A three-position four-way hand-turn valve

Abstract

A three-position four-way hand-operated valve comprises a valve body, a lower ceramic plate, an upper ceramic plate, a valve cover, a rotating shaft, a valve cover and a handle. The lower ceramic plate is connected to each air port through an air path, and a first connecting airway and a second connecting airway are arranged on the upper part of the upper ceramic plate. The upper ceramic plate is driven to rotate by the handle so that the first connecting airway and the second connecting airway can flow with each air port respectively, thereby, on the one hand, constructing different air passages for the air source inlet, and on the other hand, enabling another air passage to be connected to a fault exhaust port at the same time, so that the atmosphere can be exhausted. When the quick exhaust valve fails or is damaged, a dual exhaust channel is provided, thereby reducing the equipment failure rate and improving safety. The present invention is wear-resistant, high-pressure-resistant, corrosion-resistant, has a small torque and rotation angle, and is leak-free. High-quality tough ceramics are selected, which have a long service life, simple process, low cost, are suitable for mass production, and are easy to promote and use. It is a hand-operated valve with a safety pressure relief port that is easy to switch and control.

Description

Technical Field

[0001] The present invention relates to the field of mechanical valves, and in particular to a three-position four-way manual valve, which enables an air source air inlet to be connected to a switch air channel and has an atmospheric exhaust channel. When a quick exhaust valve fails or is damaged, a dual exhaust channel can be provided, thereby reducing the failure rate of equipment use and improving safety. Background Art

[0002] In the fields of oil refining, chemical industry, electric power, metallurgy, etc., there are working conditions that are not conducive to manual operation, such as flammable and explosive, toxic and harmful, dense pipelines, and high altitude outdoors. Therefore, compressed air is needed to achieve various operations, and the operating reliability, safety, and fault tolerance of the above-mentioned valves have higher requirements.

[0003] Therefore, how to propose a valve that is easy to use, safe and reliable according to the above situation has become a technical problem that urgently needs to be solved in the prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a three-position four-way hand-turned valve. When the handle is moved to the left or right to "open" or "close", the air inlet end of the air source is connected to the "open" air path A end or the "closed" air path B end, and the other way is connected to the fault exhaust port O end, which can exhaust gas to the atmosphere. When the quick exhaust valve fails or is damaged, a dual exhaust channel is provided to reduce the failure rate of equipment use and improve safety.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A three-position four-way hand-operated valve, characterized in that:

[0007] It includes valve body, lower ceramic plate, upper ceramic plate, valve cover, rotating shaft and handle.

[0008] There are four gas paths on the surface of the valve body, and the four gas paths are evenly distributed on the surface of the valve body with a 90-degree interval, wherein the first gas path is located on the left side of the valve body surface and communicates with the "open" gas path A port, the second gas path is located on the right side of the valve body surface and communicates with the "closed" gas path B port, the third gas path is located above the valve body surface and communicates with the air source air inlet P port, and the fourth gas path is located below the valve body surface and communicates with the fault evacuation O port;

[0009] The lower ceramic sheet is located above the valve body and includes a front side and a back side. The back side of the lower ceramic sheet is opposite to the valve body. The lower ceramic sheet has four ventilation holes. The four ventilation holes are respectively opposite to the first to fourth air paths. The lower ceramic sheet and the valve body are fixed to each other.

[0010] The upper ceramic piece is located above the lower ceramic piece, and also includes a front side and a back side. The back side of the upper ceramic piece is opposite to the front side of the lower ceramic piece. The back side of the upper ceramic piece has a first communicating airway and a second communicating airway. The first communicating airway and the second communicating airway are arc-shaped flow guide grooves, wherein the first communicating airway corresponds to the middle part of the third gas path, and has an arc angle of 110 to 120 degrees, and the second communicating airway corresponds to the middle part of the fourth gas path, and has an arc angle of 205 to 215 degrees. A shaft mounting hole is provided in the middle position of the front side of the upper ceramic piece. The rotation of the handle drives the rotation of the shaft to drive the upper ceramic piece to rotate. By combining the upper ceramic piece and the lower ceramic piece, the first communicating airway and the second communicating airway can be connected to different vents respectively, thereby controlling the opening, closing, and stopping of the gas path;

[0011] The valve cover is located above the upper ceramic plate and is installed with the valve body to accommodate and fix the upper ceramic plate and the lower ceramic plate;

[0012] The rotating shaft is installed in the middle of the valve cover, one end of which is installed on the rotating shaft installation hole of the upper ceramic plate, and the other end is installed with a handle;

[0013] The handle is connected to the rotating shaft. The middle position is the "stop" position. The handle is turned 45° to the right to "open", and the handle is turned 45° to the left to "close".

