Flow adjustable hand operated diaphragm valve

Abstract

The application discloses a flow-adjustable manual diaphragm valve and relates to the technical field of valves.The flow-adjustable manual diaphragm valve comprises a valve body, a flow path, a diaphragm, a valve rod, a driving seat, an adjusting groove, an adjusting seat and an adjusting cavity, the valve rod is arranged in the adjusting cavity along the axial direction of the valve rod, one end of the valve rod away from the diaphragm is provided with a positioning part, and the opposite ends of the adjusting cavity are respectively provided with positioning walls for resisting the positioning part, and the two positioning walls are arranged along the axial direction of the valve rod.The manual diaphragm valve can adjust the moving stroke of the valve rod by positioning the positioning part through the two positioning walls, thereby adjusting the opening height and the closing height of the diaphragm, and further realizing the accurate flow adjustment of the manual diaphragm valve; meanwhile, the two positioning walls can position the valve rod, so that the adjusted flow remains constant.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a flow-adjustable manual diaphragm valve. BACKGROUND

[0002] The manual diaphragm valve is a diaphragm valve driven by a hand wheel, which is frequently used in food and pharmaceutical industries.

[0003] However, the existing manual diaphragm valve can only be kept in a fully open or fully closed state during use, and cannot adjust the flow according to the specific pipeline working condition, which greatly limits the application of the manual diaphragm valve in some special pipeline working conditions. Meanwhile, the manual diaphragm valve may encounter unexpected situations such as vibration, impact and misoperation during use, which may cause abnormal changes in the valve opening degree, thereby greatly affecting the normal operation of the pipeline working condition. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the present application provides a flow-adjustable manual diaphragm valve.

[0005] The manual diaphragm valve provided by the present application adopts the following technical scheme:

[0006] A flow-adjustable manual diaphragm valve, comprising a valve body, a flow path formed in the valve body, a diaphragm arranged in the valve body for opening and closing the flow path, a valve rod arranged for pressing the diaphragm and movable along the direction close to or away from the diaphragm, a drive seat arranged on the valve body for driving the valve rod to move, the manual diaphragm valve further comprises an adjusting groove formed in the drive seat, an adjusting seat arranged in the adjusting groove and movable along the axial direction of the valve rod, and an adjusting cavity formed in the adjusting seat, the valve rod is arranged in the adjusting cavity along the axial direction, one end of the valve rod away from the diaphragm has a positioning portion, and the opposite ends of the adjusting cavity respectively have positioning walls for resisting the positioning portion, and the two positioning walls are arranged along the axial direction of the valve rod.

[0007] By adopting the above technical scheme, the operator can change the position of the adjusting seat as needed to adjust the moving stroke of the valve rod through the positioning of the two positioning walls on the positioning portion, so as to adjust the opening height and closing height of the diaphragm, and then realize the precise flow adjustment of the manual diaphragm valve. Meanwhile, the two positioning walls can position the valve rod to keep the adjusted flow constant.

[0008] Preferably, the two sides of the positioning portion are respectively provided with a buffer sleeve, the buffer sleeve is arranged to be expandable along the axial direction, the two positioning walls are respectively provided with a buffer groove corresponding to the two buffer sleeves, and the projections of the two buffer sleeves on the two positioning walls respectively coincide with the two buffer grooves.

[0009] By adopting the technical scheme, the buffering between the positioning part and the two positioning walls can be realized through the expansion and contraction cooperation between the buffering sleeve and the buffering groove, so that the positioning part is prevented from directly impacting on the positioning walls to affect the movement of the valve rod.

[0010] Preferably, the diameter of each buffering sleeve gradually increases along the direction from the positioning part to the corresponding buffering groove.

[0011] By adopting the technical scheme, the expansion and contraction stability of the buffering sleeve is effectively improved, and the buffering sleeve is prevented from being deflected during expansion and contraction.

