Floating ball pilot-operated type hydraulic control stop valve

Abstract

The utility model relates to a floating ball pilot-operated type hydraulic control stop valve which comprises a valve body, and a main liquid path and an auxiliary pilot-operated liquid path are arranged on the valve body. The main liquid path is provided with a main liquid inlet and a main liquid outlet, and the auxiliary pilot liquid path is provided with a pilot liquid outlet; a main valve element assembly is arranged on the main liquid way, and a floating ball pilot valve assembly is arranged on the auxiliary pilot liquid way. The valve body is further provided with a main valve installation cavity communicated with the main liquid path and the auxiliary pilot liquid path, the main valve element assembly comprises a main valve element which moves in a reciprocating mode to be blocked in the main liquid path, a main reset spring is arranged between the main valve element and the valve body, and a pilot liquid control cavity is formed in the side, opposite to the main liquid path, between the valve body and the main valve element and communicated with the auxiliary pilot liquid path. The main valve element is further provided with an automatic control flow channel penetrating through the main liquid path and the pilot hydraulic control cavity. The plugging cross-sectional area of one side, close to the main liquid path, of the main valve core is smaller than the cross-sectional area of one side, close to the pilot hydraulic control cavity, of the main valve core; pilot-operated type opening and closing of the stop valve are achieved in a pure hydraulic control mode, the overall structure is simple, and control is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of globe valves, in particular to a floating ball pilot-operated hydraulic control globe valve. Background Art

[0002] At present, when the hydraulic support system in the coal mining face underground in a coal mine returns liquid, most of the liquid returns to the liquid tank body through the return liquid pipeline for recycling. During daily maintenance or in case of emergency, in order to cut off the return liquid pipeline, a manual or electric ball valve type globe valve needs to be installed on the main return liquid pipeline for opening and closing control. When the hydraulic system of the coal mining face is working normally during daily operation, the main return liquid pipeline of the system should be kept unblocked, and the manual or electric ball valve type globe valve should be kept open so that the coal mining face can return liquid smoothly; when the liquid level reaches the set position of the liquid tank, in order to prevent the liquid inside the liquid tank from being too high, generally, the liquid supply channel is directly closed by electric or manual means.

[0003] In the prior art, there is a form of using a floating ball pilot-operated globe valve to control the opening and closing of the globe valve. Generally, a floating ball is arranged inside the liquid tank, and a globe valve is arranged outside the liquid tank. When the liquid level rises, the floating ball acts, and then the opening and closing of the globe valve are controlled by pilot control through an intermediate medium. The existing intermediate medium generally adopts electrical communication control or hydraulic control methods. For example, in the Chinese utility model patent document with the authorization announcement number CN215208780U, a total water inlet treatment device for a fully mechanized coal mining face in a coal mine is disclosed, which discloses that the raw water pressurization device includes a raw water tank, a hydraulic remote control globe valve, and a first pilot floating ball switch, and discloses that when the water level in the raw water tank drops, the first pilot floating ball switch closes and controls the opening of the hydraulic remote control globe valve, so that external water sources enter the raw water tank, and the hydraulic remote control globe valve is electrically connected to the first pilot floating ball switch through a data line. However, in this way of electric pilot hydraulic control, when a power failure or signal transmission interruption occurs, the globe valve cannot be closed in time, and further, the hydraulic control globe valve fails to be closed in time, resulting in the emulsified liquid overflowing from the liquid tank, and the control is unstable.

[0004] In the prior art, there is also a method of using a single mechanical hydraulic pilot control to achieve. For example, a pilot control chamber is arranged on the valve body of the globe valve, and a floating ball valve is arranged on the liquid path. The opening and closing of the floating ball valve are used to control the on-off of the pilot liquid, and then the on-off of the globe valve is controlled. However, this pilot control method requires an additional auxiliary pilot liquid path for high-pressure pilot liquid to be provided on the valve body, and the supply and return liquid circulation of the pilot liquid needs to be controlled. Its pipeline design is relatively complex, which greatly affects the structural compactness design of the valve body, and the overall structure is too complex and the cost is relatively high. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a floating ball pilot-operated hydraulic control globe valve to solve the problems of easy electrical failure and complex structure in the prior art when the globe valve adopts floating ball pilot control.

[0006] To solve the above problems, the float-guided pilot-operated liquid control globe valve involved in the present utility model adopts the following technical solutions:

[0007] The float-guided pilot-operated liquid control globe valve includes a valve body, on which a main liquid path and an auxiliary pilot liquid path are provided; the main liquid path has a main liquid inlet and a main liquid outlet, and the auxiliary pilot liquid path has a pilot liquid outlet for discharging the pilot liquid;

[0008] A main spool assembly is provided on the main liquid path, and a float-guided pilot valve assembly for controlling the on-off of the auxiliary pilot liquid path is provided on the auxiliary pilot liquid path;

[0009] The valve body also has a main valve installation cavity communicating the main liquid path and the auxiliary pilot liquid path. The main spool assembly includes a main spool that reciprocates to block the main liquid path. A main return spring is provided between the main spool and the valve body. On the side of the valve body and the main spool facing away from the main liquid path, there is a pilot liquid control cavity, which is communicated with the auxiliary pilot liquid path. An automatic control flow channel is also provided on the main spool to penetrate the main liquid path and the pilot liquid control cavity; the cross-sectional area of the blocking section on the side of the main spool close to the main liquid path is smaller than the cross-sectional area on the side close to the pilot liquid control cavity;

[0010] When the auxiliary pilot liquid path is blocked by the float-guided pilot valve assembly, the liquid in the main liquid path enters the pilot liquid control cavity through the automatic control flow channel. The pressure on the side of the main spool close to the main liquid path is less than the pressure on the side of the pilot liquid control cavity, causing the main spool to move and block the main liquid path; when the auxiliary pilot liquid path is unobstructed, the liquid in the main liquid path enters the pilot liquid control cavity through the automatic control flow channel and is discharged through the pilot liquid outlet.

