Pressure reducing and stabilizing valve

Abstract

The utility model provides a pressure reducing and stabilizing valve, which belongs to the technical field of valves, and comprises a main valve, a first pressure sensor, a second pressure sensor, a guide valve, a needle valve, a ball valve and a controller, the main valve comprises a main valve body, a main valve rod, a main valve cover, a main diaphragm, a main valve core, a main valve seat and a first spring, and the outer edge of the main diaphragm is tightly pressed between the main valve cover and the main valve body. A main pressure regulating cavity is formed between the main diaphragm and the main valve cover, the main valve rod is provided with a valve disc and a pressing disc which are used for clamping the middle of the main diaphragm, the main valve cover is detachably connected with a cover body, the cover body is provided with a sliding sleeve, the main valve rod is arranged in a sliding mode in the axial direction of the sliding sleeve, and the first spring abuts against the position between the cover body and the pressing disc; the pressure change of the main inlet end and the main outlet end of the main valve can be monitored in real time, the pressure of the main outlet end is regulated and controlled to be kept stable, and when the first spring fails, the first spring can be taken out from the main pressure regulating cavity only by disassembling the cover body, so that the maintenance steps are simplified, and the maintenance efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely relates to pressure reducing and stabilizing valve. BACKGROUND

[0002] Pressure reducing and stabilizing valve, also known as pressure reducing valve, is an important equipment for controlling fluid pressure and flow, and is widely used in industrial automation, gas delivery, liquid pipeline and many other fields. It is a valve that reduces the inlet pressure to a required outlet pressure through adjustment and relies on the energy of the medium itself to automatically maintain stable outlet pressure. From the perspective of fluid mechanics, the pressure reducing valve is a throttling element with variable local resistance, that is, by changing the throttling area, the flow rate and kinetic energy of the fluid are changed, resulting in different pressure losses, thereby achieving the purpose of pressure reduction. Then, through the adjustment of the control and regulation system, the fluctuations of the pressure after the valve are balanced with the spring force, so that the pressure after the valve remains constant within a certain error range.

[0003] The prior art such as the patent with publication number CN202182220U discloses a safety pressure reducing valve, wherein the valve rod is installed between the valve body and the valve cover through a diaphragm, the center of the diaphragm is sealed and installed on the valve disc by a pressure plate, the edge of the diaphragm is sealed and installed between the valve body and the valve cover, a control chamber is formed between the diaphragm and the valve cover, and a spring is installed between the upper end surface of the diaphragm in the control chamber and the valve cover. When the several springs of the pressure reducing valve need to be repaired, the valve cover and the valve body need to be disassembled, the diaphragm is fixed between the valve cover and the valve body, and the diaphragm also needs to be reassembled. Therefore, the repair steps become cumbersome, and the repair efficiency is reduced. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the shortcomings and deficiencies of the prior art, and provides a pressure reducing and stabilizing valve.

[0005] The technical scheme adopted by the utility model is as follows: the utility model provides a pressure reducing and stabilizing valve, which comprises a main valve, a first pressure sensor, a second pressure sensor, a pilot valve, a needle valve, a ball valve and a controller. The main valve comprises a main valve body, a main valve rod, a main valve cover, a main diaphragm, a main valve core, a main valve seat and a first spring. The main valve body comprises a main inlet end, a main outlet end and a flow channel opening communicating the two. The first pressure sensor is connected with the main inlet end, and the second pressure sensor is connected with the main outlet end. The outer edge of the main diaphragm is pressed between the main valve cover and the main valve body. A main pressure regulating cavity is formed between the main diaphragm and the main valve cover. The main valve rod is provided with a valve disc and a pressure plate. The middle part of the main diaphragm is clamped between the valve disc and the pressure plate. The main valve core is arranged on the main valve rod and connected below the valve disc. The main valve seat is arranged at the flow channel opening. The main valve cover is detachably connected with a cover body. The cover body is provided with a sliding sleeve. The main valve rod is axially slidably arranged along the sliding sleeve. The main valve rod moves up and down with the main diaphragm. The first spring is pressed between the cover body and the pressure plate.