[0012] Preferably, the adjusting seat comprises a first seat body movably arranged in the adjusting groove along the axial direction of the valve rod, a seat groove formed on the first seat body, and a second seat body movably arranged in the seat groove, the moving direction of the second seat body is the same as that of the first seat body, and the adjusting cavity is formed between the first seat body and the second seat body.

[0013] By adopting the technical scheme, the distance between the two positioning walls can be adjusted through the relative movement of the first seat body and the second seat body, which not only effectively increases the stroke adjustment range of the valve rod, but also enables the operator to independently adjust the opening height and the closing height of the manual diaphragm valve to adapt to more pipeline working conditions.

[0014] Preferably, the driving seat has a rotating part rotationally connected with the valve body, the extending direction of the rotating axis of the rotating part is the same as the axial direction of the valve rod, a plurality of limiting grooves are arranged on the outer circumferential side of the rotating part at intervals, a telescopic limiting rod is arranged on the valve body, the telescopic direction of the limiting rod is perpendicular to the extending direction of the rotating axis of the rotating part, and the limiting rod can be selectively inserted into the plurality of limiting grooves.

[0015] By adopting the technical scheme, the rotating part can be kept at the corresponding rotating position under the cooperation of the limiting rod and the limiting groove, so that abnormal rotation of the rotating part caused by vibration, impact, misoperation and the like is avoided, thereby avoiding the influence of abnormal movement of the valve rod on the opening degree of the valve.

[0016] Preferably, the valve body is provided with a limiting seat, the limiting rod is slidably arranged in the limiting seat along the axial direction, the limiting seat is provided with a first elastic member, one end of the limiting rod away from the rotating part is arranged in the first elastic member and connected with the first elastic member, the limiting seat is further provided with an unlocking module for driving the limiting rod away from the rotating part, the unlocking module comprises an unlocking column movably arranged in the limiting seat along the direction perpendicular to the limiting rod, the end of the unlocking column is provided with a first inclined surface, the side of the limiting rod is provided with a first matching groove, the groove bottom of the first matching groove is provided with a second inclined surface, the first inclined surface and the second inclined surface are in abutment, and the first inclined surface and the second inclined surface are respectively inclined to the direction close to the rotating part along the direction from the unlocking column to the limiting rod.

[0017] By adopting the above technical scheme, the limiting rod can be closely inserted into the limiting groove under the action of the first elastic member, and the insertion strength of the limiting rod in the limiting groove is effectively improved; at the same time, the operator can conveniently release the locking of the rotating part by the limiting rod through the cooperation of the unlocking column and the first matching groove, and the operator can conveniently adjust the opening of the diaphragm.

[0018] Preferably, the slot opening of the limiting groove is provided with a guide ring, the guide ring comprises a plurality of guide portions arranged around the circumference of the limiting groove, each guide portion is respectively provided with an arc-shaped guide surface, and a gap slot is formed between each adjacent two guide portions.

[0019] By adopting the above technical scheme, the arc-shaped guide surface and the gap slot can reduce the insertion resistance of the limiting rod, reduce the insertion difficulty of the limiting rod in the limiting groove, and make the first elastic member smoothly drive the limiting rod to be inserted into the limiting groove; at the same time, the plurality of guide portions can abut against the limiting rod from the circumferential side of the limiting rod, so that the relative shaking between the limiting rod and the rotating part is avoided.

[0020] Preferably, the opposite two side walls of the limiting groove are respectively provided with retractable limiting blocks, the end of the limiting rod is provided with a limiting head, the two limiting blocks are respectively abutted against the two sides of the limiting rod, and the limiting cavity for accommodating the limiting head is formed between the two limiting blocks and the limiting groove.

[0021] By adopting the above technical scheme, when the limiting rod is inserted into the limiting groove, the two limiting blocks can respectively clamp the limiting rod and abut against the rear end of the limiting head, so that the insertion strength of the limiting rod in the limiting groove is effectively improved, and the limiting rod is prevented from being separated from the limiting groove to cause the limiting failure.