[0014] Optionally, a pressure spring is provided in the valve cover to press against the upper ceramic sheet, thereby fixing the upper and lower ceramic sheets to each other.

[0015] Optionally, the lower ceramic plate and the valve body are fixed to each other specifically as follows: a screw fixing hole is provided in the middle of the valve body, a ceramic plate positioning hole is provided in the middle of the lower ceramic plate, and the ceramic plate positioning hole is opposite to the screw fixing hole, so that the lower ceramic plate and the valve body are relatively fixed by screws.

[0016] Optionally, a sealing ring installation groove is provided on the valve body, surrounding the valve body and the four air passages respectively, and used to accommodate the valve body sealing ring and the four air passage sealing rings, and the lower ceramic plate and the valve body are sealed with a sealing ring.

[0017] Optionally, an anti-twist positioning hole is provided on the reverse side of the lower ceramic plate, and the ceramic plate positioning pin is inserted into the positioning hole to be fixed to the valve body.

[0018] Optionally, the shaft mounting hole of the upper ceramic plate and the first communicating air passage are provided with pressure balancing holes respectively.

[0019] Optionally, there is a gear shifter between the rotating shaft and the valve cover, and the gear shifter includes three grooves corresponding to "open", "close" and "stop" respectively. The gear shifting is achieved by springs pressing the steel balls to stop in different grooves.

[0020] Optionally, the first communicating air passage has an arc angle of 117 degrees, and the second communicating air passage has an arc angle of 208 degrees.

[0021] Optionally, the upper ceramic plate and the lower ceramic plate are made of ceramic material, and the valve body is an integral aluminum alloy casting.

[0022] The present invention has the following advantages:

[0023] 1. When the handle is moved to the left or right to "open" or "close", the P end is connected to the A or B end, and the other end is connected to the O end, which can exhaust the air to the atmosphere. When the quick exhaust valve fails or is damaged, a dual exhaust channel is provided to reduce the failure rate of equipment use and improve safety.

[0024] 2. When the handle is in the middle "stop" position, the P port seal is not connected to other ports, and the A, B, and O terminals are in a conducting state. The atmosphere is vented to prevent damage to the porcelain chip and gas leakage, which may cause malfunction of the equipment and improve safety.

[0025] 3. The rotary valve body air path seal uses two ceramic hard seals. When the P port is ventilated, the pressure between the upper and lower ceramic plates is balanced through the pressure balance port, and the upper ceramic plate is pressed by the spring, so that the precision ceramic plate fits tightly and has good airtightness.

[0026] 4. Gently turn the handle to control opening, stopping and closing, saving time and effort, without the disadvantage of upper seal leakage, long service life. When the hand valve is damaged, all non-working ports are discharged to the atmosphere, which improves the fault tolerance rate, eliminates malfunctions and improves safety. The product production process is mature and simple, suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a front view of a three-position four-way hand-turn valve according to a specific embodiment of the present invention;

[0028] Figure 2 2. It is a right side view of a three-position four-way hand-turn valve according to a specific embodiment of the present invention;

[0029] Figure 3 1 is a top view of a three-position four-way hand-operated valve according to a specific embodiment of the present invention;

[0030] Figure 4 2 is a front view of a valve body of a three-position four-way manual valve according to a specific embodiment of the present invention;

[0031] Figure 5 is a reverse side view of a lower tile according to a specific embodiment of the present invention;

[0032] Figure 6 is a front view of a lower tile according to a specific embodiment of the present invention;

[0033] Figure 7 is a reverse three-dimensional diagram of an upper tile according to a specific embodiment of the present invention;

[0034] Figure 8 is a front view of the reverse side of an upper tile according to a specific embodiment of the present invention;

[0035] Fig. 9 is a front perspective view of an upper tile according to a specific embodiment of the present invention;

[0036] FIG. 10( a ) is a ceramic connection view of a three-position four-way manual valve at a 45-degree open position according to a specific embodiment of the present invention;

[0037] FIG10( b ) is a schematic diagram of the air flow principle of a three-position four-way manual valve at a 45-degree open position according to a specific embodiment of the present invention;

[0038] FIG10( c ) is a front view of a three-position four-way manual valve in a 45-degree open position according to a specific embodiment of the present invention;

