CN212480323U - High liquid level control valve with test function - Google Patents

Abstract

The utility model provides a high liquid level control valve with test function, which can be directly connected with an air source and has high sensitivity, wherein the valve body is provided with an air inlet, an air outlet and a working port which are communicated with the valve cavity, the buoy is connected with a valve core assembly in the valve cavity through a mandril, a test unit is arranged below the buoy, the test unit comprises a shell body which is internally provided with an air cavity, the lower end of the plunger is abutted against the bottom of the air cavity in a natural state, and the upper end of the top sleeve is abutted against the lower end of the buoy; when the self-testing port ventilates the air cavity, the air pressure drives the plunger piston to drive the jacking sleeve to move upwards, and the elastic force of the second spring simulates the buoyancy force of the buoy to drive the buoy to move upwards. When a test is needed, the test port can be directly connected to an air source on the tank type oil truck, the elasticity of the second spring simulates the buoyancy of the float to drive the float, if the float fails to drive the valve core assembly to act, the closing of the oil filling bottom valve cannot be controlled, and the failure of the high liquid level control valve is proved, so that the maintenance is needed; otherwise, the performance of the high liquid level control valve is normal.

Description

High liquid level control valve with test function

Technical Field

The utility model relates to a tank-type tank truck technical field, concretely relates to take test function's high liquid level control valve.

Background

The tank type oil truck is a common oil filling and transporting device, the principle is as shown in figure 1, when an external device fills oil into an oil tank 1, in order to prevent potential safety hazards caused by excessive overflow of the oil filled in the oil tank 1, a high liquid level valve 2 is arranged at the top of the oil tank 1, and the opening and closing of an oil filling bottom valve 3 are directly controlled. One side of the high liquid level valve 2 is provided with an air inlet communicated with an air source, the other side of the high liquid level valve is provided with a working port communicated with the oil filling bottom valve 3, a floating barrel connected with a valve core is arranged in the valve cavity, when the floating barrel is in a sinking position (when the liquid level of fuel oil in the oil tank is lower than a set highest liquid level), the valve core enables the air inlet to be opened and an air outlet to be closed, the air inlet is communicated with the working port, at the moment, compressed air comes out of the working port, the oil filling bottom valve 3 is opened under the action of air pressure, and external equipment is allowed to fill oil into the oil tank; when the fuel in the oil tank 1 reaches the set highest liquid level, the high liquid level valve 2 floats due to the float bowl, the valve core is in a state that the air inlet is closed and the working port exhausts, the oil filling bottom valve 3 automatically closes along with the pressure loss, and the oil filling operation stops. The control level performance of the high level valve 2 determines not only whether the oil filling operation is normally performed but also the safety of the oil filling operation, and therefore, it is necessary to periodically check the function of the high level valve, and for safety, it is desirable to perform a check test in a state where the oil tank 1 is not filled with oil.

In order to solve the above problems, a utility model named "a self-checking type magnetic control liquid level valve" (grant publication number CN209606855U) discloses the following technical solutions: including the air chamber casing, the gas cap room of seting up the gas chamber, fixed connection is in the piston barrel subassembly of air chamber casing below, set up the magnetic control switch subassembly in the gas chamber and set up in the inside flotation pontoon subassembly of floating connection in the air chamber casing below of piston barrel subassembly, still include self-checking device, self-checking device includes the cylinder, and the piston rod of cylinder stretches into in the piston barrel subassembly to contradict on the flotation pontoon subassembly, promote the flotation pontoon upward movement through the cylinder. In the above-mentioned scheme, utilize the cylinder to promote the flotation pontoon upward movement, when the cylinder inserts on-vehicle air supply, the top thrust of cylinder is greater than the buoyancy that the flotation pontoon rose far away, the cylinder certainly can drive the flotation pontoon subassembly and shift up, the control liquid level performance result that the test gained is normal, if the flotation pontoon is in the true buoyancy that receives in the fuel but can't drive the flotation pontoon subassembly and shift up, actual control liquid level performance result is abnormal, will cause the distortion phenomenon like this, if continue to adorn oil to oil tank 1 with the conclusion condition that control liquid level performance is normal, then the potential safety hazard can appear.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a high liquid level control valve of area test function that can direct access air supply and sensitivity are high.

