Stacked pressure switch

Abstract

The utility model relates to the technical field of hydraulic control, and discloses a stacked pressure switch. The stacked pressure switch comprises a valve body, a side cover, a sleeve, an induction block, a spring, a push rod, a microswitch and a plug, the valve body is provided with a port P, a port A, a port B, a port T and a first flow channel, the side cover is arranged on the valve body, the sleeve, the microswitch and the plug are arranged on the side cover, the induction block is arranged in an installation groove of the side cover, the spring is arranged in the sleeve, and the push rod is arranged in the sleeve. And the push rod penetrates through the mounting channel of the side cover. According to the stacked pressure switch, hydraulic oil enters the valve body from the port P to generate thrust to the push rod, when the oil pressure of the hydraulic oil exceeds a threshold value, the push rod pushes the induction block to enable the spring to be compressed, the induction block is separated from the microswitch, the working state of the microswitch is changed, and an electric signal is sent to the outside through the plug. And the oil pressure of the hydraulic oil is monitored. The pressure switch is simple in structure and convenient to install and use.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of hydraulic control, and in particular to a superimposed pressure switch. Background Art

[0002] The hydraulic control system is powered by an electric motor and uses a hydraulic pump to convert mechanical energy into pressure to push the hydraulic oil. The hydraulic oil pressure drives various equipment to complete the required work.

[0003] In industrial production, it is necessary to monitor the hydraulic oil pressure through a pressure switch (pressure controller). When the oil pressure reaches the set threshold, the pressure switch will output a contact signal to ensure the safe use of various hydraulic equipment.

[0004] The inventors of the present application have discovered that the current pressure switches used to monitor hydraulic oil have a complex structure and are inconvenient to install and use. Utility Model Content

[0005] The purpose of the present utility model is to provide a superimposed pressure switch to solve the problems in the above-mentioned background technology.

[0006] The embodiment of the utility model provides a superimposed pressure switch, comprising: a valve body, a side cover, a sleeve, a sensing block, a spring, a push rod, a micro switch and a plug;

[0007] The valve body is provided with a through port P, port A, port B and port T, which are respectively used to connect with external hydraulic components;

[0008] The valve body is provided with a first flow channel;

[0009] The side cover is arranged on one side of the valve body, and the side cover is provided with a mounting channel and a mounting groove, and the mounting channel is connected to the P port through the first flow channel;

[0010] The sleeve is arranged on the side cover;

[0011] The sensing block is slidably arranged in the mounting groove, the spring is arranged in the sleeve, and two ends of the spring are respectively abutted against the sensing block and the sleeve;

[0012] The micro switch and the plug are arranged on the side cover, the trigger button of the micro switch abuts against the sensor block, and the plug is electrically connected to the micro switch;

[0013] The push rod is slidably arranged in the installation channel and is abutted against the sensing block. When the hydraulic oil pressure of the P port exceeds a threshold value, the push rod is used to push the sensing block to separate the sensing block from the trigger button of the micro switch, and the plug is used to output the working signal of the micro switch.

[0014] Based on the above scheme, it can be seen that the stacked pressure switch of the present invention is provided with a valve body, a side cover, a sleeve, a sensor block, a spring, a push rod, a micro switch and a plug. The valve body is provided with a P port, an A port, a B port, a T port and a first flow channel. The side cover is provided on the valve body, and the side cover is provided with a mounting channel and a mounting groove. The mounting channel is connected to the P port through the first flow channel. The sleeve is provided on the side cover, the sensor block is provided in the mounting groove, the spring is provided in the sleeve, and the two ends of the spring are respectively abutted against the sensor block and the sleeve. The micro switch and the plug are provided on the side cover, and the plug is electrically connected to the micro switch. The push rod is provided in the mounting channel of the side cover. The stacked pressure switch of the present invention can be stacked and assembled into a certain part of the valve group, such as embedded in the oil circuit board, or stacked between the valve and the solenoid valve. The openings on both sides of the P port, A port, B port and T port of the valve body are respectively connected to external hydraulic components to save installation space. Hydraulic oil from the hydraulic supply system enters the valve body through port P, generating thrust on the push rod through the first flow channel. When the hydraulic oil pressure exceeds the threshold (set value), the thrust on the push rod increases, pushing the sensor block, compressing the spring. This separates the sensor block from the microswitch trigger button, causing the microswitch trigger button to change its operating state. When the microswitch trigger button changes its operating state, an electrical signal is transmitted to the outside world through the plug, which can issue an alarm or control the hydraulic equipment to stop working, thus achieving monitoring of the hydraulic oil pressure. The pressure switch has a simple structure and is easy to install and use.

