Split type diaphragm pressure valve

Abstract

The utility model discloses a split type diaphragm pressure valve, which relates to the technical field of valves, and is characterized in that a base and an upper shell are relatively and fixedly assembled, and the edge of a diaphragm is clamped and fixed; the valve element is assembled on the upper shell in a sliding mode, and the elastic piece exerts elastic force on the valve element so that the valve element can abut against the diaphragm. The valve element comprises a disc part and a plurality of guide convex blocks, the guide convex blocks are fixed to and protrude out of the outer edge of the disc part, the diameter of the edge where the outer edge of each guide convex block is located is larger than that of the disc part, the guide convex blocks can make contact with the side wall of a cavity formed in the upper shell to achieve guiding, and better axial movement limiting is formed for the valve element; a boss is arranged in the upper shell, axial upward limiting is carried out on the valve element, and damage to the valve body during pressure overload is reduced; the blank area between every two adjacent guide protruding blocks and the disc part serves as a vibration buffering area of the diaphragm, the vibration buffering areas are not blocked by solid structures, and therefore the diaphragm can be elastically deformed more greatly, vibration can be absorbed more sufficiently, and pressure fluctuation is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and further relates to a split diaphragm pressure valve. Background Art

[0002] A diaphragm pressure valve is a valve that uses the elastic deformation of the diaphragm to control fluid pressure. It is widely used in various industrial fields, such as chemical industry, petroleum, metallurgy, and medicine, to accurately control fluid parameters such as pressure and flow.

[0003] The operating principle of a diaphragm pressure valve is based on the elastic deformation of the diaphragm and the control of valve opening and closing. When the valve is closed, the diaphragm is pressed against the valve body by the spring, thus achieving a seal. When the valve is open, the valve stem applies downward force through the diaphragm, causing the diaphragm to deform and thus control the flow of fluid.

[0004] The valve core slides axially within the valve body, contacting the diaphragm. Spring force acts on the valve core, transmitting this force to the diaphragm through the core structure, causing the diaphragm to deform. The axial guidance of the spring is constrained by the diaphragm structure. This approach increases the force transmission area between the diaphragm and the valve core, allowing for smoother transmission of spring force to the diaphragm. However, if the power source fluctuates or bubbles enter (or precipitate) the fluid, causing uneven force on the diaphragm-fluid interface, any diaphragm displacement will affect the spring through axial constraint, causing pressure fluctuations and unstable flow.

[0005] The valve core is used as a force transmission medium and also serves as the lower limit of the spring axial guide. This method has a simple structure, but the valve core has no axial guide, and valve core slippage and pressure jump are prone to occur during the adjustment process.

[0006] For those skilled in the art, how to form a better axial movement limit for the valve core and avoid pressure fluctuations is a technical problem that needs to be solved at present. Utility Model Content

[0007] The core of this utility model is to provide a split diaphragm pressure valve, which uses guide bumps to better limit the axial movement of the valve core, reducing the radial displacement of the valve core; providing a shock-absorbing area for diaphragm deformation, fully absorbing vibrations and reducing pressure fluctuations. The specific solution is as follows:

[0008] A split diaphragm pressure valve comprises a base, an upper shell, a diaphragm, a valve core, and an elastic member. The base and the upper shell are relatively fixedly assembled and clamped to fix the edge of the diaphragm.

[0009] The valve core is slidably assembled on the upper housing, and the elastic member is installed in the upper housing and is used to apply elastic force to the valve core so that the valve core presses against the diaphragm;

[0010] The valve core includes a disc portion and guide protrusions, and several guide protrusions are fixed and protrude from the outer edge of the disc portion. The guide protrusions can contact the side wall of the cavity set in the upper shell to achieve guidance; the blank area between two adjacent guide protrusions serves as a shock-absorbing area for the diaphragm.

[0011] Optionally, an inclined chamfer is provided at an edge of the valve core close to the diaphragm, so that an edge of the disc portion and the protrusion form an inclined surface.

[0012] Optionally, a concave receiving groove is provided in the middle position of the valve core near the side of the diaphragm, and an insert block is provided on the side of the diaphragm near the valve core, and the insert block can be nested and inserted in the receiving groove; a spherical raised thickened portion is provided in the center of the side of the diaphragm near the base.

[0013] Optionally, the upper shell is provided with a limiting ring, and the limiting ring is used to limit the extreme position of the valve core retraction.

