Lifting type check valve and pipeline system

Abstract

The utility model discloses a lift type check valve and a pipeline system, which belong to the technical field of check valves, the lift type check valve comprises a valve body and a valve clack component, a valve cavity and a liquid inlet which are communicated with each other are arranged in the valve body, so that a fluid medium flows to required equipment through the liquid inlet and the valve cavity, and the end part of the valve cavity close to the liquid inlet is a guide hole; the valve clack assembly is arranged in the valve cavity and can linearly move in the axial direction of the valve cavity so as to connect and disconnect the liquid inlet and the valve cavity; the valve clack assembly comprises a valve clack and a guide rib located at the position close to the radial edge of the valve clack, the guide rib is arranged in the guide hole and attached to the inner wall of the guide hole so as to guide movement when the valve clack assembly moves, and the problem that the valve clack assembly inclines or tilts up when moving is solved. Therefore, the probability of leakage caused by non-uniform abrasion of the contact part of the valve clack assembly and the valve body is avoided; and the medium flow resistance can be reduced, the probability of bending deformation of the guide ribs is reduced, the interference to the medium flow state is reduced, and the stability and the uniformity during medium flowing are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to check valve technical field, especially a kind of lifting check valve and pipeline system. BACKGROUND

[0002] Check valve is a type of valve, is mainly relied on medium pressure difference to realize automatic opening and closing control valve, when the power device before valve stops working, check valve can be closed rapidly by the pressure difference force before and after valve, prevent medium backflow, protect the braking equipment before valve. Check valve is widely used in long-distance pipeline system and large-scale unit pipeline system of petrochemical engineering such as large-scale oil refining, ethylene due to its small flow resistance, stable operation, low noise, small overall size and other advantages.

[0003] Lifting check valve refers to the valve that is opened and closed automatically by the flow of medium, to prevent medium backflow, usually such valve is automatic, under the pressure of fluid flowing in one direction, valve flap opens, when fluid flows in reverse direction, valve flap is combined with valve seat by fluid pressure and self-weight of valve flap, thereby cutting off flow.

[0004] But the valve flap and valve seat (or called valve body) of the existing lifting check valve have no guiding structure, valve flap may be inclined or tilted when moving, causing uneven wear of valve seat and further causing leakage.

[0005] Therefore, how to design a lifting check valve and pipeline system to eliminate the inclination or tilting of valve flap when moving, thereby causing uneven wear of the part where valve flap contacts valve body, resulting in leakage problem is a technical problem that the skilled in the art needs to solve urgently. CONTENT OF UTILITY MODEL

[0006] The utility model aims at the defects and deficiencies in prior art, provide a kind of lifting check valve and pipeline system, to eliminate the inclination or tilting of valve flap when moving, thereby causing uneven wear of the part where valve flap contacts valve body, resulting in leakage problem.

[0007] To achieve the above object, the technical scheme adopted by the utility model is:

[0008] The utility model provides a kind of lift check valve, comprising: valve body, the inside of the valve body is mutually communicated with valve cavity and liquid inlet and is opened, to make fluid medium via the liquid inlet and the valve cavity flow to the equipment at required place, the end of the valve cavity near the liquid inlet is guide hole;Valve clack assembly, the valve clack assembly is placed in the valve cavity, and can be linearly moved along the axial direction of the valve cavity, to open and close the liquid inlet and the valve cavity;The valve clack assembly includes valve clack and the guide rib located near the radial edge portion of the valve clack, the guide rib is placed in the guide hole, and with the inner wall of the guide hole is fitted, to carry out movement guide when the valve clack assembly moves.

[0009] In an embodiment, the valve clack assembly has at least three guide ribs, which are evenly and spacedly distributed along the circumferential direction of the valve clack.

[0010] In an embodiment, the valve clack assembly further includes a guide pressing plate, a valve clack sealing ring, a guide rod, a spring and a valve seat, the guide rib is arranged on the guide pressing plate, the guide pressing plate is located at the end surface of the valve clack near the liquid inlet, and the guide pressing plate is detachably connected with the valve clack.