[0039] FIG. 11( a ) is a ceramic connection view of a three-position four-way manual valve at a 45-degree closed position according to a specific embodiment of the present invention;

[0040] FIG11( b ) is a schematic diagram of the air flow principle of a three-position four-way manual valve at a 45-degree closed position according to a specific embodiment of the present invention;

[0041] FIG11( c ) is a front view of a three-position four-way manual valve at a 45-degree closed position according to a specific embodiment of the present invention;

[0042] FIG. 12( a ) is a ceramic connection view of the middle stop position of a three-position four-way manual valve according to a specific embodiment of the present invention;

[0043] FIG12( b ) is a schematic diagram of the air flow principle of the middle stop position of the three-position four-way manual valve according to a specific embodiment of the present invention;

[0044] FIG12( c ) is a front view of the middle stop position of the three-position four-way manual valve according to a specific embodiment of the present invention;

[0045] Fig.13 1 is an exploded view of a three-position four-way hand-operated valve according to a specific embodiment of the present invention.

[0046] The technical features indicated by the reference numerals in the figure are:

[0047] 10. Valve body; 20. Lower ceramic tile; 30. Upper ceramic tile; 40. Valve cover; 50. Rotating shaft; 60. Shifter; 70. Handle; 1. First air path; 2. Second air path; 3. Third air path; 4. Fourth air path; 5. Screw fixing hole; 6. Air vent; 7. Ceramic tile fixing hole; 8. Pressure balance hole; 9. First connecting air passage; 10. Second connecting air passage; 11. Rotating shaft mounting hole; 12. Positioning hole; 13. Pressure spring; 14. Valve body sealing ring; 15. Air path sealing ring; 16. Ceramic tile positioning pin. DETAILED DESCRIPTION

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0049] The present invention mainly lies in: using the upper ceramic piece and the lower ceramic piece to construct a gas communication environment. Specifically, the lower ceramic piece is connected to each air port through the gas path, and the upper part of the upper ceramic piece is provided with a first communication airway and a second communication airway. The upper ceramic piece is driven to rotate by the handle, so that the first communication airway and the second communication airway are respectively connected to each air port. Thus, on the one hand, different air passages are constructed for the air source inlet, and on the other hand, another air passage can be connected to the fault exhaust port at the same time to exhaust air to the atmosphere. When the quick exhaust valve fails or is damaged, an additional exhaust channel is provided to form double exhaust, thereby reducing the failure rate of equipment use and improving safety.

[0050] For details, see Figure 1-Figure 9 , respectively showing various views of the three-position four-way hand-turn valve of the present invention,, Fig.13 An exploded view of a three-position four-way hand-operated valve of the present invention is shown.

[0051] A three-position four-way hand-operated valve comprises a valve body 10, a lower ceramic plate 20, an upper ceramic plate 30, a valve cover 40, a rotating shaft 50, and a handle 70.

[0052] There are four gas paths on the surface of the valve body 10, and the four gas paths are evenly distributed on the surface of the valve body 10 with a 90-degree interval, wherein the first gas path 1 is located on the left side of the valve body surface and communicates with the "open" gas path A port, the second gas path 2 is located on the right side of the valve body surface and communicates with the "closed" gas path B port, the third gas path 3 is located above the valve body surface and communicates with the air source air inlet P port, and the fourth gas path 4 is located below the valve body surface and communicates with the fault evacuation O port;

[0053] The lower ceramic 20 is located above the valve body 10 and includes a front side and a back side. The back side of the lower ceramic is opposite to the valve body 10. The lower ceramic has four ventilation holes 6, which are respectively opposite to the first to fourth air paths. The lower ceramic 20 and the valve body 10 are fixed to each other.

[0054] The upper ceramic piece 30 is located above the lower ceramic piece 20, and also includes a front side and a back side. The back side of the upper ceramic piece 30 is opposite to the front side of the lower ceramic piece 20. The back side of the upper ceramic piece 30 has a first connecting air channel 9 and a second connecting air channel 10 with an arc-shaped guide groove, wherein the first connecting air channel 9 corresponds to the middle part of the third air path 3, and has an arc angle of 110 to 120 degrees, and the second connecting air channel 10 corresponds to the middle part of the fourth air path 4, and has an arc angle of 205 to 215 degrees. The first and second connecting air channels can form an air connection channel, and a shaft mounting hole 11 is provided in the middle position of the front side of the upper ceramic piece 30. The rotation of the handle drives the rotating shaft 50 to rotate and drives the upper ceramic piece to rotate. Through the combination of the upper ceramic piece and the lower ceramic piece, the first connecting air channel 9 and the second connecting air channel 10 can be connected to different vents respectively, thereby controlling the opening, closing and stopping of the air path.