In order to realize the purpose, the utility model discloses a technical scheme be: a high liquid level control valve with a test function is characterized in that a valve body is provided with an air inlet, an air outlet and a working port which are communicated with a valve cavity, a buoy is connected with a valve core assembly in the valve cavity through a mandril, a test unit is arranged below the buoy, the buoy drives the valve core assembly to alternately open/close the air inlet and the air outlet when moving up and down due to self weight or buoyancy or the jacking force of the test unit, the test unit comprises a shell body, the air cavity is arranged inside the shell body, a plunger is arranged in the shell body and forms sliding fit with the shell body, a top sleeve is arranged on a plunger upper cover protruding out of the shell body, a second spring is sleeved on the periphery of the plunger in the top sleeve, a test port is arranged on the shell body below the plunger, the lower end of the plunger abuts against the; when the self-testing port ventilates the air cavity, the air pressure drives the plunger piston to drive the jacking sleeve to move upwards, and the elastic force of the second spring simulates the buoyancy force of the buoy to drive the buoy to move upwards.

In the scheme, when the fuel in the oil tank is not full and the performance of the high liquid level control valve needs to be tested to be normal, the test port can be directly connected to a gas source on the tank type oil truck, the buoyancy of the buoy is simulated by utilizing the elasticity of the second spring to drive the buoy, if the buoy cannot drive the valve core assembly to act, the closing of the oil filling bottom valve cannot be controlled, and the high liquid level control valve is indicated to be out of order and needs to be overhauled; if the float bowl can drive the valve core assembly to act and can control the oil filling bottom valve to be closed, the performance of the high liquid level control valve is normal.

Drawings

FIG. 1 is a high level control schematic diagram of a tank truck;

FIG. 2 is an external view of the high level control valve;

fig. 3 and 4 are internal views of fig. 2;

FIG. 5 is a schematic diagram of a test unit;

FIG. 6a is a cross-sectional view of FIG. 5, FIG. 6b is a cross-sectional view of the test unit in its natural state, and FIG. 6c is a cross-sectional view of the test unit after venting;

FIG. 7 is an exploded view of the valve body and valve cartridge assembly;

FIG. 8 is a top view of the valve body and valve cartridge assembly;

FIG. 9 is a cross-sectional view A-A of FIG. 8;

FIG. 10 is a cross-sectional view B-B of FIG. 8;

FIG. 11 is a schematic structural diagram of the high level control valve in a normal use state where the level of the fuel in the tank is lower than a set maximum level;

FIG. 12 is a schematic structural diagram of the high level control valve in a normal use state where the level of the fuel in the oil tank is higher than a set maximum level;

FIG. 13 is a schematic diagram of the high level control valve in a test state;

fig. 14 is a partially enlarged schematic view of fig. 13.

Detailed Description

The present invention is discussed in further detail below in conjunction with fig. 1-6 a, 6b, 6c, and 7-14.

