Diaphragm valve

Abstract

The invention relates to a diaphragm valve which is characterized in that the diaphragm valve comprises a valve body, a valve cover and a diaphragm piece, and the diaphragm piece and the valve cover cover a valve cavity; the diaphragm is used for controlling connection and disconnection of the input pipe and the output pipe; the pressing block is used for abutting against the diaphragm piece so that the diaphragm piece can control connection and disconnection of the input pipe and the output pipe. When the main valve rod moves, the main valve rod can abut against the pressing block so that the pressing block can abut against the diaphragm piece. The hand wheel is connected with the main valve rod and used for driving the main valve rod to rotate; when the hand wheel and the main valve rod rotate, the hand wheel moves in the axial direction of the main valve rod; the boss of the valve cover is located in the moving direction of the hand wheel, and the hand wheel is blocked by the boss when making contact with the boss. The diaphragm valve is convenient to use, safe and reliable.

Description

Technical Field

[0001] The invention relates to a diaphragm valve. Background Art

[0002] The principle of the diaphragm valve is based on a diaphragm made of an elastomer, which is controlled manually or through other operations to ultimately close and open the valve. Through this design, the fluid medium such as liquid or gas only contacts the valve body and the diaphragm, and does not contact other materials of the valve.

[0003] However, the existing diaphragm valve cannot display the stroke of the main valve stem when in use, resulting in the user being unable to know the extent of the valve opening. When the main valve stem cannot continue to move and the passage is not completely cut off, the existing diaphragm valve cannot adjust the pressure on the diaphragm to completely cut off the passage. On the other hand, it cannot limit the opening of the valve, which is inconvenient to use. In addition, when the diaphragm valve is opened to the required extent, there is no limit on the hand wheel, which may cause the hand wheel to be misoperated or loose, affecting use. Summary of the invention

[0004] One of the purposes of the present invention is to overcome the deficiencies in the prior art and provide a diaphragm valve that is more convenient to use.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] The diaphragm valve is characterized by comprising:

[0007] A valve body, wherein the valve body is provided with an input pipe, a valve cavity and an output pipe, and the input pipe and the output pipe are both connected to the valve cavity;

[0008] A valve cover, the valve cover comprises a bottom plate and a boss, the boss is connected to the bottom plate and protrudes from the bottom plate; the valve cover is provided with a first cavity; the valve cover is connected to the valve body;

[0009] A diaphragm, the diaphragm is connected to the valve cover and seals the first cavity, and the diaphragm and the valve cover cover the valve cavity; the diaphragm is used to control the connection and disconnection of the input pipe and the output pipe;

[0010] A pressing block, the pressing block is movably disposed in the first cavity, and the pressing block is used to press against the diaphragm so that the diaphragm controls the connection and disconnection between the input pipe and the output pipe;

[0011] A main valve stem, wherein the main valve stem passes through the valve cover, one end of the main valve stem is located in the first cavity, and the other end extends out of the first cavity, and the main valve stem is threadedly engaged with the valve cover; when the main valve stem moves, it can abut against the pressure block so that the pressure block abuts against the diaphragm;

[0012] A hand wheel, the hand wheel is connected to the main valve stem and is used to drive the main valve stem to rotate; when the hand wheel and the main valve stem rotate, the hand wheel moves along the axial direction of the main valve stem;

[0013] The boss of the valve cover is located in the moving direction of the hand wheel, and the hand wheel is blocked by the boss when contacting the boss.

[0014] According to one embodiment of the present invention, it also includes a stroke indicator, which is tubular; a guide tube is provided on the boss, the guide tube is connected to the boss and protrudes from the boss, the guide tube and / or the boss are threadedly matched with the main valve stem; the stroke indicator is sleeved on the guide tube.

[0015] According to one embodiment of the present invention, the connection structure between the travel indicator and the guide tube is a tenon and a first groove; one of the tenon and the first groove is arranged on the travel indicator, and the other is arranged on the guide tube; the tenon is inserted into the first groove.

[0016] According to one embodiment of the present invention, it also includes a locking device, the outer wall of the stroke indicator is provided with a plurality of second grooves, and the plurality of second grooves are distributed along the circumferential direction; the handwheel is mounted outside the stroke indicator and can move relative to the stroke indicator; the locking device is connected to the handwheel and is relatively movable with the handwheel; the locking device passes through the handwheel and can be inserted into the second groove of the stroke indicator when it is movable; when the locking device is inserted into the second groove, the stroke indicator and the locking device restrict the rotation of the handwheel.