[0022] Preferably, the limiting head is spherical, and the two limiting blocks are combined into a limiting part, and the limiting part is provided with a second matching groove matched with the limiting head on the side of the limiting head and the side opposite to the limiting head, respectively.

[0023] By adopting the above technical scheme, the two limiting blocks can be smoothly separated under the cooperation of the spherical limiting head and the two second matching grooves, and the limiting rod is facilitated to be inserted into the limiting slot.

[0024] Preferably, the two limiting blocks are respectively provided with a clamping groove on the end face close to each other, and the two clamping grooves are respectively clamped on the two side parts of the limiting rod.

[0025] By adopting the above technical scheme, the insertion strength of the limiting rod in the limiting slot is further improved.

[0026] In summary, the present application has at least one of the following beneficial technical effects:

[0027] The operator can change the position of the adjusting seat according to the need, so as to adjust the moving stroke of the valve rod by positioning the positioning part through the two positioning walls, so as to adjust the opening height and the closing height of the diaphragm, and then realize the precise flow regulation of the manual diaphragm valve; at the same time, the two positioning walls can position the valve rod, so that the adjusted flow remains constant. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic view of the three-dimensional structure of the manual diaphragm valve in the embodiment of the present application;

[0029] Figure 2 is a schematic view of the longitudinal section of the manual diaphragm valve in the embodiment of the present application;

[0030] Figure 3 is Figure 2 is an enlarged schematic view of A in

[0031] Figure 4 is an enlarged schematic view of B in Figure 2 .

[0032] Markings in the drawings:

[0033] 1, valve body; 2, flow path; 3, diaphragm; 4, valve rod; 5, drive seat; 5a, rotating part; 5b, hand wheel; 6, adjusting groove; 7, adjusting seat; 7a, first seat body; 7b, second seat body; 8, adjusting cavity; 8a, first positioning wall; 8b, second positioning wall; 9, positioning part; 10, buffer sleeve; 11, buffer groove; 12, limiting groove; 13, limiting rod; 13a, limiting head; 14, limiting seat; 15, first elastic member; 16, unlocking module; 16a, unlocking column; 16b, first inclined surface; 17, first matching groove; 17a, second inclined surface; 18, guide ring; 18a, guide part; 18b, accommodation groove; 19, limiting block; 20, limiting cavity; 21, second matching groove; 22, clamping groove; 23, groove cover; 24, mounting groove; 25, second elastic member. DETAILED DESCRIPTION

[0034] The following will be described in detail in combination with the accompanying drawings. Figures 1-4 The application will be further described.

[0035] In the description of the application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the application and simplifying the description, and cannot be understood as a limitation on the application.

[0036] Referring to Figures 1-4 shown, a flow-adjustable manual diaphragm valve is shown, which comprises a valve body 1, a flow path 2 opened in the valve body 1, a deformable diaphragm 3 arranged in the valve body 1 for opening and closing the flow path 2, a valve rod 4 arranged for pressing the diaphragm 3 and movable along the direction close to or away from the diaphragm 3, and a drive seat 5 arranged on the valve body 1 for driving the valve rod 4 to move. Among them, the diaphragm 3 can deform along the up-down direction, the valve rod 4 extends along the vertical direction and its lower end is connected with the diaphragm 3, the drive seat 5 is rotationally connected with the upper end of the valve body 1, and the valve rod 4 is arranged in the drive seat 5 and is threadedly connected with the drive seat 5. By rotating the drive seat 5, the valve rod 4 can move along the vertical direction under the thread cooperation of the drive seat 5 and drive the diaphragm 3 to open and close.

[0037] In this embodiment, in combination Figure 2 shown, the manual diaphragm valve further comprises an adjusting groove 6 opened on the drive seat 5, an adjusting seat 7 movably arranged in the adjusting groove 6 along the vertical direction, and an adjusting cavity 8 opened in the adjusting seat 7, the valve rod 4 is arranged in the adjusting cavity 8 along its axial direction, the end of the valve rod 4 away from the diaphragm 3 has a positioning part 9, the positioning part 9 is annular and is sleeved on the valve rod 4, and the upper and lower ends of the adjusting cavity 8 respectively have positioning walls for resisting the positioning part 9.

