Manual diaphragm valve capable of being replaced in normally closed mode

Abstract

The invention relates to the technical field of diaphragm valves, and aims to solve the problems that a traditional diaphragm valve needs to be shut down when worn parts are replaced, disassembly is tedious, and sealing performance is insufficient. The diaphragm valve comprises a valve body, a valve middle cover, a valve top cover, a connecting assembly, a valve handle, a diaphragm piece, a valve screw rod, a torsion nut, a torsion limiting buckle and a locking ring, locking clamping teeth on the outer wall of the locking ring are matched with limiting clamping teeth on the side wall of an inner cavity of the valve top cover, the position of the valve is locked, and when the valve body is in a closed state, the diaphragm piece can be separated from the valve screw rod. Replacement of the valve handle and the torsion limiting buckle is completed, and replacement of abraded parts can be completed without shutdown; the connecting assembly is composed of a connecting insertion pipe, a limiting end cap, a pressing assembly, an elastic assembly and a compression spring, rapid disassembly and assembly can be achieved without tools, and the problem that a traditional long screw is tedious in disassembly is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diaphragm valves, in particular to a normally closed replaceable manual diaphragm valve. BACKGROUND

[0002] Whether it is the electronics industry, the semiconductor industry, the chemical industry, and the chemical-related industry, most of them need to transport and control chemicals, but general stainless steel valves will be corroded and damaged, and selecting a fluoroplastic manual diaphragm valve is a good method for controlling the transportation of chemical fluids. It has strong corrosion resistance and can resist the corrosion of most strong acids, strong bases and strong oxidizing chemicals. In addition to the sealing property of the fluoroplastic manual diaphragm valve, its auxiliary functions such as valve opening and closing position indication, locking torque limitation, and valve opening and closing locking function are the most practical. The valve opening and closing position indication can enable the operator to confirm the current valve opening and closing state from the appearance to avoid misoperation; the locking torque limitation function can prevent excessive locking from causing damage to the diaphragm and avoid valve leakage; the valve opening and closing locking function can keep the valve at the current position to avoid changes in the valve opening and closing position caused by external force or vibration.

[0003] The valve middle cover and the valve top cover of the traditional diaphragm valve are designed in an integrated structure, and the torque screw cap and the torque limiting buckle in the valve are high-frequency matching components that are prone to wear (failures occur when the matching gap is greater than 0.5 mm) due to long-term rotation and friction, and need to be replaced regularly. However, the integrated structure requires the entire valve cover assembly to be disassembled for replacement, which cannot maintain the closed and sealed state of the diaphragm in the valve body, and thus maintenance can only be carried out after the machine is stopped and depressurized. Therefore, a normally closed replaceable manual diaphragm valve needs to be developed. SUMMARY

[0004] In view of the above problems existing in the prior art, the purpose of the present application is to provide a normally closed replaceable manual diaphragm valve, which solves the technical problems of traditional diaphragm valves by adopting a split structure design, an innovative connection assembly and a standardized parameter system, and significantly improves the production continuity, maintenance efficiency, performance stability and operation safety.