[0015] In a feasible solution, it also includes: a pressure regulating mechanism:

[0016] The pressure regulating mechanism comprises: a spring seat, a hexagonal nut, a fastening nut and a pressure regulating screw;

[0017] The sleeve is tubular, and the spring seat is slidably arranged in the sleeve and abuts against the spring;

[0018] The hexagonal nut is sleeved on the sleeve, and the hexagonal nut is provided with a threaded hole;

[0019] The pressure-adjusting screw is engaged with the threaded hole of the hexagonal nut and is abutted against the spring seat to adjust the compression of the spring. The fastening nut is engaged with the pressure-adjusting screw and is abutted against the hexagonal nut.

[0020] In a feasible solution, both the sensing block and the spring seat are provided with limiting protrusions for inserting the spring.

[0021] In a feasible solution, the sensing block is provided with a limiting groove for the push rod to be inserted into.

[0022] In a feasible solution, it further includes: a damping plug;

[0023] The damping plug is disposed in the first flow channel and is used to reduce the impact force of the hydraulic oil on the push rod.

[0024] In a feasible solution, it further includes: a first O-type sealing ring, a second O-type sealing ring and a third O-type sealing ring;

[0025] The first O-type sealing ring is sleeved on the push rod and is used to abut against the side cover;

[0026] The second O-ring and the third O-ring are arranged on the side cover and are used to abut against the valve body.

[0027] In a feasible solution, it also includes: screw plugging;

[0028] The valve body is provided with a second flow channel;

[0029] The side cover is provided with an oil drain channel;

[0030] The push rod is provided with an oil drain groove, which is located between the valve body and the first O-ring and is connected to the T-port through the oil drain channel and the second flow channel;

[0031] The screw plug is arranged on the side cover and is used to block the communication between the oil drain channel and the atmosphere.

[0032] In a feasible solution, a first mounting plane and a second mounting plane are respectively provided on opposite sides of the valve body;

[0033] The inlet and outlet openings of the P port, the A port, the B port, and the T port are all located on the first installation plane and the second installation plane.

[0034] In a feasible solution, the valve body is provided with a plurality of fixing holes for installing and fixing the valve body.

[0035] In a feasible solution, the side cover is provided with a mounting hole;

[0036] The valve body is provided with threaded holes so that the side cover is fixed to the valve body by fixing bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0038] Figure 1This is a schematic front view of a superimposed pressure switch in an embodiment of the present utility model;

[0039] Figure 2 Schematic side view of a superimposed pressure switch in an embodiment of the present utility model;

[0040] Figure 3 In the embodiment of the present utility model Figure 2 A partial enlarged view of the

[0041] Figure 4 It is a top view schematic diagram of the superimposed pressure switch in the embodiment of the present utility model.

[0042] Numbers in the figure:

[0043] 1. Valve body; 101. First mounting plane; 102. Second mounting plane; 11. First flow channel; 12. Damping plug; 13. Second flow channel; 14. Fixing hole; 2. Side cover; 21. Oil drain channel; 22. Fixing bolt; 3. Sleeve; 401. Limiting bump; 41. Sensor block; 42. Spring; 43. Push rod; 431. Oil drain groove; 51. Micro switch; 52. Plug; 6. Pressure regulating mechanism; 61. Spring seat; 62. Hexagonal nut; 63. Fastening nut; 64. Pressure regulating screw; 71. First O-ring; 72. Second O-ring; 73. Third O-ring; 8. Screw plug. DETAILED DESCRIPTION

[0044] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0047] The following specific embodiments are used to describe the technical solution of the present invention in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0048] As described in the background of this application, in industrial production, it is necessary to monitor the oil pressure of hydraulic oil to ensure the safe use of various hydraulic equipment.

[0049] The inventors of the present application have discovered that the current pressure switches used to monitor hydraulic oil have a complex structure and are inconvenient to install and use.

[0050] In order to solve the above problems, the inventors of this application have proposed the technical solution of this application, and the specific embodiments are as follows:

[0051] Figure 1 This is a schematic diagram of the main view of the superimposed pressure switch in the embodiment of the present utility model. Figure 2 This is a side view of a superimposed pressure switch in an embodiment of the present utility model. Figure 3 In the embodiment of the present utility model Figure 2 A partial enlarged view of Figure 4 It is a top view schematic diagram of the superimposed pressure switch in the embodiment of the present utility model.

[0052] like Figures 1 to 4 As shown, the superimposed pressure switch of this embodiment includes: a valve body 1, a side cover 2, a sleeve 3, a sensor block 41, a spring 42, a push rod 43, a micro switch 51 and a plug 52.

