CN110657243A - an automatic drain valve - Google Patents

Abstract

The invention discloses an automatic drain valve, which comprises a valve body (1), a transverse moving mechanism, a longitudinal moving mechanism and a lower end plate (9); the valve body (1) is of a hollow structure with openings at the upper end, the lower end and the left end, the lower end plate (9) is arranged in the valve body (1) and close to an outlet at the lower end of the valve body, and a drainage hole is formed in the center of the lower end plate (9); the transverse moving mechanism penetrates into the valve body (1) from the left end opening of the valve body (1), and can transversely move relative to the valve body (1) along the axis of the left end opening of the valve body (1); the longitudinal moving mechanism is arranged in the valve body (1) and can move longitudinally along the axes of the upper end opening and the lower end opening of the valve body (1) under the action of the transverse moving mechanism. The automatic drain valve does not need to be electrified, has no compressed air loss, has a compact structure and reliable work, and can be used in high-cold environments.

Description

an automatic drain valve

technical field

The invention relates to an air source treatment element, in particular to an automatic drain valve for air source treatment, and belongs to the technical field of pneumatics.

Background technique

The existing automatic drain valve is mainly divided into electromagnetic type and mechanical type according to different driving types. The electromagnetic automatic drain valve relies on electromagnetic drive, and the opening and closing of the drain valve is controlled by the computer to control the gain and loss of electricity of the electromagnetic valve, so as to realize the drainage of the drain valve. The drain valve is controlled by a microcomputer when it drains water. When the microcomputer fails or is powered off, the drain valve cannot be automatically drained. The opening and closing of the drain valve are set by the program. When the drain valve has no water Open, easy to cause the loss of compressed air. The most common type of mechanical automatic drain valve is a floating ball drain valve. When the water reaches a certain water level in the drain valve, the buoyancy of the float ball is greater than the opening pressure of the valve port, and the drain port opens to drain. When the buoyancy of the float ball is smaller than the valve port When the pressure is opened, the drain is closed. Due to the floating ball, the structure has a large volume, and the water accumulated in the drain valve cannot be completely drained. Especially in a high and cold environment, if the water is not drained in time, the water will freeze into ice, which will cause the action of the drain valve to fail. , affecting the drainage of the drain valve. Therefore, it is urgent to design an automatic drain valve that does not require electricity, has no compressed air loss, has a compact structure, is reliable in operation, and can be used in a high and cold environment.

The Chinese utility model patent with the patent number of 201620500946.9 discloses an automatic drain valve, which includes a cylindrical valve body, the upper end of the valve body is the water inlet end, the lower end of the valve body is the water outlet end, and the outside of the valve body is provided with a plurality of and valves. The air inlet hole is connected with the inner cavity. The valve body is provided with an annular sealing groove. The air inlet hole is opened from the outer side wall of the valve body to the lower groove wall of the annular sealing groove. The inner edge of the gasket protrudes out of the annular sealing groove, and the water outlet end of the valve body is provided with a spring. The spring acts on the lower end of the annular sealing gasket and makes the annular sealing gasket located on the upper side of the annular sealing groove. When the valve body enters water, the ring seals The pad moves toward the lower side of the annular sealing groove against the elastic force of the spring and closes the air inlet. This drain valve can realize automatic drainage, but due to its structural characteristics, it is inevitable that there will be a small amount of residue.

SUMMARY OF THE INVENTION

A first aspect of the present invention provides an automatic drain valve, which includes a valve body, and the valve body is equipped with a lateral movement mechanism, a longitudinal movement mechanism and a lower end plate; the lateral movement mechanism and the longitudinal movement mechanism cooperate with each other, and the valve body is The upper end, the lower end and the left end are all open hollow structures, the lower end plate is arranged in the valve body near the outlet of the lower end of the valve body, and the center of the lower end plate has a drainage hole; the lateral movement mechanism is opened from the left end of the valve body Penetrating into the inside of the valve body, the lateral movement mechanism can move laterally relative to the valve body along the axis of the opening at the left end of the valve body; the longitudinal movement mechanism is arranged inside the valve body and can be moved under the action of the lateral movement mechanism Move longitudinally along the opening axis of the upper and lower ends of the valve body.