[0005] The present application adopts the following technical scheme: a normally closed replaceable manual diaphragm valve, comprising a valve body, a valve middle cover, a valve top cover, a connection assembly, a valve handle, a diaphragm, a valve screw, a torque screw cap, a torque limiting buckle and a locking ring. The inner cavity of the valve body is provided with a diaphragm for controlling the flow, the top of the diaphragm is provided with a valve screw for controlling the axial up-down movement, the valve middle cover is installed on the top of the valve body for sealing the top of the diaphragm, and the top of the valve screw penetrates the inner cavity of the valve middle cover. The torque nut is sleeved on the outer wall of the valve spindle and connected with the valve spindle through threads, the valve top cover is sleeved on the outside of the torque nut and installed on the top of the valve middle cover, the locking ring is sleeved on the top end of the torque nut and rotates with the torque nut, the outside plate of the locking ring is provided with locking teeth, and the inner cavity side wall of the valve top cover is provided with limiting teeth matched with the locking teeth. The valve handle is installed in the top cavity of the torque nut, and the valve spindle moves axially and the torque nut rotates synchronously by twisting the valve handle, the bottom end is in the structure of an octagonal column, and the torque limiting buckle is arranged on the side wall of the bottom end of the valve handle, when the transmission torque is too large, the torque limiting buckle will be deformed and opened outward, at this time, the bottom end of the valve handle and the torque limiting buckle will rotate relative to each other by friction, thereby limiting the torque. The opening and closing positions of the lock valve need to be locked, the locking ring is manually rotated, the locking teeth on the outer wall of the locking ring are engaged with the limiting teeth on the inner cavity side wall of the valve top cover, the rotation of the nut is limited, and the position of the valve is locked. The valve body, the valve middle cover and the valve top cover are connected as a whole through the connecting assembly.

[0006] As a further improvement of the above scheme, the connecting assembly comprises a connecting pipe, a limiting end cap, a pressing assembly, an elastic assembly and a compression spring. The limiting end cap is installed on the top of the connecting pipe through threads, the elastic assembly is installed at the bottom end of the pressing assembly through threads, and the compression spring is installed at the bottom of the pressing assembly. The pressing assembly is installed in the inner cavity of the connecting pipe, and the elastic assembly and the compression spring are synchronously installed in the inner cavity of the connecting pipe, the top end of the connecting pipe penetrates the limiting end cap, and the outside plate of the elastic assembly penetrates the side wall of the connecting pipe.

[0007] As a further improvement of the above scheme, the top of the valve body is provided with stepped holes with large bottom and small top, the top of the valve middle cover and the valve top cover is provided with penetrating connecting holes, and the connecting holes are coaxial with the stepped holes, the connecting pipe can be inserted into the inner cavities of the connecting holes and the stepped holes, and the elastic assembly can be popped out and clamped in the inner cavity of the stepped hole by pressing the pressing assembly.

[0008] As a further improvement of the above scheme, the connecting pipe is a hollow pipe body with a closed bottom end and an open top end, a plurality of sets of tooth grooves are uniformly arranged on the side wall of the connecting pipe close to the bottom end, a plurality of guide strips are arranged on the inner cavity side wall of the connecting pipe close to the top end, and an internal thread is arranged on the inner side wall of the top end of the connecting pipe.

[0009] As a further improvement of the above-mentioned scheme, the pressing assembly comprises a threaded pressing push rod, a guide sliding block is arranged on the outer middle part of the pressing push rod, a guide groove matched with the guide strip is arranged on the outer wall of the guide sliding block, a limiting baffle is arranged on the pressing push rod close to the top end, and the top end of the pressing push rod is fixed with a pressing plate through threads.

[0010] As a further improvement of the above-mentioned scheme, the limiting end cap is provided with a hollow connecting head at the bottom, and an external thread matched with an internal thread is arranged on the outer side of the connecting head, a through hole for the pressing push rod to pass through is arranged in the middle part of the limiting end cap, and the limiting baffle can be embedded into the inner cavity of the connecting head of the limiting end cap.

[0011] As a further improvement of the above-mentioned scheme, the elastic assembly comprises a supporting block, a plurality of elastic clamps matched with the tooth grooves are welded on the outer wall of the supporting block, a threaded connecting sleeve is welded on the top of the supporting block, and a connecting block is arranged at the bottom of the supporting block; the connecting sleeve is connected with the bottom end of the pressing push rod through threads, and the connecting block can be embedded into the inner cavity of the compression spring.

[0012] As a further improvement of the above-mentioned scheme, the valve body and the valve middle cover are symmetrically provided with fixed insertion holes on the opposite side walls, and a fixed fastener is arranged between the fixed insertion holes of the valve body and the valve middle cover.