[0011] In an embodiment, the valve clack sealing ring is arranged between the guide pressing plate and the valve clack, the end surface of the part of the valve body for opening the guide hole is a first sealing surface, and the valve clack sealing ring is fitted with the first sealing surface to form a sealing pair.

[0012] In an embodiment, the valve clack sealing ring is arranged between the guide pressing plate and the valve clack in a detachable manner.

[0013] In an embodiment, the valve seat is internally provided with the guide hole, and the valve seat is fixedly arranged in the valve cavity in a detachable manner, and the end surface of the valve seat near the valve cavity is the first sealing surface.

[0014] In an embodiment, the guide rod is arranged at the end surface of the valve clack near the valve cavity, and the guide rod is fixedly connected with the valve clack; the inside of the valve cavity is provided with a guide frame, the guide frame is fixedly connected with the inner wall of the valve cavity in a detachable manner, the inside of the guide frame is provided with a guide rod mounting hole, one end of the guide rod away from the valve clack is arranged in the guide rod mounting hole and can be linearly moved along the axial direction of the guide rod mounting hole; the spring is sleeved on the guide rod between the valve clack and the guide frame, for assisting to close the valve clack, and enabling the medium to slowly open the valve clack by overcoming the spring force.

[0015] In an embodiment, the interior of the valve body is further provided with a backflow cavity and a communication hole for connecting the backflow cavity with the valve cavity; the lift check valve further comprises a liquid guiding valve assembly, which comprises a liquid guiding valve cover and a valve rod, the liquid guiding valve cover is detachably fixed on the valve body, the interior of the liquid guiding valve cover is provided with a valve rod mounting cavity, the valve rod is arranged in the valve rod mounting cavity and can linearly move along the axial direction of the valve rod mounting cavity, the end of the valve rod close to the communication hole can at least move to a position abutting against the end face of the communication hole close to the backflow cavity to open or block the communication hole; the end of the backflow cavity away from the valve cavity is connected with the liquid inlet to make the residual medium in the valve cavity backflow to the liquid inlet.

[0016] In an embodiment, the liquid guiding valve assembly further comprises a liquid guiding valve seat, which is detachably fixed in the communication hole, the end of the valve rod is provided with a liquid guiding valve sealing ring, the valve rod can move to a position where the liquid guiding valve sealing ring abuts against the liquid guiding valve seat, and the liquid guiding valve sealing ring and the liquid guiding valve seat tightly abut against each other to form a sealing pair.

[0017] The utility model further provides a pipeline system, including lift check valve, pump body and liquid supply pipeline, lift check valve is placed between pump body and liquid supply pipeline, and liquid inlet is connected with the liquid outlet of pump body, the outlet of valve cavity is connected with liquid supply pipeline, be used for conveying medium to liquid supply pipeline, or make the residual medium in liquid supply pipeline backflow to pump body, realize filling pump starting.

[0018] The utility model has obtained the following technical effects relative to the prior art:

[0019] 1, the utility model discloses a valve cavity is set up in the interior of valve body, the end of valve cavity close to liquid inlet is arranged as guide hole, valve clapper assembly is placed in valve cavity and can linearly move along the axial direction of valve cavity, valve clapper and guide rib are included in valve clapper assembly, guide rib is arranged at the position close to the radial edge of valve clapper, guide rib is placed in guide hole and abuts against the inner wall of guide hole to guide movement when valve clapper assembly linearly moves, thereby improve the stability of the movement direction of valve clapper assembly, solve the problem that uneven wear occurs in the part where valve clapper assembly and valve body contact when valve clapper assembly moves and causes leakage.

[0020] In addition, the guide ribs are arranged at the radial edge of the valve disc, which can reduce the resistance of the medium flow, and the force applied by the medium to the guide ribs is weakened due to the reduced resistance of the medium, and the stability of the guide ribs is greatly improved by the support of the inner wall of the guide hole, the probability of bending deformation of the guide ribs is reduced, and the service life is improved; and the interference to the flow state of the medium is also reduced, and vortex and turbulence are avoided, and the stability and uniformity of the medium flow are improved.