[0014] Optionally, the guide protrusion is a tapered structure with a larger inner portion and a smaller outer portion.

[0015] Optionally, a positioning groove is provided at a position where the base and / or the upper shell contact each other, a positioning block is provided at an edge of the diaphragm, and the positioning groove and the positioning block are matched with each other and nested and fixed.

[0016] Optionally, the elastic member is a coil spring; a nesting block is provided on a side of the valve core that is used to contact the elastic member, and the nesting block is fitted in conjunction with the coil spring;

[0017] A gasket is provided on the surface of the valve core for contacting the coil spring.

[0018] Optionally, an adjusting bolt is threadedly mounted on the upper shell, and the adjusting bolt can adjust the elastic force of the elastic member; a locking nut is threadedly mounted on the adjusting bolt, and the locking nut is used to lock the position of the adjusting bolt.

[0019] Optionally, a liquid inlet channel and a liquid outlet channel are provided inside the base;

[0020] The inner cavity of the base is provided with a boss, the inner port of the liquid outlet channel is provided on the boss, and the inner port of the liquid inlet channel is provided around the boss; the inner port of the liquid outlet channel faces the center of the diaphragm.

[0021] Optionally, the liquid inlet flow channel includes a liquid inlet horizontal flow section and a liquid inlet vertical flow section, and the liquid outlet flow channel includes a liquid outlet horizontal flow section and a liquid outlet vertical flow section;

[0022] The cross-sectional ratio between the liquid inlet vertical flow section and the liquid outlet vertical flow section is in the range of 1.2 to 1.3.

[0023] The utility model provides a split diaphragm pressure valve, in which a base and an upper shell are relatively fixedly assembled and clamped to fix the edge of the diaphragm; the valve core is slidably assembled on the upper shell, and an elastic member applies elastic force to the valve core so that the valve core presses the diaphragm; the valve core comprises a disc portion and a guide protrusion, a plurality of guide protrusions are fixed and protrude from the outer edge of the disc portion, the edge diameter of the outer edge of the guide protrusion is larger than the diameter of the disc portion, and the guide protrusion can contact with the side wall of the cavity provided in the upper shell to achieve guidance, thereby forming a better axial movement limit for the valve core; the blank area between two adjacent guide protrusions and the disc portion serves as a shock-absorbing area of ​​the diaphragm, and this shock-absorbing area has no physical structure to block it, so that the diaphragm can be elastically deformed to a greater extent, absorb vibration more fully, and reduce pressure fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is an axonometric diagram of the overall structure of the split diaphragm pressure valve provided by the utility model;

[0026] Figure 2 This is a cross-sectional view of the overall structure of the split diaphragm pressure valve provided by the utility model;

[0027] Figure 3 This is an axonometric cross-sectional view of the overall structure of the split diaphragm pressure valve provided by the utility model;

[0028] Figure 4 An axonometric view of the split diaphragm pressure valve provided by the utility model with the upper housing removed;

[0029] Figure 5 An axonometric drawing showing the coordination of the diaphragm, valve core, elastic member, adjusting bolt, and locking nut;

[0030] Figure 6 This is an axonometric view of the valve core from an oblique upward perspective;

[0031] Figure 7 This is an axonometric view of the valve core from an oblique downward perspective.

[0032] The diagram includes:

[0033] Base 1, liquid inlet channel 11, liquid inlet cross-flow section 111, liquid inlet vertical flow section 112, liquid outlet channel 12, liquid outlet cross-flow section 121, liquid outlet vertical flow section 122, boss 13, upper shell 2, positioning groove 21, limiting ring platform 22, diaphragm 3, plug-in block 31, positioning block 32, valve core 4, disc portion 41, guide protrusion 42, accommodating groove 43, nesting block 44, elastic member 5, adjusting bolt 6, plug-in column 61, locking nut 7. DETAILED DESCRIPTION

[0034] The utility model provides a split-type diaphragm pressure valve, which can form a better axial movement limit for the valve core, and provide a cushioning area for the deformation of the diaphragm, fully absorb vibrations, and reduce pressure fluctuations.

