CN114962699A

CN114962699A - Diaphragm valve gap, through diaphragm valve and fluid control system

Info

Publication number: CN114962699A
Application number: CN202111175123.5A
Authority: CN
Inventors: 崔书生; 张立勇
Original assignee: Ningjin Apc Industries Co ltd
Current assignee: Ningjin Apc Industries Co ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2022-08-30

Abstract

The invention discloses a valve cover of a diaphragm valve, which can guide the movement of a diaphragm in the opening or resetting (closing) process of the diaphragm by arranging a guide bulge on a valve cover body, so that the diaphragm is prevented from being overturned and displaced. Meanwhile, the straight-through diaphragm valve comprising the diaphragm valve cover is different from the existing diaphragm valve structure in the market, and has the advantages of simple and reasonable structure, easiness in processing, low manufacturing cost and convenience in maintenance; the straight-through valve body structure has low flow loss, and the service life of the diaphragm valve can be prolonged; the guide bulge on the valve cover is used for guiding the diaphragm during opening and closing, so that the diaphragm is prevented from being overturned and displaced, and the stability and the sealing performance of the diaphragm are further improved. The straight-through diaphragm valve can be used as a main valve structure and is suitable for automatic water-spraying fire-extinguishing systems, fluid control systems and the like with higher pressure. In addition, the invention also provides a fluid control system comprising the through diaphragm valve, which has the advantages of the through diaphragm valve.

Description

Diaphragm valve gap, through diaphragm valve and fluid control system

Technical Field

The invention belongs to the technical field of valves, and relates to a main valve structure, in particular to a diaphragm valve cover, a straight-through diaphragm valve and a fluid control system.

Background

At present, a main valve of a fluid control system on the market is limited by a design principle, and has the main defects of low pressure bearing, large flow loss, high manufacturing cost of individual accessories, high difficulty and the like; part of the valve is also limited by the installation direction. Taking a deluge valve as an example, the deluge valves on the market at present are mainly two types:

the diaphragm type diaphragm has the advantages that the diaphragm plays a role in bearing and sealing, and has the defects of large flow loss, high diaphragm manufacturing cost, large difficulty and limited use pressure; moreover, the opening and closing of the diaphragm are controlled by fluid, and the diaphragm is easy to turn over and shift in the opening process or the closing process, so that the pressure bearing and the sealing effect of the diaphragm are influenced.

The lever type (II) has the defects of only vertical installation, more accessories and high processing cost.

Disclosure of Invention

One of the objectives of the present invention is to provide a valve cover with diaphragm guiding function, which is mainly used for a diaphragm valve, so as to overcome the problem that the diaphragm is easy to be overturned and displaced during the opening process or the closing process in the prior art. In order to achieve the purpose, the invention provides the following scheme:

a diaphragm valve bonnet comprising:

the valve cover body is used for being connected with the valve body;

the valve cover body is provided with a valve body, and the valve body is provided with a valve cover body, a valve body and a diaphragm, wherein the valve cover body is used for being buckled with the valve body.

Optionally, the guide protrusion is a conical protrusion, and a large head end of the conical protrusion is connected with the valve cover body.

Another object of the present invention is to provide a straight-through diaphragm valve, which is not easy to turn over and shift during the opening or closing process, and has the advantages of low flow loss, easy processing, high reliability, etc. In order to achieve the purpose, the invention provides the following scheme:

a through-diaphragm valve comprising:

the valve comprises a straight-through valve body, a first valve body and a second valve body, wherein the straight-through valve body is provided with a through hole for being connected with a first external pipeline;

the valve cover is connected with the through valve body, and a through hole used for being connected with a second external pipeline is formed in the valve cover;

the diaphragm is arranged in the straight-through valve body and is fixed between the valve cover and the straight-through valve body; a control cavity is formed between the diaphragm and the valve cover, and a fluid cavity is formed between the diaphragm and the through valve body;

the guide bulge is arranged on the end face, used for being buckled with the through valve body, of the valve cover and used for guiding the diaphragm to be opened and closed.

Optionally, the diaphragm comprises:

the sealing section is used for plugging the fluid cavity and is internally coated with a diaphragm framework, and the diaphragm framework can enable the sealing section to keep a fixed shape;

and the connecting section is connected to one end of the sealing section and is used for being fixed between the valve cover and the through valve body.