[0017] According to one embodiment of the present invention, the locking device includes a sleeve locking device, a locking spring and a locking needle; the locking needle is connected to the sleeve locking device through the locking spring; the sleeve locking device is threadedly connected to the handwheel; the locking needle passes through the handwheel and can move radially along the handwheel; when the sleeve locking device rotates, the locking needle is driven to move radially along the handwheel by the locking spring; when the locking needle moves radially along the handwheel, it can be inserted into the second groove of the stroke indicator and set; when the locking needle is inserted into the second groove, the rotation of the handwheel is restricted.

[0018] According to one embodiment of the present invention, a boss is provided on the handwheel, and the boss protrudes from the handwheel; the boss is provided with a radial through hole, and the radial through hole passes through the boss and the handwheel; the sleeve locking device is threadedly connected to the boss; the locking needle is located in the radial through hole and is movably arranged.

[0019] According to one embodiment of the present invention, a drive cover assembly is provided on the handwheel, and the drive cover assembly includes a drive cover and a toothed washer, the toothed washer is connected to the drive cover; the toothed washer is connected to the handwheel; the main valve stem passes through the toothed washer and the drive cover, and when the handwheel rotates, the toothed washer is driven to rotate through the drive cover, and when the toothed washer rotates, the main valve stem is driven to rotate.

[0020] According to one embodiment of the present invention, the driving cover includes a cover plate and a connecting column; a plug pin is provided on the connecting column; the connecting column is connected to the cover plate and protrudes from the cover plate, and the plug pin passes through the toothed washer to connect the toothed washer to the driving cover.

[0021] According to one embodiment of the present invention, a third countersunk hole is provided at one end of the handwheel, and a fourth countersunk hole is provided at the other end, and the drive cover is partially inserted into the fourth countersunk hole; the toothed washer is provided with a plurality of teeth, and the plurality of teeth are distributed along the circumferential direction; and the plurality of teeth are clamped in the fourth countersunk hole.

[0022] According to one embodiment of the present invention, a plurality of protrusions are arranged at intervals in the fourth countersunk hole, and the plurality of protrusions are distributed along the circumferential direction; the teeth of each toothed washer are located between two protrusions; the teeth cooperate with the protrusions to connect the toothed washer and the handwheel in a linkage rotation.

[0023] According to an embodiment of the present invention, the main valve stem is provided with a first flange, and the first flange is located in the valve cavity; when the main valve stem moves, the first flange is blocked by the valve cover to limit the stroke of the main valve stem.

[0024] According to one embodiment of the present invention, it also includes a stroke limiting valve stem, which passes through the main valve stem and has both ends protruding from the main valve stem; the stroke limiting valve stem is threadedly connected to the main valve stem; one end of the stroke limiting valve stem is connected to the pressure block, and the other end protrudes out of the handwheel.

[0025] According to one embodiment of the present invention, the pressure block includes a chassis and a connecting pipe; the connecting pipe is connected to the chassis and protrudes from the chassis; the connecting pipe is provided with a second cavity; the side wall of the connecting pipe is provided with a first opening; the end of the connecting pipe is provided with a second opening; the first opening and the second opening are both connected to the second cavity; the end of the stroke limiting valve stem is provided with a second flange; the second flange can enter the cavity from the first notch and exit from the second cavity, the second flange is larger than the second opening, and the second flange can be movably arranged in the second cavity; the stroke limiting valve stem extends out of the second cavity from the second opening; when the stroke limiting valve stem moves axially, the second flange presses or pulls the pressure block to move the pressure block.

[0026] According to one embodiment of the present invention, a drive cover assembly is provided on the handwheel, the stroke limiting valve stem passes through the handwheel and the drive cover assembly, and one end of the stroke limiting valve stem extending outside the drive cover assembly is connected to a nut.

[0027] According to one embodiment of the present invention, the color of the travel indicator is different from the color of the hand wheel and the valve cover.

[0028] According to an embodiment of the present invention, the color of the travel indicator is red.