[0006] In some embodiments, the cover is provided with a positioning hole towards the first spring, and the upper end of the first spring is located in the positioning hole.

[0007] In some embodiments, the pilot valve comprises a motor, a secondary valve body, a secondary valve rod, a secondary valve cover, a secondary diaphragm, a secondary valve core, a secondary valve seat and a second spring, the secondary valve core is pressed against the secondary valve seat to form a seal under the action of the second spring, the motor, the first pressure sensor and the second pressure sensor are all connected to the controller, and the motor is used to adjust the pre-tightening force of the second spring on the secondary valve core to realize control of the pressure threshold of the main outlet end.

[0008] In some embodiments, the main inlet end is connected through a needle valve and a pressure regulating chamber, the main outlet end is connected through a ball valve and an outlet end of the pilot valve, and the inlet end of the pilot valve is connected with the pressure regulating chamber.

[0009] In some embodiments, a sealing disc is arranged between the main valve core and the valve disc, a soft seal is formed between the sealing disc and the valve seat, and a hard seal is formed between the main valve core and the valve seat.

[0010] In some embodiments, a fixing seat is arranged below the valve seat in the flow channel opening, a fixing ring is arranged at the center of the fixing seat, a plurality of passage openings are arranged between the fixing ring and the fixing seat, and the lower end of the main valve rod penetrates through the fixing ring and is in sliding fit with the fixing ring.

[0011] In some embodiments, a filter cover is arranged below the fixing seat on the main valve rod, the filter cover comprises an outer ring portion, an inner cylinder portion and a conical filter screen portion arranged between the outer ring portion and the inner cylinder portion, the outer ring portion is connected with the fixing seat, the main valve rod is arranged in up-down sliding fit with the inner cylinder portion and does not depart from the inner cylinder portion during up-down movement, a sedimentation groove is arranged at the bottom of the main valve body, a blowdown opening is arranged at the bottom of the sedimentation groove, a sealing plunger is detachably arranged on the blowdown opening, and the lower end of the filter cover extends into the sedimentation groove.

[0012] In some embodiments, a cleaning channel is arranged at the bottom of the main valve rod along the axial direction of the main valve rod, a sealing plug is arranged at the inlet of the cleaning channel, and a jet opening is arranged at the top of the conical filter screen portion.

[0013] The beneficial effects of the utility model are as follows:

[0014] 1. The utility model can monitor the pressure changes of the main inlet end and the main outlet end of the main valve in real time, and can control the pressure of the main outlet end to remain stable.

[0015] 2. When the first spring fails, the first spring can be taken out from the main pressure regulating chamber only by disassembling the cover, so that the maintenance steps are simplified and the maintenance efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor, which still belong to the scope of the present application.

[0017] Figure 1 It is a schematic diagram of a pressure reducing and stabilizing valve in the present application;

[0018] Figure 2 It is a schematic diagram of a main valve in the present application;

[0019] Figure 3 It is a partial schematic diagram of a main valve in the present application Figure 1 ;

[0020] Figure 4 It is a partial schematic diagram of a main valve in the present application Figure 2 . DETAILED DESCRIPTION

[0021] The following description provides specific application scenarios and requirements of the present specification, so as to enable those skilled in the art to manufacture and use the contents in the present specification. Various local modifications of the disclosed embodiments are obvious to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of the present specification. Therefore, the present specification is not limited to the shown embodiments, but is consistent with the widest scope of the claims.

[0022] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0023] Secondly, the terms "first", "second" and similar words do not represent any order, quantity or importance, but are only used to distinguish different components, and should not be understood as a limitation on the embodiments of the present application.

[0024] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral constructions; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0025] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0027] like Figures 1 to 4 As shown in the figure, this specification provides a pressure reducing and stabilizing valve, including a main valve 1, a first pressure sensor 2, a second pressure sensor 3, a pilot valve 4, a needle valve 5, a ball valve 6, and a controller 7. The main valve 1 includes a main valve body 100, a main valve stem 101, a main valve cover 102, a main diaphragm 103, a main valve core 104, a main valve seat 105, and a first spring 106. The main valve body 100 includes a main inlet end 107, a main outlet end 108, and a flow channel 109 connecting the two. The first pressure sensor 2 is connected to the main inlet end 107 for detecting its pressure, and the second pressure sensor 3 is connected to the main outlet end 108 for detecting its pressure. Generally, connection ports are opened on the side walls of the main inlet end 107 and the main outlet end 108 to connect to the corresponding pressure sensors, so that the pressure changes of the main inlet end 107 and the main outlet end 108 can be monitored in real time.