[0053] The valve body 1 is provided with an oil inlet port P, a working oil port A, a working oil port B and an oil return port T which are penetrating from front to back. The P port, A port, B port and T port of the valve body 1 are independent of each other.

[0054] A first flow channel 11 is provided inside the valve body 1 .

[0055] The side cover 2 is arranged on the bottom side of the valve body 1. The side cover 2 is provided with a mounting channel and a mounting groove. The mounting channel and the mounting groove of the side cover 2 are communicated with each other.

[0056] One end of the first flow channel 11 of the valve body 1 is connected to the P port of the valve body 1 , and the other end of the first flow channel 11 is connected to the installation channel of the side cover 2 , so that the installation channel of the side cover 2 is connected to the P port of the valve body 1 .

[0057] The sleeve 3 is arranged on the side cover 2 , and one end of the sleeve 3 is inserted into the mounting groove of the side cover 2 .

[0058] The sensing block 41 is slidably disposed in the mounting groove of the side cover 2 , and the spring 42 is disposed in the sleeve 3 . The upper and lower ends of the spring 3 respectively abut against the sensing block 41 and the sleeve 3 .

[0059] The micro switch 51 and the plug 52 are respectively disposed on the side cover 2 . The trigger button of the micro switch 51 abuts against the top side wall of the sensor block 41 . The micro switch 51 and the plug 52 are electrically connected.

[0060] The push rod 43 is slidably disposed in the installation channel of the side cover 2 , and the bottom end of the push rod 43 contacts and abuts against the sensor block 41 .

[0061] In this embodiment, the pressure switch can be assembled in a certain part of the entire valve group, such as embedding the valve body of the pressure switch into the oil circuit board of the valve group, or stacking the valve body between the valve and the solenoid valve of the valve group.

[0062] like Figure 2 As shown in the figure, the openings on both sides of the valve body's P, A, B, and T ports are connected to external hydraulic components. Hydraulic oil from the hydraulic supply system enters the valve body through the P port. The hydraulic oil passes through the valve body's first flow channel, exerting a downward thrust on the push rod. The push rod and the sensor block maintain balance due to the thrust of the hydraulic oil and the action of the spring. At this time, the sensor block maintains contact with the trigger button of the micro switch.

[0063] When the hydraulic oil pressure at port P of the valve body exceeds the threshold (set value), the thrust on the push rod increases, pushing the sensor block downward and compressing the spring, causing the sensor block to separate from the trigger button of the micro switch, and the operating state of the trigger button of the micro switch changes (depending on the wiring method, the micro switch can change from the on state to the off state, or from the off state to the on state). When the operating state of the trigger button of the micro switch opening changes, an electrical signal is sent to the outside world through the plug to monitor the hydraulic oil pressure.

[0064] From the foregoing, it is readily apparent that the stacked pressure switch of this embodiment comprises a valve body, a side cover, a sleeve, a sensing block, a spring, a push rod, a micro switch, and a plug. The valve body is provided with ports P, A, B, and T, and a first flow channel. The side cover is disposed on the valve body and has a mounting channel and a mounting groove. The mounting channel communicates with port P through the first flow channel. The sleeve is disposed on the side cover, the sensing block is disposed within the mounting groove, the spring is disposed within the sleeve, the ends of the spring abutting against the sensing block and sleeve, respectively. The micro switch and plug are disposed on the side cover, the plug being electrically connected to the micro switch, and the push rod being disposed within the mounting channel of the side cover. The stacked pressure switch of this embodiment can be assembled and stacked into a specific location of a valve assembly, such as embedded in an oil circuit board or stacked between a valve and a solenoid valve. The openings on either side of ports P, A, B, and T of the valve body are connected to external hydraulic components, thereby saving installation space. Hydraulic oil from the hydraulic supply system enters the valve body through port P, generating thrust on the push rod through the first flow channel. When the hydraulic oil pressure exceeds the threshold (set value), the thrust on the push rod increases, pushing the sensor block, compressing the spring. This separates the sensor block from the microswitch trigger button, causing the microswitch trigger button to change its operating state. When the microswitch trigger button changes its operating state, an electrical signal is transmitted to the outside world through the plug, which can issue an alarm or control the hydraulic equipment to stop working, thus achieving monitoring of the hydraulic oil pressure. The pressure switch has a simple structure and is easy to install and use.

[0065] Optional, such as Figure 2 As shown, the superimposed pressure switch in this embodiment further includes: a pressure regulating mechanism 6.

[0066] The pressure regulating mechanism 6 includes a spring seat 61 , a hexagonal nut 62 , a fastening nut 63 and a pressure regulating screw 64 .