Preferably, the longitudinal movement mechanism includes a valve core, and the bottom of the valve core also includes a rubber ring; the lower outer side of the valve core is sleeved with a spring I, and the bottom of the valve core has a protruding post, and the protruding post is sleeved on the bottom of the valve core. In the drainage hole of the lower end plate, a hemispherical rubber ring is sleeved on the outer side of the protruding column, and the rubber ring is located between the longitudinal moving mechanism and the lower end plate.

Preferably, the opening of the left end of the valve body is a circular hole, and the lateral movement mechanism includes: a guide rod, a spring II, and a spring seat; the guide rod is laterally installed inside the valve body, and the cross-sectional area of the left side is larger than that of the right side. area, the top of the protruding part on the upper side includes at least one inclined surface, the spring seat is a hollow cylindrical seat with one end open, a predetermined position on the cylindrical outer surface has an annular boss, and the right end of the annular boss of the spring seat is sleeved on the valve In the opening of the left end of the body, a spring II is installed between the spring seat and the guide rod.

More preferably, the upper end opening of the valve body is a circular hole, and the valve core includes a first circular truncated at the bottom, a second circular truncated above the first circular truncated, and a cylinder located above the second circular truncated. The round table and the cylinder are integrally formed, the diameter of the first round table is larger than the diameter of the second round table, the height of the first round table is less than the height of the second round table, the bottom of the first round table has a protruding column, and the middle and lower part of the cylinder has a parallel to the cylinder. The slot in the direction of the bus bar, the slot runs through the cylinder on the left and right, and the top surface of the slot is an arc-shaped surface that protrudes downward. The guide rod of the lateral movement mechanism transversely passes through the slot of the cylinder of the valve core, and the upper protruding part of the guide rod is in contact with the circular arc surface of the slot.

Further, the outer side surface of the integrally formed cylinder and the second circular frustum has a plurality of evenly distributed longitudinal grooves.

Preferably, the upper outer edge of the lower end plate has a concave platform, and a sealing ring III is installed at the concave platform to enhance the sealing performance between the lower end plate and the lower part of the valve body.

Preferably, there is a protruding part inside the valve body for limiting the position of the second circular truncated spool, a spring I is installed under the protruding part, the other end of the spring I is connected to the side surface of the second circular truncated, and the spring I is used for Bring the protruding part of the guide rod into close contact with the grooved arcuate upper surface.

Preferably, a groove is provided at the outlet of the lower part of the valve body, and a circlip is installed in the groove, and the circlip is used to fix the lower end plate in the valve body after it is installed in the valve body.

Preferably, the outer side of the right end of the guide rod of the lateral movement mechanism has a first groove, the first groove is provided with a sealing ring II, the outer side of the left end of the guide rod is provided with a second groove, and the second groove is provided with a sealing ring IV, the sealing ring II and the sealing ring IV are used to enhance the sealing performance between the guide rod and the valve body. The right end of the valve body includes a through hole to facilitate communication with the air.

The working principle of the automatic drain valve provided by the present invention is as follows:

When in use, connect the upper port of the valve body with the drainage port of the pneumatic system through threads, and rely on the sealing ring I for sealing, which can prevent the leakage of the connection between the drainage port of the pneumatic system and the valve body, and the upper port of the valve body and the drainage port of the pneumatic system. Connected, the lower port of the valve body faces downward, when there is no compressed air in the upper port or there is compressed air in the upper port and the guide rod is submerged by water, the guide rod of the lateral movement mechanism relies on the force of the spring II to move along the axis of the opening of the left end of the valve body. Move to the right until the rightmost end of the valve core. At this time, the highest point of the inclined surface of the protruding part on the upper side of the guide rod is in contact with the slotted arc-shaped upper surface of the valve core. The valve core overcomes the force of the spring I and moves upward, so that The rubber ring is separated from the upper surface of the lower end plate, the water in the drain valve flows out from the drainage hole of the lower end plate along the longitudinal groove of the valve core, and the drain valve is in an open state at this time. When there is compressed air in the upper port and the water does not submerge the guide rod, the compressed air is filled into the valve core cavity. Since the cross-sectional area of the left side of the guide rod is larger than that of the right side, under the same pressure of air, the guide rod will The thrust on the left side is greater than the thrust on the right side, and the guide rod moves to the left along the axis of the opening of the left end of the valve body. Move down until the rubber ring is completely in contact with the upper surface of the lower end plate, and the drain valve is closed at this time.

The automatic drain valve of the invention does not need to be electrified, has no loss of compressed air, has a compact structure, is reliable in operation, and can be used in a high and cold environment.

A second aspect of the present invention is to provide an opening and closing method of an automatic drain valve, comprising:

Step a. Connect the upper port of the valve body to the drainage port of the pneumatic system, and the lower port of the valve body is facing down. When there is no compressed air in the upper port or there is compressed air in the upper port and the guide rod 5 is submerged by water, the guide rod of the lateral movement mechanism is moved. 5 Move to the right along the axis of the opening of the left end of the valve body 1 by the force of the spring 12 until the rightmost end of the valve core 1;

Step b. The highest point of the inclined surface of the protruding part on the upper side of the guide rod 5 is in contact with the arc-shaped upper surface 26 of the slot 25 of the valve core 3, so that the valve core 3 overcomes the downward force of the spring 6 and moves upward, Thereby, the rubber ring 7 is separated from the upper surface of the lower end plate 8, and the water in the drain valve flows down along the longitudinal groove 27 of the valve core 3, and then flows out from the drainage hole of the lower end plate 9 to achieve the purpose of drainage. The drain valve is open;

Step c. When there is compressed air in the upper port and the water does not submerge the guide rod 5, the compressed air is filled into the valve core cavity, and the cross-sectional area of the left side of the guide rod 5 is larger than that of the right side. Under the same air pressure, the guide rod 5. The pressure on the left side is greater than the pressure on the right side, so the guide rod 5 moves to the left along the axis of the opening of the left end of the valve body 1;

Step d. The arc-shaped upper surface of the slot 25 of the valve core 3 moves down along the slope of the protruding part on the upper side of the guide rod 5 under the downward elastic force of the spring 6 until the upper surface of the rubber ring 7 and the lower end plate 9 is moved downward. The surface is fully fitted so that the drain valve is closed.

Description of drawings

FIG. 1 is a schematic cross-sectional structure diagram of a preferred embodiment of an automatic drain valve according to the present invention when it is in a drain state;

FIG. 2 is a schematic cross-sectional structure diagram of the embodiment shown in FIG. 1 in a closed state;

FIG. 3 is a schematic three-dimensional structure diagram of the valve core 3 in the embodiment shown in FIG. 1;

FIG. 4 is a schematic structural diagram of another angle of the valve core 3 shown in FIG. 3;

5 is a schematic cross-sectional structural diagram of another preferred embodiment of an automatic drain valve according to the present invention when it is in a closed state;

Fig. 6 is a schematic cross-sectional structure diagram of the embodiment shown in Fig. 5 when it is in an open and draining state:

The meanings of the numbers in Figures 1 to 6 are:

1 valve body 2 sealing ring I 3 valve core 4 sealing ring II 5 guide rod 6 spring I 7 rubber ring 8 sealing ring III 9 lower end plate 10 retaining ring 11 sealing ring IV 12 spring II

13 spring seat 21 first round table 22 second round table 23 cylinder 24 protruding column 25 slot 26 arcuate upper surface 27 longitudinal groove.