[0029] In the diaphragm valve of the present invention, the handwheel is sleeved outside the stroke indicator, so when the handwheel moves along the axial direction of the main valve stem, the exposed amplitude of the stroke indicator will change, so the user can judge the opening amplitude of the diaphragm valve according to the height of the stroke indicator seen. The handwheel moves downward and cannot move further when it hits the boss, so the boss of the valve cover can limit the stroke of the handwheel and provide a stopping function for the handwheel. When the main valve stem pushes the pressure block downward to the lowest point and still cannot make the elastic diaphragm close to the valve weir to isolate the valve cavity, the nut is rotated to move it away from the drive cover, and then the stroke limiting valve stem can be rotated to make it push against the pressure block, and then push against the elastic diaphragm, so that the elastic diaphragm is close to the valve weir. When the main valve stem moves upward, the pressure block releases the pressure on the elastic diaphragm, and the elastic diaphragm is opened to the maximum amplitude, and the stroke limiting valve stem is rotated to move downward, and the elastic diaphragm can be pressed by the pressure block to reduce the opening of the elastic diaphragm, thereby adjusting the opening amplitude of the diaphragm valve. Therefore, the present invention can use the main valve stem and the stroke limiting valve stem to adjust the opening of the elastic diaphragm respectively. The stroke limiting valve stem provides a supplementary closing function when the main valve stem cannot completely close the diaphragm valve. It is easy to use and safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the diaphragm valve in the present invention.

[0031] Figure 2It is a schematic diagram of the top view of the diaphragm valve in the present invention.

[0032] Figure 3 for Figure 2 AA section view.

[0033] Figure 4 It is a schematic diagram of the local structure of the diaphragm valve in the present invention.

[0034] Figure 5 For the present invention Figure 4 Schematic diagram of the diaphragm valve structure after removing the stroke indicator.

[0035] Figure 6 It is another partial structural schematic diagram of the diaphragm valve in the present invention.

[0036] Figure 7 It is a schematic diagram of the valve cover structure in the present invention.

[0037] Figure 8 It is a schematic diagram of the structure of the diaphragm sheet in the present invention.

[0038] Fig. 9 It is a schematic diagram of the briquetting structure in the present invention.

[0039] Fig.10 It is a schematic diagram of the main valve stem and the stroke limiting valve stem structure in the present invention.

[0040] Fig.11 It is a schematic diagram of the matching relationship between the travel indicator and the locking device in the present invention.

[0041] Fig.12 It is a schematic diagram of the hand wheel structure in the present invention.

[0042] Fig.13 This is a schematic diagram of the structure of the hand wheel in the present invention observed from another angle.

[0043] Fig.14 It is a schematic diagram of the structure of the locking device in the present invention.

[0044] Fig.15 It is a schematic diagram of the structure of the driving cover assembly in the present invention. DETAILED DESCRIPTION

[0045] like Figures 1 to 6As shown, the diaphragm valve 100 includes a valve body 110, a valve cover 120, a diaphragm 130, a pressing block 140, a main valve stem 150 and a hand wheel 160. The valve body 110 is provided with an input pipe 111, a valve cavity 112 and an output pipe 113, and the input pipe 111 and the output pipe 113 are both connected to the valve cavity 112. The diaphragm 130 and the pressing block 140 are arranged in the valve cavity 112. When the hand wheel 160 drives the main valve stem 150 to rotate, it can move along the axial direction of the main valve stem 150. When the main valve stem 150 moves along the axial direction, it abuts against the diaphragm 130 or relaxes the abutment against the diaphragm 130, so that the diaphragm 130 controls the connection and disconnection of the input pipe 111 and the output pipe 113.

[0046] A valve weir 114 is provided in the valve cavity 112 of the valve body 110. The periphery of the diaphragm 130 is connected to the valve cover 120, and the valve cover 120 is connected to the valve body 110 to seal the valve cavity 112. When the diaphragm 130 is pressed against the valve weir 114, the input pipe 111 and the output pipe 113 are cut off. When the diaphragm 130 is not pressed against the valve weir 114, the input pipe 111 and the output pipe 113 are connected.

[0047] like Figures 1 to 6 As shown, the valve cover 120 includes a bottom plate 121, a boss 122 and a guide tube 123. The boss 122 is connected to the bottom plate 121 and protrudes from the bottom plate 121. The guide tube 123 is arranged on the boss 122 and protrudes from the boss 122. The guide tube 123 is tubular, with an inner wall provided with an internal thread and an outer wall provided with a first groove 124. The valve cover 120 is provided with a first cavity 125. The inner wall of the boss 122 is provided with a guide rib 126.