[0013] As a further improvement of the above-mentioned scheme, the fixed fastener comprises an I-shaped clamping plate, a fixed insertion block and a U-shaped handle. The fixed insertion block is welded on one side of the I-shaped clamping plate, the U-shaped handle is welded on the other side of the I-shaped clamping plate, and the fixed insertion block can be inserted into the fixed insertion hole to fix the valve body and the valve middle cover.

[0014] As a further improvement of the above-mentioned scheme, the top of the valve handle is provided with "OPEN" and "CLOSE" marks and corresponding rotating arrows.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows: The locking clamps on the outer wall of the locking ring are matched with the limiting clamps on the side wall of the inner cavity of the valve top cover, so that the position of the valve is locked, the valve handle and the torsion limiting buckle can be replaced when the diaphragm sheet can be in the closed state of the valve body, and the replacement of the worn parts can be completed without stopping the machine; The present application adopts the combined structure of "connecting insertion pipe + elastic assembly + compression spring", and only needs to insert the connecting insertion pipe into the stepped hole and the connecting hole and press the pressing plate to automatically clamp the elastic clamps during installation; and only needs to press again to shrink the elastic clamps during disassembly, without any tools. The components (pressing push rod, elastic card, compression spring) of the connecting assembly of the application adopt modular design, and can be directly reused after disassembly and keeping the assembled state; if a component is damaged (such as elastic card deformation, spring failure), the corresponding component can be replaced alone, without the need for overall scrapping, thereby reducing maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Three-dimensional exploded view of the application of the replaceable normally closed manual diaphragm valve; Figure 2 Three-dimensional display view of the application of the replaceable normally closed manual diaphragm valve; Figure 3 Three-dimensional display view of the connecting assembly of the application of the replaceable normally closed manual diaphragm valve; Figure 4 Three-dimensional display view of the connecting plug of the application of the replaceable normally closed manual diaphragm valve; Figure 5 Three-dimensional display view of the pressing assembly of the application of the replaceable normally closed manual diaphragm valve; Figure 6 Top view isometric view of the elastic assembly of the application of the replaceable normally closed manual diaphragm valve; Figure 7 Bottom view isometric view of the elastic assembly of the application of the replaceable normally closed manual diaphragm valve; Figure 8 Three-dimensional display view of the valve body of the application of the replaceable normally closed manual diaphragm valve; Figure 9 Three-dimensional display view of the application of the replaceable normally closed manual diaphragm valve with a fixed fastener; Figure 10 Three-dimensional display view of the application of the replaceable normally closed manual diaphragm valve in a separated state from the fixed fastener; Figure 11 Three-dimensional display view of the fixed fastener of the application of the replaceable normally closed manual diaphragm valve; Figure 12 Top view of the valve handle of the application of the replaceable normally closed manual diaphragm valve.

[0017] Main symbol explanation: 1, valve body; 2, valve middle cover; 3, valve top cover; 4, connecting assembly; 41, connecting cannula; 411, clamping tooth groove; 412, guide bar; 413, internal thread; 42, limiting end cap; 43, pressing assembly; 431, pressing push rod; 432, guide slider; 433, limiting baffle; 434, pressing plate; 435, guide groove; 44, elastic assembly; 441, support block; 442, elastic clamp; 443, connecting sleeve; 444, connecting block; 45, compression spring; 5, valve handle; 6, diaphragm; 7, valve screw; 8, torque nut; 9, torque limiting buckle; 10, locking ring; 11, stepped hole; 12, connecting hole; 13, fixing fastener; 131, I-shaped clamping plate; 132, fixed insertion block; 133, U-shaped handle; 14, fixed insertion hole. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings of the embodiments of the present disclosure.

[0019] Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present disclosure.