A high liquid level control valve with test function, a valve body 10 is provided with an air inlet 11, an air outlet 12 and a working port 13 which are communicated with a valve cavity 14, a float 30 is connected with a valve core component 20 in the valve cavity 14 through a mandril 70, a test unit 40 is arranged below the float 30, when the float 30 moves up and down due to dead weight or buoyancy or the jacking force of the test unit 40, the valve core assembly 20 is driven to alternately open/close the air inlet 11 and the air outlet 12, the testing unit 40 comprises a shell 41 with an air cavity A inside, a plunger 42 is arranged in the shell 41 and forms sliding fit with the shell 41, a top sleeve 44 is covered on the plunger 42 protruding out of the shell 41, a second spring 45 is sleeved on the periphery of the plunger 42 positioned in the top sleeve 44, a testing opening is arranged on the shell 41 below the plunger 42, when in a natural state, the lower end of the plunger 42 is abutted against the bottom of the air cavity A, and the upper end of the top sleeve 44 is abutted against the lower end of the buoy 30; when the self-testing port ventilates the air cavity A, the air pressure drives the plunger 42 to drive the top sleeve 44 to move upwards, and the elastic force of the second spring 45 simulates the buoyancy force of the buoy 30 to drive the buoy 30 to move upwards. In a natural state, as shown in fig. 6b and fig. 11, the lower end of the plunger 42 abuts against the bottom of the housing 41, the float 30 is at a low position due to self weight, the upper end of the top sleeve 44 abuts against the lower end of the float 30, the lower end of the top sleeve 44 abuts against the upper end face of the housing 41 for limiting, the float 30 drives the valve core assembly 20 to open the air inlet 11 and close the air outlet 12 at the same time, compressed air enters from the air inlet 11 and exits from the working port 13, and the oil filling bottom valve 3 is opened for normal oil filling operation; when the liquid level of the fuel in the oil tank 1 reaches the set highest liquid level, the buoy 30 rises under the action of buoyancy, the buoy 30 moves upwards to drive the valve core assembly 20 to close the air inlet 11 and open the air outlet 12 at the same time, the compressed air at the working port 13 is discharged from the air outlet 12, and the oil filling bottom valve 3 is closed to stop oil filling operation; when the liquid level control performance of the high liquid level control valve needs to be tested, the test port can be directly connected to an air source for a tank type oil vehicle, as shown in fig. 6c and 13, the air pressure drives the plunger 42 to move to the upper position, the top sleeve 44 moves upwards along with the plunger, the upper end of the top sleeve 44 abuts against the lower end of the float 30, the second spring 45 is in a compressed state, according to the relation between the acting force and the counterforce, the second spring 45 can provide a counterforce for the float 30, the counterforce is used for simulating the buoyancy of the float 30 and pushing the float 30 to move upwards, the float 30 moves upwards to drive the valve core assembly 20 to close the air inlet 11 and open the air outlet 12, the compressed air at the working port 13 is exhausted from the air outlet 12, and the oil-filled bottom valve 3 is closed, which indicates that the performance of the; if the compressed air still can come out from the working port 13 and the oil filling bottom valve 3 still can be opened, the failure of the high liquid level control valve is proved, and the maintenance is needed, so that the safety performance of the oil tank 1 is ensured.

Preferably, a first spring 43 is sleeved on the plunger 42 located inside the housing 41, a baffle 421 is arranged at the lower end of the plunger 42, one end of the first spring 43 abuts against the baffle 421, the other end of the first spring abuts against the inner wall of the upper end of the housing 41, the first spring 43 provides elastic force to drive the plunger 42 to move downwards and reset, an upper limiting step 416 is arranged at the middle section of the inner wall of the housing 41, when the self-testing opening vents air into the air cavity a, the plunger 42 moves upwards, and the upper limiting step 416 is matched with the baffle 421 to limit the stroke of the baffle 421. After the test is finished, the plunger 42 needs to be reset, so the first spring 43 is arranged, the elastic force of the first spring 43 drives the plunger 42 to move downwards to the bottom position of the air cavity A to realize automatic reset, the stroke of the plunger 42 is determined no matter the pressure of the introduced compressed air due to the blocking of the upper limiting step 416, and then the proper second spring 45 is selected according to relevant parameters so that the second spring 45 can simulate the buoyancy of the buoy 30.

Because the medium in the shell 41 is compressed air and the medium outside the shell 41 is fuel oil, in order to prevent the fuel oil from entering the inner cavity of the shell 41 and prevent the compressed air in the shell 41 from entering the outside of the shell 41, an annular groove 412 is formed at the connecting position of the shell 41 and the upper end of the plunger 42, a star-shaped sealing ring 413 is arranged in the annular groove 412, the star-shaped sealing ring 413 abuts against the outer wall of the plunger 42 to form sealing fit, an air nozzle 414 is arranged in the test port, and the air nozzle 414 is communicated with an air source through an air pipe 415. Because the housing 41 and the plunger 42 have relative movement in the axial direction, the star-shaped sealing ring 413 is adopted, and compared with an ordinary O-shaped ring, the star-shaped sealing ring 413 has two sealing functions, so that the sealing effect is good, and the service life is long.

