0009] Optionally, the heat exchange channel extends downwards into the molten pool after passing through the main body of the aluminum ingot melting platform.

[0010] Optionally, the main body of the aluminum ingot melting platform is provided with an aluminum liquid downcomer that connects the platform surface and the molten pool, and the molten liquid aluminum flows into the molten pool through the aluminum liquid downcomer.

[0011] Furthermore, the upper part of the molten pool is provided with a flue gas collection and discharge device for collecting and discharging the hot flue gas in the molten pool.

[0012] Optionally, the flue gas collection and emission device includes a collection and emission cylinder. The end of the collection and emission cylinder located in the molten pool has a flared structure, and the opposite end is provided with a hot flue gas emission port that extends out of the furnace body. The hot flue gas in the molten pool enters the collection and emission cylinder through the flared port and is then discharged from the furnace body.

[0013] Optionally, the flue gas collection and emission device includes a flue gas confluence baffle with several openings. These openings are connected by a flue gas confluence pipe. The hot flue gas in the molten pool flows upward to the flue gas confluence baffle, enters the openings, and is discharged through the flue gas confluence pipe.

[0014] Furthermore, one or both ends of the flue gas manifold extend out of the furnace body, and the hot flue gas is discharged through the port of the hot flue gas manifold.

[0015] Furthermore, the flue gas pipe is connected to heat storage devices at both ends. These heat storage devices store heat and then use it to preheat the air required for the burner to operate.

[0016] Furthermore, a valve is installed on the heat exchange channel. The valve includes a pipe passage with a valve working chamber in the passage. A valve hammer is installed in the working chamber. A suction cup is installed on the valve hammer, and an electromagnetic starter is installed corresponding to the suction cup. When the electromagnetic starter is energized, it generates a suction force on the suction cup, causing the valve hammer to open the pipe passage. When the electromagnetic starter is de-energized, the valve hammer blocks the pipe passage.

[0017] Advantages of this invention:

[0018] (1) The high-temperature flue gas generated by melting aluminum ingots in the aluminum melting furnace of the present invention is passed into the aluminum molten pool to heat the aluminum molten pool and recover the waste heat of the flue gas.

[0019] (2) Furthermore, by setting up multiple aluminum ingot melting platforms (such as two aluminum ingot melting platforms) to work alternately, the high-temperature flue gas generated by the melting of aluminum ingots on one side of the aluminum ingot melting platform can simultaneously heat the aluminum ingots on the other side of the aluminum ingot melting platform, saving the melting time of aluminum ingots and improving the heat utilization level of flue gas; and the flue gas that has been preheated into the aluminum liquid molten pool is passed into the aluminum liquid molten pool to heat the aluminum liquid, recovering the waste heat to a large extent.

[0020] (3) Compared with the traditional method of directly entering the heat storage body, the present invention increases the heat exchange process between the flue gas and the aluminum liquid, improves the heat utilization level of the waste heat of the flue gas, and at the same time reduces the heat exchange temperature difference in the heat storage body, thus improving the economy of aluminum ingot smelting in the aluminum melting furnace. Attached Figure Description

[0021] Figure 1 This is one of the structural reference diagrams of the aluminum melting furnace of the present invention;

[0022] Figure 2 for Figure 1 A side view diagram of the flue gas collection and emission device in an aluminum melting furnace;

[0023] Figure 3 This is a second structural reference diagram of the aluminum melting furnace of the present invention;

[0024] Figure 4 This is the third structural reference diagram of the aluminum melting furnace of the present invention;

[0025] Figure 5 This is a reference schematic diagram of the valve structure of the present invention;