[0020] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood as the general meaning understood by those of ordinary skill in the art to which the present disclosure belongs. The similar words such as "comprise" or "include" and the like used in the present disclosure mean that the elements or objects before the words cover the elements or objects listed after the words and their equivalents, without excluding other elements or objects. The similar words such as "connect" or "connected" are not limited to physical or mechanical connection, but also include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits the detailed description of known functions and known components.

[0022] Please combine Figures 1-2As shown in Figure 12, an embodiment of the present invention provides a normally closed replaceable manual diaphragm valve, comprising: a valve body 1, a valve middle cover 2, and a valve top cover 3. A diaphragm 6 (made of polytetrafluoroethylene) for controlling its flow rate is installed in the inner cavity of the valve body 1. A valve screw 7 for controlling its axial up-and-down movement is installed on the top of the diaphragm 6. The valve middle cover 2 is installed on the top of the valve body 1 for sealing the top of the diaphragm 6. The top of the valve screw 7 passes through the inner cavity of the valve middle cover 2. A guide groove is vertically formed on the outer side of the valve screw 7. A guide ridge matching the groove is provided in the inner cavity of the valve middle cover 2. The valve screw 7 slides up and down along the guide ridge in the inner cavity of the valve middle cover 2 using the groove on the outer side of the valve screw 7, preventing the valve screw 7 from rotating and allowing it to move only axially. A thread is provided on the outer wall of the valve screw 7. A torque nut 8 is threadedly connected to the outer wall of the valve screw 7. The valve top cover 3 is fitted onto the outside of the torque nut 8 and installed on the top of the valve middle cover 2. A locking ring 10 is fitted on the top of the torque nut 8. A combination protrusion is provided on the inner side wall of the locking ring 10. A combination groove matching the locking protrusion is provided on the outside of the torque nut 8. The locking ring 10 can rotate synchronously with the torque nut 8 by using the combination groove to engage with the combination protrusion. A locking tooth is provided on the outer side wall of the locking ring 10. A limiting tooth that engages with the locking tooth is provided on the inner side wall of the valve top cover 3. To lock the valve's open / closed position, the locking ring 10 is manually rotated so that the locking tooth on the outer wall of the locking ring 10 engages with the limiting tooth on the inner side wall of the valve top cover 3, thereby restricting the rotation of the nut 5 and locking the valve position. A valve handle 5 for controlling the rotation of the valve screw 7 is installed in the inner cavity of the top of the torque nut 8. Turning the valve handle 5 rotates the valve screw 7 and drives it to move up and down axially. The top of the valve handle 5 is provided with the English words "OPEN" and "CLOSE" and the corresponding rotating arrow, so that the opening and closing position of the diaphragm 6 can be observed from the outside of the valve. The bottom end of the valve handle 5 is set as an octagonal column. The torque limiting buckle 9 is locked on the bottom octagonal column of the valve handle 5 from the side. When the transmission torque is too large, the torque limiting buckle 9 will deform and open outward. At this time, the bottom end of the valve handle 5 and the torque limiting buckle 9 will rub against each other and rotate relative to each other, thereby limiting the torque and preventing damage to the diaphragm 6 and other components due to excessive torque. The bottom end of the valve handle 5 rubs against the torque limiting buckle 9, which will cause wear and tear. When the valve handle 5 and the torque limiting buckle 9 are worn due to long-term use of the friction surface, they need to be replaced. The existing diaphragm valve cannot maintain the closed state of the diaphragm 6 in the inner cavity of the valve body 1 when the valve handle 5 and the torque limiting buckle 9 are replaced, and needs to be stopped for maintenance, which is relatively complicated. In the present scheme, when the valve handle 5 and the torque limiting buckle 9 need to be replaced, the locking ring 10 is manually rotated, the locking teeth on the outer wall of the locking ring 10 are