[0035] The utility model provides a split diaphragm pressure valve, combined with Figure 1 、 Figure 2 、 Figure 3 As shown, it includes a base 1, an upper shell 2, a diaphragm 3, a valve core 4, an elastic member 5 and other structures. The base 1 and the upper shell 2 are two structures. The base 1 and the upper shell 2 are relatively fixedly assembled to form the outer shell structure of the entire pressure valve. The base 1 and the upper shell 2 can be connected by bolted assembly. The base 1 and the upper shell 2 are relatively fixed to form an internal cavity structure. The edges of the base 1 and the upper shell 2 that are in contact with each other are clamped together to fix the edge of the diaphragm 3. The cavity formed by the base 1 and the upper shell 2 is divided into two parts by the diaphragm 3. The base 1 and the diaphragm 3 form a lower chamber, and the upper shell 2 and the diaphragm 3 form an upper chamber. Water flows through the lower chamber, and there is no water in the upper chamber. The diaphragm 3 can undergo elastic deformation and can elastically expand and contract as the pressure on both sides is different.

[0036] The valve core 4 is slidably assembled on the upper housing 2, and the valve core 4 is Figure 2 、 Figure 3 As shown, the valve core 4 is located in the upper chamber formed by the upper shell 2 and the diaphragm 3. The valve core 4 can translate vertically relative to the upper shell 2. An elastic member 5 is installed in the upper shell 2, between the upper shell 2 and the valve core 4. The elastic member 5 is used to apply an elastic force to the valve core 4. Under the action of the elastic member 5, the valve core 4 tends to move toward the base 1, thereby causing the valve core 4 to press against the diaphragm 3. Under the pressure of the valve core 4, the diaphragm 3 can be elastically deformed. When there is no pressure in the lower chamber formed by the base 1 and the diaphragm 3, the elastic member 5 can squeeze the diaphragm 3, causing the lower surface of the diaphragm 3 to contact the base 1, thereby closing the inner port of the base 1 liquid outlet channel 12. When there is sufficient hydraulic pressure in the liquid inlet channel 11, a thrust can be applied to the diaphragm 3, resisting the elastic force of the elastic member 5, causing the diaphragm 3 to elastically deform upward. The elastic member 5 is compressed, allowing the liquid to flow normally.

[0037] Combine Figure 6 、 Figure 7The figure shows the structure of the valve core 4 of the present invention. The valve core 4 includes a disc portion 41 and guide protrusions 42. The disc portion 41 is a solid structure. The lower surface of the disc portion 41 can contact the diaphragm 3. The portion of the diaphragm 3 that contacts the disc portion 41 can be deformed to a small extent. Several guide protrusions 42 are fixed and protrude from the outer edge of the disc portion 41. Figure 6 、 Figure 7 In the illustrated embodiment, three guide protrusions 42 are provided to form a three-claw structure. To achieve the guiding effect, at least two guide protrusions 42 should be provided, and a greater number of guide protrusions 42 may also be provided. The guide protrusions 42 can contact the sidewalls of the cavity provided in the upper shell 2 to achieve guidance. The inner edge of the guide protrusion 42 is fixed to the disc portion 41, and the shape of the outer edge of the guide protrusion 42 away from the disc portion 41 matches the inner surface of the upper shell 2. For example, the inner surface of the upper shell 2 is a cylindrical surface, and the outer edge of the guide protrusion 42 is a cylindrical surface to ensure contact between the two and provide sliding guidance. The inner surface of the upper shell 2 can be a complete and smooth cylindrical surface, or a groove corresponding to the guide protrusion 42 can be provided, so that the outer edge of the guide protrusion 42 is embedded in the groove. By setting the guide protrusion 42 to form a sliding fit with the inner cavity surface of the upper shell 2, it can guide the translation of the valve core 4, so that the valve core 4 can move in the center; compared with the inner cavity surface of the upper shell 2 that is in contact with the entire circle, a smaller contact area is formed by several guide protrusions 42, which can effectively reduce the resistance caused by excessive contact area.

[0038] Because the guide protrusions 42 protrude radially from the edge of the disc portion 41 and are circumferentially discontinuous, a blank area without a physical structure is formed between two adjacent guide protrusions 42 and the outer edge of the disc portion 41. This blank area serves as a shock-absorbing area for the diaphragm 3. The shock-absorbing area is an arc-shaped area arranged between two adjacent guide protrusions 42. There is no physical structure in the shock-absorbing area, so the diaphragm 3 is not blocked in the shock-absorbing area, which can form a larger deformation amplitude in the shock-absorbing area of ​​the diaphragm 3. When the water pressure in the lower chamber changes, the shock-absorbing area of ​​the diaphragm 3 is first elastically deformed, reducing the frequent compression changes caused by water pressure fluctuations on the elastic member 5. The shock-absorbing area formed by the guide protrusions 42 can better absorb vibrations and reduce pressure fluctuations.

