Flush valve

Abstract

The utility model discloses a flush valve which comprises a valve body, an electromagnetic valve, a pressure sensing assembly and a control circuit board, a pressure sensing channel is arranged on one side of the valve body, the pressure sensing assembly comprises a piston rod, an elastic piece and a first microswitch, and water pressure in the pressure sensing channel can drive the piston rod to compress the elastic piece to move from a first position to a second position. A first touch protrusion is arranged on the piston rod, when the piston rod moves to a first position, the first touch protrusion can trigger the first microswitch, and the control circuit board is configured to automatically adjust the opening duration of the electromagnetic valve when receiving a trigger signal of the first microswitch. Static pressure of the water inlet end of the flushing valve is reflected through the stroke of the piston rod pushed by water pressure, when the piston rod moves to a first position along with pressure rise, the first touch protrusion triggers the first microswitch, the first microswitch sends a signal to the control circuit board, the opening duration of the electromagnetic valve is adjusted to a preset value, and the flushing valve is opened. And the flushing flow meets the water efficiency requirement.

Description

TECHNICAL FIELD

[0001] The utility model relates to a flushing valve technical field, in particular to a flushing valve. BACKGROUND

[0002] The structure of the existing induction flushing valve is all through the electromagnetic valve control diaphragm valve or piston valve's opening and closing, and its flushing time depends on the current pipeline water pressure and the preset start and stop time of the electromagnetic valve, the flushing time and flow of the flushing valve are greatly influenced by water pressure fluctuation, leading to inconsistent flushing effect under different water pressure conditions. The existing flushing valve standard requires to meet the water efficiency requirement under 0.24MPa and 0.55MPa pressure at the same time, but the current technology is difficult to meet the water efficiency requirement under low pressure and high pressure conditions. SUMMARY

[0003] The utility model discloses at least one of the above technical problems in the related art is solved to some extent. To this end, the utility model provides a flushing valve.

[0004] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0005] According to the flushing valve of the utility model embodiment, comprising:

[0006] The valve body has a water inlet end, a water outlet end and a water passing cavity communicating the water inlet end and the water outlet end, and a pressure sensing channel is arranged on one side of the valve body, and the pressure sensing channel is communicated with the water inlet end.

[0007] The electromagnetic valve is used for controlling the on-off of the water passing cavity.

[0008] The valve body has a water inlet end, a water outlet end and a water passing cavity communicating the water inlet end and the water outlet end, and a pressure sensing channel is arranged on one side of the valve body, and the pressure sensing channel is communicated with the water inlet end.

[0009] The electromagnetic valve is used for controlling the on-off of the water passing cavity.

[0010] The pressure sensing assembly comprises a piston rod, an elastic member and a first micro switch, the piston rod is arranged in the pressure sensing channel and is arranged along the axial direction of the pressure sensing channel, the water pressure in the pressure sensing channel can drive the piston rod to compress the elastic member and move from a first position to a second position, a first touch protrusion is arranged on the piston rod, and the first touch protrusion can trigger the first micro switch when the piston rod moves to the first position.

[0011] The control circuit board is electrically connected with the electromagnetic valve and the first micro switch, and the control circuit board is configured to automatically adjust the opening time of the electromagnetic valve when receiving the trigger signal of the first micro switch.

[0012] The flushing valve has at least the following beneficial effects:

[0013] 1、The utility model discloses a piston rod is pushed to the stroke of water pressure to reflect the static pressure of the water inlet end of flushing valve, and water enters the pressure sensing channel, when the pressure rises to the set value, water pressure pushes the piston rod, and the piston rod compresses elastic member and moves, when the piston rod moves to the first position with the pressure rising, it indicates that high pressure state has been reached, and the first touch protrusion triggers the first microswitch, and the first microswitch sends a signal to the control circuit board, adjusts the opening time length of solenoid valve, adjusts the opening time length of solenoid valve to the preset value, guarantees that the flushing flow meets the water efficiency requirement.

[0014] 2、The utility model discloses a solenoid valve opening time length can be adjusted through different water pressure, and the opening time length is shorter when the pressure is high, and the solenoid valve can reach the peak value of flushing flow quickly, reduces total water consumption simultaneously, reaches the purpose of water saving, and the opening time length is longer when the pressure is low, and enough time can be provided for the solenoid valve to reach the peak value of flushing flow, guarantees the flushing performance and water saving performance.