[0026] The symbols in the diagram represent: 1-High-temperature valve one; 2-Vertical heat exchange channel one; 3-Burner one; 4-Inlet one; 5-Inlet two; 6-Burner two; 7-Weighing instrument one; 8-Aluminum ingot; 9-Aluminum ingot melting platform one; 10-Aluminum ingot melting platform two; 11-Weighing instrument two; 12-Flue gas exhaust port one; 13-High-temperature valve two; 14-Melting pool; 15-High-temperature valve three; 16-Flue gas exhaust port two; 17-Vertical heat exchange channel two; 18-Flue gas exhaust port two; 19-Flue gas exhaust port two; 20-Vertical heat exchange channel two; 21-Flue gas exhaust port two; 22-Flue gas exhaust port two; 23-High-temperature valve one; 24-Melting pool; 25-High-temperature valve three; 20-Flue gas exhaust port two; 21-Vertical heat exchange channel two; 22-Flue gas exhaust port two; 23-Flue gas exhaust port two; 24-Melting pool two; 25-High-temperature valve three; 26-Flue gas exhaust port two; 27-Vertical heat exchange channel two; 28-Flue gas exhaust port two; 29-Flue gas exhaust port two; 20-Flue gas exhaust port two; 20-Flue gas exhaust port two; 21-Vertical heat exchange channel two; 22-Flue gas exhaust port two; 23-Flue gas exhaust port two; 24-Flue gas exhaust port two; 25-Flue gas exhaust port two; 26-Flue gas exhaust port two; 27-Vertical heat exchange channel two; 28-Flue gas exhaust port two; 29-Flue gas exhaust port two; 20-Flu 19-Gas manifold vertical pipe; 20-High temperature valve four; 21-Horizontal heat exchange channel; 22-Discharge port; 23-Aluminum liquid discharge valve; 24-Flue gas manifold baffle; 25-Flue gas manifold pipe; 26-Flue gas discharge vertical pipe; 27-Electromagnetic starter; 28-Suction cup; 29-Valve hammer; 30-Valve working chamber; 31-Pipe passage; 32-Flue gas discharge port three; 33-Collection and discharge cylinder; 34-Flanged structure; 35-Aluminum liquid downcomer; 36-Heat exchange channel. Detailed Implementation

[0027] Unless otherwise specified, the following definitions apply to the terminology used in this specification.

[0028] Furthermore, unless otherwise stated, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this valve pertains.

[0029] In case of any discrepancy, this instruction manual and its included definitions shall prevail.

[0030] For the purposes of this invention, the meanings of some terms used in this application are as follows:

[0031] As used herein, the directional terms “upper,” “lower,” “side,” “bottom,” and “opposite side” are consistent with the specific directions shown on the accompanying drawings.

[0032] Furthermore, it should be noted that the pressure control described in this invention can employ methods commonly used in the art. For example, pressure control can be achieved by installing a compressor or other pressurizing device at a suitable location on the heat exchange pipeline, ensuring that the hot flue gas has sufficient pressure to flow into the molten pool.

[0033] Example 1:

[0034] A specific self-heating aluminum melting furnace, reference Figure 1 The left-hand structure includes a furnace body, within which is an aluminum ingot melting platform 9. Above this platform are a feed inlet 4 and a burner 3. A molten pool 14 is located beside the melting platform. Aluminum ingots are placed onto the melting platform through the feed inlet. The heat generated by fuel combustion in the burner melts the ingots, and the liquid aluminum flows into the molten pool, then exits through a discharge port 22 at the bottom of the pool. To improve preheating recovery efficiency, heat exchange channels (2, 20) are provided along the side walls and bottom of the furnace body. The inlet of the heat exchange channel is located in the working space of aluminum ingot melting, that is, the working space between the burner and the aluminum ingot melting platform, or the working space above the aluminum ingot melting platform. A section of the heat exchange channel extends along the side wall of the furnace and is located within the molten pool, specifically at the bottom of the molten pool. One or more hot flue gas outlets are provided on the heat exchange channel at the bottom of the molten pool. The hot flue gas generated by fuel combustion in the burner fills the aforementioned working space, enters the molten pool through the heat exchange channel, exchanges heat with the liquid aluminum in the molten pool, and is then discharged from the top of the molten pool. To ensure effective flue gas discharge from the top of the molten pool, a flue gas collection and emission device is installed above the molten pool.

[0035] Example 2:

[0036] Any structure that can be used for flue gas collection and emission is applicable to this invention. The preferred flue gas collection and emission device in this embodiment is as follows: Figure 1 and 2 As shown, the flue gas collection and emission device installed above the molten pool 14 includes a flue gas manifold baffle 23, which consists of two flat plates in an inverted V shape and is located directly above the horizontal heat exchange channel 20. The connecting shaft of the flue gas manifold baffle 23 is a flue gas manifold pipe 24, which has several collection holes. The flue gas manifold pipe 24 is installed inside the molten pool 14 and is located in the molten aluminum. A flue gas emission port 12 is provided at the end of the flue gas manifold pipe 24. The flue gas manifold pipe 24 can also be configured to discharge flue gas from both ends.