[0038] The adjusting seat 7 is threadedly connected with the groove wall of the adjusting groove 6. When an operator rotates the adjusting seat 7, the adjusting seat 7 can move along the vertical direction under the thread cooperation of the adjusting groove 6, and the positioning walls at the upper and lower ends of the adjusting cavity 8 can also move along with the adjusting seat 7. In this way, the abutting positions of the positioning part 9 on the valve rod 4 and the two positioning walls can also change. That is to say, the moving stroke of the valve rod 4 can change along with the movement of the adjusting seat 7, and the valve rod 4 can stop at different positions in the moving process. The valve rod 4 stopping at different positions can make the diaphragm 3 have different opening heights and closing heights, so as to realize the accurate flow regulation of the manual diaphragm valve. Meanwhile, the two positioning walls can position the valve rod 4, so as to keep the regulated flow constant. Moreover, the blocking of the valve rod 4 by the two positioning walls can avoid excessive movement of the valve rod 4, so as to prevent the diaphragm 3 from being excessively stretched, thereby prolonging the service life of the diaphragm 3.

[0039] In the process of upward movement of the valve rod 4, the diaphragm 3 is gradually opened by the valve rod 4, and the flow in the flow passage 2 gradually increases. When the positioning part 9 abuts against the first positioning wall 8a, the diaphragm 3 is at the maximum opening height, and the flow in the flow passage 2 is the largest at this time. In the process of downward movement of the valve rod 4, the diaphragm 3 is gradually closed by the valve rod 4, and the flow in the flow passage 2 gradually decreases. When the positioning part 9 abuts against the second positioning wall 8b, the diaphragm 3 is at the minimum closing height, and the flow passage 2 is completely closed at this time. Through the position adjustment of the adjusting seat 7, the maximum opening height and the minimum closing height of the diaphragm 3 can be changed, so as to accurately regulate the flow in the flow passage 2 and keep the regulated flow constant.

[0040] In the embodiment, the adjusting seat 7 is threadedly connected with the groove wall of the adjusting groove 6. Figure 2 and Figure 3 As shown in the drawings, the two sides of the positioning part 9 are respectively provided with a buffer sleeve 10 extending along the vertical direction. The buffer sleeve 10 is a bellows and is arranged to be stretchable along the axial direction. The two positioning walls are respectively provided with a buffer groove 11 corresponding to the two buffer sleeves 10. The projections of the two buffer sleeves 10 on the two positioning walls respectively coincide with the two buffer grooves 11. The diameter of each buffer sleeve 10 gradually increases along the direction from the positioning part 9 to the corresponding buffer groove 11.

[0041] When the positioning part 9 approaches the positioning wall, the buffer sleeve 10 is firstly abutted against the positioning wall and inserted into the buffer groove 11. The buffer sleeve 10 gradually shrinks in the buffer groove 11 and releases the impact force of the positioning part 9, so as to realize the buffering between the positioning part 9 and the positioning wall, and avoid the direct impact of the positioning part 9 on the positioning wall to affect the movement of the valve rod 4.

[0042] In the embodiment, the adjusting seat 7 is threadedly connected with the groove wall of the adjusting groove 6. Figure 2As shown, the adjusting seat 7 comprises a first seat body 7a movably arranged in the adjusting groove 6 along the vertical direction, a seat groove opened on the first seat body 7a, a second seat body 7b movably arranged in the seat groove, a first positioning wall 8a located at the bottom of the second seat body 7b, a second positioning wall 8b located at the bottom of the first seat body 7a, the moving direction of the second seat body 7b is the same as that of the first seat body 7a, and an adjusting cavity 8 is formed between the first seat body 7a and the second seat body 7b. Among them, the first seat body 7a is threadedly connected with the groove wall of the adjusting groove 6, and the second seat body 7b is threadedly connected with the groove wall of the seat groove.