[0011] In a preferred embodiment, the float-guided pilot valve assembly includes a hinged rod rotatably suspended outside the valve body. A float is connected to the end of the hinged rod. The head end of the hinged rod is abutted and cooperated with a pilot valve rod for blocking the pilot liquid path and provided in the auxiliary pilot liquid path. The movement of the float drives the hinged rod to rotate, causing the pilot valve rod to block and open the auxiliary pilot liquid path.

[0012] In a preferred embodiment, the pilot valve rod movably blocks at the pilot liquid outlet.

[0013] In a preferred embodiment, a valve sleeve is connected to the pilot liquid outlet. The axis of the valve sleeve is the same as the axis of the pilot liquid outlet. The inner end of the pilot valve rod is guided and inserted into the valve sleeve. A drain port communicating with the pilot liquid outlet is opened on the side wall of the valve sleeve. An anti-disengagement structure for axially limiting and anti-disengaging cooperation with the pilot valve rod is also provided on the valve sleeve. The outer end of the hinged rod has a cooperating portion for abutting against the tail end of the pilot valve rod.

[0014] In a preferred embodiment, a support is mounted on the side wall of the valve body. The articulated rod is rotatably assembled on the support. A sealing gasket sleeve is coaxially provided on the support corresponding to the inner end position of the valve sleeve. The outer diameter of the pilot valve rod is larger than the inner diameter of the sealing gasket sleeve so that the pilot valve rod abuts against the sealing gasket sleeve to block the auxiliary pilot liquid path.

[0015] In a preferred embodiment, the anti - detachment structure includes a limiting step provided on the inner side wall of the valve sleeve. The limiting step is located outside the liquid discharge port. A ring platform is provided on the outer peripheral surface of the inner end of the pilot valve rod.

[0016] In a preferred embodiment, the mating part is composed of an elbow arm fixedly connected to the tail end of the articulated rod.

[0017] As described above, the present invention has the following beneficial effects: Compared with the prior art, for the floating - ball pilot - type liquid - controlled globe valve involved in the present invention, by designing the valve core of the globe valve to have a self - controlled flow channel structure and arranging a floating - ball pilot valve assembly in the auxiliary pilot liquid path communicating with the pilot liquid - controlled cavity. During actual operation, most of the liquid in the main liquid path can be discharged from the liquid outlet autonomously during the normal process, and a small part of the liquid enters the auxiliary pilot liquid path through an extremely fine self - controlled flow channel and is discharged outwards through the pilot liquid outlet. During the process of opening the main liquid path of the globe valve, the existing normal flow can be satisfied; when the liquid level in the liquid tank gradually rises to a certain height, the floating - ball pilot valve assembly controls the blocking of the auxiliary pilot liquid path. At this time, the pilot liquid - controlled cavity is blocked, and the liquid entering the pilot liquid - controlled cavity through the self - controlled flow channel is filled. Since the liquid pressure is the same everywhere in the main channel and the pilot liquid - controlled cavity, and on the premise that the blocking cross - sectional areas at both ends of the valve core are different, the forces at both ends are different. At this time, the high - pressure liquid in the pilot liquid - controlled cavity pushes the main valve core downward until the main liquid path is closed, so that the globe valve can be completely closed. By converting the liquid in the main liquid path into pilot - control liquid, there is no need to additionally attach high - pressure pilot liquid, the corresponding pressurizing structure, and the electrical control structure, etc. The overall structure is more compact. The pilot - type opening and closing of the globe valve is realized in a pure liquid - controlled form. The overall structure is simple and the control is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments:

[0019] Figure 1 It is a schematic structural diagram of a specific embodiment of the floating - ball pilot - type liquid - controlled globe valve of the present invention;

[0020] Figure 2 is Figure 1 a half - sectional view of

[0021] Figure 3 is Figure 2 a sectional view taken along the line B - B in

[0022] Figure 4 is Figure 2 the sectional view along the C-C direction in

[0023] Figure 5 is Figure 2 the sectional view along the D-D direction in

[0024] Figure 6 is Figure 5 the top view of after removing the electromagnetic pilot valve assembly;

[0025] Figure 7 is Figure 5 the schematic cross-sectional view of the first pilot hydraulic circuit in

[0026] Figure 8 is Figure 3 the schematic cross-sectional view of the main spool valve assembly in

[0027] Figure 9 is Figure 3 the schematic cross-sectional view of the bypass spool valve assembly in

[0028] Figure 10 is Figure 6 the schematic cross-sectional view of the manual hydraulic control pilot valve assembly in

[0029] Figure 11 is Figure 1 the schematic cross-sectional view of the float pilot valve assembly in

[0030] Figure 12 is Figure 11 the partial enlarged view at A in

[0031] Figure 13 is Figure 1 the perspective view of the main hydraulic circuit layout of the valve block in

[0032] Figure 14 is Figure 1 the perspective view of the layout of the pilot control hydraulic circuit of the valve block in

[0033] Explanation of reference numerals:

[0034] 1 - valve block;

[0035] 11 - main hydraulic circuit; 111 - main inlet port; 112 - main outlet port; 113 - bypass return port; 114 - first transverse channel; 115 - main channel; 116 - second transverse channel;

[0036] 12 - first pilot hydraulic circuit; 121 - pilot inlet port; 122 - first longitudinal channel; 123 - first pilot transverse channel; 124 - drainage channel; 125 - hydraulic control channel; 126 - electromagnetic pilot inlet port; 127 - electromagnetic pilot drainage port; 128 - electromagnetic pilot hydraulic control port;