[0048] like Figures 1 to 7 , Figure 8 As shown, the diaphragm 130 includes a mounting plate 131 and an elastic diaphragm 132. The mounting plate 131 is arranged around the elastic diaphragm 132 and connected to the elastic diaphragm 132. A round table 133 is arranged in the middle of the elastic diaphragm 132. The round table 133 is connected to a flexible suspension 135 through a screw rod 134.

[0049] The bottom plate 121 and the mounting plate 131 are connected to the valve body 110. The mounting plate 131 is located between the bottom plate 121 and the valve body 110. The elastic diaphragm 130 covers the first cavity 125 and the valve cavity 112.

[0050] like Figure 3 , Figure 6 , Fig. 9As shown, the structure of the pressing block 140 includes a chassis 141 and a connecting pipe 142; the connecting pipe 142 is connected to the chassis 141 and protrudes from the chassis 141. The pressing block 140 is provided with a second cavity 143. The side wall 144 of the connecting pipe 142 is provided with a first opening 145; the end 146 of one end of the connecting pipe 142 is provided with a second opening 147. The first opening 145 and the second opening 147 are both connected to the second cavity 143. The chassis 141 is provided with a first countersunk hole 1411. The depth of the first countersunk hole 1411 can be determined according to actual needs, for example, it can extend to the connecting pipe 142. A first through hole 1412 is provided in the first countersunk hole 1411. A second countersunk hole 1413 is provided in the second cavity 143. The first through hole 1412 connects the first countersunk hole 1411 with the second countersunk hole 1413. The pressing block 140 is also provided with a guide groove 148. The guide groove 148 is connected to the bottom plate 141 and the connecting pipe 142 .

[0051] The pressing block 140 is located in the second cavity 143 and can move in the second cavity 143, and the guide rib 126 is inserted in the guide groove 148 and can slide in the guide groove 148. The guide rib 126 cooperates with the guide groove 148 to limit the pressing block 140 and the valve cover 120 from relative rotation and can only move linearly relative to each other. The truncated cone 133 of the elastic diaphragm 132 is located in the first counterbore 1412, and the screw 134 passes through the pressing block 140 from the first through hole 1412. The flexible suspension 135 is located in the second counterbore 1413, and the elastic diaphragm 132 is connected to the pressing block 140 through the flexible suspension 135.

[0052] like Figure 3 , 4 As shown in FIGS. 5, 8 and 10, the diaphragm valve 100 further includes a stroke limiting valve stem 170. The stroke limiting valve stem 170 is a screw, and a second flange 171 is provided at the end thereof. The second flange 171 can enter and exit the second cavity 143 from the first opening 145. The second flange 171 is larger than the first opening 147 and cannot exit the second cavity 143 from the second opening 147. The stroke limiting valve stem 170 extends out of the second cavity 143 from the second opening 147. When the second flange 171 is located in the second cavity 143, it can move in the second cavity 143.

[0053] When the stroke limiting valve stem 170 moves in the axial direction, the second flange 171 can abut against the pressing block 140 and the elastic suspension 135 , thereby causing the pressing block 140 and the elastic suspension 135 to abut against the elastic diaphragm 132 .

[0054] like Figure 3 , 4As shown in Figures 5, 6 and 10, the main valve stem 150 is provided with an external thread and a lumen, and the lumen is provided with an internal thread. A first flange 151 is provided at the end of the main valve stem 150. The main valve stem 150 is sleeved on the stroke limiting valve stem 170, and the two are threadedly matched, and both ends of the stroke limiting valve stem 170 protrude from the main valve stem 150. The main valve stem 150 passes through the guide tube 123 and the guide tube 123 is threadedly matched, and the first flange 151 is located in the first cavity 125. The first flange 151 is located above the pressing block 140. When the main valve stem 150 moves axially, the first flange 151 can abut against the end 146 of the connecting tube 142 to move the pressing block 140.

[0055] like Figure 3 , 4 As shown in FIGS. 11 and 12 , the travel indicator 180 is tubular, and a tongue 181 is provided on the inner wall. A plurality of second grooves 182 are provided at one end of the travel indicator 180. The plurality of second grooves 182 are distributed in a circle along the outer wall of the travel indicator 180. The other end of the travel indicator 180 is sleeved on the guide tube 123, and the tongue 181 is inserted into the first groove 124, so that the travel indicator 180 is connected to the guide tube 123 by clamping. In this embodiment, the travel indicator 180 adopts a striking color, such as red. Moreover, the color of the travel indicator 180 is different from that of the valve cover 120 and the hand wheel 160.