[0015] According to some embodiments of the utility model, the pressure sensing assembly further includes a second microswitch, the first microswitch and the second microswitch are arranged along the axial direction of the piston rod, the piston rod is provided with a second touch protrusion, the second touch protrusion can trigger the second microswitch when the piston rod moves to the second position, and the first touch protrusion can continuously trigger the first microswitch during the movement of the piston rod from the first position to the second position.

[0016] According to some embodiments of the utility model, the water inlet end and the water outlet end are located on the same axis, and the angle β between the axis of the pressure sensing channel and the water outlet direction of the valve body is ≤45°.

[0017] According to some embodiments of the utility model, the pressure sensing assembly further includes a shell, the shape of the shell is matched with the inner wall of the pressure sensing channel, the shell is embedded in the pressure sensing channel, and the water inlet channel and the piston cavity are formed in the shell and are connected.

[0018] According to some embodiments of the utility model, the shell includes first casing and second casing, the water inlet channel is established on the first casing, the front half of the piston cavity is established on the first casing, the back half is established on the second casing, the rear end of the first casing is butt joint with the front end of the second casing, constitutes the complete piston cavity, the outer peripheral wall of the first casing is adapted with the inner wall of the pressure response channel, the first casing is embedded in the pressure response channel, the second casing is detachably installed outside the pressure response channel, the first micro -switch and second micro -switch are installed on the second casing.

[0019] According to some embodiments of the utility model, the front end of the second casing outer wall is equipped with first lug, the rear end of the pressure response channel is equipped with installation cavity, the rear end of the installation cavity inner wall is equipped with second lug, the second lug and the front end of the installation cavity form annular space that can supply the first lug circumferential motion, the second casing can be inserted into the installation cavity and rotate from third position to fourth position, when the third position, the first lug and second lug are mutually staggered in axial direction, and the first lug is located in the annular space, when the fourth position, the first lug and second lug are mutually opposite in axial direction.

[0020] According to some embodiments of the utility model, the first lug is the L-shaped structure that is composed of slider part and limit part, the slider part is set along the circumference of the second casing, the limit part is set along the axial direction of the second casing, and the limit part is connected to the rear side of the slider part, when the fourth position, the slider part and second lug are mutually opposite in axial direction, the limit part and second lug are in abutment in circumferential direction.

[0021] According to some embodiments of the utility model, the front end of the piston rod is equipped with flange, the inner wall of the piston cavity is equipped with limit step, the elastic member is spring, the spring is sleeved on the piston rod, and the spring is abutted between the flange and the limit step, the piston rod will be pre -tightening force of the spring in initial state, the direction of the pre -tightening force is opposite with the water inlet direction of the pressure response channel.

[0022] According to some embodiments of the utility model, the outside of the second casing is equipped with containing cavity, the first micro -switch, second micro -switch and control circuit board are placed in the containing cavity, the first micro -switch and second micro -switch are equipped on the control circuit board, the bottom of the containing cavity is opened with the through -hole that is communicated the piston cavity, to supply the contact of micro -switch to extend into the piston cavity, the top cover of the containing cavity is equipped with the cover, the containing cavity is also equipped with rubber pad, the rubber pad is clamped between the cover and the circuit board.

[0023] According to some embodiments of the present invention, the outer peripheral wall of the outer shell is fitted with a sealing ring, and the sealing ring abuts against the space between the outer shell and the inner wall of the pressure sensing channel.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of the overall structure of the flushing valve of this utility model;

[0027] Figure 2 This is a schematic diagram of the pressure sensing component of this utility model;

[0028] Figure 3 This is a cross-sectional view of the flushing valve of this utility model;

[0029] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0030] Figure 5 This is a schematic diagram of the mounting cavity of this utility model;

[0031] Figure 6 yes Figure 3 Cross-sectional view at point AA;

[0032] Figure 7 This is a cross-sectional view of the valve body of this utility model.