Detailed ways

Embodiment 1.1: an automatic drain valve, comprising a valve body 1, a lateral movement mechanism, a longitudinal movement mechanism, and a lower end plate 9; the valve body 1 is a hollow structure with an open upper end, a lower end and a left end, and the lower end plate 9 is arranged on the valve body 1 Close to the outlet of the lower end of the valve body, there is a drain hole in the center of the lower end plate 9; The axis of the opening moves laterally relative to the valve body 1 ; the longitudinal movement mechanism is arranged inside the valve body 1 and can move longitudinally along the opening axes of the upper and lower ends of the valve body 1 under the action of the lateral movement mechanism.

As shown in FIG. 1, the longitudinal movement mechanism includes a valve core 3, a spring I6, and a rubber ring 7; the lower outer side of the valve core 3 is sleeved with a spring I6, and the bottom of the valve core 3 has a protruding column 24, which protrudes The column 24 is sleeved in the drainage hole of the lower end plate 9 , and the outer side of the protruding column 24 is sleeved with a hemispherical rubber ring 7 , and the rubber ring 7 is located between the longitudinal moving mechanism and the lower end plate 9 .

As shown in FIG. 1 , the opening of the left end of the valve body 1 is a circular hole, and the lateral movement mechanism includes: a guide rod 5, a spring II12, and a spring seat 13; the guide rod 5 is laterally installed inside the valve body 1, and its left side The cross-sectional area is larger than the cross-sectional area of the right side, the protruding part on the upper side is an inclined plane, the spring seat 13 is a hollow cylindrical seat with one end open, and there is an annular boss at a predetermined position on the cylindrical outer surface. One end of the side is sleeved in the opening of the left end of the valve body 1 , and a spring II 12 is installed between the spring seat 13 and the guide rod 5 .

As shown in FIG. 1 , the upper end opening of the valve body 1 is a circular hole. As shown in FIG. 3 , the valve core 3 includes a first circular platform 21 located at the bottom, a second circular platform 22 located above the first circular platform 21 , The cylinder 23 located above the second circular platform 22, the first circular platform 21, the second circular platform 22, and the cylinder 23 are integrally formed, the diameter of the first circular platform 21 is larger than the diameter of the second circular platform 22, and the height of the first circular platform 21 is the second circular platform 22. 1/4 of the height of the first round table 21 has a protruding column 24 at the bottom, the middle and lower part of the column 23 has a slot 25 perpendicular to the axis direction of the column 23, the slot 25 penetrates the column 23 left and right, and the slot 25 is The upper surface is an arcuate upper surface 26 protruding downward. As shown in FIGS. 1 and 2 , the guide rod 5 of the lateral movement mechanism transversely passes through the slot 25 of the cylinder 23 of the valve core 3 . 26 contact each other. The protruding part on the upper side includes two inclined surfaces, and the apexes of the two inclined surfaces are located at the lower center of the arcuate upper surface 26 when the water is drained.

Further, as shown in FIG. 4 , the outer side surfaces of the cylindrical 23 and the second circular truncated 22 formed as a whole have a plurality of longitudinal grooves 27 evenly distributed.

Preferably, the upper outer edge of the lower end plate 9 has a concave platform, and a sealing ring III 8 is installed at the concave platform to enhance the sealing performance between the lower end plate 9 and the lower part of the valve body 1 .

Preferably, the valve body 1 has a protruding part inside the valve core 3 for limiting the position of the second circular cone 22, a spring I6 is installed under the protruding part, and the other end of the spring I6 is connected to the second circular cone 22. On the side, the spring I6 is used to closely contact the protruding part of the guide rod 5 with the arcuate upper surface 26 of the slot 25 .

Preferably, a groove is provided at the outlet of the lower part of the valve body 1 , and a retaining spring 10 is installed in the groove. The retaining spring 10 is used to fix the lower end plate 9 in the valve body 1 after it is installed in the valve body 1 .