Preferably, the plunger 42 is hollow, the plunger 42 is provided with insertion holes 422 penetrating through the two side walls, the insertion holes 422 are arranged at equal heights, the outer wall of the lower portion of the top sleeve 44 corresponding to the insertion holes 422 is provided with strip-shaped holes 441, the length direction of the strip-shaped holes 441 is the same as that of the plunger 42, the cylindrical pins 442 are inserted into the strip-shaped holes 441 and the insertion holes 422, the upper end of the top sleeve 44 is provided with a top plate 443, one end of the second spring 45 abuts against the step 423 of the outer wall of the plunger 42, and the other end of the second spring abuts against the top. When the plunger 42 is moved upward by the air pressure, the top sleeve 44 moves upward and pushes the float 30 upward, and the second spring 45 is compressed, and the second spring 45 will provide a reaction force to the float 30 according to the relationship between the force and the reaction force, so as to simulate the buoyancy of the float 30 and push the float 30 upward.

Further, the maximum travel L of pin 442 in slotted hole 441 is equal to the maximum travel S of stop 421 in housing 41, and is greater than the travel of buoy 30 in order to ensure that second spring 45 drives buoy 30 to the height at which buoy 30 floats. In a natural state, as shown in fig. 6b, the plunger 42 and the top sleeve 44 are driven away from each other by the elastic force of the second spring 45, the compression amount of the second spring 45 is the minimum, and the cylindrical pin 442 is located at the lower end of the strip-shaped hole 441; when the test port ventilates the air cavity a, the air pressure drives the plunger 42 to drive the top sleeve 44 to move upwards together, after the top sleeve 44 is driven by the elastic force of the second spring 45 to push the buoy 30 to ascend to an upper position, the buoy 30 cannot move upwards any more, because the maximum stroke L of the cylindrical pin 442 in the strip-shaped hole 441 is greater than that of the buoy 30, namely when the buoy 30 ascends to the upper position, the plunger 42 does not reach the upper limiting step 416, and therefore the upward movement is continued for a certain distance, at this time, the second spring 45 is further compressed, and the cylindrical pin 442 is located in the middle of the strip-shaped hole 441.

The test unit 40 and the buoy 30 are covered by a protective cylinder cover 50, the upper end of the protective cylinder cover 50 is fixedly connected with the valve body 10, the lower end of the protective cylinder cover 50 is provided with an end plate 51, the shell 41 is fixed on the end plate 51, the end plate 51 is provided with a through hole 511 through which an air supply nozzle 414 passes, and the cylinder wall of the protective cylinder cover 50 close to the lower end is provided with an oil inlet 52. Since the high liquid level control valve with the test function is installed at the top of the oil tank 1, the oil inlet 52 is provided on the wall of the protective cylinder cover 50 near the lower end, so that as long as the liquid level in the oil tank 1 reaches the height of the oil inlet 52, the oil can enter the protective cylinder cover 50 from the oil inlet 52, and further the float 30 is driven to move upwards to control the liquid level.

In order to install the air nozzle 414, the lower end port of the housing 41 is provided with the mounting seat 46, as shown in fig. 14, the mounting seat 46 is integrally T-shaped, and includes a large-diameter seat 465 engaged with the inner wall of the lower end port of the housing 41 and a small-diameter seat 466 passing through the through hole 511 on the end plate 51, an annular groove 461 is formed in the outer wall of the large-diameter seat 465, a sealing ring 462 is arranged in the annular groove 461, the sealing ring 462 abuts against the inner wall of the housing 41 and forms a sealing engagement, so as to prevent the compressed air in the air cavity a from escaping from between the large-diameter seat 465 and the housing 41 and affecting the movement of the plunger 42, and an air nozzle mounting.