[0028] The outer edge of the main diaphragm 103 is pressed between the main valve cover 102 and the main valve body 100, forming a main pressure regulating chamber 110 between the main diaphragm 103 and the main valve cover 102. The main pressure regulating chamber 110 is a sealed cavity. A valve disc 111 and a pressure plate 112 are provided on the main valve stem 101. The middle part of the main diaphragm 103 is clamped between the valve disc 111 and the pressure plate 112. The main valve core 104 is disposed on the main valve stem 101 and connected to the main valve body 100. Below the valve disc 111, the main valve seat 105 is disposed at the flow channel opening 109. A cover body 113 is detachably connected to the main valve cover 102, for example, by a threaded connection or bolt connection. A sliding sleeve 114 is provided on the cover body 113. The main valve stem 101 is axially slidable along the sliding sleeve 114. The main valve stem 101 moves up and down with the main diaphragm 103. The first spring 106 presses against the cover body 113 and the pressure plate 112. With this configuration, if the first spring 106 fails, only the cover body 113 needs to be removed to remove the first spring 106 from the main pressure regulating chamber 110, simplifying the maintenance steps and improving maintenance efficiency.

[0029] In some embodiments, the cover 113 is provided with a positioning hole 115 towards the first spring 106, the upper end of the first spring 106 is located in the positioning hole 115, which can play a positioning role on the first spring 106, improve the convenience of assembly, and the stability of the first spring 106 during work.

[0030] In some embodiments, the pilot valve 4 includes a motor, a secondary valve body, a secondary valve rod, a secondary valve cover, a secondary diaphragm, a secondary valve core, a secondary valve seat and a second spring, under the action of the second spring, the secondary valve core is pressed against the secondary valve seat to form a seal, the specific structure of the pilot valve 4 can refer to the corresponding valve in the prior art, the motor, the first pressure sensor 2 and the second pressure sensor 3 are all connected to the controller 7, and the motor is used to adjust the pre-tightening force of the second spring on the secondary valve core to realize control of the pressure threshold of the main outlet end 108.

[0031] The main inlet end 107 is connected through the needle valve 5 and the main pressure regulating chamber, the main outlet end is connected through the ball valve 6 and the outlet end of the pilot valve 4, and the inlet end of the pilot valve 4 is connected with the main pressure regulating chamber.

[0032] In this way, when the flow of the main inlet end 107 or the main outlet end 108 changes, the dynamic pressure and the static pressure of the main inlet end 107 can be maintained at a set pressure threshold, the pressure threshold can be adjusted within a certain range through the pilot valve 4, and compared with the traditional pilot valve 4 which is adjusted by screwing the screw rod by hand, the motor is used for adjustment in the application, and the controller is connected to realize automatic adjustment.

[0033] Common pressure regulating working principle: in work, the needle valve 5 and the ball valve 6 are opened, the medium flows from the main inlet end 107 to the pilot valve 4 through the needle valve 5 and the main pressure regulating chamber 110, the secondary valve core of the pilot valve 4 is opened, the medium flows to the main outlet end 108 through the flow passage of the pilot valve 4, and the pressure of the main pressure regulating chamber 110 is reduced. Under the action of the medium pressure, the main valve core 104 is opened, and the medium flows to the main outlet end 108 through the flow passage port 109.

[0034] When the pressure behind the valve rises, the medium pressure below the secondary diaphragm and the second spring are balanced, the main valve 1 and the pilot valve 4 maintain a certain opening, and when the pressure behind the valve rises beyond the pressure threshold, the medium pressure below the secondary diaphragm also rises, so that the secondary valve core is closed, the flow of the medium out of the pilot valve 4 becomes small, the pressure of the main pressure regulating chamber 110 gradually rises, and since the area of the main diaphragm 103 is larger than the area of the main valve core 104, the pressure of the main pressure regulating chamber 110 drives the opening of the main valve core 104 to decrease, so that the pressure of the main outlet end 108 decreases and returns to the normal working pressure value.