Preferably, a first groove is provided on the outer side of the right end of the guide rod 5 of the lateral movement mechanism, and a sealing ring II 4 is provided in the first groove, and a second groove is provided on the outer side of the left end of the guide rod 5, and the second groove is provided in the second groove. There is a sealing ring IV 11. The sealing ring II 4 and the sealing ring IV 11 are used to enhance the sealing performance between the guide rod 5 and the valve body 1. The right end of the valve body 1 includes a through hole for easy communication with air.

The working principle of the automatic drain valve provided by the present invention is as follows:

When in use, the upper port of the valve body 1 is connected with the drainage port of the pneumatic system through threads, and the sealing ring I 2 is used for sealing, which can prevent the leakage of the connection between the drainage port of the pneumatic system and the valve body 1. As shown in Figure 1, the valve The upper port of the body 1 is connected to the drainage port of the pneumatic system, and the lower port of the valve body 1 faces downward. When there is no compressed air in the upper port or there is compressed air in the upper port and the guide rod 5 is submerged by water, the guide rod 5 of the lateral movement mechanism relies on the spring The force of II 12 moves to the right along the axis of the opening of the left end of the valve body 1 until the rightmost end of the valve core 1. At this time, the highest point of the inclined surface of the protruding part on the upper side of the guide rod 5 and the circle of the slot 25 of the valve core 3 The arc-shaped upper surface 26 is in contact, and the valve core 3 moves up against the force of the spring I6, so that the rubber ring 7 is separated from the upper surface of the lower end plate 8, and the water in the drain valve runs along the longitudinal groove 27 of the valve core 3 from the lower end. The water flows out from the drain hole of the plate 9, and the drain valve is in an open state at this time. As shown in Figure 2, when there is compressed air in the upper port and the water does not submerge the guide rod 5, the compressed air is filled into the valve core cavity. Since the cross-sectional area of the left side of the guide rod 5 is larger than that of the right side, at the same Under the action of the air pressure, the pressure on the left side of the guide rod 5 is greater than the pressure on the right side, the guide rod 5 moves to the left along the axis of the opening of the left end of the valve body 1, and the arc-shaped upper surface 26 of the slot 25 of the valve core 3 is at the left side. Under the action of the spring I6, it moves downward along the inclined surface of the protruding part on the upper side of the guide rod 5 until the rubber ring 7 is in complete contact with the upper surface of the lower end plate 9, and the drain valve is in a closed state at this time.

Embodiment 1.2: An automatic drain valve, the same as Embodiment 1.1, the difference is that, as shown in Figure 5 and Figure 6, the outer side wall of the upper end opening of the valve body 1 is tapered, and the outer side wall of the cone is connected to the pneumatic system. When the drain outlet is connected, it can be tightly connected, and a good sealing effect can be achieved without the sealing ring I.

Embodiment 2.1: a kind of opening and closing method of automatic drain valve, it comprises:

Step a. Connect the upper port of the valve body to the drainage port of the pneumatic system, and the lower port of the valve body is facing down. When there is no compressed air in the upper port or there is compressed air in the upper port and the guide rod 5 is submerged by water, the guide rod of the lateral movement mechanism is moved. 5 Move to the right along the axis of the opening of the left end of the valve body 1 by the force of the spring 12 until the rightmost end of the valve core 1;

Step b. The highest point of the inclined surface of the protruding part on the upper side of the guide rod 5 is in contact with the arc-shaped upper surface 26 of the slot 25 of the valve core 3, so that the valve core 3 overcomes the downward force of the spring 6 and moves upward, Thereby, the rubber ring 7 is separated from the upper surface of the lower end plate 8, and the water in the drain valve flows down along the longitudinal groove 27 of the valve core 3, and then flows out from the drainage hole of the lower end plate 9 to achieve the purpose of drainage. The drain valve is open;