Optionally, the diaphragm framework is a conical framework, that is, the whole diaphragm framework is frustum-shaped, so that the sealing section is a conical sealing section; the connecting section is connected to the big end of the conical sealing section.

Optionally, the guide protrusion is a tapered protrusion, and a large end of the tapered protrusion is connected with the valve cover.

Optionally, the taper of the tapered protrusion is the same as the taper of the tapered framework.

Optionally, the connecting section is formed by extending the diaphragm of the sealing section.

Optionally, the diaphragm of the sealing section completely wraps the diaphragm skeleton, and extends to form the connecting section.

Optionally, the diaphragm, i.e. the sealing section and the connecting section, is integrally tapered.

Optionally, a conical sealing surface of the valve body is arranged in the fluid cavity, so as to be in sealing fit with the outer peripheral surface of the conical sealing section when the diaphragm is reset and closed. The closed state of the diaphragm valve is used as the original state, and the process of switching the diaphragm from the opening state to the closing state is the process of resetting (or resetting and closing) the diaphragm.

Optionally, a conical concave surface is arranged in the fluid cavity, so as to be embedded with the bottom of the conical sealing section when the diaphragm is reset and closed, and form a sealing pair. The closed state of the diaphragm valve is used as an original state, and the process of switching the diaphragm from the open state to the closed state is a diaphragm resetting (or resetting and closing) process.

Optionally, the guide protrusion is provided with a hollow hole for communicating with the second external pipeline.

Optionally, the guide protrusion is located at the center of the valve cover, and the valve cover is provided with a through hole for connecting with the second external pipeline at least on the cover surface covered by the guide protrusion. The through hole arranged on the end face of the valve cover covered by the guide protrusion is communicated with the control cavity through the hollow hole.

Optionally, the guide protrusion and the valve cover are integrally formed.

Optionally, the valve cover, the diaphragm and the through valve body are detachably connected through bolts.

Optionally, a through hole for connecting the second external pipeline on the valve cover and/or a through hole for connecting the first external pipeline on the through valve body is provided as a threaded hole.

Optionally, the first external pipe and the second external pipe are connected to the same fluid pipe, or different fluid pipes. The first external pipeline and the second external pipeline are both unspecified pipelines, and have different application scenes and different pipelines.

Optionally, the diaphragm is a rubber diaphragm, such as EPDM (ethylene propylene diene monomer), NBR (nitrile butadiene rubber).

Optionally, the diaphragm skeleton is a nodular cast iron skeleton or a stainless steel skeleton.

Optionally, two ends of the through valve body are respectively provided with a connecting flange to realize connection between the through diaphragm valve and a pipeline.

The invention also provides a fluid control system, which comprises the straight-through diaphragm valve, wherein the control cavity is connected with the second external pipeline to form a valve cover end fluid channel, and the fluid cavity is connected with the first external pipeline to form a valve body end fluid channel; by regulating and controlling the pressure of fluid in the valve cover end fluid channel and the valve body end fluid channel, the diaphragm can move towards the direction close to the valve cover along the guide protrusion and open the fluid cavity, or the diaphragm can reset towards the direction far away from the valve cover along the guide protrusion and seal the fluid cavity. The closed state of the diaphragm valve is used as the original state, so that the process of switching the diaphragm from the opening state to the closing state is the process of resetting (or resetting and closing) the diaphragm.

Compared with the prior art, the invention has the following technical effects:

according to the valve cover of the diaphragm valve, the guide bulge is arranged on the valve cover body, so that the movement of the diaphragm can be guided in the opening process or the closing process of the diaphragm, and the diaphragm is prevented from overturning and shifting.

The straight-through diaphragm valve provided by the invention is different from the existing diaphragm valve structure in the market, and has the advantages of simple and reasonable structure, easiness in processing, low manufacturing cost and convenience in maintenance; the straight-through valve body structure has low flow loss, and the service life of the diaphragm valve can be prolonged; the guide bulge on the valve cover is used for guiding the diaphragm during opening and closing, so that the diaphragm is prevented from being overturned and displaced, and the stability and the sealing performance of the diaphragm are further improved. The straight-through diaphragm valve can be used as a main valve structure and is suitable for automatic water-spraying fire-extinguishing systems, fluid control systems and the like with higher pressure.