[0033] Reference numerals: Valve body 100, inlet end 110, outlet end 120, water passage cavity 130, pressure sensing channel 140, mounting cavity 150, second protrusion 151, solenoid valve 200, pressure sensing assembly 300, piston rod 310, first actuating protrusion 311, second actuating protrusion 312, flange 313, elastic element 320, first micro switch 330, second micro switch 340, first housing 350, water inlet channel 351, piston cavity 352, second housing 360, first protrusion 361, slider part 362, limiting part 363, limiting step 364, receiving cavity 365, cover 370, rubber gasket 380, sealing ring 390, control circuit board 400. Detailed Implementation

[0034] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0035] In the description of the present application, it should be understood that the terms "front", "back" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0036] Referring to Figures 1-7 An inductive flushing valve, comprising:

[0037] A valve body 100 has a water inlet end 110, a water outlet end 120, and a water passing cavity 130 communicating the water inlet end 110 and the water outlet end 120, and a pressure sensing channel 140 is arranged on one side of the valve body 100, and the pressure sensing channel 140 is in communication with the water inlet end 110;

[0038] A solenoid valve 200 is used to control the on-off of the water passing cavity 130;

[0039] A pressure sensing assembly 300 comprises a piston rod 310, an elastic member 320 and a first micro switch 330, the piston rod 310 is arranged in the pressure sensing channel 140 and is arranged along the axial direction of the pressure sensing channel 140, the elastic member 320 provides the piston rod 310 with an axial elastic force, the direction of the elastic force is opposite to the water inlet direction of the pressure sensing channel 140, the water pressure in the pressure sensing channel 140 can drive the piston rod 310 to compress the elastic member 320 and move from a first position to a second position, the water pressure borne by the piston rod 310 when it is located at the first position is less than the water pressure borne by the piston rod 310 when it is located at the second position, a first touch protrusion 311 is arranged on the piston rod 310, and the first touch protrusion 311 can trigger the first micro switch 330 when the piston rod 310 moves to the first position;

[0040] A control circuit board 400 is electrically connected with the solenoid valve 200 and the first micro switch 330, and the control circuit board 400 is configured to automatically adjust the opening time of the solenoid valve 200 when receiving the trigger signal of the first micro switch 330.

[0041] Working principle: The elastic member 320 is set to remain uncompressed when the water pressure is ≤0.3 MPa, and water enters the pressure sensing channel 140. When the pressure rises to >0.3 MPa, the water pressure pushes the piston rod 310, which compresses the elastic member 320 and moves. When the pressure rises to 0.55 MPa, the first touch protrusion 311 triggers the first micro switch 330, which sends a signal to the control circuit board 400 to adjust the opening time of the electromagnetic valve 200. The opening time of the electromagnetic valve 200 is adjusted to a preset value to ensure that the flushing volume under the current water pressure state is basically consistent with the flushing water efficiency level under a pressure of ≤0.3 MPa.

[0042] It can be understood that the number of first micro switches 330 is not limited to one, and more than two first micro switches 330 can be provided and distributed along the axial direction of the piston rod 310. Each first micro switch 330 corresponds to a preset electromagnetic valve 200 opening time, so that a pressure range corresponds to an electromagnetic valve 200 opening time. The first touch protrusion 311 can trigger the corresponding first micro switch 330 under the current water pressure as the water pressure rises, forming more precise water volume control in multiple pressure ranges.

[0043] In some embodiments of the utility model, pressure sensing assembly 300 further includes second micro switch 340, first micro switch 330 and second micro switch 340 are arranged along the axial direction of piston rod 310, piston rod 310 is equipped with second touch protrusion 312, when piston rod 310 moves to second position, second touch protrusion 312 can trigger second micro switch 340, in the process that piston rod 310 moves from first position to second position, first touch protrusion 311 can continuously trigger first micro switch 330. When piston rod moves to second position (such as pressure rises to 2.6MPa) with pressure, it indicates that overpressure state has been reached, second touch protrusion 312 triggers second micro switch 340, second micro switch 340 sends signal to control circuit board 400, control circuit board 400 controls electromagnetic valve 200 to carry out one-time start-stop pressure relief operation, prevents high pressure damage or frost crack, improves the anti-freezing ability of flush valve, when water pressure restores, piston rod 310 resets under the action of elastic member 320, and second micro switch 340 is disconnected. The axial length of first touch protrusion 311 is designed according to the stroke length from first position to second position, to ensure that first micro switch 330 can be continuously triggered when water pressure is 0.55MPa, when water pressure drops below 0.55MPa, piston rod 310 resets under the action of elastic member 320, and first micro switch 330 is disconnected, at this time, the program adjusts the opening time of electromagnetic valve 200 to the initial setting time. It should be noted that between first position and second position, the system executes the program of adjusting the opening time of electromagnetic valve 200, at this time, the opening time of electromagnetic valve 200 is always the preset time corresponding to first micro switch 330, until piston rod 310 reaches second position, and second micro switch 340 is triggered, at this time, even if first micro switch 330 is still triggered, the system will still execute the pressure relief protection program corresponding to second micro switch 340.