[0021] The other technical schemes of the utility model have the following technical effects relative to the prior art:

[0022] 2、The utility model discloses at least three guide ribs are arranged, and the at least three guide ribs are spaced apart and uniformly distributed along the circumferential direction of the valve disc, which can improve the stress uniformity of the valve disc assembly and further reduce the probability of tilting and warping of the valve disc during movement.

[0023] 3、The utility model discloses the backflow cavity and the communication hole for communicating the backflow cavity with the valve cavity are arranged in the valve body, the liquid guide valve assembly is arranged to open or close the communication hole, the on-off between the backflow cavity and the valve cavity is realized, the communication hole is closed during normal liquid supply, and the communication hole is opened when starting the pump, so that the technical effect of starting the pump without additional bypass pipeline is realized, the design and manufacturing cost are saved, the potential leakage point is reduced, and the liquid guiding time is shortened. DRAWINGS

[0024] In order to more clearly illustrate the technical schemes in the embodiments of the utility model or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 It is a structure schematic view of the lift check valve disclosed in one specific embodiment of the utility model;

[0026] Figure 2 It is an enlarged structure schematic view of I;

[0027] Figure 3 It is an enlarged structure schematic view of II;

[0028] Figure 4 It is a structure schematic view of the valve body disclosed in one specific embodiment of the utility model;

[0029] Figure 5 It is a structure schematic view of the liquid guide valve assembly (not including the liquid guide valve seat) disclosed in one specific embodiment of the utility model;

[0030] Figure 6 Structure diagram of the valve seat of the liquid guiding valve disclosed in one embodiment of the present application;

[0031] Figure 7 Structure diagram of the valve cover of the liquid guiding valve disclosed in one embodiment of the present application;

[0032] Figure 8 Structure diagram of the guiding pressure plate disclosed in one embodiment of the present application;

[0033] Figure 9 Structure diagram of the valve rod disclosed in one embodiment of the present application;

[0034] Figure 10 Structure diagram of the valve disc disclosed in one embodiment of the present application;

[0035] Figure 11 Structure diagram of the guiding frame disclosed in one embodiment of the present application;

[0036] Figure 12 Structure diagram of the valve seat disclosed in one embodiment of the present application;

[0037] Figure 13 Principle diagram of the prior art pump starting water guiding.

[0038] Wherein, 1, valve body; 2, liquid inlet hole; 3, guiding frame; 4, guiding rod mounting hole; 5, guiding rod; 6, valve cavity; 7, liquid guiding valve seat; 8, liquid guiding valve cover; 9, valve rod; 10, packing; 11, packing pressure sleeve; 12, gland nut; 13, hand wheel; 14, backflow cavity; 15, valve seat; 16, liquid inlet; 17, guiding pressure plate; 18, first nut; 19, valve disc sealing ring; 20, valve disc; 21, guiding rib; 22, spring; 23, liquid guiding valve cover sealing gasket; 24, liquid guiding valve seat sealing gasket; 25, guiding frame screw hole; 26, communication hole; 27, valve cover mounting hole; 28, valve seat screw hole; 29, second nut; 30, pressure ring; 31, liquid guiding valve sealing ring; 32, fourth external thread; 33, first internal thread; 34, valve rod mounting cavity; 35, fifth external thread; 36, second sealing surface; 37, sixth external thread; 38, third external thread; 39, mounting column; 40, second external thread; 41, guiding hole; 42, first sealing surface; 43, first external thread; 44, centrifugal pump; 45, cut-off valve; 46, check valve; 47, bypass pipeline; 48, bypass valve; 49, outlet pipeline; 50, second internal thread; 51, third internal thread. DETAILED DESCRIPTION

[0039] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by the ordinary skilled in the art without creative labor are within the protection scope of the present application.