In order to ensure that the plunger 42 slowly rises when compressed air is introduced and the air source is cut off, the plunger 42 is slowly moved downwards and reset under the elastic force of the first spring 43, the air nozzle mounting hole 463 comprises a large hole 463a arranged on the small-diameter seat ring 466, the air nozzle 414 is fixed in the large hole 463a, the large-diameter seat ring 465 is provided with a small hole 463b communicated with the large hole 463a, the other end of the small hole 463b is communicated with the air cavity A, and the large hole 463a and the small hole 463b jointly form a test port. When compressed air is introduced, the compressed air from the air nozzle 414 firstly enters the large hole 463a, and then slowly enters the air cavity A through the buffering action of the small hole 463b, and pushes the plunger 42 to slowly move upwards; similarly, when the air supply is cut off, the first spring 43 drives the plunger 42 to move downwards, and the compressed air in the air chamber a first comes out of the small hole 463b and then is exhausted, so that the buffer function is also achieved.

In order to realize the fixed connection between the test unit 40 and the protective cylinder cover 50, referring to fig. 14, a lower limit step 417 is arranged at the lower section of the inner wall of the housing 41, the distance between the lower limit step 417 and the upper limit step 416 is equal to the maximum stroke S of the baffle 421 in the housing 41, a groove 418 is arranged on the inner wall of the housing 41 below the large-diameter race 465, the hole elastic snap spring 419 is clamped in the groove 418, the upper end surface of the large-diameter race 465 abuts against the lower limit step 417, and the lower end surface of the large-diameter race 465 abuts against the hole elastic snap spring 419 to form axial limit matching; the end plate 51 is provided with a concave part 512, the lower end of the shell 41 is arranged in the concave part 512, the small-diameter seat ring 466 penetrates through the through hole 511, the outer wall of the small-diameter seat ring 466 protruding to the outside of the end plate 51 is provided with a shaft groove 467, the shaft elastic retainer ring 468 is clamped in the shaft groove 467, and the lower end surface of the end plate 51 is abutted against the shaft elastic retainer ring 468 to form axial limit matching. First, the seat ring 46 is placed at the lower end position of the inner wall of the housing 41, the seat ring 46 is fixed at the lower end position of the inner wall of the housing 41 by the elastic snap spring 419 through the hole, then the lower end of the housing 41 is placed in the recess 512, the upward movement of the seat ring 46 is restricted by the shaft elastic snap ring 468, and the positions of the seat ring 46, the housing 41, and the end plate 51 are relatively fixed.

The valve core assembly 20 comprises a valve rod 21, the middle section of the valve rod 21 is hinged with the valve body 10 through a hinge shaft pin 22, the shaft core of the hinge shaft pin 22 is arranged perpendicular to the ejector rod 70, the valve rod 21 is provided with an intake valve 23 and an exhaust valve 24 at positions corresponding to the intake port 11 and the exhaust port 12 respectively, and when the buoy 30 moves up and down due to self weight or buoyancy or thrust of the test unit 40, the valve rod 21 rotates around the hinge shaft pin 22 to drive the intake valve 23 and the exhaust valve 24 to alternately open or close the intake port 11 and the exhaust port 12. In a normal use state: as shown in fig. 11, when the fuel level of the oil tank 1 is lower than the set maximum level, the float 30 sinks due to its own weight, the valve core assembly 20 operates, the intake valve 23 opens the intake port 11, the exhaust valve 24 closes the exhaust port 12, at this time, the intake port 11 communicates with the working port 13, compressed air enters from the intake port 11 and goes out from the working port 13, the oil filling bottom valve 3 is opened, and the oil tank 1 performs normal oil filling operation; when the liquid level of the oil in the oil tank 1 reaches the set maximum liquid level, as shown in fig. 12, the float 30 floats upwards due to buoyancy, the valve core assembly 20 operates, the intake valve 23 closes the intake port 11, the exhaust valve 24 opens the exhaust port 12, at this time, the exhaust port 12 is communicated with the working port 13, compressed air is discharged from the exhaust port 12, thus the oil filling bottom valve 3 is closed, and the oil filling operation of the oil tank 1 is stopped. When the liquid level control performance of the high liquid level control valve needs to be tested, as shown in fig. 13, the test unit 40 acts, the elastic force of the second spring 45 is used for simulating the buoyancy force when the float 30 rises, if the pushing force of the second spring 45 can drive the valve core assembly 20 to act, the intake valve 23 closes the intake port 11, the exhaust valve 24 opens the exhaust port 12, the function of the high liquid level valve is normal, otherwise, the function of the high liquid level valve is abnormal, and the maintenance is needed.