Step c. When there is compressed air in the upper port and the water does not submerge the guide rod 5, the compressed air is filled into the valve core cavity, and the cross-sectional area of the left side of the guide rod 5 is larger than that of the right side. Under the same air pressure, the guide rod 5. The pressure on the left side is greater than the pressure on the right side, so the guide rod 5 moves to the left along the axis of the opening of the left end of the valve body 1;

Step d. The arc-shaped upper surface of the slot 25 of the valve core 3 moves down along the slope of the protruding part on the upper side of the guide rod 5 under the downward elastic force of the spring 6 until the upper surface of the rubber ring 7 and the lower end plate 9 is moved downward. The surface is fully fitted so that the drain valve is closed. Perform steps a and b in sequence to open the drain valve, or perform steps c and d in sequence to close the drain valve.

Compared with the automatic drain valve in the prior art, the above-mentioned embodiment has the following outstanding advantages and effects:

(1) The upper port of the valve body 1 is connected with the drainage port of the pneumatic system through threads, and is sealed by the sealing ring I2, which can prevent the leakage of the connection between the drainage port of the pneumatic system and the valve body 1, and has a good sealing effect;

(2) The sealing ring II 4 and the sealing ring IV 11 installed in the grooves at the left and right ends of the guide rod 5 can prevent the leakage of compressed air in the cavity of the valve body 1, and have a good sealing effect;

(3) The small holes on the left end face of the spring seat 13 and the right end face of the valve body 1 communicate with the atmosphere, so that the guide rod 5 can move left and right more smoothly;

(4) The automatic drain valve can automatically drain water when there is no compressed air or when the guide rod 5 is full of water, which can prevent the water from forming ice cubes in a high and cold environment, causing the drain valve to burst or fail to drain.

(5) The automatic drain valve has no electric control and floating ball structure, and has the advantages of compact structure and reliable operation.

Claims (10)