[0040] In order to make the above-mentioned purposes, features and advantages of the present application more apparent, obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0041] As shown in the drawings, Figures 1 to 12 The present application provides a lifting check valve, comprising a valve body 1 and a valve clack assembly, the inside of the valve body 1 is provided with a valve cavity 6 and a liquid inlet 16 which are in communication with each other, so that the fluid medium flows to the required equipment through the liquid inlet 16 and the valve cavity 6, the end of the valve cavity 6 close to the liquid inlet 16 is a guide hole 41, and the guide hole 41 is formed by the inner side wall of the valve cavity 6; the valve clack assembly is placed in the valve cavity 6 and can move linearly along the axial direction of the valve cavity 6 to open and close the liquid inlet 16 and the valve cavity 6; the valve clack assembly comprises a valve clack 20 and a guide rib 21, the guide rib 21 is located close to the radial edge of the valve clack 20, the guide rib 21 is arranged in the guide hole 41 and is in close contact with the inner wall of the guide hole 41 to guide the movement of the valve clack assembly. The guide rib 21 is arranged to guide the movement of the valve clack assembly, which can reduce the possibility of uneven wear of the valve body 1 caused by tilting or lifting of the valve clack 20 during movement, thereby reducing the probability of leakage. In addition, compared with arranging the guide rib 21 in the central region of the valve clack 20, arranging the guide rib 21 close to the radial edge of the valve clack 20 can reduce the flow resistance of the liquid medium, reduce the probability of bending and deformation of the guide rib 21, and improve the stability and service life of the valve clack assembly.

[0042] The valve clack assembly has at least three guide ribs 21, which are uniformly and spacedly distributed along the circumferential direction of the valve clack 20, so as to improve the stress uniformity of the valve clack assembly and further reduce the probability of tilting and lifting of the valve clack 20 during movement.

[0043] The guide rib 21 can be arranged on the valve disc 20, or the guide rib 21 can be arranged on another component, and the component provided with the guide rib 21 is assembled with the valve disc 20 to form a valve disc assembly. In an embodiment, the valve disc assembly further comprises the guide pressing plate 17, the valve disc sealing ring 19, the guide rod 5, the spring 22 and the valve seat 15; the guide rib 21 is arranged on the guide pressing plate 17, the guide pressing plate 17 is arranged at the end face of the valve disc 20 close to the liquid inlet 16, and the guide pressing plate 17 is detachably connected with the valve disc 20; when the guide rib 21 is abraded, the guide rib 21 can be conveniently and quickly replaced by replacing the guide pressing plate 17, and the valve disc 20 does not need to be replaced, thereby reducing the replacement and maintenance cost.

[0044] In order to improve the sealing performance of the valve disc assembly, the valve disc sealing ring 19 is arranged between the guide pressing plate 17 and the valve disc 20; the end face of the part of the valve body 1 for opening the guide hole 41 is defined as the first sealing surface 42, and the first sealing surface 42 is the end face of the valve body 1 close to the valve cavity 6; and the valve disc sealing ring 19 is in contact with the first sealing surface 42 to form a sealing pair. The valve disc sealing ring 19 is arranged between the guide pressing plate 17 and the valve disc 20 in a detachable manner, so as to facilitate replacement of the valve disc sealing ring 19 and reduce the replacement and maintenance cost. The connection between the guide pressing plate 17, the valve disc sealing ring 19 and the valve disc 20 can be snap-fit connection, for example, a clamping hook is arranged on the back face of the guide pressing plate 17 (i.e. the end face of the guide pressing plate 17 away from the guide rib 21), a through hole is arranged on the valve disc sealing ring 19, and a clamping groove is arranged on the valve disc 20, so that the clamping hook is clamped in the clamping groove after passing through the through hole, thereby achieving assembly of the guide pressing plate 17, the valve disc sealing ring 19 and the valve disc 20. The connection between the guide pressing plate 17, the valve disc sealing ring 19 and the valve disc 20 can also be screw connection, for example, a mounting column 39 with external threads is arranged on one side of the valve disc 20 close to the guide hole 41, and through holes are respectively arranged on the guide pressing plate 17 and the valve disc sealing ring 19 at positions corresponding to the mounting column 39; during assembly, the valve disc sealing ring 19 and the guide pressing plate 17 are sequentially sleeved on the mounting column 39, and the valve disc sealing ring 19 is in contact with the valve disc 20 and the guide pressing plate 17 respectively, and then the first nut 18 is screwed into the external threads of the mounting column 39 and fastened, thereby completing assembly of the guide pressing plate 17, the valve disc sealing ring 19 and the valve disc 20.

