Manual diaphragm valve

Abstract

The invention discloses a manual diaphragm valve, and relates to the technical field of valves. The manual diaphragm valve comprises a valve body, a flow path, a diaphragm, a valve rod and an execution seat, and the execution seat comprises an inner seat body, an outer seat body, a seat cavity, a first elastic piece and a padlock groove. According to the manual diaphragm valve, the outer seat body on the manual diaphragm valve can be effectively far away from the valve rod under the action of the first elastic piece, so that the valve rod can be completely separated from the padlock groove when located at the first position, an operator can lock a lock in the padlock groove conveniently, movement of the valve rod is limited, and abnormal movement of the valve rod due to the fact that the operator touches the outer seat body by mistake is prevented; therefore, abnormal opening of the manual diaphragm valve can be avoided.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a manual diaphragm valve. Background Art

[0002] As a device used for gas control in the semiconductor industry, the modular gas system can be designed on the panel in a building block manner based on the customer's PID diagram, using standard valve blocks, valves, flow meters, filters, pressure sensors and other components. Among them, the manual diaphragm valve, which is the core component of the modular gas system, is extremely important for its valve opening and closing stability.

[0003] However, due to the small installation space of the modular gas system, different components need to be arranged closely together. When the operator is operating other components, it is easy to accidentally touch the manual diaphragm valve, causing the manual diaphragm valve to open or close abnormally, which greatly affects the operational stability of the modular gas system. Summary of the invention

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

[0005] The manual diaphragm valve provided in this application adopts the following technical solution: A manual diaphragm valve, comprising a valve body, a flow path opened in the valve body, a deformable diaphragm arranged in the valve body for opening or closing the flow path, a valve stem for pressing the diaphragm, the valve stem being threadedly inserted into the valve body along its own axial direction, the manual diaphragm valve also comprising an actuator seat for driving the valve stem to rotate, the actuator seat comprising an inner seat body sleeved on the valve stem, an outer seat body sleeved on the inner seat body slidably along the axial direction of the valve stem, a seat cavity formed between the inner seat body and the outer seat body, and a valve seat disposed in the seat cavity and having two ends. A first elastic member connected to the outer seat body and the inner seat body respectively, and a padlock groove extending through the end of the outer seat body away from the inner seat body, the padlock groove is communicated with the seat cavity and its extension direction is perpendicular to the axial direction of the valve stem, and the valve stem has a first position pressing the diaphragm and a second position detaching from the diaphragm during its rotation, when the valve stem is in the first position, the end of the valve stem away from the diaphragm is accommodated in the seat cavity; when the valve stem is in the second position, the end of the valve stem away from the diaphragm is successively penetrated in the seat cavity and the padlock groove.

[0006] By adopting the above technical scheme, the operator can judge the opening and closing of the diaphragm by the extension degree of the valve stem in the padlock groove, so as to realize effective monitoring of the opening and closing state of the manual diaphragm valve; at the same time, the outer seat body can effectively move away from the valve stem under the action of the first elastic member, so that the valve stem can completely leave the padlock groove when it is in the first position, which is convenient for the operator to padlock in the padlock groove and limit the movement of the valve stem, and prevent the abnormal movement of the valve stem caused by the operator accidentally touching the outer seat body, thereby preventing the abnormal opening of the manual diaphragm valve; and, when the valve stem is in the second position, its end is inserted into the padlock groove, and the padlock groove cannot be padlocked at this time, so as to prevent the manual diaphragm valve from being unable to close normally due to the operator's abnormal padlocking, thereby ensuring the safety and rationality of the operation; further, the padlock can be flexibly removed according to specific operating needs, and it will not affect the normal operation of the operator.

[0007] Preferably, a locking seat is coaxially arranged on the valve body, the outer seat body is sleeved on the locking seat and can rotate around the circumference of the locking seat, a limiting post is arranged on the side portion of the locking seat, and a limiting groove is arranged on the side portion of the outer seat body, the extension direction of the limiting groove is consistent with the rotation direction of the outer seat body, and the limiting post can be slidably passed through the limiting groove, and the limiting groove includes a slot body, a first locking groove and a second locking groove arranged at two ends of the slot body, the first locking groove and the second locking groove are both located on a side of the slot body away from the padlock groove and both extend along the axial direction of the outer seat body respectively, the length of the first locking groove is greater than the length of the second locking groove, when the valve stem is in the first position, the limiting post is accommodated in the first locking groove; when the valve stem is in the second position, the limiting post is accommodated in the second locking groove.