1. An automatic drain valve, comprising a valve body (1), a lateral movement mechanism, a longitudinal movement mechanism, and a lower end plate (9); the valve body (1) is a hollow structure with an open upper end, a lower end and a left end, and is characterized in that: The lower end plate (9) is arranged in the valve body (1) near the outlet of the lower end of the valve body, and the center of the lower end plate (9) is provided with a drain hole; the lateral movement mechanism penetrates into the valve body from the left end opening of the valve body (1). Inside (1), the lateral movement mechanism can move laterally relative to the valve body (1) along the axis of the opening at the left end of the valve body (1); the longitudinal movement mechanism is arranged inside the valve body (1) and can be Under the action of the lateral movement mechanism, the inside longitudinally moves along the opening axes of the upper and lower ends of the valve body (1). 2. The automatic drain valve according to claim 1, characterized in that: the longitudinal movement mechanism comprises a valve core (3), a spring I (6), a rubber ring (7); the lower outer side of the valve core (3) is sleeved Spring I (6), the bottom of the valve core (3) has a protruding post (24), the protruding post (24) is sleeved in the drainage hole of the lower end plate (9), and the outer side of the protruding post (24) is sleeved with Rubber ring (7). 3. The automatic drain valve according to claim 1, characterized in that: the lateral movement mechanism comprises a guide rod (5), a spring II (12), and a spring seat (13); the guide rod (5) is laterally installed on the valve Inside the body (1), the cross-sectional area on the left side is larger than the cross-sectional area on the right side, the protruding part on the upper side is an inclined plane, the spring seat (13) is a hollow cylindrical seat with one end open, and a predetermined position on the cylindrical outer surface has a An annular boss, the right end of the annular boss of the spring seat (13) is sleeved in the left end opening of the valve body (1), and a spring II (12) is installed between the spring seat (13) and the guide rod (5). 4. The automatic drain valve according to any one of claims 1-3, characterized in that: the valve core (3) comprises a first circular platform (21) located at the bottom, a first circular platform (21) located above the first circular platform (21) Two circular platforms (22) and a cylinder (23) located above the second circular platform (22), the diameter of the first circular platform (21) is larger than the diameter of the second circular platform (22), and the height of the first circular platform (21) is smaller than that of the second circular platform (21). (22) height, the bottom of the first circular table (21) has a protruding column (24), the middle and lower part of the column (23) has a slot (25) perpendicular to the axis direction of the cylinder (23), the slot ( 25) Left and right penetrating cylinders (23), and the upper surface of the slot (25) is an arcuate upper surface (26) protruding downward. 5. The automatic drain valve according to claim 4, characterized in that: the guide rod (5) of the lateral movement mechanism transversely passes through the slot (25) of the cylinder (23) of the valve core (3), and the guide rod The upper side of (5) has a protruding portion which is in contact with the arcuate upper surface (26) of the slot (25). 6. The automatic drain valve according to claim 5, characterized in that: the outer side surfaces of the cylinder (23) and the second circular frustum (22) have a plurality of longitudinal grooves (27) evenly distributed. 7. The automatic drain valve according to claim 6, characterized in that: the upper outer edge of the lower end plate (9) has a concave platform, and a sealing ring III (8) is installed at the concave platform to strengthen the lower end plate (9) and the lower part of the valve body (1). 8. The automatic drain valve according to any one of claims 1-3 or 5-7, characterized in that: the inside of the valve body (1) has a second circular truncated (22) for aligning the valve core (3). The protruding part for limiting the position, a spring I (6) is installed below the protruding part, the other end of the spring I (6) is connected to the side surface of the second round table (22), and the spring I (6) is used for the guide rod (5). ) is in close contact with the arcuate upper surface (26) of the slot (25). 9. The automatic drain valve according to claim 8, characterized in that: a groove is provided at the lower outlet of the valve body (1), a circlip (10) is installed in the groove, and the circlip (10) is used for After the lower end plate (9) is installed in the valve body (1), it is fixed in the valve body (1). 10. A method for opening and closing an automatic drain valve, characterized in that: comprising: Step a. Connect the upper port of the valve body to the drainage port of the pneumatic system, and the lower port of the valve body is facing down. When there is no compressed air in the upper port or there is compressed air in the upper port and the guide rod 5 is submerged by water, the guide rod of the lateral movement mechanism is moved. 5 Move to the right along the axis of the opening of the left end of the valve body 1 by the force of the spring 12 until the rightmost end of the valve core 1; Step b. The highest point of the inclined surface of the protruding part on the upper side of the guide rod 5 is in contact with the arc-shaped upper surface 26 of the slot 25 of the valve core 3, so that the valve core 3 overcomes the downward force of the spring 6 and moves upward, Thereby, the rubber ring 7 is separated from the upper surface of the lower end plate 8, and the water in the drain valve flows down along the longitudinal groove 27 of the valve core 3, and then flows out from the drainage hole of the lower end plate 9 to achieve the purpose of drainage. the valve is open; Step c. When there is compressed air in the upper port and the water does not submerge the guide rod 5, the compressed air is filled into the valve core cavity, and the cross-sectional area of the left side of the guide rod 5 is larger than that of the right side. Under the same air pressure, the guide rod 5. The pressure on the left side is greater than the pressure on the right side, so the guide rod 5 moves to the left along the axis of the opening of the left end of the valve body 1; Step d. The arc-shaped upper surface of the slot 25 of the valve core 3 moves down along the slope of the protruding part on the upper side of the guide rod 5 under the downward elastic force of the spring 6 until the upper surface of the rubber ring 7 and the lower end plate 9 is moved downward. The surface is fully fitted so that the drain valve is closed; Steps a and b are performed in sequence to open the drain valve, or steps c and d are performed in sequence to close the drain valve, or steps a, b, c, and d are sequentially performed to drain the water before closing the drain valve.

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