[0056] like Figure 1 , 2 As shown in Figures 3, 12, and 13, the handwheel 160 is cylindrical in shape, and a third countersunk hole 161 is provided at one end along the axial direction, and a fourth countersunk hole 162 is provided at the other end. A section of extension tube 163 is provided in the third countersunk hole 161. The extension tube 163 protrudes from the bottom wall of the third countersunk handwheel 161. The outer diameter of the extension tube 163 is smaller than the diameter of the third countersunk hole 161. The handwheel 160 is also provided with a through hole 164. The through hole 164 extends from the bottom wall of the fourth countersunk hole 162 to the end of the extension tube 163, and connects the third countersunk hole 161 and the fourth countersunk hole 162. An internal thread is provided in the through hole 164. A plurality of protrusions 167 are arranged at intervals on the bottom wall 166 of the fourth countersunk hole 162. A boss (not shown in the figure) is provided on the outer wall of the handwheel 160. The boss is provided with a radial through hole 168. The radial through hole 168 extends to communicate with the third through hole 161.

[0057] The hand wheel 160 is sleeved outside the stroke indicator 180, and the two can move relative to each other. One end of the stroke indicator 180 is located in the third counterbore 161 and between the inner wall of the hand wheel 160 and the extension tube 163. The main valve stem 150 passes through the hand wheel 160 through the through hole 164, and the external thread of the main valve stem 150 matches the internal thread in the through hole 164.

[0058] like Fig.14As shown, the locking device 190 includes a sleeve locking device 191, a locking spring 192 and a locking needle 193. The sleeve locking device 191 is threadedly connected to the boss 165. One end of the locking spring 192 is connected to the sleeve locking device 191, and the other end is connected to the locking needle 193. The locking spring 192 is sleeved on the locking needle 193. The locking needle 193 is arranged in the radial through hole 168 and is movable. The locking needle 193 passes through the hand wheel 160 and can move along the radial direction of the hand wheel 160.

[0059] When the sleeve locking device 191 rotates, the locking pin 193 is driven by the locking spring 192 to move radially along the hand wheel 160. When the locking pin 193 moves radially along the hand wheel 190, it can be inserted into the second groove 182 of the stroke indicator 180. When the locking pin 193 is inserted into the second groove 182, the rotation of the hand wheel 160 can be restricted.

[0060] like Fig.15 As shown, the diaphragm valve 100 further includes a drive cover assembly 102. The drive cover assembly 102 includes a drive cover 103 and a toothed washer 104. The drive cover 103 includes a cover plate 105 and a connecting column 106. The connecting column 106 is connected to the cover plate 105 and protrudes from the cover plate 105. A plug pin 107 is provided at the end of the connecting column 106. A circle of teeth 108 is provided on the periphery of the toothed washer 104. The plug pin 107 penetrates the toothed washer 104 to connect the toothed washer 104 and the connecting column 106 together.

[0061] The connecting column 106 is located in the fourth countersunk hole 162, and the drive cover 103 is tightly connected with the hand wheel 160. The teeth 108 of the toothed washer 104 are distributed between the protrusions 167, which can limit the relative rotation of the toothed washer 104 and the hand wheel 160. The toothed washer 104 is mounted on the main valve stem 150 and rotates in conjunction with the main valve stem 150. When the hand wheel 160 rotates, the toothed washer 104 is driven to rotate through the drive cover 103, and when the toothed washer 104 rotates, the main valve stem 150 is driven to rotate. The stroke limiting valve stem 170 passes through the cover plate 105 of the drive cover 103. A nut 172 is provided on the stroke limiting valve stem 170. When the nut 172 is screwed, it can abut against the cover plate 105 of the drive cover 103.

[0062] When the diaphragm valve 100 of the present invention is used, the driving cover 103 and the toothed gasket 104 can be used to drive the main valve stem 150 to rotate when the hand wheel 160 is rotated. The main valve stem 150 is threadedly connected to the valve cover 120 and the valve cover 120 is fixed, so when the main valve stem 150 rotates, it will move axially. When the main valve stem 150 moves axially, the first flange 171 presses against the pressure block 140, and the pressure block 140 presses against the elastic diaphragm 132, pressing the elastic diaphragm 132 against the valve weir 114, isolating the valve cavity 112, and cutting off the connection between the input pipe 111 and the output pipe 113. Reverse rotation of the hand wheel 160 can release the pressure block 140 from pressing against the elastic diaphragm 132, the valve cavity 112 is opened, and the input pipe 111 is connected with the output pipe 113.