[0035] When the pressure behind the valve drops, the pressure under the secondary diaphragm also drops, and the secondary spool opening increases under the action of the second spring, the medium outflow guide valve 4 flow increases, the main pressure chamber 110 pressure drops, the main valve core 104 opening increases under the action of the pressure difference, the main outlet end 108 pressure rises, and the normal working pressure value is restored again.

[0036] Wherein, the needle valve 5 can adjust the response speed of the main valve 1, generally the needle valve opening increases, the faster the response speed of the main valve 1.

[0037] Wherein, the ball valve 6 plays a role in detecting the main valve 1, when the ball valve 6 is closed, the outlet of the main pressure chamber 110 is closed, and the pressure gradually rises, so that the main valve 1 is closed, if the main valve 1 is not closed at this time, it means that there is a fault in the main valve 1, such as being stuck by impurities or damage to the sealing structure. In addition, when the guide valve 4 fails, the ball valve 6 can also quickly close the main valve 1.

[0038] In some embodiments, a sealing disc 116 is provided between the main valve core 104 and the valve disc 111, a soft seal is formed between the sealing disc 116 and the valve seat, and a hard seal is formed between the main valve core 104 and the valve seat, which has a soft and hard double seal, greatly improving the sealing performance.

[0039] In some embodiments, a fixed seat 117 is provided below the valve seat in the flow channel opening 109, a fixed ring 118 is provided at the center of the fixed seat 117, and a plurality of channel openings 119 are provided between the two, and the lower end of the main valve rod 101 passes through the fixed ring 118 and is in sliding cooperation with it, which improves the stability and reliability of the main valve rod 101 when moving up and down.

[0040] In some embodiments, as shown in Figure 4 The lower end of the main valve rod 101 is connected to the fixed seat 117, the main valve rod 101 slides up and down relative to the inner cylinder portion 122, and is always separated from the inner cylinder portion 122 during its upward and downward movement, the bottom of the main valve body 100 is provided with a sediment groove 124, the side wall of the sediment groove 124 is preferably conical, the bottom of the sediment groove 124 is provided with a blowdown opening, and a sealing plunger 125 is detachably arranged on the blowdown opening, the lower end of the filter cover 120 extends into the sediment groove 124, so that the filtering area is increased as much as possible, and the impurities in the filter cover fall into the sediment groove 124 as much as possible, so as to facilitate quick cleaning.

[0041] Further, the bottom of the main valve rod 101 is provided with a cleaning channel 126 along its axial direction, the inlet of the cleaning channel 126 is provided with a sealing plug 127, the top of the main valve rod 101 is provided with a plurality of spray openings 128 which are uniformly arranged along the circumferential direction of the cleaning channel 126 and are spaced apart in the up-down direction. When the filter cover 120 needs to be cleaned, the sealing plug 125 and the sealing plug 127 are opened, and the spray pipe is inserted into the cleaning channel 126, so that the filter cover 120 can be back-flushed from the inside, and the impurities washed down can be discharged from the drain outlet along the sediment groove 124.

[0042] In view of the foregoing, after reading the present detailed disclosure, those skilled in the art can understand that the foregoing detailed disclosure can be presented only in an exemplary manner and can not be limiting. Although not explicitly stated herein, those skilled in the art can understand that the present application requires to encompass various reasonable changes, improvements and modifications to the embodiments. These changes, improvements and modifications are intended to be presented by the present application and are within the spirit and scope of the exemplary embodiments of the present application.

[0043] In addition, it should be understood that in the foregoing description of the embodiments of the present application, for the purpose of helping to understand one feature, the present application combines various features in a single embodiment, figure or its description for the purpose of simplifying the present application. However, this does not mean that the combination of these features is necessary, and those skilled in the art can well understand one part of the device as a separate embodiment when reading the present application. That is, the embodiments in the present application can also be understood as the integration of multiple secondary embodiments. And the content of each secondary embodiment is also valid when there are less than all the features of a single previously disclosed embodiment.