[0008] By adopting the above technical solution, the outer seat body can achieve rotation limit under the cooperation of the limit column and the limit groove. When the outer seat body is located in the first locking groove and the second locking groove, the outer seat body cannot rotate, which further prevents the valve from opening or closing abnormally due to the operator accidentally touching the outer seat body; at the same time, when the limit column is located in the first locking groove, the outer seat body can have a larger displacement margin, so that it can be further away from the valve stem, which further facilitates the operator to padlock in the padlock groove.

[0009] Preferably, the locking seat is provided with an opening mark and a closing mark at intervals around its own circumference, and the outer seat body is also provided with an observation port for exposing the opening mark and the closing mark, and when the valve stem is in the first position, the closing mark is exposed in the observation port; when the valve stem is in the second position, the opening mark is exposed in the observation port.

[0010] By adopting the above technical solution, the operator can conveniently observe the opening and closing state of the manual diaphragm valve through the observation port, thereby being able to more effectively monitor the opening and closing state of the manual diaphragm valve.

[0011] Preferably, the outer seat body is provided with a first accommodating groove for accommodating the locking seat at one end facing the valve body, a second accommodating groove for accommodating the inner seat body is provided on the bottom surface of the first accommodating groove, and the inner seat body is provided with a third accommodating groove at one end facing the outer seat body, and the seat cavity is formed between the second accommodating groove and the third accommodating groove.

[0012] Preferably, the manual diaphragm valve also includes two locking members respectively arranged on two sides of the outer base body, each of the locking members respectively includes a locking plate covering the notch of the padlock slot and a locking column arranged on the locking plate, the two locking columns constituting the two locking members are movably arranged in a direction of approaching or moving away from each other, and the two locking columns can be aligned or relatively moved away from each other during the movement, and the outer base body is also provided with a driving member for driving the two locking columns to be aligned and a unlocking member for driving the two locking columns to be relatively moved away from each other.

[0013] By adopting the above technical solution, when the valve stem is out of the padlock slot, the two locking columns can automatically dock and lock the padlock slot under the action of the driving member, without the operator having to padlock the padlock slot separately, which greatly improves work efficiency; at the same time, the operator can conveniently unlock the locking member through the unlocking member, avoiding the locking member from affecting the normal operation of the operator.

[0014] Preferably, the unlocking member includes an unlocking column which is movable in a direction approaching or away from the locking column and is penetrated in a groove wall on a side of the padlock groove away from the valve stem, and a second elastic member is sleeved on the unlocking column, and both ends of the second elastic member are respectively connected to an end portion of the unlocking column close to the valve stem and the groove wall, and the docking position of the two locking columns is located on the moving path of the unlocking column.

[0015] By adopting the above technical solution, the unlocking column can be inserted into the butt gap between the two locking columns during its movement, which greatly improves the unlocking efficiency.

[0016] Preferably, the two locking columns have docking portions at their ends close to each other, and a first inclined surface is provided on a side of each docking portion close to the unlocking column, and the inclination directions of the two first inclined surfaces are opposite. The unlocking column has a conical unlocking portion at one end close to the locking column, and second inclined surfaces matching the two first inclined surfaces are respectively provided on both sides of the unlocking portion.

[0017] By adopting the above technical solution, the unlocking part can be smoothly inserted between the two docking parts and continuously push the two first inclined surfaces during the movement, so that the operator can unlock the locking member easily.

[0018] Preferably, a hand-holding portion is provided at the end of the outer base body, and two side portions of the hand-holding portion are respectively recessed inward to form an arc-shaped hand-holding surface, and the notches at both ends of the padlock slot are respectively located on the two hand-holding surfaces.

[0019] By adopting the above technical solution, not only the finger operating space of the operator is increased, but also the maximization of the force arm is ensured, which makes it convenient for the operator to hold the handheld part and operate the outer base.

[0020] Preferably, the valve body includes a lower valve seat, an upper valve seat arranged on the lower valve seat, and a nut for locking the upper valve seat and the lower valve seat relative to each other, a diaphragm cavity is formed between the upper valve seat and the lower valve seat, the diaphragm is arranged in the diaphragm cavity, the flow path is opened in the lower valve seat and communicated with the diaphragm cavity, a valve cavity is opened in the upper valve seat, a slidable pushing block is arranged at one end of the valve cavity close to the diaphragm, and the valve stem is threadedly connected to the valve cavity and connected to the pushing block.