The valve rod 21 is provided with a first magnet 25, the upper end of the ejector rod 70 is provided with a second magnet 71, the adjacent side magnetic poles of the first magnet 25 and the second magnet 71 are different, a third spring 26 is arranged between the valve rod 21 and the valve body 10, the buoyancy of the float 30 or the jacking force of the test unit 40 drives the second magnet 71 to be close to the first magnet 25, the magnetic force of the first magnet 25 and the second magnet 71 overcomes the elastic force of the third spring 26 to attract, the valve rod 21 is driven to rotate around the hinged shaft pin 22 to drive the inlet valve 23 to close the air inlet 11, meanwhile, the exhaust valve 24 opens the exhaust port 12, and the working port 13 is communicated with the exhaust port 12; the gravity of the float 30 overcomes the magnetic force of the first and second magnets 25, 71 to drive the second magnet 71 to be far away from the first magnet 25, after the magnetic force of the first and second magnets 25, 71 is weakened or disappeared, the third spring 26 drives the valve rod 21 to rotate around the hinge shaft pin 22 to drive the intake valve 23 to open the intake port 11, meanwhile, the exhaust valve 24 closes the exhaust port 12, and the working port 13 is communicated with the intake port 11. In a normal use state, when the fuel level of the oil tank 1 is lower than a set maximum level, as shown in fig. 11, the gravity of the float 30 overcomes the magnetic force between the first and second magnets 25, 71 to drive the second magnet 71 away from the first magnet 25, after the magnetic force of the first and second magnets 25, 71 gradually disappears or weakens to a certain extent, the third spring 26 drives the valve rod 21 to rotate around the hinge pin 22, the first magnet 25 moves upward under the elastic force of the third spring 26, and according to the lever principle, the air inlet 11 at one end of the lever is opened by the air inlet valve 23, and the exhaust valve 24 closes the exhaust port 12; when the fuel level of the oil tank 1 reaches the set maximum level, as shown in fig. 12, the second magnet 71 is pushed to move upward and approach the first magnet 25 by the buoyancy of the float 30, and when the distance between the first and second magnets 25, 71 reaches a certain short time, the magnetic force of the first and second magnets 25, 71 is increased enough to overcome the elastic force of the third spring 26, the first and second magnets 25, 71 attract each other, the air inlet 11 is closed by the air inlet valve 23, and the exhaust valve 24 opens the exhaust port 12. When a test is required, as shown in fig. 13, because the elastic force of the second spring 45 simulates the buoyancy of the float 30, the second spring 45 pushes the second magnet 71 to move upward and approach the first magnet 25, when the distance between the first and second magnets 25, 71 reaches a certain short distance, the magnetic force of the first and second magnets 25, 71 increases enough to overcome the elastic force of the third spring 26, the first and second magnets 25, 71 attract each other, the air inlet 11 is closed by the air inlet valve 23, and the exhaust valve 24 opens the exhaust port 12, which indicates that the high liquid level valve functions normally, otherwise, the high liquid level valve functions abnormally.

In order to connect with the oil tank 1, a connecting flange 60 is arranged at the junction of the valve body 10 and the protective cylinder cover 50, and a plurality of mounting holes 61 are uniformly arranged on the disc surface of the connecting flange 60 at intervals along the circumferential direction. The valve body 10, the valve core assembly 20 and the connecting flange 60 are installed outside the oil tank 1 and then connected with an air source and other valve components, and the mandril 70, the buoy 30 and the protective cylinder cover 51 are positioned inside the oil tank 1.

The connecting flange 60 is further provided with a test air tap 62, and the test air tap 62 is communicated with the air pipe 415. By providing the test air tap 62 on the attachment flange 60, no additional fastening means for fastening the air tube 415 are required.

It should be noted that the high-level control valve with the test function is used as a valve for controlling the highest liquid level of the oil tank 1 under normal working conditions, and the test unit 40 is started under the working conditions that the oil in the oil tank 1 is not full and whether the valve fails needs to be detected or not.