[0044] In some embodiments of the utility model, as shown in Figure 7 The water inlet end 110 and the water outlet end 120 are located on the same axis, and the angle β between the axis of the pressure sensing channel 140 and the water outlet direction of the valve body 100 is ≤45°. Smaller angle can ensure that the water flow pressure acts more directly on the axial direction of the piston rod 310, reducing pressure loss or energy dispersion caused by water flow direction deviation. When the water pressure changes, the piston rod 310 can respond more sensitively.

[0045] In some embodiments of the utility model, pressure sensing assembly 300 further includes a shell, the shape of shell is matched with the inner wall of pressure sensing channel 140, shell is embedded in pressure sensing channel 140, water inlet channel 351 and piston cavity 352 that are communicated are formed in shell, water inlet channel 351 is communicated with pressure sensing channel 140, the inner diameter of piston cavity 352 is greater than the inner diameter of water inlet channel 351, piston rod 310 is placed in piston cavity 352. Shell is used as carrier, piston rod 310, elastic member 320, micro switch and other components are integrated in shell, make pressure sensing assembly 300 become independent module embedded in valve body 100, it is convenient to assemble during production, also simplify the replacement process during maintenance.

[0046] In some embodiments of the utility model, shell includes first shell body 350 and second shell body 360, water inlet channel 351 is arranged on first shell body 350, the front half of piston cavity 352 is arranged on first shell body 350, and the rear half is arranged on second shell body 360, the rear end of first shell body 350 is butted with the front end of second shell body 360, to form complete piston cavity 352, the outer peripheral wall of first shell body 350 is matched with the inner wall of pressure sensing channel 140, first shell body 350 is embedded in pressure sensing channel 140, second shell body 360 is detachably installed outside pressure sensing channel 140, first micro switch 330 and second micro switch 340 are installed on second shell body 360. The inner wall of pressure sensing channel 140 is formed with a stepped surface for axial positioning of first shell body 350. The split design of shell makes the installation of each component more convenient, for example, piston rod 310 can be first installed in the front half of the piston cavity 352 of first shell body 350, and then second shell body 360 is butted with first shell body 350 to complete the assembly of the entire pressure sensing assembly 300. Second shell body 360 is detachably installed outside pressure sensing channel 140, when the micro switch and other components fail, second shell body 360 can be directly disassembled for maintenance or replacement, without the need to disassemble the entire flush valve, reducing maintenance time and cost.

[0047] In some embodiments of the utility model, the front end of the outer wall of second shell 360 is equipped with first lug 361, the rear end of pressure sensing channel 140 is equipped with mounting cavity 150, the rear end of the inner wall of mounting cavity 150 is equipped with second lug 151, annular space is formed between second lug 151 and the front end of mounting cavity 150 for the circumferential movement of first lug 361, second shell 360 can be inserted into mounting cavity 150 and rotated from third position to fourth position, when in third position, first lug 361 and second lug 151 are axially misaligned with each other, and first lug 361 is located in annular space, when in fourth position, first lug 361 and second lug 151 are axially aligned with each other. Further, the inner diameter of mounting cavity 150 is larger than the inner diameter of pressure sensing channel 140, annular space allows first lug 361 to move (i.e. rotate) within the circumferential range, but limits its axial displacement. When in third position, second shell 360 is in unlocked state, and second shell 360 can be freely inserted into or withdrawn from mounting cavity 150; when in fourth position, it is in locked state, after rotating to lug alignment, the two lugs form an axial block, preventing second shell 360 from moving axially, thereby realizing the function of "rotating to position and locking", and when maintaining, second shell 360 can be easily pulled out by rotating to third position (lug misalignment), facilitating disassembly and assembly.