[0039] On the basis of the above scheme, combined with Figure 2 、 Figure 3As shown, the edge of the valve core 4 near the diaphragm 3 is provided with an inclined chamfer, so that the edge of the disc portion 41 and the protrusion 42 form an inclined surface. The lower surface of the disc portion 41 is mainly flat, forming a close match with the diaphragm 3. The chamfer can avoid sharp transitions at the edge of the valve core 4, thereby preventing the cushioning area of ​​the diaphragm 3 from being cut by the edge of the valve core 4 when it deforms, thereby reducing the local stress on the diaphragm 3 and improving the service life of the diaphragm 3.

[0040] Combine Figure 7 As shown, a concave receiving groove 43 is provided in the middle position of the valve core 4 close to the diaphragm 3, and the receiving groove 43 is provided on the disc portion 41; an insert block 31 is provided on the side of the diaphragm 3 close to the valve core 4, and the insert block 31 protrudes from the upper surface of the diaphragm 3. The insert block 31 can be nested and inserted in the receiving groove 43, and the insert block 31 and the receiving groove 43 form an interference fit, so that the valve core 4 is close to the diaphragm 3 to form a tighter integrated fitting relationship, and the central area of ​​the diaphragm 3 and the valve core 4 keep synchronous up and down translation.

[0041] Combine Figure 2 As shown, a spherical raised thickened portion is provided at the center of the diaphragm 3 near the base 1, and the diaphragm 3 as a whole forms a structure distribution with a thick middle and thin edges. The thickened portion on the bottom surface of the diaphragm 3 is a spherical curved surface, which can form a tighter sealing fit between the middle area of ​​the diaphragm 3 and the inner end of the liquid outlet channel 12 of the base 1.

[0042] Combine Figure 2 、 Figure 3 As shown, a limit ring 22 is provided in the inner cavity of the upper shell 2. The limit ring 22 is used to limit the extreme position of the retraction of the valve core 4. The limit ring 22 can contact with the protrusion 42 to achieve axial limitation, and limit the axial upward movement of the entire valve core 4 to reduce damage to the valve body when the pressure is overloaded.

[0043] Combine Figure 5 、 Figure 6 、 Figure 7 As shown, the guide protrusion 42 is a tapered structure with a larger inner portion and a smaller outer portion. The width of the inner edge where the guide protrusion 42 is fixed to the disc portion 41 is larger, and the width of the outer edge of the guide protrusion 42 away from the disc portion 41 is smaller. The width of the guide protrusion 42 gradually decreases from the inner edge to the outer edge, forming a frustum-shaped tapered structure, which ensures the connection strength between the guide protrusion 42 and the disc portion 41, while reducing the contact area between the outer edge and the inner cavity surface of the upper shell 2.

[0044] Positioning grooves are provided at the locations where the base 1 and / or the upper shell 2 contact each other, and positioning blocks are provided at the edges of the diaphragm 3. The positioning grooves and positioning blocks are matched and nested with each other. Figure 2 、 Figure 3As shown, a positioning groove 21 is provided on the upper shell 2 at the position where the base 1 and the upper shell 2 contact each other. The positioning groove 21 is an annular groove. An annular positioning block 32 is provided on the edge of the diaphragm 3. The positioning block 32 can be embedded in the positioning groove 21, which has a better positioning and fixing effect on the diaphragm 3.

[0045] Combine Figure 3 、 Figure 4 、 Figure 5 As shown, in some embodiments, the elastic member 5 is a coil spring, and other elastic structures such as a spring can also be used instead. A nesting block 44 is provided on the side of the valve core 4 that contacts the elastic member 5. The nesting block 44 is a cylindrical structure and is inserted into the coil spring.

[0046] The upper surface of the valve core 4 is provided with a gasket 51 for contacting the coil spring. The gasket 51 directly contacts the spring, which can prevent the spring from directly contacting the upper surface of the valve core 4 and thus avoid direct wear on the valve core 4.