[0055] The contact planes of the upper and lower tiles are of high precision and are adjusted to fit tightly under the required pressure resistance, effectively achieving zero leakage.

[0056] The valve cover 40 is located above the upper ceramic plate 30 and is installed with the valve body 10 to accommodate and fix the upper ceramic plate 30 and the lower ceramic plate 20. A pressing spring 13 is provided in the valve cover 40 to press against the upper ceramic plate 30, so that the upper and lower ceramic plates are fixed to each other.

[0057] The rotating shaft 50 is installed in the middle of the valve cover 40, one end of which is installed on the rotating shaft installation hole 11 of the upper ceramic plate, and the other end is installed with a handle 70;

[0058] The handle 70 is connected to the rotating shaft. The middle position is the "stop" position. The handle is turned 45° to the right to be "open", and the handle is turned 45° to the left to be "closed".

[0059] For further information, see Figure 2 , Figure 3 The first gas path 1 and the second gas path 2 extend to the upper side of the valve body 10 to communicate with the "open" gas path A port and the "closed" gas path B port respectively. The third gas path 3 and the fourth gas path 4 extend to the right side of the valve body 10 to communicate with the air source air inlet P port and the fault exhaust O port respectively.

[0060] Referring to Figures 10-12, the working principle of the three-position four-way hand-turn valve in different gears of "open", "close" and "stop" is shown.

[0061] Referring to Figures 10(a)-(c), when the handle is turned 45° to the right to the "open" position, the upper ceramic piece 30 is driven by the handle 70 to rotate 45° counterclockwise. At this time, the first connecting air channel 9 of the upper ceramic piece 30 is opposite to the first air path 1 and the third air path 3, so that the "open" air path A port is connected to the air source air inlet P port, and the air source pressure can be communicated from the P port through the 10mm guide groove of the upper ceramic piece and the A port, and the compressed air flows from the P port to the A port; the second connecting air path 10 is opposite to the second air path 2 and the fourth air path 4, so that the "closed" air path B port is connected to the fault evacuation O port, and the B port is connected to the atmosphere through the 10mm guide groove and the O port, and is evacuated to the atmosphere.

[0062] Referring to Figures 11(a)-(c), when the handle is turned 45° to the left to the "off" position, the upper ceramic piece 30 is driven by the handle 70 to rotate 45° clockwise. At this time, the first connecting air channel 9 of the upper ceramic piece 30 is opposite to the second air path 2 and the third air path 3, so that the "off" air path B port is connected to the air source air inlet P port, and the air source pressure can be connected from the P port through the 10mm guide groove of the upper ceramic piece and the B port; the second connecting air path 10 is opposite to the first air path 1 and the fourth air path 4, so that the "open" air path A port is connected to the fault evacuation O port, and the A port is connected to the atmosphere through the 10mm guide groove and the O port, and is evacuated to the atmosphere.

[0063] Referring to Figures 12(a)-(c), when the handle is in the middle position, the first connecting air channel 9 of the upper ceramic piece 30 is connected to the third air path 3, i.e., the air source air inlet port P, the P port is sealed and not connected to other ports, and the second connecting air path 10 is connected to the first, second and fourth air paths, i.e., the "open" air path A, the "closed" air path B port and the fault exhaust O are connected to the atmosphere through the 10mm guide groove on the upper ceramic piece and exhausted to the atmosphere.

[0064] Furthermore, the lower ceramic plate 20 and the valve body 10 are fixed to each other specifically as follows: a screw fixing hole 5 is provided in the middle of the valve body 10, and a ceramic plate positioning hole 7 is provided in the middle of the lower ceramic plate, and the ceramic plate positioning hole 7 is opposite to the screw fixing hole 5, so that the lower ceramic plate 20 and the valve body 10 are relatively fixed by screws.

[0065] Furthermore, the valve body 10 is provided with a sealing ring installation groove, which surrounds the valve body and the four air passages respectively, and is used to accommodate the valve body sealing ring 14 and the four air passage sealing rings 15. The lower ceramic piece 20 and the valve body 10 are packaged with a sealing ring to ensure that they are closely connected to the valve seat without air leakage or gas bleed.