The fluid control system provided by the invention has the corresponding technical advantages of the straight-through diaphragm valve due to the adoption of the straight-through diaphragm valve; the fluid control system may be an automatic sprinkler system, a drainage system, or the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a straight-through diaphragm valve in a closed state according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a straight-through diaphragm valve disclosed in the embodiment of the present invention in an open state;

FIG. 3 is a schematic structural diagram of a straight-through valve body disclosed in the embodiment of the invention;

FIG. 4 is a top view of the through valve body disclosed in an embodiment of the present invention;

FIG. 5 is a 90 degree cross-sectional view of a through valve body disclosed in an embodiment of the present invention;

FIG. 6 is a bottom view of the through valve body disclosed in the embodiments of the present invention;

FIG. 7 is a longitudinal cross-sectional view of a through valve body disclosed in an embodiment of the present invention;

FIG. 8 is a first isometric view of a valve cover according to the disclosed embodiment of the present invention;

FIG. 9 is a second isometric view of a valve cover according to the disclosed embodiment of the present invention;

FIG. 10 is a top view of a valve cover according to an embodiment of the present invention;

FIG. 11 is a longitudinal cross-sectional view of a valve cover according to an embodiment of the present invention;

figure 12 is a first isometric view of a disclosed septum according to an embodiment of the invention;

FIG. 13 is a second isometric view of a disclosed septum according to an embodiment of the invention;

FIG. 14 is a schematic view of a piping installation of a through diaphragm valve for a sprinkler system according to an embodiment of the present invention;

fig. 15 is a schematic view of a piping installation of the straight-through diaphragm valve for a pressure reducing system according to an embodiment of the present invention.

Wherein the reference numerals are:

100. a straight-through diaphragm valve;

1. is directly communicated with the valve body; 11. a conical sealing surface of the valve body; 12. a conical concave surface;

2. a valve cover; 21. a bonnet body; 22. a guide projection; 221. a conical surface of the valve cover; 222. hollowing out holes;

3. a through hole;

4. a diaphragm; 41. a sealing section; 411. a diaphragm conical sealing surface; 42. a diaphragm skeleton; 43. a connecting section;

5. a control cavity;

6. a fluid chamber; 61. an upper chamber; 62. a lower cavity;

7. a bolt;

8. a connecting flange;

9. a drain hole;

200. a drainage loop; 300. an alarm loop; 400. an alarm test loop; 500. a release circuit; 600. a water injection loop; 700. an automatic drainage circuit; 800. a pilot valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

One of the objectives of the present invention is to provide a valve cover with diaphragm guiding function, which is mainly used for a diaphragm valve, so as to overcome the problem that the diaphragm is easy to be overturned and displaced during the opening process or the closing process in the prior art.

The invention also aims to provide the straight-through diaphragm valve which is not easy to turn and shift in the opening or resetting closing process and has the advantages of low flow loss, easiness in processing, high reliability and the like so as to solve the problems of large flow loss and high manufacturing cost of the existing valve.

It is a further object of the present invention to provide a fluid control system including the through diaphragm valve described above.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The first embodiment is as follows:

as shown in fig. 8 to 11, the present embodiment provides a valve cap 2 for a diaphragm valve, which mainly includes a valve cap body 21 and a guide protrusion 22, wherein the valve cap body 21 is used for being connected to a valve body, and the guide protrusion 22 is disposed on an end surface of the valve cap body 21, which is used for being fastened to the valve body, so as to guide the opening and closing of a diaphragm in the valve body.

Preferably, the guide protrusion 22 is a conical protrusion, and the big end of the conical protrusion is connected to the valve cover body 21. Generally, the diaphragm moves towards the direction close to the valve cover body 21 to open the valve, otherwise, the valve is closed, the small end of the guide protrusion 22 is far away from the valve cover body 21, and the diaphragm can smoothly slip off from the guide protrusion 22 while moving along the guide protrusion 22 when the valve is closed. Correspondingly, when the valve is opened, the diaphragm moves from the small end to the large end of the guide bulge 22, the guidance performance is good, and the diaphragm can be effectively prevented from turning and shifting in the opening process.