[0047] Combine Figure 2 、 Figure 3 As shown, an adjusting bolt 6 is threadedly mounted on the upper shell 2, and the depth of insertion into the upper shell 2 can be adjusted when the adjusting bolt 6 is rotated. A plug-in column 61 is provided at the bottom of the adjusting bolt 6, and the upper end of the spring is sleeved on the plug-in column 61. The adjusting bolt 6 can adjust the elastic force of the elastic member 5. The longer the adjusting bolt 6 extends downward into the upper shell 2, the greater the pressure exerted on the spring. A locking nut 7 is threadedly mounted on the adjusting bolt 6, and the locking nut 7 is used to lock the position of the adjusting bolt 6. When the adjusting bolt 6 has completed adjusting the elastic force of the spring, the locking nut 7 is tightened and fixed in the position of the adjusting bolt 6. Before the adjusting bolt 6 moves, the locking nut 7 needs to be loosened first. The locking nut 7 is provided with an internal thread, which engages with the external thread of the adjusting bolt 6. When the locking nut 7 is screwed onto the upper shell 2, it can form a fixed fit with the adjusting bolt 6.

[0048] Based on any of the above technical solutions and their combination, Figure 2 、 Figure 3 As shown, the base 1 is internally provided with an inlet channel 11 and an outlet channel 12. External water enters the lower chamber through the inlet channel 11 and is discharged through the outlet channel 12. Only when the water pressure entering the inlet channel 11 reaches a certain value can the diaphragm 3 be pushed upward to resist the elastic force of the elastic member 5. By adjusting the preload force on the elastic member 5 by adjusting the screw 6, the opening water pressure can be changed. Before the water pressure reaches the opening pressure, the inlet channel 11 and the outlet channel 12 are blocked by the diaphragm 3.

[0049] The inner cavity of the base 1 is provided with a boss 13, the upper end surface of which is higher than the rest of the bottom surface of the base 1. The inner end of the liquid outlet channel 12 is provided on the boss 13, and the inner end of the liquid inlet channel 11 is provided around the boss 13, with the inner end of the liquid inlet channel 11 being lower than the inner end of the liquid outlet channel 12. The inner end of the liquid outlet channel 12 faces the center of the diaphragm 3. When the valve core 4 pushes the center of the diaphragm 3 downward, the liquid outlet channel 12 is blocked.

[0050] During operation, tightening the adjusting screw 6 compresses the elastic member 5. The spring force F1 is transmitted downward through the valve core 4 to the diaphragm 3. Fluid enters through the inlet channel 11 and flows into the lower chamber. Fluid pressure F2 acts on the diaphragm 3, exerting an upward force. As the fluid continues to flow in, the forces on the diaphragm 3 balance, achieving a balance between F1 and F2. The diaphragm 3 is then lifted upward, and the outlet channel 12 connects to the lower chamber, allowing excess fluid to flow out.

[0051] The specific configuration of the liquid inlet channel 11 and the liquid outlet channel 12 is as follows:

[0052] The liquid inlet channel 11 includes a liquid inlet cross-flow section 111 and a liquid inlet vertical flow section 112, while the liquid outlet channel 12 includes a liquid outlet cross-flow section 121 and a liquid outlet vertical flow section 122. The liquid inlet cross-flow section 111 and the liquid outlet cross-flow section 121 are arranged in parallel, while the liquid inlet vertical flow section 112 and the liquid outlet vertical flow section 122 are parallel to each other and parallel to the movement direction of the valve core 4. Liquid undergoes a 90-degree change in direction from the liquid inlet cross-flow section 111 to the liquid inlet vertical flow section 112, and the liquid undergoes a 90-degree change in direction from the liquid outlet cross-flow section 121 to the liquid outlet vertical flow section 122.

[0053] The cross-sectional ratio between the inlet and outlet sections 112 and 122 ranges from 1.2 to 1.3, for example, 1.25. This dimensional relationship improves the force distribution on the diaphragm 3 and enhances valve performance. Simulation experiments show that pressurized fluid flows irregularly when the flow path changes diameter or turns. The greater the diameter change, the more chaotic the flow. Controlling the valve body's inlet and outlet ratio within the range of 1.2-1.3 improves the force distribution on the valve diaphragm under existing technical conditions and enhances valve performance.