[0066] Furthermore, an anti-twist positioning hole 12 is provided on the reverse side of the lower ceramic piece 20, which is fixed to the valve body by a ceramic piece positioning pin 16, to ensure that when the upper ceramic piece rotates, the torque will not cause the lower ceramic piece to rotate.

[0067] Furthermore, the shaft mounting hole 11 of the upper ceramic piece 30 and the first connecting air channel 9 are respectively provided with a pressure balancing hole 8. When the first connecting air channel 9 is ventilated with the air inlet P port of the air source through the third air path 3, the pressure between the upper ceramic piece and the lower ceramic piece is balanced through the pressure balancing hole. In this way, the spring presses the upper ceramic piece, so that the precision ceramic piece fits tightly with good air tightness. Otherwise, the pressure on the lower ceramic piece will be too high, and the spring cannot ensure the air tightness between the upper and lower ceramic pieces.

[0068] Furthermore, the upper ceramic plate and the lower ceramic plate are made of ceramic material, and the valve body is an integrated aluminum alloy casting, which ensures the overall strength of the valve body and reduces the weight of the valve body.

[0069] Furthermore, a gear shifter 60 is provided between the rotating shaft 50 and the valve cover 40. The gear shifter 60 includes three corresponding grooves corresponding to "open", "close" and "stop" respectively. The gear shifting is realized by the spring pressing the steel ball to stop in different grooves.

[0070] Further preferably, the first communicating air passage 9 has an arc angle of 117 degrees, and the second communicating air passage 10 has an arc angle of 208 degrees.

[0071] Therefore, the present invention has the following advantages:

[0072] 1. When the handle is moved to the left or right to "open" or "close", the P end is connected to the A or B end, and the other end is connected to the O end, which can exhaust the air to the atmosphere. When the quick exhaust valve fails or is damaged, an additional exhaust channel is provided to form double exhaust, reduce the failure rate of equipment use, and improve safety.

[0073] 2. When the handle is in the middle "stop" position, the P port seal is not connected to other ports, and the A, B, and O terminals are in a conducting state. The atmosphere is vented to prevent damage to the porcelain chip and gas leakage, which may cause malfunction of the equipment and improve safety.

[0074] 3. When the equipment is in the "open", "closed", "stopped" or damaged state, it will not cause pressure buildup or malfunction of the equipment because it can be vented to the atmosphere.

[0075] 4. The rotary valve body air path seal uses two ceramic hard seals. When the P port is ventilated, the pressure between the upper and lower ceramic plates is balanced through the pressure balance port, and the upper ceramic plate is pressed by the spring, so that the precision ceramic plates fit tightly and have good airtightness.

[0076] 5. Gently turn the handle to control opening, stopping and closing, saving time and effort, without the disadvantage of upper seal leakage, long service life. When the hand valve is damaged, all non-working ports are discharged to the atmosphere, which improves the fault tolerance rate, eliminates malfunctions and improves safety. The product production process is mature and simple, suitable for industrial production.

[0077] The invention is wear-resistant, high-pressure-resistant, corrosion-resistant, has small torque and rotation angle, and has no leakage. High-quality tough ceramics are selected, which have long service life, simple process, low cost, suitable for mass production, easy to promote and use, and are easy to switch and control with a safety pressure relief port hand-turn valve.

[0078] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection scope of the present invention determined by the submitted claims.