[0063] The hand wheel 160 is sleeved outside the stroke indicator 180. Therefore, when the hand wheel 180 moves along the axial direction of the main valve stem 150, the exposed range of the stroke indicator 180 will change. Therefore, the user can judge the opening range of the diaphragm valve 100 according to the height of the stroke indicator 180 seen. Figure 1 As shown, the hand wheel 160 moves downward and cannot move further when it abuts against the boss 122. Therefore, the boss 122 of the valve cover 120 can limit the stroke of the hand wheel 160 and provide a stop function for the hand wheel 160. When the main valve stem 150 abuts against the pressing block 140 downward to the lowest point and still cannot make the elastic diaphragm 132 close to the valve weir 114 to block the valve cavity 112, the nut 172 is rotated to make the nut 172 away from the drive cover 103, and then the stroke limiting valve stem 170 can be rotated to abut against the pressing block 140, and then against the elastic diaphragm 132, so that the elastic diaphragm 132 is close to the valve weir 114. Figure 3 As shown, when the main valve stem 150 moves upward, the pressing block 140 releases the pressure on the elastic diaphragm 132, so that the elastic diaphragm 132 opens to the maximum extent, and the stroke limiting valve stem 170 is rotated to move it downward, and the elastic diaphragm 132 can be pressed by the pressing block 140 to reduce the opening of the elastic diaphragm 132, thereby adjusting the opening extent of the diaphragm valve 100. Therefore, the present invention can use the main valve stem and the stroke limiting valve stem to adjust the opening of the elastic diaphragm respectively, and the stroke limiting valve stem provides a supplementary closing function when the main valve stem cannot completely close the diaphragm valve, which is convenient to use and safe and reliable.

[0064] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent substitution or improvement within the spirit of the present invention is included in the scope of the claims of the present invention.

Claims

1. Diaphragm valve, characterized in that, include: A valve body, wherein the valve body is provided with an input pipe, a valve cavity and an output pipe, and the input pipe and the output pipe are both connected to the valve cavity; A valve cover, the valve cover comprises a bottom plate and a boss, the boss is connected to the bottom plate and protrudes from the bottom plate; the valve cover is provided with a first cavity; the valve cover is connected to the valve body; A diaphragm, the diaphragm is connected to the valve cover and seals the first cavity, and the diaphragm and the valve cover cover the valve cavity; the diaphragm is used to control the connection and disconnection of the input pipe and the output pipe; A pressing block, the pressing block is movably disposed in the first cavity, and the pressing block is used to press against the diaphragm so that the diaphragm controls the connection and disconnection between the input pipe and the output pipe; A main valve stem, wherein the main valve stem passes through the valve cover, one end of the main valve stem is located in the first cavity, and the other end extends out of the first cavity, and the main valve stem is threadedly engaged with the valve cover; when the main valve stem moves, it can abut against the pressure block so that the pressure block abuts against the diaphragm; A hand wheel, the hand wheel is connected to the main valve stem and is used to drive the main valve stem to rotate; when the hand wheel and the main valve stem rotate, the hand wheel moves along the axial direction of the main valve stem; The boss of the valve cover is located in the moving direction of the hand wheel, and the hand wheel is blocked by the boss when contacting the boss.

2. The diaphragm valve according to claim 1, characterized in that: It also includes a stroke indicator, which is tubular; a guide tube is provided on the boss, the guide tube is connected to the boss and protrudes from the boss, the guide tube and / or the boss are threadedly matched with the main valve stem; the stroke indicator is sleeved on the guide tube.

3. The diaphragm valve according to claim 2, characterized in that: The connection structure between the travel indicator and the guide tube is a tenon and a first groove; one of the tenon and the first groove is arranged on the travel indicator, and the other is arranged on the guide tube; the tenon is inserted into the first groove.

4. The diaphragm valve according to claim 2, characterized in that: It also includes a locking device, the outer wall of the stroke indicator is provided with a plurality of second grooves, and the plurality of second grooves are distributed along the circumferential direction; the handwheel is mounted outside the stroke indicator and can move relative to the stroke indicator; the locking device is connected to the handwheel and is relatively movable with the handwheel; the locking device passes through the handwheel and can be inserted into the second groove of the stroke indicator when it is movable; when the locking device is inserted into the second groove, the stroke indicator and the locking device restrict the rotation of the handwheel.