[0067] The sleeve 3 is in the shape of a sleeve penetrating up and down. The spring seat 61 is slidably arranged in the sleeve 3 up and down. The top end of the spring seat 61 abuts against the bottom end of the spring 42.

[0068] The hexagonal nut 62 is sleeved on the bottom end of the sleeve 3 , and a threaded hole is provided at the center of the hexagonal nut 62 .

[0069] The pressure regulating screw 64 is engaged with the threaded hole of the hexagonal nut 62, and the top of the pressure regulating screw 64 abuts against the spring seat 61. When the pressure regulating screw 64 rotates, it adjusts the compression amount of the spring 42, thereby adjusting the alarm pressure threshold of the pressure switch.

[0070] The fastening nut 63 is engaged with the pressure-adjusting screw 64 . When the fastening nut 63 is tightened, it abuts against the hexagonal nut 62 , making the pressure-adjusting screw 64 more stable.

[0071] Furthermore, in the stacked pressure switch of this embodiment, both the sensing block 41 and the spring seat 61 are provided with a limiting protrusion 401 .

[0072] The spring 42 is disposed in the sleeve 3 , and the upper and lower ends of the spring 42 are respectively inserted into the sensing block 41 and the limiting protrusion 401 of the spring seat 61 , so that the spring 42 remains stable in the sleeve 3 .

[0073] Optionally, in the superimposed pressure switch of this embodiment, a limiting groove is provided at the top of the sensing block 41 , and the bottom end of the push rod 43 is inserted into the limiting groove of the sensing block 41 and abuts against the sensing block 41 .

[0074] Optionally, the superimposed pressure switch in this embodiment further includes a damping plug 12 .

[0075] The damping plug 12 is slidably disposed in the first flow channel 11 of the valve body 1 and is located on a side close to the push rod 43 .

[0076] When hydraulic oil enters the P port of the valve body 1, the damping plug 12 forms a buffer to reduce the instantaneous impact force of the hydraulic oil on the push rod 43, thereby preventing the push rod 43 from receiving excessive instantaneous impact and causing a false alarm of the micro switch 51.

[0077] Optionally, the superimposed pressure switch in this embodiment further includes: a first O-ring 71 , a second O-ring 72 and a third O-ring 73 .

[0078] A first O-ring 71 is mounted on the circumferential sidewall of the push rod 43, embedded in the groove of the push rod 43, and abuts against the inner wall of the mounting channel of the side cover 2. The first O-ring 71 further seals the push rod 43 and the side cover 2, preventing hydraulic oil from seeping into the cavity of the sleeve 3 through the clearance between the push rod 43 and the side cover 2.

[0079] The second O-ring 72 and the third O-ring 73 are respectively disposed in the top groove of the side cover 2 and abut against the bottom side of the valve body 1 , thereby making the side cover 2 and the valve body 1 more sealed.

[0080] Further, such as Figure 2 and Figure 3 As shown, the superimposed pressure switch in this embodiment further includes a screw plug 8.

[0081] A second flow channel 13 is provided inside the valve body 1 .

[0082] A right-angled oil drain channel 21 is provided inside the side cover 2 . One end of the second flow channel 13 of the valve body 1 is connected to the T-port of the valve body 1 , and the other end of the second flow channel 13 is connected to one end of the oil drain channel 21 of the side cover 2 .

[0083] An oil drain groove 431 is provided on the circumferential outer wall of the push rod 43. The oil drain groove 431 of the push rod 43 is located between the valve body 1 and the first O-ring 71. The oil drain groove 431 of the push rod 43 is connected to the other end of the oil drain channel 21 of the side cover 2, so that the oil drain groove 431 of the push rod 43 is connected to the T-port of the valve body 1.

[0084] The screw plug 8 is engaged with the threaded hole on the side wall of the side cover 2 to seal the opening of the oil drain channel 21 to block the communication between the oil drain channel 21 of the side cover 2 and the external atmosphere.

[0085] In this embodiment, when the hydraulic oil leaks into the oil drain groove of the push rod along the gap between the push rod and the side cover, it is led back to the T-port of the valve body through the oil drain channel of the side cover and the second flow channel of the valve body, and then flows back to the oil tank of the hydraulic oil supply system through the T-port of the valve body. The hydraulic oil will not flow into the cavity of the sleeve, making the valve body more sealed.

[0086] Optional, such as Figure 1 As shown, in the stacked pressure switch of this embodiment, a first mounting plane 101 and a second mounting plane 102 are respectively provided on two opposite sides (left and right sides) of the valve body 1 .