[0044] Finally, it should be understood that the embodiments of the application disclosed herein are illustrative of the principles of the application. Other modified embodiments are also within the scope of the present application. Therefore, the embodiments disclosed in the present application are only examples and not limitations. Those skilled in the art can take alternative configurations according to the embodiments in the present application to implement the application in the present application. Therefore, the embodiments of the present application are not limited to the embodiments precisely described in the application.

Claims

1. A pressure reducing and stabilizing valve, characterized by, The main valve, the first pressure sensor, the second pressure sensor, the pilot valve, the needle valve, the ball valve and the controller, the main valve includes a main valve body, a main valve stem, a main valve cover, a main diaphragm, a main valve core, a main valve seat and a first spring, the main valve body includes a main inlet end, a main outlet end and a flow channel opening, the first pressure sensor and the main inlet end are connected, the second pressure sensor and the main outlet end are connected, the outer edge of the main diaphragm is pressed between the main valve cover and the main valve body, the main diaphragm and the main valve cover form a main pressure regulating cavity, the main valve stem is provided with a valve disc and a pressure disc, the middle part of the main diaphragm is clamped between the valve disc and the pressure disc, the main valve core is arranged on the main valve stem and connected below the valve disc, the main valve seat is arranged at the flow channel opening, the cover body is detachably connected to the main valve cover, the sleeve is arranged on the cover body, the main valve stem is axially arranged along the sleeve, the main valve stem moves up and down with the main diaphragm, and the first spring is pressed between the cover body and the pressure disc.

2. The pressure reducing regulator valve of claim 1, wherein The cover body is provided with a positioning hole facing the first spring, and the upper end of the first spring is located in the positioning hole.

3. The pressure reducing regulator valve of claim 1, wherein The pilot valve includes a motor, a secondary valve body, a secondary valve stem, a secondary valve cover, a secondary diaphragm, a secondary valve core, a secondary valve seat and a second spring, under the action of the second spring, the secondary valve core is pressed against the secondary valve seat to form a seal, the motor, the first pressure sensor and the second pressure sensor are all connected to the controller, and the motor is used to adjust the pre-tightening force of the second spring on the secondary valve core to realize control of the pressure threshold of the main outlet end.

4. The pressure reducing regulator valve of claim 1, wherein The main inlet end is connected with the main pressure regulating cavity through the needle valve, the main outlet end is connected with the outlet end of the pilot valve through the ball valve, and the inlet end of the pilot valve is connected with the main pressure regulating cavity.

5. The pressure reducing regulator valve of claim 1, wherein A sealing disc is arranged between the main valve core and the valve disc, a soft seal is formed between the sealing disc and the valve seat, and a hard seal is formed between the main valve core and the valve seat.

6. The pressure reducing regulator valve of claim 1, wherein A fixing seat is arranged below the valve seat in the flow channel opening, a fixing ring is arranged at the center of the fixing seat, a plurality of channel openings are arranged between the fixing ring and the fixing seat, and the lower end of the main valve stem penetrates through the fixing ring and is in sliding cooperation with the fixing ring.

7. The pressure reducing regulator valve of claim 6, wherein A filter cover is arranged below the fixing seat on the main valve stem, the filter cover includes an outer ring portion, an inner cylinder portion and a conical filter screen portion arranged between the outer ring portion and the inner cylinder portion, the outer ring portion is connected with the fixing seat, the main valve stem is arranged in up-and-down sliding cooperation with the inner cylinder portion, and the main valve stem does not depart from the inner cylinder portion during the up-and-down movement, a sediment groove is arranged at the bottom of the main valve body, a drain opening is arranged at the bottom of the sediment groove, a sealing plunger is detachably arranged on the drain opening, and the lower end of the filter cover extends into the sediment groove.

8. The pressure reducing regulator valve of claim 7, wherein A cleaning channel is arranged on the bottom of the main valve stem in the axial direction, a sealing plug is arranged at the inlet of the cleaning channel, and a jetting opening is arranged at the top of the conical filter screen portion.

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