[0037] In a further embodiment, a vertical flue gas discharge pipe 25 is provided on the through hole of the heat exchange channel in the molten pool. Furthermore, a vertical flue gas collection pipe 18 is vertically arranged on each collection hole. The vertical flue gas collection pipe 18 is connected upward to the horizontally distributed flue gas collection pipe 24. The vertical flue gas collection pipe 18 and the flue gas collection pipe 24 are installed inside the molten pool 14 and are both located in the molten aluminum liquid.

[0038] In a further embodiment, a high-temperature valve 23 is also installed on the flue gas manifold horizontal pipe 24. The high-temperature valve 23 is located between the molten pool 14 and the flue gas discharge port 12 and is used to control the flue gas emission.

[0039] Example 3:

[0040] Unlike the embodiments described above, the preferred flue gas collection and emission device in this embodiment is as follows: Figure 3 As shown, the flue gas collection and discharge device above the molten pool includes a collection and discharge cylinder 32 with a flared structure 33 at the bottom, which is used to collect the flue gas discharged from the heat exchange channel in the molten aluminum pool; and then discharge it through the flue gas discharge port 31 located outside the furnace body.

[0041] Example 4:

[0042] In other designs, the aluminum melting furnace has multiple aluminum ingot melting platforms inside, such as two aluminum ingot melting platforms. The space between the two aluminum ingot melting platforms is a molten pool. The two aluminum ingot melting platforms are equipped with corresponding feed inlets and burners. Each aluminum ingot melting platform has a heat exchange channel on its side. The channel inlet is higher than the platform surface to prevent molten aluminum from flowing in. The two inlets extend downward along the inner side wall of the furnace to the bottom of the furnace and then extend into the molten pool to form a heat exchange channel at the bottom of the molten pool. Multiple through holes are opened on the heat exchange channel at the bottom of the molten pool.

[0043] When the aluminum melting furnace is working, the aluminum ingot melting platforms on both sides alternately carry out the aluminum ingot melting work. While the aluminum ingots on one side platform are being melted, aluminum ingots are placed on the other side. In this way, the hot flue gas generated during the aluminum ingot melting process on one side platform is controlled by pressurization and other means to pass through the aluminum ingots on the opposite side platform and enter the heat exchange channel inlet on that side. After entering the molten pool, it exchanges heat with the liquid aluminum in the molten pool and is then collected and discharged from the top of the molten pool.

[0044] In more specific plans, such as Figure 1 As shown, the aluminum melting furnace consists of several parts, including an aluminum ingot feeding system, a combustion system, a melting system, a flue gas circulation system, and a control system.

[0045] The furnace body is equipped with aluminum ingot feed port 1 4, aluminum ingot feed port 2 5, weighing instrument 1 7, weighing instrument 2 11 and other conventional structures for feeding. During normal operation, aluminum ingots 8 are placed on aluminum ingot melting platform 1 9 and aluminum ingot melting platform 2 10 respectively.

[0046] Burner 1 3 and burner 2 6 and their auxiliary working devices are located on the walls on both sides of the aluminum melting furnace, with the installation angle pointing downwards towards aluminum ingot melting platform 1 9 and aluminum ingot melting platform 2 10 respectively;

[0047] Aluminum ingot melting platform 19 and aluminum ingot melting platform 20 are located on both sides of the aluminum melting furnace. The molten pool 14 is located in the middle of the aluminum melting furnace. It is rectangular in shape and is connected to aluminum ingot melting platform 19 and aluminum ingot melting platform 20 on both sides respectively. The aluminum liquid discharge port 21 is located at the bottom of the molten pool 14. There are no specific requirements for the specific installation position. The aluminum liquid discharge valve 22 is installed on the aluminum liquid discharge port 21 to control the discharge of aluminum liquid.

[0048] During operation, aluminum ingot 8 is located on aluminum ingot melting platform 1 9 and aluminum ingot melting platform 2 10 respectively. Under the action of high temperature flame, aluminum ingot 8 begins to melt, and the resulting molten aluminum flows into the molten pool 14. When the molten aluminum in the molten pool 14 is higher than the set height, the molten aluminum discharge valve 22 is opened, and the molten aluminum flows out through the molten aluminum discharge port 21.