[0054] The valve core 4 of this split-type diaphragm pressure valve utilizes a guide protrusion 42 as a guide structure, which cooperates with the upper housing 2 to achieve axial positioning of the valve core 4, thereby reducing radial displacement of the valve core. The outer periphery of the bottom portion of the valve core 4, which contacts the diaphragm, is removed at a proportional angle to provide a diaphragm cushioning area, mitigating pressure fluctuations caused by the power source or cavitation. Adjusting the cross-sectional ratio of the inlet and outlet vertical flow sections 112 and 122 within the valve body regulates the inlet fluid flow pattern, reduces the impact of the fluid on the diaphragm at the cavity entrance, and extends the diaphragm's fatigue life.

[0055] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A split diaphragm pressure valve, characterized in that: It comprises a base (1), an upper shell (2), a diaphragm (3), a valve core (4), and an elastic member (5), wherein the base (1) and the upper shell (2) are relatively fixedly assembled and clamped to fix the edge of the diaphragm (3); The valve core (4) is slidably assembled on the upper shell (2), and the elastic member (5) is installed in the upper shell (2) and is used to apply elastic force to the valve core (4) so ​​that the valve core (4) presses against the diaphragm (3); The valve core (4) comprises a disc portion (41) and guide protrusions (42), wherein a plurality of the guide protrusions (42) are fixed and protrude from the outer edge of the disc portion (41), and the guide protrusions (42) can contact the side wall of the cavity provided in the upper shell (2) to achieve guidance; the blank area between two adjacent guide protrusions (42) serves as a shock-absorbing area for the diaphragm (3).

2. The split diaphragm pressure valve according to claim 1, characterized in that: An inclined chamfer is provided at the edge of the valve core (4) close to the diaphragm (3), so that an edge of the disc portion (41) and the protrusion (42) form an inclined surface.

3. The split diaphragm pressure valve according to claim 1, characterized in that: A concave receiving groove (43) is provided in the middle of the valve core (4) on one side close to the diaphragm (3), and a plug-in block (31) is provided on the side of the diaphragm (3) close to the valve core (4), and the plug-in block (31) can be nested and inserted in cooperation with the receiving groove (43); And / or, a spherical raised thickened portion is provided at the center of one side of the diaphragm (3) close to the base (1).

4. The split diaphragm pressure valve according to claim 1, characterized in that: The upper housing (2) is provided with a limiting ring platform (22), and the limiting ring platform (22) is used to limit the extreme position of the retraction of the valve core (4).

5. The split diaphragm pressure valve according to claim 1, characterized in that: The guide protrusion (42) is a tapered structure with a larger inner portion and a smaller outer portion.

6. The split diaphragm pressure valve according to claim 1, characterized in that: Positioning grooves are provided at positions where the base (1) and / or the upper shell (2) contact each other, and positioning blocks are provided at the edges of the diaphragm (3), wherein the positioning grooves and the positioning blocks are matched and nested with each other for fixation.

7. The split diaphragm pressure valve according to claim 1, characterized in that: The elastic member (5) is a coil spring; a nesting block (44) is provided on one side of the valve core (4) for contacting the elastic member (5); the nesting block (44) is fitted in conjunction with the coil spring; A gasket (51) is provided on the surface of the valve core (4) for contacting the coil spring.

8. The split diaphragm pressure valve according to claim 7, characterized in that: An adjusting bolt (6) is threadedly mounted on the upper shell (2), and the adjusting bolt (6) is capable of adjusting the elastic force of the elastic member (5); a locking nut (7) is threadedly mounted on the adjusting bolt (6), and the locking nut (7) is used to lock the position of the adjusting bolt (6).

9. The split diaphragm pressure valve according to any one of claims 1 to 8, characterized in that: A liquid inlet channel (11) and a liquid outlet channel (12) are provided inside the base (1); A boss (13) is provided in the inner cavity of the base (1), an inner port of the liquid outlet channel (12) is provided on the boss (13), and an inner port of the liquid inlet channel (11) is provided around the boss (13); the inner port of the liquid outlet channel (12) faces the center of the diaphragm (3).

10. The split diaphragm pressure valve according to claim 9, characterized in that: The liquid inlet flow channel (11) comprises a liquid inlet transverse flow section (111) and a liquid inlet vertical flow section (112); the liquid outlet flow channel (12) comprises a liquid outlet transverse flow section (121) and a liquid outlet vertical flow section (122); The cross-sectional ratio between the liquid inlet vertical flow section (112) and the liquid outlet vertical flow section (122) is in the range of 1.2 to 1.3.

Images