engaged with the limiting teeth on the side wall of the inner cavity of the valve top cover 3, and the position of the valve is locked, so that the replacement of the valve handle 5 and the torque limiting buckle 9 can be completed when the diaphragm 6 is in the closed state of the valve body 1. The valve body 1, the valve middle cover 2 and the valve top cover 3 are usually connected as a whole by long screws. The torque screw cap 8 will be worn due to rotation during long-term use and needs to be replaced regularly. When the torque screw cap 8 needs to be replaced, the valve top cover 3 needs to be disassembled. When the valve top cover 3 is disassembled, the worker needs to disassemble it by using tools, which is relatively complicated and inconvenient. Figures 1-8As shown, a stepped hole 11 with a large bottom and a small top is vertically arranged at the top of the four corners of the valve body 1, and a connecting hole 12 is vertically arranged at the top of the four corners of the valve middle cover 2 and the valve top cover 3, and the axis of the connecting hole 12 coincides with the axis of the stepped hole 11, so that when the valve body 1, the valve middle cover 2 and the valve top cover 3 are connected as a whole, the connecting hole 12 and the stepped hole 11 can form a continuous channel, and a connecting assembly 4 for connecting the valve body 1, the valve middle cover 2 and the valve top cover 3 as a whole is vertically arranged in the inner cavity of the stepped hole 11 and the connecting hole 12, wherein the connecting assembly 4 comprises a connecting insertion pipe 41, a limiting end cap 42, a pressing assembly 43, an elastic assembly 44 and a compression spring 45, the limiting end cap 42 is threadedly arranged at the top of the connecting insertion pipe 41, the elastic assembly 44 is threadedly arranged at the bottom end of the pressing assembly 43, the compression spring 45 is arranged at the bottom of the pressing assembly 43 (the compression spring 45 is made of piano wire, the diameter is 2-3 mm, the effective number of turns is 15-88 turns, the elastic coefficient is 15-25 N / mm, the working stroke is 8-12 mm, and the compression spring 45 can provide a spring force of 30-50 N in the compression state, so as to ensure that the elastic assembly 44 is always in a taut state), and the pressing assembly 43 with the elastic assembly 44 and the compression spring 45 is arranged in the inner cavity of the connecting insertion pipe 41, the top end of the connecting insertion pipe 41 penetrates through the top of the limiting end cap 42, and the outer side plate of the elastic assembly 44 penetrates through the side wall of the connecting insertion pipe 41, when the connecting insertion pipe 41 is vertically inserted into the inner cavity of the connecting hole 12, the outer side plate of the elastic assembly 44 will shrink into the inner cavity of the connecting insertion pipe 41 due to the extrusion, when the bottom end of the connecting insertion pipe 41 reaches the inner cavity of the stepped hole 11, the outer side plate of the elastic assembly 44 can be popped out from the inner cavity of the connecting insertion pipe 41 by pressing the top end of the pressing assembly 43, so that the elastic assembly 44 can be clamped in the inner cavity of the stepped hole 11, and the elastic assembly 44 is in a taut state in the inner cavity of the connecting insertion pipe 41 by the elastic force of the compression spring 45, so as to avoid that the elastic assembly 44 is separated from the inner cavity of the stepped hole 11 due to gravity, when it is necessary to disassemble the valve top cover 3, only the top end of the pressing assembly 43 needs to be pressed downward to shrink the elastic assembly 44 into the inner cavity of the connecting insertion pipe 41, and then the connecting assembly 4 is pulled out from the inner cavities of the stepped hole 11 and the connecting hole 12, so that the valve top cover 3 can be disassembled, and the replacement of the torque nut 8 can be completed; In order to further illustrate the structure of the connecting insertion pipe 41, the pressing assembly 43 and the elastic assembly 44, Figures 3-7As shown, the connecting tube 41 is a hollow tube with a closed bottom and an open top. Multiple sets of locking grooves 411 that cooperate with the elastic component 44 are evenly opened on the side wall of the connecting tube 41 near the bottom, so that the outer side plate of the elastic component 44 can pass through the inner cavity of the locking groove 411 for locking and fixing. Multiple sets of guide