[0021] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The operator can judge the opening and closing of the diaphragm by the extension degree of the valve stem in the padlock groove, thereby realizing effective monitoring of the opening and closing state of the manual diaphragm valve; 2. The outer seat body can effectively move away from the valve stem under the action of the first elastic member, so that the valve stem can completely leave the padlock groove when it is in the first position, which is convenient for the operator to padlock in the padlock groove and restrict the movement of the valve stem, thereby preventing the valve stem from moving abnormally due to the operator accidentally touching the outer seat body, thereby preventing the manual diaphragm valve from opening abnormally; 3. When the valve stem is in the second position, its end is inserted into the padlock slot. At this time, the padlock slot cannot be locked, preventing the manual diaphragm valve from being unable to close normally due to abnormal padlocking by the operator, thus ensuring the safety and rationality of the operation; 4. The padlock can be removed flexibly according to specific operation needs, which will not affect the normal operation of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of the manual diaphragm valve in the embodiment of the present application when it is in an open state; Figure 2 is a front view of the manual diaphragm valve in the embodiment of the present application when it is in an open state; Figure 3 yes Figure 2 AA section diagram in; Figure 4 is a schematic diagram of the three-dimensional structure of the manual diaphragm valve in the embodiment of the present application when it is in a closed state; Figure 5 is a front view of the manual diaphragm valve in the embodiment of the present application when it is in a closed state; Figure 6 yes Figure 5 Schematic diagram of the BB cross section.

[0023] Markings in the accompanying drawings: 1. Valve body; 1a. Lower valve seat; 1b. Upper valve seat; 1c. Nut; 1d. Diaphragm cavity; 1e. Valve cavity; 1f. Push block; 2. Flow path; 3. Diaphragm; 4. Valve stem; 5. Actuator seat; 5a. Inner seat body; 5b. Outer seat body; 5c. Seat cavity; 5c1. Second receiving groove; 5c2. Third receiving groove; 5d. First elastic member; 5e. Padlock groove; 5f. First receiving groove; 6. Locking seat; 7. Limit Column; 8, limit groove; 8a, groove body; 8b, first locking groove; 8c, second locking groove; 9, open mark; 10, close mark; 11, observation port; 12, locking member; 12a, locking plate; 12b, locking column; 12c, docking part; 12d, mounting groove; 13, driving member; 14, unlocking member; 14a, unlocking column; 14b, second elastic member; 14c, unlocking part; 15, hand-held part. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1-6 The present invention is described in further detail.

[0025] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are 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.

[0026] See also Figure 1-6 As shown, a manual diaphragm valve is shown, including 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 or closing the flow path 2, and a valve stem 4 for pressing the diaphragm 3, and the valve stem 4 is threadedly penetrated in the valve body 1 along its own axial direction.

[0027] Among them, combined Figure 3 and Figure 6As shown, the valve stem 4 extends in the vertical direction, the valve body 1 includes a lower valve seat 1a, an upper valve seat 1b arranged on the lower valve seat 1a, and a nut 1c for locking the upper valve seat 1b and the lower valve seat 1a relative to each other, a membrane cavity 1d is formed between the upper valve seat 1b and the lower valve seat 1a, the diaphragm 3 is arranged in the membrane cavity 1d, the flow path 2 is opened in the lower valve seat 1a and communicates with the membrane cavity 1d, a valve cavity 1e extending in the vertical direction is opened in the upper valve seat 1b, a slidable push block 1f is arranged at one end of the valve cavity 1e close to the diaphragm 3, the valve stem 4 is threadedly connected in the valve cavity 1e and its lower end is connected to the push block 1f. The push block 1f is driven by the rotation of the valve stem 4, so that the push block 1f is pressed on the diaphragm 3 or separated from the diaphragm 3, thereby realizing the diaphragm 3 to close or open the flow path 2.