[0037] 13 - Second pilot hydraulic circuit; 131 - Second longitudinal channel; 132 - Second pilot transverse channel; 133 - Pilot hole; 134 - Pilot liquid outlet 134;

[0038] 14 - Main valve installation cavity; 15 - Bypass check valve installation cavity; 16 - Manual hydraulic control pilot installation cavity; 17 - Pressure sensor interface; 18 - Plugging block;

[0039] 2 - Electromagnetic pilot valve assembly;

[0040] 3 - Float pilot valve assembly; 31 - Float; 32 - Hinge rod; 33 - Pilot valve rod; 331 - Ring platform; 34 - Support; 35 - Pilot valve sleeve; 351 - Limit step; 352 - Drainage port; 36 - Toggle arm; 37 - Sealing gasket sleeve;

[0041] 4 - Main spool valve assembly 4; 41 - Main end plug; 42 - Main return spring; 43 - Valve sleeve; 44 - Main spool; 45 - Damping plug; 46 - Automatic control hole; 47 - Main pilot hydraulic control cavity; 48 - Main communication hole; 49 - Valve inlet hole; 410 - Valve outlet hole;

[0042] 5 - Bypass spool valve assembly; 51 - Screw; 52 - Valve gasket; 53 - Bypass spool; 54 - Plug; 55 - Accommodating cavity; 56 - Hydraulic control hole;

[0043] 6 - Manual hydraulic control pilot valve assembly; 61 - Pilot valve seat; 62 - Pilot spool; 63 - Pilot pressure sleeve; 64 - Pilot return spring; 65 - Pilot end plug; 66 - Screw; 67 - Baffle; 68 - Valve rod; 69 - Handwheel; 610 - Auxiliary pilot hydraulic control cavity; 611 - Pilot communication hole;

[0044] 7 - Check valve assembly; 8 - Pilot filter assembly; 9 - Sealing plate. Detailed implementation manners

[0045] In order to make the technical objectives, technical solutions and beneficial effects of the present utility model clearer, the technical solutions of the present utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model, and are not used to limit the present utility model, that is, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Usually, the components of the embodiments of the present utility model described and shown herein can be arranged and designed in various different configurations.

[0046] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "first", "second" and similar words do not denote any order, quantity or importance, but are only used to distinguish different components. The terms "installed", "connected" and "coupled" should be understood in a broad sense. For example, they can be mechanical connections or electrical connections, or the communication inside two elements. They can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0048] Specific embodiments of the floating ball pilot-operated liquid control globe valve involved in the present utility model are shown in the figure. The floating ball pilot-operated liquid control globe valve includes a valve body, which is a valve block 1 composed of several channels in this embodiment. The valve block 1 is a rectangular block structure as a whole. A number of channels are arranged on the valve block 1. The channels include a main liquid path 11, and the main liquid path 11 has a main liquid inlet 111, a main liquid outlet 112 and a bypass return liquid port 113 that are respectively communicated with the main liquid inlet 111.

[0049] The channel arrangement structure of the main liquid path 11 on the valve block 1 is as follows. Two first horizontal channels 114 arranged side by side at the same height and spaced apart are provided on the left side wall of the valve block 1. The left port of the horizontal channel forms the main liquid inlet 111. Both of the two first horizontal channels 114 extend in the left-right direction. A main channel 115 extending in the front-back direction is arranged inside the valve block 1. The above two first horizontal channels 114 communicate with the main channel 115, and the first horizontal channels 114 and the main channel 115 are arranged at the same height. A pressure sensor interface 17 for detecting the hydraulic pressure of the emulsion liquid in the main channel 115 is arranged at the rear end of the main channel 115, and a sealing plug 18 is provided at the other end in a sealed manner; in addition, two second horizontal channels 116 arranged side by side and spaced apart are provided on the right side wall of the valve block 1. The right port of one of the second horizontal channels 116 forms the main liquid outlet 112, and the right port of the other second horizontal channel 116 forms the bypass return liquid port 113. Both of the two second horizontal channels 116 are higher than the main channel 115, and the height of the main liquid outlet 112 is lower than the height of the bypass return liquid port 113. The left ends of the two second horizontal channels 116 are respectively communicated with the main channel 115 through an up-down extending installation cavity. The two installation cavities are respectively the main valve installation cavity 14 and the bypass return valve installation cavity 15. A main valve core assembly for controlling the on-off of the main liquid outlet 112 is sealed and installed in the main valve installation cavity 14, and a bypass valve core assembly 5 is sealed and installed in the bypass return valve installation cavity 15.

[0050] In the above composition form of the main liquid path 11, during the actual flow process of the emulsion liquid, the emulsion liquid led out from the hydraulic support hydraulic system enters the first horizontal channel 114 through the main liquid inlet 111, then flows through the main channel 115, passes through the main valve installation cavity 14 and then enters the main liquid outlet 112, and then enters the liquid tank body through the main liquid outlet 112; when the liquid inlet needs to be cut off for control, the main valve core 44 is driven to block the main liquid outlet 112, and the emulsion liquid flows into the bypass return valve installation cavity 15 in the main channel 115, enters the bypass return liquid port 113 after passing through the bypass valve core assembly 5, and then flows into the main return liquid pipeline system through the bypass return liquid port 113.

[0051] In order to be able to control the above main valve core assembly and bypass valve core assembly 5 and realize the on-off control of the main liquid path 11, a pilot control liquid path is also provided on the valve block 1. The pilot control liquid path includes a first pilot liquid path 12 and a second pilot liquid path 13.