[0048] In some embodiments of the utility model, first lug 361 is L-shaped structure composed of sliding block part 362 and limiting part 363, sliding block part 362 is arranged along the circumference of second shell 360, limiting part 363 is arranged along the axis of second shell 360, and limiting part 363 is connected to the rear side of sliding block part 362, when in fourth position, sliding block part 362 and second lug 151 are axially aligned with each other, and limiting part 363 abuts against second lug 151 in the circumferential direction. Limiting part 363 abuts against second lug 151 in the circumferential direction, limiting the rotational freedom of second shell 360, and ensuring rotation to position.

[0049] In some embodiments of the utility model, the front end of piston rod 310 is equipped with flange 313, the inner wall of piston cavity 352 is equipped with limiting step 364, elastic member 320 is spring, spring is sleeved on piston rod 310, and spring abuts between flange 313 and limiting step 364, piston rod 310 will be pre-tightened by spring in initial state, and the direction of pre-tightening force is opposite to the water inlet direction of pressure sensing channel 140. Spring is initially set to remain unchanged when water pressure is less than or equal to 0.3MPa, and spring starts to compress when water pressure is greater than 0.3MPa, and the pre-tightening force of spring ensures that piston rod 310 is stably located in initial position under low water pressure.

[0050] In some embodiments of the utility model, the outer side of second shell 360 is equipped with containing cavity 365, first micro switch 330, second micro switch 340 and control circuit board 400 are placed in containing cavity 365, first micro switch 330 and second micro switch 340 are equipped on control circuit board 400, the bottom of containing cavity 365 is opened with the through -hole that communicates piston cavity 352, to supply the contact of micro switch to stretch into piston cavity 352, the top cover of containing cavity 365 is equipped with sealing cover 370, containing cavity 365 is also equipped with rubber pad 380, and rubber pad 380 is clamped between sealing cover 370 and circuit board.Rubber pad 380 is used for buffering when touching convex and touching micro switch, prevents control circuit board 400 from being damaged.

[0051] In some embodiments of the utility model, the outer peripheral wall of the shell is sleeved with a sealing ring 390, and the sealing ring 390 is abutted between the shell and the inner wall of the pressure sensing channel 140. The sealing ring 390 can compensate for the assembly tolerance of the first shell 350 and the pressure sensing channel 140, preventing water from leaking through the gap between the first shell 350 and the pressure sensing channel 140.

[0052] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A flush valve characterized by, The utility model relates to a valve body (100) with a water inlet end (110), a water outlet end (120) and a water passing cavity (130) connecting the water inlet end (110) and the water outlet end (120), one side of the valve body (100) is equipped with a pressure sensing channel (140), the pressure sensing channel (140) is communicated with the water inlet end (110). An electromagnetic valve (200) is used to control the opening and closing of the water passing cavity (130). A pressure sensing assembly (300) includes a piston rod (310), an elastic element (320) and a first micro switch (330), the piston rod (310) is arranged in the pressure sensing channel (140) and is arranged along the axial direction of the pressure sensing channel (140), the water pressure in the pressure sensing channel (140) can drive the piston rod (310) to compress the elastic element (320) to move from a first position to a second position, the piston rod (310) is provided with a first touch protrusion (311), when the piston rod (310) moves to the first position, the first touch protrusion (311) can trigger the first micro switch (330). A control circuit board (400) is electrically connected with the electromagnetic valve (200) and the first micro switch (330), the control circuit board (400) is configured to automatically adjust the opening time of the electromagnetic valve (200) when receiving the trigger signal of the first micro switch (330). The pressure sensing assembly (300) further includes a second micro switch (340), the first micro switch (330) and the second micro switch (340) are arranged along the axial direction of the piston rod (310), the piston rod (310) is provided with a second touch protrusion (312), when the piston rod (310) moves to the second position, the second touch protrusion (312) can trigger the second micro switch (340), during the movement of the piston rod (310) from the first position to the second position, the first touch protrusion (311) can continuously trigger the first micro switch (330).