Claims

1. A three-position four-way hand-operated valve, characterized in that: It includes valve body, lower ceramic plate, upper ceramic plate, valve cover, rotating shaft and handle. There are four gas paths on the surface of the valve body, and the four gas paths are evenly distributed on the surface of the valve body with a 90-degree interval, wherein the first gas path is located on the left side of the valve body surface and communicates with the "open" gas path A port, the second gas path is located on the right side of the valve body surface and communicates with the "closed" gas path B port, the third gas path is located above the valve body surface and communicates with the air source air inlet P port, and the fourth gas path is located below the valve body surface and communicates with the fault evacuation O port; The lower ceramic sheet is located above the valve body and includes a front side and a back side. The back side of the lower ceramic sheet is opposite to the valve body. The lower ceramic sheet has four ventilation holes. The four ventilation holes are respectively opposite to the first to fourth air paths. The lower ceramic sheet and the valve body are fixed to each other. The upper ceramic piece is located above the lower ceramic piece, and also includes a front side and a back side. The back side of the upper ceramic piece is opposite to the front side of the lower ceramic piece. The back side of the upper ceramic piece has a first connecting airway and a second connecting airway. The first connecting airway and the second connecting airway are arc-shaped guide grooves, wherein the first connecting airway corresponds to the middle part of the third gas path, and has an arc angle of 110 to 120 degrees, and the second connecting airway corresponds to the middle part of the fourth gas path, and has an arc angle of 205 to 215 degrees. A shaft mounting hole is provided in the middle position of the front side of the upper ceramic piece. The rotation of the handle drives the rotation of the shaft to drive the upper ceramic piece to rotate. Through the combination of the upper ceramic piece and the lower ceramic piece, the first connecting airway and the second connecting airway can be connected to different gas paths respectively, thereby controlling the opening, closing, and stopping of the gas path; The valve cover is located above the upper ceramic plate and is installed with the valve body to accommodate and fix the upper ceramic plate and the lower ceramic plate; The rotating shaft is installed in the middle of the valve cover, one end of which is installed on the rotating shaft installation hole of the upper ceramic plate, and the other end is installed with a handle; The handle is connected to the shaft. The middle position is the "stop" position. The handle is turned 45° to the right to "open", and the handle is turned 45° to the left to "close"; A pressure spring is provided in the valve cover to press against the upper ceramic plate, so that the upper and lower ceramic plates are fixed to each other, and a pressure balance hole is provided in the shaft mounting hole of the upper ceramic plate and the first communicating air passage respectively; When the handle is turned 45° to the right to the "open" position, the upper ceramic piece is driven by the handle to rotate 45° counterclockwise. At this time, the first connecting air channel of the upper ceramic piece is opposite to the first air path and the third air path, so that the "open" air path A port is connected to the air source air inlet P port, and the air source pressure is connected from the P port through the guide groove of the upper ceramic piece and the A port, and the compressed air flows from the P port to the A port; the second connecting air channel is opposite to the second air path and the fourth air path, so that the "closed" air path B port is connected to the fault evacuation O port, and the B port is connected to the atmosphere through the guide groove and the O port, and evacuates to the atmosphere; When the handle is turned 45° to the left to the "off" position, the upper ceramic piece is driven by the handle to turn 45° clockwise. At this time, the first connecting airway of the upper ceramic piece is opposite to the second and third airways, so that the "off" airway B port is connected to the air source air inlet P port, and the air source pressure is connected from the P port through the guide groove of the upper ceramic piece and the B port; the second connecting airway is opposite to the first and fourth airways, so that the "open" airway A port is connected to the fault evacuation O port, and the A port is connected to the atmosphere through the guide groove and the O port, and evacuates to the atmosphere; When the handle is in the middle position, at this time, the first connecting air channel of the upper ceramic piece is connected to the third air path, i.e., the air source air inlet port P, the P port is sealed and not connected to other ports, and the second connecting air channel is connected to the first, second and fourth air paths, i.e., the "open" air path A port, the "closed" air path B port and the fault evacuation O port are connected to the atmosphere through the guide groove of the upper ceramic piece and evacuated to the atmosphere; The lower ceramic plate and the valve body are fixed to each other specifically as follows: a screw fixing hole is provided in the middle of the valve body, a ceramic plate positioning hole is provided in the middle of the lower ceramic plate, and the ceramic plate positioning hole is opposite to the screw fixing hole, so that the lower ceramic plate and the valve body are fixed by screws.

2. The three-position four-way hand-operated valve according to claim 1, characterized in that: The valve body is provided with sealing ring installation grooves which surround the valve body and four gas paths respectively and are used to accommodate the valve body sealing ring and the four gas path sealing rings. The lower ceramic sheet and the valve body are sealed with sealing rings.

3. The three-position four-way hand-operated valve according to claim 1, characterized in that: The reverse side of the lower ceramic piece is also provided with an anti-twist positioning hole, and the ceramic piece positioning pin is inserted into the positioning hole to be fixed to the valve body.

4. The three-position four-way hand-operated valve according to any one of claims 1 to 3, characterized in that: A gear shifter is provided between the rotating shaft and the valve cover. The gear shifter comprises three grooves corresponding to "open", "close" and "stop" respectively. The gear shifting is realized by springs pressing steel balls to stop in different grooves respectively.

5. The three-position four-way hand-operated valve according to claim 4, characterized in that: The first communicating air passage has an arc angle of 117 degrees, and the second communicating air passage has an arc angle of 208 degrees.

6. The three-position four-way hand-operated valve according to claim 5, characterized in that: The upper ceramic plate and the lower ceramic plate are made of ceramic material, and the valve body is an integrated aluminum alloy casting.

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