strips 412 for guiding are vertically arranged on the inner side wall of the connecting tube 41 near the top. An internal thread 413 for installing the limiting end cap 42 is provided on the inner side wall of the top of the connecting tube 41. A hollow connector is provided at the bottom of the limiting end cap 42, and an external thread that cooperates with the internal thread 413 is provided on the outer side of the connector. The mutual cooperation of the internal thread 413 and the external thread facilitates the installation and disassembly of the limiting end cap 42 and the connecting tube 41. The pressing assembly 43 includes a pressing push rod 431 with threads at both ends. A through hole is vertically provided in the middle of the limiting end cap 42, allowing the pressing push rod 431 to pass through the through hole and through the limiting end cap 42. A guide slider 432 is provided in the middle of the outer side of the pressing assembly 43 for guidance. The outer side wall of the guide slider 432 has a guide groove 435 that matches the guide strip 412. By sliding along the guide strip 412 using the guide groove 435, the pressing push rod 431 can be prevented from rotating during the pushing process, thereby preventing the elastic assembly 4 from rotating. The outer side plate of 4 cannot accurately pass through the inner cavity of the tooth groove 411. A limit stop 433 is provided near the top of the pressing push rod 431, and the limit stop 433 can be installed in the inner cavity of the limit end cap 42 connector to prevent the elastic component 44 from being pushed out of the inner cavity of the tooth groove 411 due to the elastic force of the compression spring 45. A pressing plate 434 for pressing is fixed to the top of the pressing push rod 431 by thread to increase the contact area with the hand and reduce the hand pain caused by the reaction force of pressing. The elastic assembly 44 comprises a support block 441, a plurality of elastic clamps 442 matched with the toothed grooves 411 are welded and fixed on the outer side wall of the support block 441, and the elastic clamps 442 have elasticity and can be shrunk into the inner cavity of the connecting spout 41 through the toothed grooves 411 due to extrusion or pressing, and the elastic clamps 442 can be popped out from the inner cavity of the toothed grooves 411 due to elasticity, for clamping into the inner cavity of the stepped hole 11 (the elastic clamps 442 are made of 60Si2Mn spring steel material, the thickness is 1.5-2mm, the elastic limit of a single elastic clamp 442 is 100-120N, the maximum shrinkage is 5-8mm when extruded, the clamping depth after popping out is 3-5mm, and the connection strength of the connecting assembly 4 can meet the stress requirement when the valve works, and the longitudinal tension can be greater than 200N), a threaded connecting sleeve 443 is welded on the top of the support block 441, the threaded connecting sleeve 443 and the bottom end of the pressing push rod 431 are screwed with each other, so that the elastic assembly 44 and the pressing assembly 43 can be conveniently installed and disassembled, and a connecting block 444 for clamping the compression spring 45 is arranged at the bottom of the support block 441, the connecting block 444 can be inserted into the inner cavity of the compression spring 45, so that the compression spring 45 is fixed at the bottom of the support block 441. When the valve top cover 3 needs to be disassembled, the worker presses the top end of the pressing plate 434 of the pressing assembly 43 downward with fingers or a special pressing tool, so that the pressing push rod 431 moves downward, drives the elastic assembly 44 to compress the compression spring 45, at this time, the outer side plate of the elastic clamp 442 is shrunk into the inner cavity of the connecting spout 41 under the action of the pressing push rod 431, the limiting end cap 42 at the top end of the connecting spout 41 is held, and the connecting spout 41 is pulled out upward, so that the disassembly of a single connecting assembly 4 is completed, and after the four connecting assemblies 4 are disassembled in sequence, the valve top cover 3 can be taken off from the top of the valve middle cover 2. After disassembly, the parts of the connecting assembly 4 remain in the assembled state and do not need to be disassembled, and can be directly used for next installation, if it is found that the parts are damaged (such as deformation of the elastic clamp 442 and failure of the compression spring 45), the damaged parts can be replaced individually.