[0052] The layout structure of the first pilot hydraulic circuit 12 on the valve block 1 is as follows. The first pilot hydraulic circuit 12 includes a first longitudinal channel 122 arranged at the front top of the valve block 1. The first longitudinal channel 122 extends from front to back to the middle position of the front and back of the valve block 1. The front end inlet of the first longitudinal channel 122 forms a pilot inlet 121. Correspondingly, two mounting cavities are arranged through at the same height position as the first longitudinal channel 122 on the left side wall of the valve block 1. The two mounting cavities are arranged side by side at intervals in the front-back direction and extend in the left-right direction. Among them, a pilot filter assembly 8 is arranged in the front mounting cavity and is connected to the first longitudinal channel 122, which is used to filter impurities from the high-pressure pilot liquid entering the first pilot hydraulic circuit 12. A one-way valve assembly 7 is arranged in the rear mounting cavity to control the one-way flow of the pilot liquid and prevent the pilot liquid from flowing back. A first pilot transverse channel 123 is arranged on the side wall of the rear mounting cavity. The first pilot transverse channel 123 extends in the left-right direction to the middle position of the valve block 1 and finally penetrates upward through the top of the valve block 1. The outlet of the first pilot transverse channel 123 forms an electromagnetic pilot inlet 126. At the same time, two additional branch channels are also opened at the middle position of the top of the valve block 1. One of the branch channels extends to the rear side wall of the valve block 1 after entering the valve block 1. This branch channel is a drain channel 124, and its inlet forms an electromagnetic pilot drain port 127. The other branch channel is a hydraulic control channel 125, which extends backward after entering the valve block 1. The inlet of this branch channel forms a hydraulic control port 128 for electromagnetic pilot hydraulic control. Correspondingly, an electromagnetic pilot valve assembly 2 is installed on the top of the valve block 1. The electromagnetic pilot valve assembly 2 is basically the same as the electromagnetic pilot valve assembly 2 in the prior art. The inlet inside it is connected to the electromagnetic pilot inlet 126, the drain port is connected to the electromagnetic pilot drain port 127, and the control port is connected to the electromagnetic pilot hydraulic control port 128.

[0053] At the tail end of the above-mentioned hydraulic control channel 125, a manually controlled pilot mounting cavity 16 extending up and down is connected. The manually controlled pilot mounting cavity 16 penetrates upward through the valve block 1. A manually controlled pilot valve assembly 6 is sealed and assembled in the manually controlled pilot mounting cavity 16. After the pilot liquid enters the manually controlled pilot valve assembly 6 through the hydraulic control channel 125, it can realize the pilot opening and closing control of the manually controlled pilot valve assembly 6, and further realize the on-off control of the second pilot hydraulic circuit 13.

[0054] In the above arrangement form of the first pilot hydraulic circuit 12, during actual use, the high-pressure pilot hydraulic fluid enters the first longitudinal channel 122 through the pilot inlet 121, and after being filtered by the pilot filter assembly 8, it enters the check valve, and then enters the electromagnetic check valve assembly 7 through the first pilot transverse channel 123. Through the on-off control of the electromagnetic check valve assembly 7, the electromagnetic pilot inlet 126 is selectively connected to the electromagnetic pilot drain port 127 and the electromagnetic pilot hydraulic control port 128, so as to realize the discharge of the high-pressure pilot hydraulic fluid and the introduction of the high-pressure pilot hydraulic fluid into the electromagnetic pilot hydraulic control port 128, thereby realizing the pilot opening and closing control of the manual hydraulic control pilot valve assembly 6, and further realizing the on-off control of the second pilot hydraulic circuit 13.

[0055] The arrangement form of the second pilot hydraulic circuit 13 on the valve block 1 is as follows. A second longitudinal channel 131 is arranged below the manual hydraulic control pilot installation cavity 16. The second longitudinal channel 131 extends in the front-rear direction, and its side wall communicates with the manual hydraulic control pilot installation cavity 16 upward. The front end of the second longitudinal channel 131 is connected with a second pilot transverse channel 132 extending to the right. The right end of the second pilot transverse channel 132 extends to the right side of the valve block 1, thereby connecting the second pilot hydraulic circuit 13 with the outside of the valve block 1. The second pilot transverse channel 132 constitutes the pilot pipeline outlet for the pilot hydraulic fluid to flow out of the valve block 1 and enter the liquid tank body after passing through the pilot control hydraulic circuit. A pilot hole 133 communicating with the side wall of the main valve installation cavity 14 is opened on the lateral side wall at the head end of the second longitudinal channel 131. The pilot hole 133 allows the pilot hydraulic fluid in the second pilot hydraulic circuit 13 to flow through, so as to facilitate the opening and closing control of the main valve core assembly 4.

[0056] In the above arrangement form of the second pilot hydraulic circuit 13, during actual use, the emulsion liquid entering from the main valve core assembly 4 enters the second pilot hydraulic circuit 13 through the pilot hole 133. When the manual hydraulic control pilot valve assembly 6 is controlled to cut off the second pilot hydraulic circuit 13, the above-mentioned pilot pipeline outlet is blocked, and the pilot emulsion liquid cannot flow; when the manual hydraulic control pilot valve assembly 6 opens the second pilot hydraulic circuit 13, the above-mentioned pilot pipeline outlet is opened, and the pilot emulsion liquid is discharged outside the valve block 1 through the pilot pipeline outlet and enters the liquid tank body.

[0057] In order to ensure the hydraulic circuit control of the pilot type globe valve, a floating ball pilot valve assembly 3 is also movably plugged at the above-mentioned pilot pipeline outlet. The floating ball pilot valve assembly 3 selects whether to block the pilot pipeline outlet according to the liquid level height in the liquid tank body, and then closes the second pilot hydraulic circuit 13, so as to realize the situation of blocking the main valve core assembly 4.