2. The flush valve of claim 1, wherein The water inlet end (110) and the water outlet end (120) are located on the same axis, the angle β between the axis of the pressure sensing channel (140) and the water outlet direction of the valve body (100) is less than or equal to 45 degrees.

3. The flush valve of claim 1, wherein The pressure sensing assembly (300) further includes a shell, the shape of the shell is matched with the inner wall of the pressure sensing channel (140), the shell is embedded in the pressure sensing channel (140), a water inlet channel (351) and a piston cavity (352) are formed in the shell and are communicated, the water inlet channel (351) is communicated with the pressure sensing channel (140), the inner diameter of the piston cavity (352) is greater than the inner diameter of the water inlet channel (351), the piston rod (310) is arranged in the piston cavity (352).

4. The flush valve of claim 2, wherein ​ 5. The flush valve of claim 4, wherein The outer shell comprises a first shell (350) and a second shell (360), the water inlet channel (351) is arranged on the first shell (350), the front half of the piston cavity (352) is arranged on the first shell (350), and the rear half is arranged on the second shell (360), the rear end of the first shell (350) is connected with the front end of the second shell (360) to form a complete piston cavity (352), the outer peripheral wall of the first shell (350) is matched with the inner wall of the pressure sensing channel (140), the first shell (350) is embedded in the pressure sensing channel (140), and the second shell (360) is detachably arranged outside the pressure sensing channel (140). The first micro switch (330) and the second micro switch (340) are arranged on the second shell (360).

6. The flush valve of claim 5, wherein The front end of the outer wall of the second shell (360) is provided with a first protrusion (361), the rear end of the pressure sensing channel (140) is provided with a mounting cavity (150), the rear end of the inner wall of the mounting cavity (150) is provided with a second protrusion (151), the second protrusion (151) and the front end of the mounting cavity (150) form an annular space for the circumferential movement of the first protrusion (361), and the second shell (360) can be inserted into the mounting cavity (150) and rotated from a third position to a fourth position. In the third position, the first protrusion (361) and the second protrusion (151) are axially misaligned with each other, and the first protrusion (361) is located in the annular space. In the fourth position, the first protrusion (361) and the second protrusion (151) are axially aligned with each other.

7. The flush valve of claim 6, wherein The first protrusion (361) is an L-shaped structure composed of a sliding block part (362) and a limiting part (363), the sliding block part (362) is arranged along the circumference of the second shell (360), the limiting part (363) is arranged along the axis of the second shell (360), and the limiting part (363) is connected to the rear side of the sliding block part (362). In the fourth position, the sliding block part (362) and the second protrusion (151) are axially aligned with each other, and the limiting part (363) and the second protrusion (151) are circumferentially abutted.

8. A flush valve according to claim 4 or 5, characterised in that, The front end of the piston rod (310) is provided with a flange (313), the inner wall of the piston cavity (352) is provided with a limiting step (364), the elastic member (320) is a spring, the spring is sleeved on the piston rod (310), and the spring abuts between the flange (313) and the limiting step (364). The piston rod (310) is pre-tightened by the spring in the initial state, and the direction of the pre-tightening force is opposite to the water inlet direction of the pressure sensing channel (140).

9. The flush valve of claim 5 wherein, The outer side of the second shell (360) is provided with a containing cavity (365), the first micro switch (330), the second micro switch (340) and the control circuit board (400) are placed in the containing cavity (365), the first micro switch (330) and the second micro switch (340) are arranged on the control circuit board (400), the bottom of the containing cavity (365) is provided with a through hole communicating with the piston cavity (352), so that the contact of the micro switch extends into the piston cavity (352), the top of the containing cavity (365) is provided with a cover (370), and the containing cavity (365) is further provided with a rubber pad (380), the rubber pad (380) is clamped between the cover (370) and the circuit board.

10. The flush valve of claim 4 wherein, The outer peripheral wall of the shell is sleeved with a sealing ring (390), and the sealing ring (390) abuts between the shell and the inner wall of the pressure sensing channel (140).

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