Example two:

as shown in fig. 1 to 13, the present embodiment provides a through diaphragm valve 100, which is not easy to turn over and shift during the opening or resetting process, and has the advantages of low flow loss, easy processing, high reliability, and the like, and mainly includes a through valve body 1, a bonnet 2, a diaphragm 4, and a guide protrusion 22. Wherein, the through valve body 1 is provided with a through hole 3 for connecting with a first external pipeline; the valve cover 2 is connected with the through valve body 1, and a through hole 3 used for being connected with a second external pipeline is formed in the valve cover 2; the diaphragm 4 is arranged in the through valve body 1 and fixed between the valve cover 2 and the through valve body 1, a control cavity 5 is formed between the diaphragm 4 and the valve cover 2, and a fluid cavity 6 is formed between the diaphragm 4 and the valve body; the guide projection 22 is arranged on the end face of the valve cap 2 for being buckled with the through valve body 1 to guide the opening and closing of the diaphragm 4.

In this embodiment, as shown in fig. 1, 2, 12, and 13, the diaphragm 4 includes a sealing section 41 and a connecting section 43, the sealing section 41 is used for blocking the fluid cavity 6, and a diaphragm skeleton 42 is wrapped in the sealing section 41, and the diaphragm skeleton 42 can keep the sealing section 41 in a fixed shape; the connecting section 43 is connected to one end of the sealing section 41 for fixing between the bonnet 2 and the straight-through valve body 1.

In this embodiment, as shown in fig. 1, 2, 12, and 13, the diaphragm framework 42 is preferably a tapered framework, that is, the diaphragm framework 42 is entirely frustum-shaped, so that the sealing section 41 is a tapered sealing section; the connecting section 43 is connected to the large end of the tapered sealing section and is formed by the diaphragm 4 of the sealing section 41 extending directly. The membrane of the sealing section 41 completely wraps the membrane skeleton 42, so that the sealing section 41 has a double-layer membrane structure. The connecting section 43 can be stacked on the guide projection 22 when the sealing section 41 is restored along the guide projection 22 (i.e., when the valve is opened); when the sealing section 41 is completely sleeved outside the guide protrusion 22 and the sealing section 41 cannot move further along the guide protrusion 22 (when the valve is in a fully opened state), the connecting section 43 can completely abut against the corner formed between the guide protrusion 22 and the valve cover 2, and the diaphragm of the connecting section 43 is kept or substantially kept flat, as shown in fig. 2. Among them, the diaphragm 4 is preferably a diaphragm made of rubber, such as EPDM (ethylene propylene diene monomer), NBR (nitrile butadiene rubber), or the like; diaphragm armature 42 is preferably made of ductile iron or stainless steel.

In the present embodiment, as shown in fig. 1, 2, 8 and 11, the guide protrusion 22 is designed as a tapered protrusion whose large end is connected to the valve cover 2 in consideration of the shape fitting with the seal section 41. Preferably, the taper of the tapered protrusion (i.e., guide protrusion 22) is the same as the taper of the tapered backbone (i.e., septum backbone 42).

In this embodiment, as shown in fig. 1 to 7, a valve body conical sealing surface 11 is disposed in the fluid cavity 6 that leads to the valve body 1, so as to form a sealing pair by sealing and attaching to the outer peripheral surface of the conical sealing section of the diaphragm 4, i.e., the diaphragm conical sealing surface 411, in a closed (reset) state. In this embodiment, the good self-sealing property of the cone structure is used to realize the opening and closing of the valve, and the sealing performance of the valve when closed can be effectively ensured.

In this embodiment, as shown in fig. 1 and 2, a tapered concave surface 12 is provided in the fluid cavity 6 of the straight-through valve body 1 to be embedded with the bottom of the tapered sealing section in the closed (reset) state of the diaphragm 4 and form a sealing pair, so that the bottom of the diaphragm 4 can be prevented from shaking, and the supporting function of the diaphragm framework 42 in the diaphragm 4 is matched, which is beneficial to improving the sealing effect of the diaphragm 4, thereby prolonging the service life of the diaphragm and the valve as a whole.

In this embodiment, as shown in fig. 8 and 11, the guide protrusion 22 is provided with a hollow hole 222 for communicating with the second external pipe. Preferably, the present embodiment has the guide protrusion 22 provided at the center of the valve cap 2, and the valve cap 2 is provided with the through-hole 3 for connection with the second external pipe at least on the cap surface thereof covered by the guide protrusion 22. The through hole 3 provided on the end surface of the valve cover 2 covered by the guide protrusion 22 communicates with the control chamber 5 through the hollow hole 222.