[0087] The inlet and outlet ports of the valve body 1, namely, the P port, the A port, the B port and the T port, are all located on the first mounting plane 101 and the second mounting plane 102 of the valve body 1, which facilitates the connection and communication between the valve body 1 and other external hydraulic components.

[0088] Furthermore, in the stacked pressure switch of this embodiment, the valve body 1 is provided with a plurality of fixing holes 14 on the first mounting plane 101 and the second mounting plane 102 , so as to facilitate the installation and fixation of the valve body 1 .

[0089] Optionally, in the superimposed pressure switch of this embodiment, the side cover 2 is provided with a mounting hole.

[0090] The side wall of the valve body 1 is provided with a threaded hole, and the fixing bolt 22 passes through the mounting hole of the side cover 2 and engages with the threaded hole of the valve body 1, so that the side cover 2 is detachably fixed to the side wall of the valve body 1.

[0091] The micro switch 51 and the plug 52 are fixed to the side cover 2 by screws respectively.

[0092] In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may mean that the first feature and the second feature are in direct contact, or the first feature and the second feature are in indirect contact through an intermediate medium.

[0093] Furthermore, when a first feature is “above,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0094] In the description of this specification, reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A superimposed pressure switch, characterized in that: include: Valve body, side cover, sleeve, sensor block, spring, push rod, micro switch and plug; The valve body is provided with a through port P, port A, port B and port T, which are respectively used to connect with external hydraulic components; The valve body is provided with a first flow channel; The side cover is arranged on one side of the valve body, and the side cover is provided with a mounting channel and a mounting groove, and the mounting channel is connected to the P port through the first flow channel; The sleeve is arranged on the side cover; The sensing block is slidably arranged in the mounting groove, the spring is arranged in the sleeve, and two ends of the spring are respectively abutted against the sensing block and the sleeve; The micro switch and the plug are arranged on the side cover, the trigger button of the micro switch abuts against the sensor block, and the plug is electrically connected to the micro switch; The push rod is slidably arranged in the installation channel and is abutted against the sensing block. When the hydraulic oil pressure of the P port exceeds a threshold value, the push rod is used to push the sensing block to separate the sensing block from the trigger button of the micro switch, and the plug is used to output the working signal of the micro switch.

2. The superimposed pressure switch according to claim 1, characterized in that: Also includes: Pressure regulating mechanism: The pressure regulating mechanism comprises: a spring seat, a hexagonal nut, a fastening nut and a pressure regulating screw; The sleeve is tubular, and the spring seat is slidably arranged in the sleeve and abuts against the spring; The hexagonal nut is sleeved on the sleeve, and the hexagonal nut is provided with a threaded hole; The pressure-adjusting screw is engaged with the threaded hole of the hexagonal nut and is abutted against the spring seat to adjust the compression of the spring. The fastening nut is engaged with the pressure-adjusting screw and is abutted against the hexagonal nut.

3. The superimposed pressure switch according to claim 2, characterized in that: The induction block and the spring seat are both provided with limiting protrusions for the spring to be inserted.

4. The superimposed pressure switch according to claim 1, characterized in that: The sensing block is provided with a limiting groove for the push rod to be inserted into.

5. The superimposed pressure switch according to claim 1, characterized in that: Also includes: damping plug; The damping plug is disposed in the first flow channel and is used to reduce the impact force of the hydraulic oil on the push rod.

6. The superimposed pressure switch according to claim 1, characterized in that: Also includes: a first O-ring, a second O-ring, and a third O-ring; The first O-type sealing ring is sleeved on the push rod and is used to abut against the side cover; The second O-ring and the third O-ring are arranged on the side cover and are used to abut against the valve body.

7. The superimposed pressure switch according to claim 6, characterized in that: Also includes: Screw plug; The valve body is provided with a second flow channel; The side cover is provided with an oil drain channel; The push rod is provided with an oil drain groove, which is located between the valve body and the first O-ring and is connected to the T-port through the oil drain channel and the second flow channel; The screw plug is arranged on the side cover and is used to block the communication between the oil drain channel and the atmosphere.

8. The superimposed pressure switch according to claim 1, characterized in that: The valve body is provided with a first mounting plane and a second mounting plane on opposite sides thereof; The inlet and outlet openings of the P port, the A port, the B port, and the T port are all located on the first installation plane and the second installation plane.

9. The superimposed pressure switch according to claim 1, characterized in that: The valve body is provided with a plurality of fixing holes for installing and fixing the valve body.

10. The superimposed pressure switch according to claim 1, characterized in that: The side cover is provided with a mounting hole; The valve body is provided with threaded holes so that the side cover is fixed to the valve body by fixing bolts.

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