[0028] In this embodiment, the manual diaphragm valve also includes an actuator seat 5 for driving the valve stem 4 to rotate. The actuator seat 5 is located at the upper end of the valve body 1, and includes an inner seat body 5a sleeved on the valve stem 4, an outer seat body 5b slidably sleeved on the inner seat body 5a along the axial direction of the valve stem 4, a seat cavity 5c formed between the inner seat body 5a and the outer seat body 5b, a first elastic member 5d disposed in the seat cavity 5c and connected to the outer seat body 5b and the inner seat body 5a at both ends, and a padlock groove 5e extending through the upper end of the outer seat body 5b. The first elastic member 5d is a spring, the padlock groove 5e is connected to the seat cavity 5c and extends in the horizontal direction, and the valve stem 4 has a first position pressing the diaphragm 3 and a second position detaching from the diaphragm 3 during its rotation. When the valve stem 4 is in the first position, the manual diaphragm valve is in a closed state, and at this time, the end of the valve stem 4 away from the diaphragm 3 is accommodated in the seat cavity 5c; when the valve stem 4 is in the second position, the manual diaphragm valve is in an open state, and the end of the valve stem 4 away from the diaphragm 3 is successively penetrated in the seat cavity 5c and the padlock groove 5e.

[0029] In this way, the operator can judge the opening and closing of the diaphragm 3 by the extension degree of the valve stem 4 in the padlock groove 5e, thereby being able to effectively monitor the opening and closing state of the manual diaphragm valve; at the same time, the outer seat body 5b can effectively move away from the valve stem 4 under the action of the first elastic member 5d, so that the valve stem 4 can be completely separated from the padlock groove 5e when it is in the first position, which is convenient for the operator to padlock in the padlock groove 5e and limit the movement of the valve stem 4, and prevent the valve stem 4 from moving abnormally due to the operator accidentally touching the outer seat body 5b, thereby being able to prevent the manual diaphragm valve from opening abnormally; and, when the valve stem 4 is in the second position, its end is inserted into the padlock groove 5e, and the padlock groove 5e cannot be padlocked at this time, preventing the manual diaphragm valve from being unable to close normally due to the operator's abnormal padlocking, thereby ensuring the safety and rationality of the operation; further, the padlock can be flexibly removed according to specific operating needs, and it will not affect the normal operation of the operator.

[0030] In this embodiment, a locking seat 6 is coaxially arranged on the upper end of the valve body 1, and the outer seat body 5b is sleeved on the locking seat 6 and can rotate around the circumference of the locking seat 6. Figure 2 and Figure 5 As shown, a limiting column 7 is provided on the side of the locking seat 6, and a limiting groove 8 is provided on the side of the outer seat body 5b. The extending direction of the limiting groove 8 is consistent with the rotation direction of the outer seat body 5b. The limiting column 7 can be slidably penetrated into the limiting groove 8. The limiting groove 8 includes a groove body 8a, a first locking groove 8b and a second locking groove 8c provided at both ends of the groove body 8a. The first locking groove 8b and the second locking groove 8c are both located on the lower side of the groove body 8a and both extend along the vertical direction respectively. The length of the first locking groove 8b is greater than that of the second locking groove 8c. When the valve stem 4 is in the first position, the limiting column 7 is accommodated in the first locking groove 8b; when the valve stem 4 is in the second position, the limiting column 7 is accommodated in the second locking groove 8c.

[0031] The outer seat body 5b can achieve rotational limitation with the cooperation of the limiting column 7 and the limiting groove 8. When the outer seat body 5b is located in the first locking groove 8b and the second locking groove 8c, the outer seat body 5b cannot rotate, which further prevents the valve from opening or closing abnormally due to the operator accidentally touching the outer seat body 5b; at the same time, when the limiting column 7 is located in the first locking groove 8b, the outer seat body 5b can have a larger displacement margin, so that it can be further away from the valve stem 4, which further facilitates the operator to padlock in the padlock groove 5e; and when the limiting column 7 is located in the second locking groove 8c, its displacement margin is smaller, and the valve stem 4 can still be inserted into the padlock groove 5e.