In this embodiment, the guide protrusion 22 and the valve cover 2 may be integrally provided, or may be separately provided and then assembled. Preferably, the guide protrusion 22 of the present embodiment is integrally formed with the bonnet 2.

In the present embodiment, as shown in fig. 1 and 2, the bonnet 2, the diaphragm 4 and the through valve body 1 are preferably detachably connected by bolts 7.

In this embodiment, through-hole 3 on the valve gap 2 and through-hole 3 on the valve body 1 all preferably set up to the screw hole, can be directly with outside pipeline threaded connection, it is convenient to install.

In this embodiment, as shown in fig. 1, two ends of the straight-through valve body 1 are respectively provided with a connecting flange 8, so as to implement the installation and connection of the straight-through diaphragm valve 100 on a corresponding pipeline.

In this embodiment, a first external pipe connected to the through hole 3 of the straight-through valve body 1 and a second external pipe connected to the through hole 3 of the bonnet 2 are connected to the same fluid pipe or different fluid pipes. The first external pipeline and the second external pipeline are not specific, application scenes are different, and pipelines are different.

In this embodiment, the operation principle of the through diaphragm valve 100 is as follows: when liquid enters from the through hole 3 on the valve cap 2, the diaphragm 4 is pushed to move towards the direction far away from the valve cap 2 under the action of pressure, so that the conical sealing surface 411 of the diaphragm is contacted with the conical sealing surface 11 of the valve body to achieve the sealing effect, as shown in fig. 1. At this time, the diaphragm 4 is tightly attached to the straight-through valve body 1, and the bottom end of the diaphragm 4 is completely embedded into the conical concave surface 12, so that the diaphragm 4 can be protected from being damaged under high pressure. The cavity formed between the valve cover 2 and the diaphragm 4 is a control cavity 5, the cavity formed between the diaphragm 4 and the through valve body 1 is a fluid cavity 6, the cavity at the water inlet end of the valve body is a lower cavity 62, the cavity at the water outlet end of the valve body is an upper cavity 61, the upper cavity 61 and the lower cavity 62 also belong to the fluid cavity 6, and the fluid cavity located between the upper cavity 61 and the lower cavity 62 is used for being matched with the diaphragm 4, so that the communication (valve opening) and the cut-off (valve closing) between the upper cavity 61 and the lower cavity 62 are realized through the movement of the diaphragm 4. When the pressure in the control chamber 5 drops to a certain value, the fluid under pressure in the lower chamber 62 pushes the diaphragm 4 to move and open the valve, so that even if the upper chamber 61 and the lower chamber 62 are communicated with each other, the diaphragm 4 will not tilt due to the guiding effect when moving along the tapered surface 221 of the valve cover, as shown in fig. 2.

The embodiment further provides a fluid control system, which includes the through diaphragm valve 100 as described above, wherein the control cavity 5 is connected to a second external pipeline to form a bonnet-end fluid channel, the fluid cavity 6 is connected to a first external pipeline to form a valve-body-end fluid channel, and by regulating and controlling the pressures of the fluids in the bonnet-end fluid channel and the valve-body-end fluid channel, the diaphragm 4 can be moved along the guide protrusion 22 in a direction close to the bonnet 2 and the fluid cavity 6 is opened, or the diaphragm 4 can be reset along the guide protrusion 22 in a direction away from the bonnet 2 and separated from the guide protrusion 22, so as to close the fluid cavity 6. The first external pipeline and the second external pipeline are not specific pipelines, application scenes are different, and pipelines are different. The working principle of the fluid control system of the present embodiment is specifically described below by taking the rain alarm system as an example:

as shown in fig. 14, the rain alarm system includes a through diaphragm valve 100, a drain circuit 200, an alarm circuit 300, an alarm test circuit 400, a release circuit 500, a water filling circuit 600, and an automatic drain circuit 700, wherein the through diaphragm valve 100 functions as a rain alarm valve. The drain circuit 200 is used to drain water in the valve body and in the pipeline behind the valve out of the valve after the rain alarm valve is reset once, and to close the drain ball valve after the drainage is completed (the drain ball valve is normally closed and is opened only when the water is drained). When the deluge alarm valve is actuated, water enters the alarm bell and the pressure switch or other alarm devices through the alarm circuit 300. When the deluge alarm valve is in a servo state, the alarm test circuit 400 is used for periodically testing the reliability of the alarm system, a ball valve on the circuit is opened during testing (the ball valve is opened only during testing), water enters the alarm system from the water supply side of the valve plate, and the test ball valve is closed in time after testing is completed. The release circuit 500 is connected with the control cavity 5 and used for releasing the pressure therein, and can be provided with an automatic release part and a manual emergency release part, and the automatic release part can be externally connected with an electromagnetic valve, a pneumatic valve and the like. The water fill circuit 600 is used to fill the control chamber 5 to complete the valve reset (i.e., diaphragm return to closed state), and must be connected to the water supply side of the pre-valve water supply control valve. The automatic drain circuit 700 is used for valve reset drain. The rain alarm system mainly comprises the following two working modes:

starting: when a fire disaster happens, fire signals are transmitted to the control module, the control module sends starting signals to the solenoid valve or other control valves on the deluge alarm valve release loop 500 after signal processing, the solenoid valve or other control valves are opened, the pressure of the control cavity body 5 is relieved, so that the deluge alarm valve is opened, water enters a system pipe network from a water supply side, and is sprayed to the whole protection area through the spray head to perform a fire extinguishing function. When the electromagnetic valve or other control valves are not normally opened after receiving signals, a worker opens the manual emergency release valve to release the pressure of the diaphragm cavity.

(II) resetting: after the fire is extinguished, the electromagnetic valve or other control valves on the release loop 500 are closed, the manual emergency release valve is closed, the water supply control valve before the valve is closed, then a worker presses the manual reset valve on the water injection loop 600 to rapidly inject water into the control cavity 5, the deluge alarm valve is reset, when the water pressure of the control cavity 5 is consistent with that of the water supply side, the control cavity 5 is loosened, the one-way valve in the manual reset valve is automatically opened, and the pressure of the control cavity 5 and the pressure of the water supply side are always kept consistent. And finally, the water supply control valve is opened to finish resetting.

The rain alarm system can release the pressure of the control cavity 5 in an electric, pneumatic or manual mode, the valve is automatically opened under the action of the pressure of the pipeline of the water supply system, and water automatically flows into the water spraying system and gives an alarm. The straight-through diaphragm valve 100 of the embodiment can be vertically installed or horizontally installed, can also form a plurality of rain alarm fire-extinguishing systems with other components, and is suitable for automatic water spray fire-extinguishing systems in residences, hospitals, hotels, shopping malls, factories, airports, casinos, libraries, stadiums, convention and exhibition centers and the like. In general, the temperature of the environment is not lower than 4 ℃ and not higher than 70 ℃.

Example three:

as shown in fig. 15, the present embodiment provides another fluid control system, specifically a water supply system, which includes a pilot valve 800 and the through diaphragm valve 100 described in the second embodiment, wherein the pilot valve 800 is connected to the through diaphragm valve 100 according to the path shown in fig. 15. In the water supply system, the straight-through diaphragm valve 100 is used as a pressure reducing valve, the pilot valve 800 is used for manual adjustment, the outlet pressure is manually set within the working pressure range, and the higher pre-valve pressure can be automatically reduced to the set outlet pressure value after the setting. No matter how the pressure or the flow before the valve changes, the pressure after the valve can be maintained relatively stable, and the valve is suitable for water supply systems of residences, hospitals, hotels, markets, factories, airports, casinos, libraries, stadiums, exhibition centers and the like. In general, the temperature of the environment is not lower than 4 ℃ and not higher than 70 ℃.

The working principle of the water supply system is as follows:

firstly, when pressure exists in front of the valve, the straight-through diaphragm valve 100 is opened, the same pressure acts on the control cavity 5 through a pipeline, and the pressure of the control cavity 5 is controlled by adjusting the pilot valve 800, so that the change of the outlet pressure of the straight-through diaphragm valve 100 is realized.

Second, when there is no flow demand on the system (the post-valve pressure is a set value), the pilot valve 800 is closed. The pressure coming from the lower chamber 62 of the diaphragm valve 100 is fed through a line to the control chamber 5, and the diaphragm 4 is closed. When the system has a flow demand, the pilot valve 800 senses the pressure drop and opens after the valve, the pilot valve 800 releases the pressure of the control cavity 5, and the diaphragm 4 is reset to open the valve to supply the flow demand.