[0043] When adjusting the adjusting seat 7, the first seat body 7a and the second seat body 7b can be screwed respectively according to the needs. Screwing the first seat body 7a can realize the movement of the second positioning wall 8b, so that the valve rod 4 can stop at different positions when descending to adjust the closing height of the diaphragm 3; screwing the second seat body 7b can realize the movement of the first positioning wall 8a, so that the valve rod 4 can stop at different positions when rising to adjust the opening height of the diaphragm 3. In this way, the first positioning wall 8a and the second positioning wall 8b can be adjusted separately according to the needs, not only can effectively increase the stroke adjusting range of the valve rod 4, but also can independently adjust the opening height and the closing height of the manual diaphragm valve to adapt to more pipeline working conditions.

[0044] Among them, the slot of the adjusting groove 6 is also provided with a slot cover 23, the slot cover 23 and the adjusting seat 7 are detachably connected through buckling, and the slot cover 23 has an inner cavity for accommodating the first seat body 7a and the second seat body 7b.

[0045] In this embodiment, the driving seat 5 comprises a rotating part 5a located in the valve body 1 and rotationally connected with the valve body 1, and a hand wheel 5b located outside the valve body 1 and coaxially connected with the rotating part 5a. The rotating part 5a is threadedly connected with the valve rod 4, and the adjusting groove 6 is coaxially opened in the hand wheel 5b. The extension direction of the rotating axis of the rotating part 5a is the same as the axial direction of the valve rod 4, a plurality of limiting grooves 12 are arranged at the outer circumferential side of the rotating part 5a, a telescopic limiting rod 13 is arranged on the valve body 1, the telescopic direction of the limiting rod 13 is perpendicular to the extension direction of the rotating axis of the rotating part 5a, and the limiting rod 13 can be selectively inserted into the plurality of limiting grooves 12.

[0046] When adjusting the flow path 2, the hand wheel 5b is rotated, the valve rod 4 moves up and down under the thread cooperation of the rotating part 5a and adjusts the opening degree of the diaphragm 3, after the adjustment is completed, the limiting rod 13 is inserted into the limiting groove 12, the rotating part 5a can be kept at the corresponding rotating position under the cooperation of the limiting rod 13 and the limiting groove 12, avoiding abnormal rotation of the rotating part 5a due to vibration, impact, misoperation and the like, so as to avoid the influence on the opening degree of the valve due to the abnormal movement of the valve rod 4.

[0047] In this embodiment, combined with Figure 2 and Figure 4 As shown, a limiting seat 14 is provided on one side of the valve body 1 in the horizontal direction. A limiting rod 13 is slidably inserted into the limiting seat 14 in the horizontal direction. A first elastic element 15 is provided on the limiting seat 14. The first elastic element 15 is a spring. The end of the limiting rod 13 away from the rotating part 5a is inserted into the first elastic element 15 and connected to the first elastic element 15. An unlocking module 16 for driving the limiting rod 13 away from the rotating part 5a is also provided on the limiting seat 14. The unlocking module 16 includes an unlocking post 16a that is movable in the vertical direction and inserted into the limiting seat 14. The end of the unlocking post 16a has a first inclined surface 16b. A first mating groove 17 is provided on the side of the limiting rod 13. The bottom of the first mating groove 17 has a second inclined surface 17a. The first inclined surface 16b abuts against the second inclined surface 17a. The first inclined surface 16b and the second inclined surface 17a are respectively inclined in the vertical direction towards the rotating part 5a.