5. The diaphragm valve according to claim 4, characterized in that: The locking device includes a sleeve locking device, a locking spring and a locking needle; the locking needle is connected to the sleeve locking device through the locking spring; the sleeve locking device is threadedly connected to the handwheel; the locking needle penetrates the handwheel and can move radially along the handwheel; when the sleeve locking device rotates, the locking needle is driven to move radially along the handwheel by the locking spring; when the locking needle moves radially along the handwheel, it can be inserted into the second groove of the travel indicator and set; when the locking needle is inserted into the second groove, the rotation of the handwheel is restricted.

6. The diaphragm valve according to claim 5, characterized in that: The handwheel is provided with a boss, which protrudes from the handwheel; the boss is provided with a radial through hole, which passes through the boss and the handwheel; the sleeve locking device is threadedly connected to the boss; the locking needle is located in the radial through hole and is movably arranged.

7. The diaphragm valve according to claim 1, characterized in that: The handwheel is provided with a driving cover assembly, which includes a driving cover and a toothed washer, wherein the toothed washer is connected to the driving cover; the toothed washer is connected to the handwheel; the main valve stem passes through the toothed washer and the driving cover, and when the handwheel rotates, the toothed washer is driven to rotate through the driving cover, and when the toothed washer rotates, the main valve stem is driven to rotate.

8. The diaphragm valve according to claim 7, characterized in that: The driving cover comprises a cover plate and a connecting column; a plug pin is arranged on the connecting column; the connecting column is connected to the cover plate and protrudes from the cover plate, and the plug pin penetrates the toothed washer to connect the toothed washer with the driving cover.

9. The diaphragm valve according to claim 7, characterized in that: A third countersunk hole is set at one end of the hand wheel, and a fourth countersunk hole is set at the other end, and the drive cover is partially inserted into the fourth countersunk hole; the toothed washer is provided with a plurality of teeth, and the plurality of teeth are distributed along the circumferential direction; the plurality of teeth are clamped in the fourth countersunk hole.

10. The diaphragm valve according to claim 9, characterized in that: A plurality of protrusions are arranged at intervals in the fourth counterbore, and the plurality of protrusions are distributed along the circumferential direction; the teeth of each toothed washer are located between two protrusions; the teeth cooperate with the protrusions to connect the toothed washer with the hand wheel for linkage rotation.

11. The diaphragm valve according to claim 1, characterized in that: The main valve stem is provided with a first flange, and the first flange is located in the valve cavity; when the main valve stem moves, the first flange is blocked by the valve cover to limit the stroke of the main valve stem.

12. The diaphragm valve according to claim 1, characterized in that: It also includes a stroke limiting valve stem, which passes through the main valve stem and has two ends protruding from the main valve stem; the stroke limiting valve stem is threadedly connected to the main valve stem; one end of the stroke limiting valve stem is connected to the pressure block, and the other end protrudes out of the hand wheel.

13. The diaphragm valve according to claim 12, characterized in that: The pressure block includes a chassis and a connecting pipe; the connecting pipe is connected to the chassis and protrudes from the chassis; the connecting pipe is provided with a second cavity; the side wall of the connecting pipe is provided with a first opening; the end of the connecting pipe is provided with a second opening; the first opening and the second opening are both connected to the second cavity; the end of the stroke limiting valve stem is provided with a second flange; the second flange can enter the cavity from the first notch and exit from the second cavity, the second flange is larger than the second opening, and the second flange can be movably arranged in the second cavity; the stroke limiting valve stem extends out of the second cavity from the second opening; when the stroke limiting valve stem moves axially, the second flange presses or pulls the pressure block to move the pressure block.

14. The diaphragm valve according to claim 12, characterized in that: The hand wheel is provided with a driving cover assembly, the stroke limiting valve stem passes through the hand wheel and the driving cover assembly, and one end of the stroke limiting valve stem extending out of the driving cover assembly is connected with a nut.

15. The diaphragm valve according to claim 1, characterized in that The color of the travel indicator is different from the colors of the hand wheel and the valve cover.

16. The diaphragm valve according to claim 1 or 15, characterized in that: The color of the travel indicator is red.

Images