[0058] The above is the layout form of the respective channel structures of the valve block 1. Of course, in this embodiment, the above channel layouts are all for further precise design under the conditions of meeting compact structure and reasonable layout. In other embodiments, the layout forms of the respective channels on the valve block 1 may not be limited, and those skilled in the art can arbitrarily design the corresponding structural forms according to actual needs, only ensuring the connection forms of the respective channels.

[0059] In order to achieve the opening and closing control of the respective channels, different valve components are arranged in different installation cavities.

[0060] The main spool valve assembly 4 includes a main spool 44 that reciprocates to block in the main liquid path 11. A main return spring 42 is provided between the main spool 44 and the valve block 1. On the side of the valve block 1 and the main spool 44 facing away from the main liquid path 11, there is a main pilot hydraulic control cavity 47 for accommodating high-pressure pilot liquid. The main pilot hydraulic control cavity 47 is communicated with the second pilot liquid path 13. An automatic control flow channel that penetrates the main liquid path 11 and the main pilot control cavity is also provided on the main spool 44. The cross-sectional area of the blocking surface of the main spool 44 on the side close to the main liquid path 11 is smaller than the cross-sectional area of the blocking surface on the side close to the main pilot hydraulic control cavity 47. During the actual control process, the emulsion liquid in the main liquid path 11 can enter the main pilot control cavity through the automatic control flow channel, enter the pilot hole 133 through the main pilot control cavity, and then enter the second pilot liquid path 13.

[0061] Specifically, the main valve installation cavity 14 is connected with the main liquid inlet 111 and the main liquid outlet 112, and the main valve core assembly 4 includes a valve sleeve 43 sealed and fixed in the main valve installation cavity 14. The bottom of the valve sleeve 43 forms a valve liquid inlet hole connected with the main liquid inlet 111. The cross-section of the valve liquid inlet hole is a conical structure with a narrow bottom and a wide top, which is convenient for sealing with the main valve core 44 to seal the valve liquid inlet hole. The outer circle below the side wall of the valve sleeve 43 has a valve liquid outlet hole connected with the main liquid outlet 112. There are several valve liquid outlets, which are spaced axially around them. The main valve core 44 is guided and assembled in the valve sleeve 43, and cooperates with the bottom side wall of the valve sleeve 43 to seal the main liquid pipeline. The main end plug 41 is sealed above the valve core in the main valve installation cavity 14. The main end plug 41 is threadedly sealed and assembled with the main valve installation cavity 14, and the main reset spring 42 is top-mounted between the main end plug 41 and the main valve core 44; the valve sleeve 43 is provided with a main connecting hole 48 connecting the second pilot liquid circuit 13 and the main pilot liquid control cavity 47, and the main connecting hole 48 is connected to the above-mentioned pilot hole 133. In order to facilitate the emulsion in the liquid inlet hole of the valve sleeve 43 to enter the main pilot hydraulic control chamber 47, a self-control hole 46 extending upward and downward is opened at the axial position of the valve core, and the lower end of the self-control hole 46 is blocked by a damping plug 45. The damping plug 45 is provided with a tiny hole connected to the self-control hole 46. The self-control hole 46 and the damping plug 45 constitute the above-mentioned self-control flow channel. Through the arrangement of the self-control hole 46 and the damping plug 45, the emulsion in the liquid inlet hole can enter the pilot hydraulic control chamber through the self-control flow channel, and the emulsion can form a pressure difference to quickly enter the main pilot hydraulic control chamber 47 to realize the subsequent cut-off control of the main valve core 44.

[0062] During actual operation, the main valve core 44 is pushed upward by the emulsion, overcoming the elastic force of the main reset spring 42 and pushing the main valve core 44 upward to realize the conduction of the main liquid circuit 11. When the second pilot liquid circuit 13 is controlled to be closed, the emulsion enters the main pilot liquid control chamber 47 through the self-controlled flow channel. Since the cross-sectional area of one side of the pilot liquid hole cavity is larger than the cross-sectional area at the valve inlet orifice, under equal pressure conditions, the pressure at the upper end of the valve core is greater than the pressure at the lower end, and the valve core is pressed downward at the valve inlet orifice, thereby blocking the main liquid outlet 112.

[0063] The bypass valve core assembly 5 includes a bypass valve core 53 movably assembled in the bypass return valve installation cavity 15. The bypass valve core 53 is opened by the upward push of the emulsion below. The bottom of the bypass valve core 53 has a sealing end face that is sealed with the main liquid path 11. The top of the bypass valve core 53 is provided with a accommodating cavity 55. The top of the bypass valve core 53 is open. A screw plug 54 is provided above the bypass valve core 53 as a sealing plug. The side wall of the bypass valve core 53 is provided with a liquid control hole 56 that passes through the accommodating cavity 55 and the bypass liquid return port 113. The liquid control hole 56 is for reflux liquid to enter the accommodating cavity 55 to drive the bypass valve core 53 to block the main liquid path 11 downward to prevent the liquid in the downstream main liquid return pipeline system from flowing back to the main channel 115 of the main liquid path 11.

[0064] Specifically, a plug 54 is threadedly sealed at the top of the bypass return valve installation cavity 15. A bypass valve core 53 is arranged in a vertically guiding manner below the plug 54. The bottom of the bypass valve core 53 is open. A fixing screw 51 is threadedly plugged and fixed at the bottom of the bypass valve core 53. A valve gasket 52 is provided between the fixing screw 51 and the bypass valve core 53. The hydraulic control hole 56 is opened on the side wall of the bottom of the bypass valve core 53 near the fixing screw 51.