[0048] After the limiting rod 13 is inserted into the limiting groove 12, it can be tightly positioned in the limiting groove 12 under the action of the first elastic element 15, which effectively improves the insertion strength of the limiting rod 13 in the limiting groove 12. When it is necessary to operate the opening of the diaphragm 3, simply press the unlocking post 16a. During the descent of the unlocking post 16a, the first inclined surface 16b gradually squeezes the second inclined surface 17a. During the squeezing process, the limiting rod 13 moves away from the rotating part 5a and gradually disengages from the limiting groove 12 to release the locking of the limiting rod 13 to the rotating part 5a. After the locking is released, the operator can easily adjust the opening of the diaphragm 3 normally.

[0049] In this embodiment, a guide ring 18 is connected inside the opening of the limiting groove 12. The guide ring 18 includes a plurality of guide portions 18a arranged circumferentially around the limiting groove 12. Each guide portion 18a has an arc-shaped guide surface, and a clearance groove 18b is formed between each pair of adjacent guide portions 18a. The arc-shaped guide surface and the clearance groove 18b can reduce the insertion resistance of the limiting rod 13 and reduce the difficulty of inserting the limiting rod 13 into the limiting groove 12, so that the first elastic member 15 can smoothly drive the limiting rod 13 into the limiting groove 12. At the same time, the plurality of guide portions 18a can abut against the limiting rod 13 from the periphery, preventing relative wobbling between the limiting rod 13 and the rotating part 5a.

[0050] The installation groove 24 is provided with a second elastic member 25 and a limiting block 19. The second elastic member 25 is a spring. The limiting block 19 is connected with the second elastic member 25 and can be extended and contracted under the action of the second elastic member 25. The end of the limiting rod 13 is provided with a limiting head 13a. The two limiting blocks 19 are respectively pressed against the two sides of the limiting rod 13. The two limiting blocks 19 and the limiting groove 12 form a limiting cavity 20 for accommodating the limiting head 13a. When the limiting rod 13 is inserted into the limiting groove 12, the two limiting blocks 19 can clamp the limiting rod 13 and abut against the rear end of the limiting head 13a, effectively improving the insertion strength of the limiting rod 13 in the limiting groove 12, and preventing the limiting rod 13 from being separated from the limiting groove 12 and causing the limiting failure.

[0051] The limiting head 13a is spherical. The two limiting blocks 19 are combined into a limiting part. The side of the limiting part facing the limiting head 13a and the side of the limiting part facing away from the limiting head 13a are respectively provided with a second matching groove 21 matched with the limiting head 13a. The two limiting blocks 19 can be smoothly separated under the cooperation of the spherical limiting head 13a and the two second matching grooves 21, facilitating the insertion of the limiting rod 13 in the limiting groove 12.

[0052] In the embodiment, the end face of the two limiting blocks 19 close to each other is respectively provided with a clamping groove 22 matched with the side profile of the limiting rod 13. The two clamping grooves 22 are respectively clamped on the two sides of the limiting rod 13.

[0053] The embodiments of the specific implementation are the preferred embodiments of the application, but do not limit the protection scope of the application. Therefore, any equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A flow-adjustable manual diaphragm valve comprising a valve body (1), a flow path (2) formed in the valve body (1), a diaphragm (3) provided in the valve body (1) for opening and closing the flow path (2), a valve stem (4) provided to be movable in a direction approaching or moving away from the diaphragm (3) for pressing the diaphragm (3), a driving seat (5) provided on the valve body (1) for driving the valve stem (4) to move, characterized in that: The manual diaphragm valve further comprises an adjusting groove (6) formed on the driving base (5), an adjusting base (7) movably arranged in the adjusting groove (6) along the axial direction of the valve rod (4), an adjusting cavity (8) formed in the adjusting base (7), the valve rod (4) is arranged in the adjusting cavity (8) along the axial direction, the valve rod (4) has a positioning part (9) at the end away from the diaphragm (3), and the adjusting cavity (8) has positioning walls for resisting the positioning part (9) at opposite ends, respectively. The adjusting base (7) comprises a first base body (7a) movably arranged in the adjusting groove (6) along the axial direction of the valve rod (4), a base groove formed on the first base body (7a), and a second base body (7b) movably arranged in the base groove, the moving direction of the second base body (7b) is the same as that of the first base body (7a), and the adjusting cavity (8) is formed between the first base body (7a) and the second base body (7b).