[0032] In this embodiment, combined again Figure 2 and Figure 5 As shown, the upper end surface of the locking seat 6 is provided with an opening mark 9 and a closing mark 10 at intervals around the circumference thereof, and the side of the outer seat body 5b is also provided with an observation port 11 for exposing the opening mark 9 and the closing mark 10. When the valve stem 4 is in the first position, the closing mark 10 is exposed in the observation port 11; when the valve stem 4 is in the second position, the opening mark 9 is exposed in the observation port 11. When the outer seat body 5b is rotated, the outer seat body 5b can drive the valve stem 4 to rotate through the inner seat body 5a, so that the valve stem 4 is respectively in the first position and the second position, and during the rotation process of the outer seat body 5b, the observation port 11 can pass through and expose the opening mark 9 and the closing mark 10, so that the operator can conveniently observe the opening and closing state of the manual diaphragm valve through the observation port 11, thereby being able to more effectively monitor the opening and closing state of the manual diaphragm valve.

[0033] In this embodiment, combined with Figure 3 and Figure 6As shown, the outer seat body 5b is provided with a first receiving groove 5f for receiving the locking seat 6 at one end facing the valve body 1, the second receiving groove 5c1 for receiving the inner seat body 5a is provided on the bottom surface of the first receiving groove 5f, the inner seat body 5a is provided with a third receiving groove 5c2 at one end facing the outer seat body 5b, and the seat cavity 5c is formed between the second receiving groove 5c1 and the third receiving groove 5c2. The outer seat body 5b, the inner seat body 5a and the locking seat 6 are all cylindrical, and the inner wall of one side of the second receiving groove 5c1 and the outer wall of one side of the inner seat body 5a respectively have limiting planes, and the two limiting planes are in contact with each other, which can prevent the inner seat body 5a and the outer seat body 5b from rotating relative to each other.

[0034] In this embodiment, the manual diaphragm valve further comprises two locking members 12 respectively arranged on both sides of the outer seat body 5b, each locking member 12 respectively comprises a locking plate 12a covering the notch of the padlock slot 5e, and a locking column 12b arranged on the locking plate 12a, the locking column 12b extending in the horizontal direction, and the two locking columns 12b constituting the two locking members 12 are movable in the direction of approaching or moving away from each other, and the two locking columns 12b can be aligned or relatively moved away during the movement, and the outer seat body 5b is also provided with a driving member 13 for driving the two locking columns 12b to be aligned and connected, and an unlocking member 14 for driving the two locking columns 12b to be relatively moved away. Among them, the locking plate 12a is provided with a mounting groove 12d, the locking column 12b is arranged in the mounting groove 12d, and the driving member 13 is a spring whose two ends are respectively connected to the locking column 12b and the groove bottom surface of the mounting groove 12d.

[0035] When the valve stem 4 is out of the padlock slot 5e, the two locking columns 12b can automatically dock and lock the padlock slot 5e under the action of the spring, without the operator having to padlock the padlock slot 5e separately, which greatly improves work efficiency; at the same time, the operator can conveniently unlock the locking member 12 through the unlocking member 14, avoiding the locking member 12 from affecting the normal operation of the operator.

[0036] In this embodiment, the unlocking member 14 includes an unlocking column 14a that is movable along the vertical direction and is inserted into the upper side groove wall of the padlock groove 5e, and a second elastic member 14b that is sleeved on the unlocking column 14a. The second elastic member 14b is a spring, and the two ends of the second elastic member 14b are respectively connected to the lower end of the unlocking column 14a and the groove wall. The docking position of the two locking columns 12b is located on the moving path of the unlocking column 14a.

[0037] Among them, the two locking columns 12b have a docking portion 12c at one end close to each other, and a first inclined surface is provided on the upper side of each docking portion 12c. The inclination directions of the two first inclined surfaces are opposite, and the two first inclined surfaces form a V-shaped groove. The unlocking column 14a has a conical unlocking portion 14c at one end close to the locking column 12b, and the unlocking portion 14c matches the V-shaped groove. The two sides of the unlocking portion 14c respectively have second inclined surfaces matching the two first inclined surfaces.

[0038] In this way, when the locking member 12 needs to be unlocked, the operator only needs to press the unlocking column 14a downward, and the unlocking portion 14c can be smoothly inserted downward between the two docking portions 12c and continuously push the two first inclined surfaces during the movement, so that the two locking columns 12b are relatively far apart. At this time, the valve stem 4 can extend into the padlock groove 5e, thereby realizing the transition of the manual diaphragm valve from a closed state to an open state; after the unlocking is completed, stop pressing the unlocking column 14a, and the unlocking column 14a can be reset under the action of the second elastic member 14b. At this time, if the valve stem 4 is away from the padlock groove 5e again, the two locking columns 12b can dock again and realize the locking of the manual diaphragm valve.