[0065] During actual operation, when the main valve core assembly 4 closes the main liquid outlet 112, the emulsion liquid surges upward through the main channel 115 into the bypass return valve installation cavity 15, and upwardly pushes open the bypass valve core 53 to open the bypass return liquid port 113. The emulsion liquid flows into the downstream main pipeline system through the bypass return liquid port 113 in a short circuit and no longer enters the liquid tank body. The designed accommodating cavity 55 and the structure of the hydraulic control hole 56 are mainly designed to prevent the emulsion liquid in the downstream main return liquid pipeline system from flowing back to the valve block 1 through the bypass return liquid pipeline. Specifically, when the back pressure of the emulsion liquid in the main return liquid pipeline system connected to the bypass return liquid pipeline system is too high, it will flow back into the bypass return valve installation cavity 15 along the bypass return liquid pipeline. The liquid flowing back through this part enters the accommodating cavity 55 through the hydraulic control hole 56. Due to the area difference of the bypass valve core 53 being larger at the top and smaller at the bottom, the pressure above is greater than the pressure below. The bypass valve core 53 always has a tendency to downwardly block the main channel 115, ensuring effective sealing between the bypass valve core 53 and the valve gasket 52 and the valve block 1, and preventing the emulsion liquid in the downstream main return liquid pipeline from flowing back through the bypass return liquid pipeline.

[0066] The manual hydraulic control pilot valve assembly 6 includes a pilot valve core 62 movably arranged on the second pilot liquid path 13. In order to achieve manual control of the pilot valve core 62, a manual driving structure is also provided on the valve block 1. The manual driving structure is used to abut and cooperate with the pilot valve core 62. A pilot return spring 64 is provided between the pilot valve core 62 and the valve block 1. A secondary pilot hydraulic control cavity 610 is provided between the pilot valve core 62 and the manual driving structure. The secondary pilot hydraulic control cavity 610 is communicated with the first pilot liquid path 12 to drive the pilot valve core 62 to block the second pilot liquid path 13 after liquid is introduced into it.

[0067] Specifically, the manual hydraulically controlled pilot valve assembly 6 includes a valve housing sealed and assembled in the corresponding manual hydraulically controlled pilot mounting cavity 16, the pilot valve core 62 is guided and assembled in the valve housing, the pilot return spring 64 is top-mounted between the valve housing and the pilot valve core 62, and a pilot connecting hole 611 connecting the first pilot fluid path 12 and the pilot hydraulic control cavity is provided on the side wall of the valve housing. A threaded hole is also provided on the valve housing, and the axis of the threaded hole is consistent with the axis of the pilot valve core 62. The manual drive structure includes a valve stem 68 threadedly assembled in the threaded hole, and a handwheel 69 is connected to the top of the valve stem 68. Meanwhile, the valve housing includes a pilot valve seat 61, a pilot end plug 65, a pilot pressure sleeve 63, a pilot baffle 67, etc., wherein the pilot valve seat 61 is arranged separately from other structures and sealed and fixed at the bottom of the manual hydraulic pilot installation chamber 16, and has a valve port on it which is sealed and assembled with the pilot valve core 62. The pilot valve core 62 is inserted into the valve port to separate the manual hydraulic pilot installation chamber 16 from the second longitudinal channel 131. The pilot end plug 65 and the pilot pressure sleeve 63 are inserted into each other, and the pilot valve core 62 is guided and inserted therein, and the pilot communication hole 611 is arranged on the side of the pilot end plug 65, and the space between the inner end surface of the pilot end plug 65 and the top end surface of the pilot valve core 62 constitutes the pilot hydraulic control chamber.

[0068] The lower end of the valve stem 68 is inserted into the pilot end plug 65, and the lower end head forms a sliding seal with the pilot end plug 65. The middle part is connected with the internal thread of the pilot end plug 65. A square is set at one end of the upper side of the valve stem 68 to cooperate with the square hole of the hand wheel 69. The upper end is limited by a nut. The hand wheel 69 drives the valve stem 68 to rotate together, rotate inside the pilot end plug 65 and move axially up and down. The upper side of the pilot valve core 62 is inserted into the lower part of the pilot end plug 65, and the pilot reset spring 64 is installed between the two. The lower side of the pilot end plug 65 is connected with the pilot end plug 65 through a pilot pressure sleeve 63 to limit and fix the pilot reset spring 64. The middle of the pilot pressure sleeve 63 is provided with a light hole to contact the pilot valve core 62 forms a sliding seal, the maximum outer circle of the pilot end plug 65 is connected to the inside of the valve block 1, and is limited on the valve block 1 by the baffle 67 and the screw 66. When working, turn the hand wheel 69, the hand wheel 69 drives the release spiral to rotate, the valve stem 68 moves axially downward, and pushes the pilot valve core 62 below to move downward, forming a seal with the pilot valve seat 61 below, closing the manual hydraulic pilot installation cavity 16 and the second pilot liquid circuit 13. When not working, turn the hand wheel 69 in the opposite direction, the hand wheel 69 drives the valve stem 68 to move spirally upward, and disengages from the pilot valve core 62. Under the action of the pilot return spring 64 pad, the pilot valve core 62 disengages from the pilot valve seat 61 and no longer forms a seal.

[0069] In actual use, the high-pressure pilot fluid in the first pilot fluid path 12 enters the pilot fluid control chamber through the pilot inlet 121, and pushes the pilot valve core 62 downward to extend and insert into the pilot valve seat 61, thereby cutting off the second pilot fluid path 13. When there is no high-pressure pilot fluid in the first pilot fluid path 12, the pilot return spring 64 resets and pulls the pilot valve core 62 back upward, and the second pilot fluid path 13 can be opened.

[0070] The electromagnetic pilot valve assembly 2 is installed on the top of the valve block 1 and fixed to the valve block 1 by screws. The electromagnetic pilot valve assembly 2 is mainly used to control the opening and closing of the pilot fluid from the electromagnetic pilot valve inlet to the electromagnetic pilot fluid control port 128.