[0049] Vertical heat exchange channel 12, vertical heat exchange channel 27, and horizontal heat exchange channel 20 constitute the heat exchange channels of this scheme. The horizontal heat exchange channel 20 passes through the bottom of the molten pool and has multiple through holes. High-temperature valves (1, 19) are installed on the heat exchange channels.

[0050] More specifically, vertical heat exchange channel 12 and vertical heat exchange channel 27 are located on the side of the aluminum ingot melting platform near the furnace wall. Vertical heat exchange channel 12 extends downward through the aluminum ingot melting platform 9, and vertical heat exchange channel 27 extends downward through the aluminum ingot melting platform 10. The lower parts of vertical heat exchange channel 12 and vertical heat exchange channel 27 are respectively connected to the two ends of horizontal heat exchange channel 20, which horizontally passes through the molten pool 14. In order to increase the flue gas pressure, compressors can be installed on vertical heat exchange channel 12 and vertical heat exchange channel 27.

[0051] High-temperature valve 1 and high-temperature valve 4 are located on both sides of the molten pool 14 and installed on the horizontal heat exchange channel 20. The part of the horizontal heat exchange channel 20 located in the molten pool 14 has evenly distributed small holes. The diameter of the small holes is reasonably set so that the pressure in the combustion chamber of the aluminum melting furnace reaches the design value, preventing liquid backflow into the heat exchange channel 20.

[0052] Example 5:

[0053] The aluminum ingot melting platform of this invention is a solid structure or a hollow structure that meets thermodynamic requirements, and further structural references are also available. Figure 4As shown, the main body of the aluminum ingot melting platform is equipped with an aluminum liquid downcomer 34 that connects the platform surface and the molten pool. Liquid aluminum can enter the molten pool through the aluminum liquid downcomer 34. Baffles are provided around the platform to ensure that the filtrate flows into the molten pool through the pipeline, rather than flowing in randomly from all sides.

[0054] Example 6:

[0055] The heat exchange channel in the above embodiments can be adopted as follows: Figure 4 As shown, the heat exchange channel 35 partially passes through the main body of the aluminum ingot melting platform, extends downward in a section near the molten pool, and then extends horizontally into the molten pool. In this way, the heat exchange channel section outside the molten pool is higher than the heat exchange channel section inside the molten pool, which can prevent the liquid aluminum from flowing back.

[0056] In the above embodiments, valves are installed on the passage of the flue gas heat exchange channel and at the outlet of the flue gas collection and emission device. Valves that meet the requirements of high-temperature working environment are all applicable to the present invention.

[0057] Example 6:

[0058] A specific valve structure such as Figure 5 As shown, the temperature valve is composed of an electromagnetic starter 26, a suction cup 27, a valve hammer 28, and a pipe 30. A portion of the pipe 30 protrudes upward to form a valve working chamber 29. The electromagnetic starter 26 is located at the top of the valve working chamber 29, and the lower part of the electromagnetic starter 26 is the valve working chamber 29. The suction cup 27 is located above the valve hammer 28 and is fastened to the valve hammer 28. The suction cup 27 and the valve hammer 28 are installed as a whole in the valve working chamber 29.

[0059] During operation, the two ends of pipe 30 are connected to the heat exchange channel. When the electromagnetic starter 26 is energized, it generates an attractive force that draws the suction cup 27 and the valve hammer 28 upwards, opening pipe 30. During abnormal operation, the electromagnetic starter 26 is de-energized, loses its attractive force, and the suction cup 27 and valve hammer 28 fall under the influence of gravity, blocking the pipe.

[0060] To meet the requirements of high-temperature operation, the suction cup 27 is made of high-temperature resistant material; the valve hammer 28 is solid inside and made of high-density material, such as limestone or stainless steel; the valve working chamber 29 on the pipe is made of high-temperature resistant material.

[0061] In a further embodiment, the hot flue gas discharged from above the molten pool can enter the heat storage chamber. After the heat storage chamber collects heat, it preheats the air required for combustion in the burner, thus recovering waste heat more fully.