[0023] In order to replace the valve top cover 3 without the need for the worker to press the valve middle cover 2 with hands to be fixed on the top of the valve main body 1, so as to maintain the sealing of the top of the diaphragm 6, such as Figures 9-11As shown, the fixing insertion hole 14 is symmetrically arranged on the two opposite side walls of the valve body 1 and the valve middle cover 2, and the fixing fastener 13 for connection is arranged on the fixing insertion hole 14 of the side wall of the valve body 1 and the valve middle cover 2, wherein the fixing fastener 13 comprises a I-shaped clamping plate 131, the fixing insertion block 132 matched with the fixing insertion hole 14 is welded on the four corners of one side wall of the I-shaped clamping plate 131, and the U-shaped handle 133 is welded on the side wall of the I-shaped clamping plate 131 opposite to the fixing insertion block 132; the valve body 1 and the valve middle cover 2 are connected as a whole in the mode that the fixing insertion block 132 is inserted into the inner cavity of the fixing insertion hole 14, so that when the valve top cover 3 is disassembled, the staff does not need to press the valve middle cover 2 to fix it on the top of the valve body 1.

[0024] The above-mentioned embodiments are only the preferred embodiments of the present application, and cannot be used to limit the protection scope of the present application, and any non-essential changes and replacements made by the person skilled in the art on the basis of the present application shall fall within the protection scope of the present application.

Claims

1. A replaceable hand-operated normally closed diaphragm valve, comprising a valve body (1), a valve middle cover (2), a valve top cover (3), a connecting assembly (4), a valve handle (5), a diaphragm (6), a valve screw (7), a torque nut (8), a torque limiting buckle (9) and a locking ring (10); The inner cavity of the valve body (1) is provided with a diaphragm (6) for controlling the flow, the top of the diaphragm (6) is provided with a valve screw (7) for controlling the axial up and down movement, the valve middle cover (2) is installed on the top of the valve body (1) for sealing the top of the diaphragm (6), and the top of the valve screw (7) penetrates the inner cavity of the valve middle cover (2); The torque nut (8) is sleeved on the outer wall of the valve screw (7), and the torque nut (8) and the valve screw (7) are connected by threads, the valve top cover (3) is sleeved on the outside of the torque nut (8) and installed on the top of the valve middle cover (2), the locking ring (10) is sleeved on the top end of the torque nut (8), and the locking ring (10) rotates with the rotation of the torque nut (8), the outer side plate of the locking ring (10) is provided with locking teeth, and the inner cavity side wall of the valve top cover (3) is provided with limiting teeth matched with the locking teeth; The valve handle (5) is installed in the inner cavity of the top end of the torque nut (8), and rotating the valve handle (5) can drive the valve screw (7) to move axially and the torque nut (8) to rotate synchronously, the bottom end of the valve handle (5) is an octagonal column structure, and the torque limiting buckle (9) is clamped on the side wall of the bottom end of the valve handle (5), when the transmission torque is too large, the torque limiting buckle (9) will be deformed and open outward, at this time the bottom end of the valve handle (5) and the torque limiting buckle (9) will rotate relative to each other by mutual friction, thereby limiting the torque; When the valve needs to be locked, manually rotate the locking ring (10) to make the locking teeth on the outer wall of the locking ring (10) engage with the limiting teeth on the inner cavity side wall of the valve top cover (3), thereby limiting the rotation of the nut (5) and achieving the locking of the valve position; The valve body (1), the valve middle cover (2) and the valve top cover (3) are connected as a whole by the connecting assembly (4).