[0071] A sealing plate 9 is welded to the right side of the above-mentioned valve block 1. The whole is welded to the installation opening on the side wall of the liquid tank body through this sealing plate 9. Specifically, a hole is opened in the side wall of the liquid tank body, and then the sealing plate 9 is welded to the installation opening. The floating ball pilot valve assembly 3 is installed inside the liquid tank body, the valve block 1 and other series of valve assemblies are installed outside the liquid tank body. The main inlet 111 on the valve block 1 is arranged outside the liquid tank body, the main outlet 112 is arranged inside the liquid tank body, and the bypass return port 113 is placed inside the liquid tank body and reaches the outer side surface on the right side of the liquid through a welded steel pipe 101 passing through the liquid tank body, and then is connected to the downstream main return pipeline system.

[0072] The above-mentioned second pilot fluid path 13 constitutes the auxiliary pilot fluid path of this application, the outlet of the second pilot fluid path 13 constitutes the pilot outlet of this application, the above-mentioned self-control hole 46 and the damping plug 45 constitute the self-control flow path of this application, and the above-mentioned main pilot fluid control chamber 47 constitutes the pilot fluid control chamber of this application; when applied to a floating ball pilot type liquid control stop valve, only the main fluid path 11, the second pilot fluid path 13, the main valve core assembly 4, the floating ball pilot valve assembly 3, etc. on the valve block 1 can be used, and other first pilot fluid paths 12, electromagnetic pilot valve assemblies, manual fluid control pilot valve assemblies, etc. can all be in a closed state.

[0073] Of course, in other embodiments, only one main fluid path, one auxiliary pilot fluid path, a main valve core assembly and a floating ball pilot valve assembly can be arranged on the valve body to realize the on-off control of the auxiliary pilot fluid path by using the floating ball pilot valve assembly, and further control the channel of the main valve core assembly to realize the opening and closing control of the stop valve.

[0074] The above-mentioned floating ball pilot valve assembly 3 is arranged on the second pilot hydraulic circuit 13. When the second pilot hydraulic circuit 13 is blocked by the floating ball pilot valve assembly 3, the liquid in the main hydraulic circuit 11 enters the main pilot hydraulic control chamber 47 through the self-control flow path. The pressure on the side of the main spool 44 close to the main hydraulic circuit 11 is less than the pressure on the side of the main pilot hydraulic control chamber 47, causing the main spool 44 to move and block the main hydraulic circuit. When the second pilot hydraulic circuit 13 is unobstructed, the liquid in the main hydraulic circuit 11 enters the main pilot hydraulic control chamber 47 through the self-control flow path and is discharged through the pilot outlet 134.

[0075] Specifically, in order to realize the control of the second pilot hydraulic circuit 13 by the floating ball pilot valve assembly 3, the floating ball pilot valve assembly 3 includes a hinge rod 32 rotatably suspended on the valve block 1. A floating ball 31 is connected to the end of the hinge rod 32, and a pilot valve rod 33 for blocking the second pilot hydraulic circuit 13 is connected to the head of the hinge rod 32. The movement of the floating ball 31 drives the hinge rod 32 to rotate, thereby driving the pilot valve rod 33 to block and open the second pilot hydraulic circuit 13.

[0076] Preferably, in order to facilitate the opening and closing control of the second pilot hydraulic circuit 13, the pilot valve rod is movably arranged at the pilot outlet.

[0077] In order to meet the opening and closing control of the floating ball pilot valve at the pilot outlet 134, a pilot valve sleeve 35 is connected to the pilot outlet 134. The axis of the pilot valve sleeve 35 is consistent with the axis of the pilot outlet 134. The inner end of the pilot valve rod 33 is guided and inserted into the pilot valve sleeve 35. A drain port 352 communicating with the pilot outlet 134 is provided on the side wall of the pilot valve sleeve 35. The pilot valve sleeve 35 is also provided with an anti-detachment structure for axially limiting and anti-detaching cooperation with the pilot valve rod 33 along the pilot valve sleeve 35. The outer end of the hinge rod has a matching portion for abutting against the tail end of the pilot valve rod.

[0078] Preferably, in order to achieve the anti-detachment design, the anti-detachment structure includes a limiting step 351 provided on the inner side wall of the pilot valve sleeve 35. The limiting step 351 is located outside the drain port 352. A ring platform 331 is provided on the outer peripheral surface of the inner end of the pilot valve rod 33. When the pilot valve rod 33 moves outward, the anti-detachment is achieved through the cooperation of the ring platform 331 and the limiting step 351, and at the same time, the drain port 352 is opened for drainage.

[0079] In order to realize the stable transmission between the hinge rod and the check valve rod, the matching portion is composed of an elbow arm 36 fixedly connected to the tail end of the hinge rod. When the hinge rod 32 swings, it drives the elbow arm 36 to rotate, and then the tail end of the elbow arm 36 abuts against the pilot valve rod 33.

[0080] Preferably, in order to ensure the plugging and sealing performance of the pilot valve rod 33, a support 34 is installed on the side wall of the sealing plate 9 on the valve block 1. The articulated rod is rotatably assembled on the support 34. A sealing gasket sleeve 37 is coaxially provided on the support 34 corresponding to the inner end position of the pilot valve sleeve 35. The outer diameter of the pilot valve rod 33 is larger than the inner diameter of the sealing gasket sleeve 37 so that the pilot valve rod abuts against the sealing gasket sleeve 37 to achieve the plugging of the auxiliary pilot liquid path.