Claims (12)

1. The utility model provides a take test function's high liquid level control valve, set up on valve body (10) with communicating air inlet (11) of valve pocket (14), gas vent (12) and working port (13), flotation pontoon (30) link to each other through case subassembly (20) in ejector pin (70) and valve pocket (14), the below of flotation pontoon (30) is provided with test unit (40), when flotation pontoon (30) reciprocate because of the top thrust of dead weight or buoyancy or test unit (40), drive case subassembly (20) and open/close air inlet (11) and gas vent (12) in turn, its characterized in that: the testing unit (40) comprises a shell (41) with an air cavity (A) arranged inside, a plunger (42) is arranged in the shell (41) and is in sliding fit with the shell (41), a top sleeve (44) covers the plunger (42) protruding out of the shell (41), a second spring (45) is sleeved on the periphery of the plunger (42) positioned in the top sleeve (44), a testing port is formed in the shell (41) below the plunger (42), during a natural state, the lower end of the plunger (42) is abutted against the bottom of the air cavity (A), and the upper end of the top sleeve (44) is abutted against the lower end of a buoy (30); when the self-testing port ventilates the air cavity (A), the air pressure drives the plunger (42) to drive the top sleeve (44) to move upwards, and the elastic force of the second spring (45) simulates the buoyancy force of the buoy (30) to drive the buoy (30) to move upwards.

2. The high level control valve with test function according to claim 1, characterized in that: be located the cover and be equipped with first spring (43) on inside plunger (42) of casing (41), there is baffle (421) lower extreme of plunger (42), the one end and baffle (421) of first spring (43) lean on, the other end leans on with casing (41) upper end inner wall, first spring (43) provide elasticity and drive plunger (42) downstream and reset, the inner wall middle section position department of casing (41) is provided with upper limit step (416), when ventilating from the test mouth to air cavity (A), plunger (42) rebound, upper limit step (416) and baffle (421) cooperation limit baffle (421) the stroke.

3. The high level control valve with test function according to claim 2, characterized in that: an annular groove (412) is formed in the connecting position of the shell (41) and the upper end of the plunger (42), a star-shaped sealing ring (413) is arranged in the annular groove (412), the star-shaped sealing ring (413) abuts against the outer wall of the plunger (42) to form sealing fit, an air nozzle (414) is arranged in the test port, and the air nozzle (414) is communicated with an air source through an air pipe (415).

4. The high level control valve with test function according to claim 2, characterized in that: plunger (42) are hollow, jack (422) that link up the both sides wall are seted up on plunger (42), two jack (422) are arranged such as height, set up bar hole (441) on the outer wall that top cover (44) lower part and jack (422) correspond, the length direction in bar hole (441) is unanimous with the length direction of plunger (42), cylindric lock (442) are inserted in bar hole (441), jack (422), the upper end of top cover (44) is provided with roof (443), the one end of second spring (45) is supported with step (423) of plunger (42) outer wall and is supported, the other end supports with roof (443) hypoplastron and supports.

5. The high level control valve with test function according to claim 4, characterized in that: the maximum stroke L of the cylindrical pin (442) in the strip-shaped hole (441) is equal to the maximum stroke S of the baffle (421) in the shell (41), and the maximum stroke L is larger than the stroke of the buoy (30).

6. The high level control valve with test function according to claim 1, characterized in that: the testing unit (40) and the periphery of the buoy (30) are covered with a protective cylinder cover (50), the upper end of the protective cylinder cover (50) is fixedly connected with the valve body (10), the lower end of the protective cylinder cover is provided with an end plate (51), the shell (41) is installed on the end plate (51), the end plate (51) is provided with a through hole (511) through which an air supply nozzle (414) passes, and the wall of the protective cylinder cover (50) close to the lower end is provided with an oil inlet hole (52).

7. The high level control valve with test function according to claim 6, characterized in that: the lower extreme port department of casing (41) is provided with installation seat circle (46), installation seat circle (46) are whole T type, include the big footpath seat circle (465) with the lower extreme port inner wall complex of casing (41) and pass path seat circle (466) of through-hole (511) on end plate (51), ring channel (461) have been seted up to the outer wall of big footpath seat circle (465), be provided with sealing washer (462) in ring channel (461), sealing washer (462) offset and constitute sealed cooperation with casing (41) inner wall, air tap mounting hole (463) have been seted up on installation seat circle (46).