[0039] In this embodiment, combined with Figure 1 and Figure 4 As shown, a hand-held portion 15 is provided at the end of the outer base 5b, and the two sides of the hand-held portion 15 are respectively recessed inward to form an arc-shaped hand-held surface, and the notches at both ends of the padlock slot 5e are respectively located on the two hand-held surfaces. This not only increases the finger operation space of the operator, but also ensures the maximization of the force arm, making it easier for the operator to hold the hand-held portion 15 and operate the outer base 5b.

[0040] The implementation principle of the manual diaphragm valve in the embodiment of the present application is: When closing the manual diaphragm valve, pinch the two hand-held surfaces of the outer seat body 5b and press the outer seat body 5b downward to disengage the limiting column 7 from the second locking groove 8c, then rotate the outer seat body 5b to expose the closing mark 10 in the observation port 11, at this time, the valve stem 4 moves downward from the second position to the first position driven by the inner seat body 5a and presses the diaphragm 3, the manual diaphragm valve is closed, then release the outer seat body 5b, the outer seat body 5b moves upward under the action of the first elastic member 5d, the limiting column 7 enters the first locking groove 8b, and the two locking columns 12b are aligned and docked under the action of the spring and lock the valve stem 4 in the first position, so that the manual diaphragm valve can be continuously kept in the closed state; When opening the manual diaphragm valve, pinch the two holding surfaces of the outer seat body 5b and press the unlocking column 14a. The unlocking column 14a pushes the two locking columns 12b relatively away from each other, and then presses the outer seat body 5b downward to make the limiting column 7 disengage from the first locking groove 8b. Then rotate the outer seat body 5b to expose the opening mark 9 to the observation port 11. At this time, the valve stem 4 moves upward from the first position to the second position driven by the inner seat body 5a, and its lower end disengages from the diaphragm 3 and the upper end is inserted between the two locking columns 12b. The manual diaphragm valve is opened, and then release the outer seat body 5b, and the limiting column 7 enters the second locking groove 8c.

[0041] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A manual diaphragm valve, comprising a valve body (1), a flow path (2) provided in the valve body (1), a deformable diaphragm (3) provided in the valve body (1) for opening or closing the flow path (2), and a valve stem (4) for pressing the diaphragm (3), characterized in that: The valve stem (4) is threadedly inserted into the valve body (1) along its own axial direction. The manual diaphragm valve also includes an actuator seat (5) for driving the valve stem (4) to rotate. The actuator seat (5) includes an inner seat body (5a) sleeved on the valve stem (4), an outer seat body (5b) sleeved on the inner seat body (5a) slidably along the axial direction of the valve stem (4), a seat cavity (5c) formed between the inner seat body (5a) and the outer seat body (5b), a first elastic member (5d) arranged in the seat cavity (5c) and having two ends respectively connected to the outer seat body (5b) and the inner seat body (5a), and a spring member (5d) extending through the outer seat body (5a). 5b) a padlock groove (5e) away from one end of the inner seat body (5a), the padlock groove (5e) being connected to the seat cavity (5c) and its extension direction being perpendicular to the axial direction of the valve stem (4), the valve stem (4) having a first position for pressing the diaphragm (3) and a second position for separating from the diaphragm (3) during its rotation, when the valve stem (4) is in the first position, the end of the valve stem (4) away from the diaphragm (3) is accommodated in the seat cavity (5c); when the valve stem (4) is in the second position, the end of the valve stem (4) away from the diaphragm (3) is successively penetrated into the seat cavity (5c) and the padlock groove (5e).

2. A manual diaphragm valve according to claim 1, characterized in that: A locking seat (6) is coaxially arranged on the valve body (1); the outer seat body (5b) is sleeved on the locking seat (6) and can rotate around the circumference of the locking seat (6); a limiting column (7) is arranged on the side of the locking seat (6); a limiting groove (8) is arranged on the side of the outer seat body (5b); the extending direction of the limiting groove (8) is consistent with the rotation direction of the outer seat body (5b); the limiting column (7) can be slidably inserted into the limiting groove (8); the limiting groove (8) includes a groove body (8a), a first locking groove ( 8b) and a second locking groove (8c), the first locking groove (8b) and the second locking groove (8c) are both located on a side of the groove body (8a) away from the padlock groove (5e), ​​and both extend along the axial direction of the outer seat body (5b), the length of the first locking groove (8b) is greater than the length of the second locking groove (8c), when the valve stem (4) is in the first position, the limiting column (7) is accommodated in the first locking groove (8b); when the valve stem (4) is in the second position, the limiting column (7) is accommodated in the second locking groove (8c).