[0081] During the actual working process of the floating ball pilot-operated hydraulic control check valve, most of the liquid in the main liquid path can be discharged from the liquid outlet independently during the normal process, and a small part of the liquid enters the second pilot liquid path 13 through an extremely thin self-control flow channel and is discharged outwards through the pilot outlet 134. During the process of opening the main liquid path 11 of the check valve, the existing normal circulation can be satisfied; when the liquid level in the liquid tank gradually rises to a certain height, the floating ball pilot valve assembly controls the opening and closing of the second pilot liquid path 13. At this time, the main pilot hydraulic control cavity 47 is closed, and the liquid entering the main 47 pilot hydraulic control cavity through the self-control flow channel is filled. Since the liquid pressure is the same everywhere in the main channel and the main pilot hydraulic control cavity 47, and the plugging cross-sectional areas at the upper and lower ends of the main spool 44 are different, the forces at both ends are different. At this time, the high-pressure liquid in the main pilot hydraulic control cavity 47 pushes the main spool 44 downward until the main liquid path is closed, so that the entire check valve can be closed.

[0082] Of course, in other embodiments, a corresponding floating ball pilot valve installation cavity can also be opened on the valve block 1, so that the floating ball pilot valve installation cavity communicates with any part in the middle of the second pilot liquid path 13, and the corresponding pilot valve rod is guided and inserted into the floating ball pilot valve installation cavity, and the on-off control of the second pilot liquid path is realized through the push-pull action.

[0083] Of course, in other embodiments, the pilot valve rod can also be directly guided and inserted into the pilot outlet of the valve block 1, and a side through hole is opened on the valve block. By opening and closing the reciprocating movement of the pilot valve rod, the communication between the side through hole and the pilot outlet is realized, and then the opening and closing control of the pilot outlet is realized.

[0084] Of course, in other embodiments, the anti-disconnection structure can also be realized by a compression spring or a pull rope arranged between the pilot valve sleeve 35 and the pilot valve rod.

[0085] In other embodiments, the mating part can directly adopt a long hole opened on the articulated rod, and the outer end of the pilot valve rod is slidably assembled in the long hole to realize the horizontal reciprocating movement of the pilot valve rod during the rotation process.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Any equivalent replacement of the present invention and any modification or partial replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. Float ball pilot-operated liquid control globe valve, characterized in that It includes a valve body, on which there are a main liquid path and an auxiliary pilot liquid path; the main liquid path has a main liquid inlet and a main liquid outlet, and the auxiliary pilot liquid path has a pilot liquid outlet for discharging the pilot liquid; On the main liquid path, there is a main spool assembly, and on the auxiliary pilot liquid path, there is a float pilot valve assembly for controlling the on / off of the auxiliary pilot liquid path; The valve body also has a main valve installation cavity connecting the main liquid path and the auxiliary pilot liquid path. The main spool assembly includes a main spool that reciprocates to block the main liquid path. Between the main spool and the valve body, there is a main return spring. On the side of the valve body and the main spool facing away from the main liquid path, there is a pilot liquid control cavity, which is connected to the auxiliary pilot liquid path. On the main spool, there is also a self-control flow channel that penetrates the main liquid path and the pilot liquid control cavity; the cross-sectional area of the blocking section on the side of the main spool close to the main liquid path is smaller than that on the side close to the pilot liquid control cavity; When the auxiliary pilot liquid path is blocked by the float pilot valve assembly, the liquid in the main liquid path enters the pilot liquid control cavity through the self-control flow channel. The pressure on the side of the main spool close to the main liquid path is less than that on the side of the pilot liquid control cavity, causing the main spool to move and block the main liquid path; When the auxiliary pilot liquid path is unobstructed, the liquid in the main liquid path enters the pilot liquid control cavity through the self-control flow channel and is discharged through the pilot liquid outlet.

2. The floating ball pilot-operated hydraulic control globe valve according to claim 1, wherein, The float pilot valve assembly includes a hinged rod rotatably suspended outside the valve body. At the end of the hinged rod, there is a float connected. At the head end of the hinged rod, there is a pilot valve rod that abuts and cooperates to block the pilot liquid path and is arranged in the auxiliary pilot liquid path. The movement of the float drives the hinged rod to rotate, causing the pilot valve rod to block and open the auxiliary pilot liquid path.

3. The float pilot-operated hydraulic control globe valve according to claim 2, wherein, The pilot valve rod movably blocks at the pilot liquid outlet.

4. The floating ball pilot-operated hydraulic control globe valve according to claim 2, characterized in that At the pilot liquid outlet, there is a valve sleeve connected. The axis of the valve sleeve is the same as that of the pilot liquid outlet. The inner end of the pilot valve rod is guided and inserted into the valve sleeve. On the side wall of the valve sleeve, there is a drain port that penetrates the pilot liquid outlet. On the valve sleeve, there is also an anti-detachment structure that axially limits and anti-detaches with the pilot valve rod. The outer end of the hinged rod has a cooperation part for abutting against the tail end of the pilot valve rod.

5. The floating ball pilot-operated hydraulic control globe valve according to claim 4, characterized in that, On the side wall of the valve body, there is a support installed. The hinged rod is rotatably assembled on the support. Corresponding to the inner end position of the valve sleeve on the support, there is a sealing gasket sleeve coaxially padded. The outer diameter of the pilot valve rod is greater than the inner diameter of the sealing gasket sleeve, so that the pilot valve rod abuts against the sealing gasket sleeve to block the auxiliary pilot liquid path.

6. The float pilot-operated hydraulic control globe valve according to claim 4, characterized in that, The anti-detachment structure includes a limiting step arranged on the inner side wall of the valve sleeve. The limiting step is located outside the drain port. On the outer peripheral surface of the inner end of the pilot valve rod, there is a ring platform.

7. The floating ball pilot-operated hydraulic control globe valve according to claim 5, wherein The cooperation part is composed of an elbow arm fixedly connected to the tail end of the hinged rod.

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