[0062] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0063] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0064] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A self-heating aluminum melting furnace, comprising a furnace body, wherein the furnace body is provided with a feed inlet, characterized in that, The furnace body is equipped with a burner, two aluminum ingot melting platforms and a molten pool, with a discharge port at the bottom of the molten pool; the two aluminum ingot melting platforms are equipped with a burner and a feed port above them; the two aluminum ingot melting platforms share a molten pool; Aluminum ingots are placed on the aluminum ingot melting platform through the feed port. The burner generates high-temperature flue gas to melt the aluminum ingots. The liquid aluminum flows into the molten pool and is then discharged through the discharge port. The furnace body is equipped with a heat exchange channel. The inlet of the heat exchange channel is located in the working space between the burner and the aluminum ingot melting platform inside the furnace body, and a section of the heat exchange channel is located inside the molten pool. The heat exchange channel located in the molten pool has an opening for discharging heat and hot flue gas into the molten pool. The working space on the opposite side of any aluminum ingot melting platform is equipped with a heat exchange channel inlet. The heat exchange channel inlet extends downward into the bottom of the molten pool and communicates with the heat exchange channel at the bottom of the molten pool. The heat exchange channel connects the working space between the burner and the aluminum ingot melting platform inside the furnace body and the interior of the molten pool. Through pressure control, the hot flue gas generated during aluminum ingot melting enters the molten pool from the working space through the heat exchange channel and exchanges heat with the liquid aluminum before being discharged from the top of the molten pool. The upper part of the molten pool is equipped with a flue gas collection and discharge device for collecting and discharging hot flue gas from the molten pool; Valves are installed on the heat exchange channel; the hot flue gas generated during the melting process of aluminum ingots on one side of the aluminum ingot melting platform is controlled by pressurization and passes through the aluminum ingots on the other side of the aluminum ingot melting platform and enters the inlet of the heat exchange channel on that side. After entering the molten pool, it exchanges heat with the liquid aluminum in the molten pool and is then collected and discharged from the top of the molten pool.

2. The self-heating aluminum melting furnace as described in claim 1, characterized in that, The heat exchange channels are arranged along the side walls and bottom of the furnace body.

3. The self-heating aluminum melting furnace as described in claim 1, characterized in that, The heat exchange channel passes through the main body of the aluminum ingot melting platform and extends downwards into the molten pool.

4. The self-heating aluminum melting furnace as described in claim 1, characterized in that, The main body of the aluminum ingot melting platform is equipped with an aluminum liquid downcomer that connects the platform surface and the molten pool. The molten liquid aluminum flows into the molten pool through the aluminum liquid downcomer.

5. The self-heating aluminum melting furnace as described in claim 1, characterized in that, The flue gas collection and emission device includes a collection and emission cylinder. The end of the collection and emission cylinder located in the molten pool has a flared structure, and the opposite end is provided with a hot flue gas emission port that extends out of the furnace body. The hot flue gas in the molten pool enters the collection and emission cylinder through the flared port and is then discharged from the furnace body.

6. The self-heating aluminum melting furnace as described in claim 1, characterized in that, The flue gas collection and emission device includes a flue gas confluence baffle with several openings. These openings are connected by a flue gas confluence pipe. The hot flue gas in the molten pool flows upward to the flue gas confluence baffle, enters the openings, and is discharged through the flue gas confluence pipe.

7. The self-heating aluminum melting furnace as described in claim 6, characterized in that, One or both ends of the flue gas manifold extend out of the furnace body, and the hot flue gas is discharged through the port of the hot flue gas manifold.

8. The self-heating aluminum melting furnace as described in claim 6 or 7, characterized in that, The hot flue gas discharged from above the molten pool enters the heat storage device, which stores heat and then uses it to preheat the air required for the burner to operate.

9. The self-heating aluminum melting furnace as described in claim 1, characterized in that, A valve is installed on the heat exchange channel. The valve includes a pipe passage with a valve working chamber. A valve hammer is installed in the working chamber. A suction cup is installed on the valve hammer. An electromagnetic starter is installed corresponding to the suction cup. When the electromagnetic starter is energized, it generates a suction force on the suction cup, causing the valve hammer to open the pipe passage. When the electromagnetic starter is de-energized, the valve hammer blocks the pipe passage.

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