2. The normally closed change-out hand diaphragm valve of claim 1, wherein, The connecting assembly (4) comprises a connecting pipe (41), a limiting end cap (42), a pressing assembly (43), a elastic assembly (44) and a compression spring (45); The limiting end cap (42) is installed on the top of the connecting pipe (41) by threads, the elastic assembly (44) is installed at the bottom end of the pressing assembly (43) by threads, and the compression spring (45) is installed at the bottom of the pressing assembly (43); The pressing assembly (43) is installed in the inner cavity of the connecting pipe (41), and the elastic assembly (44) and the compression spring (45) are synchronously installed in the inner cavity of the connecting pipe (41), the top end of the connecting pipe (41) penetrates the limiting end cap (42), and the outer side plate of the elastic assembly (44) penetrates the side wall of the connecting pipe (41).

3. The normally closed change-out hand diaphragm valve of claim 2, wherein, The valve body (1) has stepped holes (11) at the top four corners, with the larger hole at the bottom and the smaller hole at the top. The valve cover (2) and valve top cover (3) are provided with through-holes (12) at the top four corners. The connecting holes (12) and the stepped holes (11) are axially aligned. The connecting tube (41) can be inserted into the inner cavity of the connecting holes (12) and the stepped holes (11). Pressing the pressing component (43) can cause the elastic component (44) to pop out and lock into the inner cavity of the stepped holes (11).

4. The normally closed change-out hand diaphragm valve of claim 2, wherein, The connecting tube (41) is a hollow tube with a closed bottom and an open top. Multiple sets of toothed grooves (411) are evenly opened on the side wall of the connecting tube (41) near the bottom. Multiple sets of guide strips (412) are provided on the inner side wall of the connecting tube (41) near the top. The inner side wall of the top of the connecting tube (41) is provided with internal threads (413).

5. The normally closed change-out hand diaphragm valve of claim 4 wherein, The pressing assembly (43) includes a pressing push rod (431) with threads at both ends. A guide slider (432) is provided in the middle of the outer side of the pressing push rod (431). A guide groove (435) matching the guide strip (412) is provided on the outer side wall of the guide slider (432). A limiting baffle (433) is provided near the top of the pressing push rod (431). The top of the pressing push rod (431) is fixed to the pressing plate (434) by threads.

6. The normally closed change-out hand diaphragm valve of claim 5 wherein, The bottom of the limiting end cap (42) is provided with a hollow connector, and the outer side of the connector is provided with an external thread that mates with the internal thread (413). The middle part of the limiting end cap (42) has a through hole for the pressing push rod (431) to pass through. The limiting baffle (433) can be embedded in the inner cavity of the connector of the limiting end cap (42).

7. The normally closed change-out hand diaphragm valve of claim 5 wherein, The elastic component (44) includes a support block (441), with multiple sets of elastic clips (442) that match the tooth groove (411) welded to the outer wall of the support block (441), a threaded connecting sleeve (443) welded to the top of the support block (441), and a connecting block (444) provided at the bottom of the support block (441); the connecting sleeve (443) is threadedly connected to the bottom end of the pressing push rod (431), and the connecting block (444) can be embedded in the inner cavity of the compression spring (45).

8. The normally closed change-out hand diaphragm valve of claim 1 wherein, The valve body (1) and the valve cover (2) have symmetrically opened fixing holes (14) on their opposite side walls, and a fixing fastener (13) is installed between the valve body (1) and the fixing holes (14) on the valve cover (2).

9. The normally closed change-out hand diaphragm valve of claim 8, wherein, The fixing fastener (13) includes an I-shaped clamp (131), a fixing block (132), and a U-shaped handle (133). The fixing block (132) is welded to the four corners of one side of the I-shaped plate (131), and the U-shaped handle (133) is welded to the other side of the I-shaped plate (131). The fixing block (132) can be inserted into the fixing hole (14) to fix the valve body (1) and the valve cover (2).

10. The normally closed change-out hand diaphragm valve of claim 1 wherein, The valve handle (5) is marked with "OPEN" and "CLOSE" and corresponding rotating arrows on the top, allowing the diaphragm (6) to be observed from the outside of the valve.

Images