2. A flow adjustable hand operated diaphragm valve according to claim 1, characterized in that: The two sides of the positioning part (9) are respectively provided with buffer sleeves (10), the buffer sleeves (10) are arranged to be retractable along the axial direction, the two positioning walls are respectively provided with buffer grooves (11) corresponding to the two buffer sleeves (10), and the projections of the two buffer sleeves (10) on the two positioning walls respectively coincide with the two buffer grooves (11).

3. A flow adjustable hand operated diaphragm valve according to claim 2, characterized in that: The diameters of the two buffer sleeves (10) gradually increase along the direction from the positioning part (9) to the corresponding buffer groove (11), respectively.

4. The flow adjustable hand operated diaphragm valve according to claim 1, wherein: The driving base (5) has a rotating part (5a) rotationally connected with the valve body (1), the extending direction of the rotating axis of the rotating part (5a) is the same as the axial direction of the valve rod (4), the outer circumferential side of the rotating part (5a) is spaced apart and provided with a plurality of limiting grooves (12), the valve body (1) is provided with a retractable limiting rod (13), the retracting direction of the limiting rod (13) is perpendicular to the extending direction of the rotating axis of the rotating part (5a), and the limiting rod (13) can be selectively inserted into the plurality of limiting grooves (12).

5. A manually operated diaphragm valve with adjustable flow according to claim 4, characterized in that: The valve body (1) is provided with a limiting seat (14), the limiting rod (13) is slidably arranged in the limiting seat (14) along the axial direction, the limiting seat (14) is provided with a first elastic member (15), one end of the limiting rod (13) away from the rotating part (5a) is arranged in the first elastic member (15) and connected with the first elastic member (15), and the limiting seat (14) is further provided with an unlocking module (16) for driving the limiting rod (13) away from the rotating part (5a), the unlocking module (16) comprises an unlocking column (16a) movably arranged in the limiting seat (14) along the direction perpendicular to the limiting rod (13), the unlocking column (16a) has a first inclined surface (16b) at the end, the limiting rod (13) is provided with a first matching groove (17) at the side, the groove bottom of the first matching groove (17) has a second inclined surface (17a), the first inclined surface (16b) and the second inclined surface (17a) abut each other, and the first inclined surface (16b) and the second inclined surface (17a) are respectively inclined towards the rotating part (5a) along the direction from the unlocking column (16a) to the limiting rod (13).

6. A flow adjustable hand operated diaphragm valve according to claim 4, wherein: The limiting slot (12) is provided with a guide ring (18) in the slot opening, the guide ring (18) comprises a plurality of guide portions (18a) arranged in the circumferential direction of the limiting slot (12), each of the guide portions (18a) has an arc-shaped guide surface, and a gap (18b) is formed between each two adjacent guide portions (18a).

7. A flow adjustable hand operated diaphragm valve according to claim 4, wherein: The opposite two side walls of the limiting slot (12) are respectively provided with retractable limiting blocks (19), the limiting rod (13) is provided with a limiting head (13a) at the end, the two limiting blocks (19) abut the two sides of the limiting rod (13) respectively, and the two limiting blocks (19) and the limiting slot (12) form a limiting cavity (20) for accommodating the limiting head (13a).

8. A flow adjustable hand operated diaphragm valve according to claim 7, characterized in that: The limiting head (13a) is spherical, the two limiting blocks (19) are combined into a limiting part, and the side part of the limiting part towards the limiting head (13a) and the side part of the limiting part away from the limiting head (13a) are respectively provided with a second matching groove (21) matched with the limiting head (13a).

9. The flow adjustable hand operated diaphragm valve according to claim 7, wherein: The two limiting blocks (19) are respectively provided with clamping grooves (22) on the end faces close to each other, and the two clamping grooves (22) are respectively clamped on the two side parts of the limiting rod (13).

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