8. The high level control valve with test function according to claim 7, characterized in that: the air nozzle mounting hole (463) comprises a large hole (463a) formed in the small-diameter seat ring (466), the air nozzle (414) is fixed in the large hole (463a), the large-diameter seat ring (465) is provided with a small hole (463b) communicated with the large hole (463a), the other end of the small hole (463b) is communicated with the air cavity (A), and the large hole (463a) and the small hole (463b) jointly form a test port.

9. The high level control valve with test function according to claim 7, characterized in that: a lower limiting step (417) is arranged at the lower section of the inner wall of the shell (41), the distance between the lower limiting step (417) and the upper limiting step (416) is equal to the maximum stroke S of the baffle (421) in the shell (41), a groove (418) is formed in the inner wall of the shell (41) below the large-diameter seat ring (465), the hole is clamped in the groove (418) by an elastic clamp spring (419), the upper end surface of the large-diameter seat ring (465) abuts against the lower limiting step (417), and the lower end surface of the large-diameter seat ring (465) abuts against the hole elastic clamp spring (419) to form axial limiting fit; the end plate (51) is provided with a concave part (512), the lower end of the shell (41) is arranged in the concave part (512), the small-diameter seat ring (466) penetrates through the through hole (511), the outer wall of the small-diameter seat ring (466) protruding to the outside of the end plate (51) is provided with a shaft groove (467), the shaft elastic retainer ring (468) is clamped in the shaft groove (467), and the lower end face of the end plate (51) is abutted against the shaft elastic retainer ring (468) to form axial limiting fit.

10. The high level control valve with test function according to claim 1, characterized in that: the valve core assembly (20) comprises a valve rod (21), the middle section of the valve rod (21) is hinged with the valve body (10) through a hinged shaft pin (22), a shaft core of the hinged shaft pin (22) is vertically arranged with an ejector rod (70), the positions, corresponding to the air inlet (11) and the exhaust port (12), of the valve rod (21) are respectively provided with an air inlet valve (23) and an exhaust valve (24), and when the buoy (30) moves up and down due to self weight or buoyancy or the thrust of the test unit (40), the valve rod (21) rotates around the hinged shaft pin (22) to drive the air inlet valve (23) and the exhaust valve (24) to alternately open/close the air inlet (11) and the exhaust.

11. The high level control valve with test function according to claim 10, characterized in that: a first magnet (25) is arranged on the valve rod (21), a second magnet (71) is arranged at the upper end of the ejector rod (70), the adjacent sides of the first magnet (25) and the second magnet (71) have different magnetic poles, a third spring (26) is arranged between the valve rod (21) and the valve body (10), the buoyancy of the buoy (30) or the jacking force of the test unit (40) drives the second magnet (71) to be close to the first magnet (25), the magnetic force of the first magnet (25) and the second magnet (71) overcomes the elastic force of the third spring (26) to attract, the valve rod (21) is driven to rotate around the hinged shaft pin (22) to drive the air inlet (23) to close the air inlet (11), meanwhile, the exhaust valve (24) opens the exhaust port (12), and the working port (13) is communicated with the exhaust port; the gravity of the float bowl (30) overcomes the magnetic force of the first magnet (25) and the second magnet (71), the second magnet (71) is driven to be far away from the first magnet (25), after the magnetic force of the first magnet (25) and the second magnet (71) is weakened or disappears, the third spring (26) drives the valve rod (21) to rotate around the hinged shaft pin (22) to drive the air inlet (23) to open the air inlet (11), meanwhile, the exhaust valve (24) closes the exhaust port (12), and the working port (13) is communicated with the air inlet (11).

12. The high level control valve with test function according to claim 6, characterized in that: a connecting flange (60) is arranged at the junction of the valve body (10) and the protective cylinder cover (50), a plurality of mounting holes (61) are uniformly arranged on the disc surface of the connecting flange (60) along the circumferential direction at intervals, a test air nozzle (62) is further arranged on the connecting flange (60), and the test air nozzle (62) is communicated with an air pipe (415).

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