And thirdly, under the condition that the system has flow, the pilot valve reacts to the tiny change of the pressure behind the valve, and the opening degree of the valve body is controlled by adjusting the pressure of the control cavity 5, so that the pressure behind the valve is continuously stable. The opening degree of the straight-through diaphragm valve 100 changes along with the position of the pilot valve 800, and when the pilot valve is closed, the straight-through diaphragm valve 100 is also closed; the pilot valve is open and the through diaphragm valve 100 is also open.

Therefore, the straight-through diaphragm valve 100 of the present embodiment achieves multiple purposes, is different from the valve structure on the market, has low cost, long service life and convenient maintenance, and can be applied to automatic sprinkler systems, water supply systems and the like with higher pressure as a main valve structure.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. A diaphragm valve bonnet, comprising:

the valve cover body (21), the valve cover body (21) is used for being connected with the valve body;

the valve cover comprises a valve cover body (21), and a guide protrusion (22), wherein the guide protrusion (22) is arranged on the end face of the valve cover body (21) used for being buckled with the valve body and used for guiding the switch of a diaphragm (4) in the valve body.

2. A diaphragm valve bonnet according to claim 1, wherein the guide boss (22) is a conical boss, and the large head end of the conical boss is connected to the bonnet body (21).

3. A through-the-diaphragm valve, comprising:

the valve comprises a straight-through valve body (1), wherein a through hole (3) used for being connected with a first external pipeline is formed in the straight-through valve body (1);

the valve cover (2) is connected with the through valve body (1), and a through hole (3) for connecting with a second external pipeline is formed in the valve cover (2);

the diaphragm (4) is arranged in the through valve body (1), and is fixed between the valve cover (2) and the through valve body (1); a control cavity (5) is formed between the diaphragm (4) and the valve cover (2), and a fluid cavity (6) is formed between the diaphragm (4) and the through valve body (1);

the guide protrusion (22) is arranged on the end face, used for being buckled with the through valve body (1), of the valve cover (2) and used for guiding the switch of the diaphragm (4).

4. A through diaphragm valve according to claim 3, wherein the diaphragm (4) comprises:

the sealing section (41) is used for plugging the fluid cavity (6), and a diaphragm framework (42) is wrapped in the sealing section (41) so that the sealing section (41) keeps a fixed shape;

the connecting section (43) is connected to one end of the sealing section (41) and used for being fixed between the valve cover (2) and the through valve body (1).

5. The through diaphragm valve of claim 4 where the diaphragm backbone (42) is a tapered backbone such that the sealing section (41) is a tapered sealing section; the connecting section (43) is connected to the large head end of the conical sealing section.

6. The through-diaphragm valve of claim 5 wherein the guide projection (22) is a conical projection, the larger end of which is connected to the valve cover (2).

7. The through-diaphragm valve of claim 6 wherein the taper of the tapered protrusion is the same as the taper of the tapered backbone.

8. The through diaphragm valve of claim 4 where the connecting section (43) is extended by the diaphragm of the sealing section (41).

9. A through diaphragm valve according to any of claims 5 to 7, wherein a valve body conical sealing surface (11) is provided in the fluid chamber (6) to sealingly engage the outer periphery of the conical sealing section when the diaphragm (4) is returned to closed.

10. The through-diaphragm valve of claim 9 where a tapered concave surface (12) is provided in the fluid chamber (6) to engage the bottom of the tapered sealing section and form a sealing pair when the diaphragm (4) is reset closed.

11. The straight-through diaphragm valve of any one of claims 3 to 8, wherein the guide projection (22) is provided with a hollow hole (222) for communicating with the second external pipeline.

12. A fluid control system comprising a through diaphragm valve according to any of claims 3 to 11, wherein the control chamber (5) is connected to the second external conduit to form a valve head end fluid passageway and the fluid chamber (6) is connected to the first external conduit to form a valve body end fluid passageway; by regulating and controlling the pressure of fluid in the valve cover end fluid channel and the valve body end fluid channel, the diaphragm (4) can move towards the direction close to the valve cover (2) along the guide bulge (22) and open the fluid cavity (6), or the diaphragm (4) can reset towards the direction far away from the valve cover (2) along the guide bulge (22) and close the fluid cavity (6).