3. A manual diaphragm valve according to claim 2, characterized in that: The locking seat (6) is provided with an opening mark (9) and a closing mark (10) at intervals around its own circumference, and the outer seat body (5b) is also provided with an observation port (11) for exposing the opening mark (9) and the closing mark (10). When the valve stem (4) is in the first position, the closing mark (10) is exposed in the observation port (11); when the valve stem (4) is in the second position, the opening mark (9) is exposed in the observation port (11).

4. A manual diaphragm valve according to claim 2, characterized in that: The outer seat body (5b) is provided with a first accommodating groove (5f) for accommodating the locking seat (6) at one end facing the valve body (1), a second accommodating groove (5c1) for accommodating the inner seat body (5a) is provided on the bottom surface of the first accommodating groove (5f), the inner seat body (5a) is provided with a third accommodating groove (5c2) at one end facing the outer seat body (5b), and the seat cavity (5c) is formed between the second accommodating groove (5c1) and the third accommodating groove (5c2).

5. A manual diaphragm valve according to any one of claims 1 to 4, characterized in that: The manual diaphragm valve also includes two locking members (12) respectively arranged on the two side parts of the outer base body (5b), each of the locking members (12) respectively includes a locking plate (12a) covering the notch of the padlock slot (5e) and a locking column (12b) arranged on the locking plate (12a), and the two locking columns (12b) constituting the two locking members (12) are movably arranged in a direction approaching or moving away from each other, and the two locking columns (12b) can be aligned or relatively moved away during the movement, and the outer base body (5b) is also provided with a driving member (13) for driving the two locking columns (12b) to be aligned and connected, and an unlocking member (14) for driving the two locking columns (12b) to be relatively moved away.

6. A manual diaphragm valve according to claim 5, characterized in that: The unlocking member (14) comprises an unlocking column (14a) which is movable in a direction approaching or moving away from the locking column (12b) and is inserted into a groove wall on a side of the padlock groove (5e) away from the valve stem (4), and a second elastic member (14b) which is sleeved on the unlocking column (14a), wherein the two ends of the second elastic member (14b) are respectively connected to an end of the unlocking column (14a) close to the valve stem (4) and the groove wall, and the docking position of the two locking columns (12b) is located on the moving path of the unlocking column (14a).

7. A manual diaphragm valve according to claim 6, characterized in that: The two locking columns (12b) have abutting portions (12c) at their ends close to each other, and a first inclined surface is provided on a side of each of the abutting portions (12c) close to the unlocking column (14a), and the two first inclined surfaces are inclined in opposite directions. The unlocking column (14a) has a conical unlocking portion (14c) at one end close to the locking column (12b), and second inclined surfaces matching the two first inclined surfaces are provided on both sides of the unlocking portion (14c).

8. A manual diaphragm valve according to any one of claims 1 to 4, characterized in that: A hand-holding portion (15) is provided at the end of the outer base body (5b), and two side portions of the hand-holding portion (15) are respectively recessed inward to form an arc-shaped hand-holding surface, and the notches at both ends of the padlock slot (5e) are respectively located on the two hand-holding surfaces.

9. A manual diaphragm valve according to any one of claims 1 to 4, characterized in that: The valve body (1) comprises a lower valve seat (1a), an upper valve seat (1b) arranged on the lower valve seat (1a), and a nut (1c) for locking the upper valve seat (1b) and the lower valve seat (1a) relative to each other, a diaphragm cavity (1d) is formed between the upper valve seat (1b) and the lower valve seat (1a), the diaphragm (3) is arranged in the diaphragm cavity (1d), the flow path (2) is opened in the lower valve seat (1a) and communicates with the diaphragm cavity (1d), a valve cavity (1e) is opened in the upper valve seat (1b), and a slidable pushing block (1f) is arranged at one end of the valve cavity (1e) close to the diaphragm (3), and the valve stem (4) is threadedly connected to the valve cavity (1e) and connected to the pushing block (1f).

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