[0045] If the guide hole 41 is directly arranged on the valve body 1, the entire valve body 1 needs to be replaced when the guide hole 41 is severely abraded, which is time-consuming and laborious, and the maintenance cost is high. Therefore, the guide hole 41 is arranged in the interior of the valve seat 15, and the valve seat 15 is detachably fixed to the inner wall of the valve cavity 6, and in this case, the first sealing surface 42 is specifically the end face of the valve seat 15 close to the valve cavity 6. The valve body 1 is provided with a valve seat screw hole 28, and the valve seat 15 is provided with a first external thread 43 for connecting and fixing with the valve seat screw hole 28.

[0046] The valve disc 20 is provided with a guide rod 5 near the end face of the valve cavity 6, and the guide rod 5 is fixedly connected with the valve disc 20; the valve cavity 6 is provided with a guide frame 3, and the guide frame 3 is fixedly connected with the valve cavity 6 in a detachable manner; the guide frame 3 is provided with a guide rod mounting hole 4, the free end of the guide rod 5 (i.e. the end of the guide rod 5 away from the valve disc 20) is arranged in the guide rod mounting hole 4 and can move linearly along the axial direction of the guide rod mounting hole 4; the region between the valve disc 20 and the guide frame 3 is sleeved with a spring 22, and the spring 22 is arranged to assist in closing the valve disc 20 and slowly opening the valve disc 20 by the medium overcoming the spring force, so that the lifting check valve can be installed not only on the vertical pipe but also on the horizontal pipe. The valve cavity 6 is provided with a guide frame screw hole 25, and the guide frame 3 is provided with a second external thread 40, which is connected and fixed with the guide frame screw hole 25. The guide frame 3 is further provided with a liquid inlet hole 2 for the medium to flow, and the position and number of the liquid inlet hole 2 can be adjusted according to requirements.

[0047] Before starting, the pump body (especially centrifugal pump) needs to fill the liquid in the pump body, referring to Figure 13 The existing pump filling method is as follows: a cut-off valve 45 and a check valve 46 are installed on the outlet pipeline 49 of the centrifugal pump 44, a bypass pipeline 47 is arranged, the bypass pipeline 47 is connected to both ends of the check valve 46, a bypass valve 48 is installed on the bypass pipeline 47, before starting the centrifugal pump 44, the bypass valve 48 is opened, the liquid in the outlet pipeline 49 of the centrifugal pump 44 flows into the centrifugal pump 44 and the liquid suction pipe through the bypass pipeline 47, at the same time, the air in the liquid suction pipe and the centrifugal pump 44 is discharged through the exhaust valve on the centrifugal pump 44; when the liquid is sprayed from the exhaust valve, the bypass valve 48 can be closed, and the centrifugal pump 44 is started. This pump filling method has the following defects: 1) the bypass pipeline 47, the bypass valve 48 and other components are added, which increases the manufacturing and installation cost of the pipeline; 2) the bypass pipeline 47 needs to be connected to the pipelines at both ends of the check valve 46, which increases two potential leakage points of external connection; 3) when the liquid is introduced, the liquid flows into the centrifugal pump 44 from the bypass pipeline 47, which increases the medium flow resistance and prolongs the liquid introduction time.

[0048] To solve the above technical problems, the application further has a backflow cavity 14 and a communication hole 26 for connecting the backflow cavity 14 and the valve cavity 6 in the valve body 1. The application further comprises a liquid guiding valve assembly, which comprises a liquid guiding valve cover 8 and a valve rod 9. The liquid guiding valve cover 8 is detachably fixed on the valve body 1. The liquid guiding valve cover 8 has a valve rod installation cavity 34 in the inside. The valve rod 9 is placed in the valve rod installation cavity 34 and can move linearly along the axial direction of the valve rod installation cavity 34. The end of the valve rod 9 close to the communication hole 26 can move to a position where it is in close contact with the end surface of the communication hole 26 close to the backflow cavity 14, so as to open or block the communication hole 26 and realize the connection and disconnection between the backflow cavity 14 and the valve cavity 6. The end of the backflow cavity 14 away from the valve cavity 6 is connected with the liquid inlet 16, so that the liquid in the outlet pipeline can flow back to the liquid inlet 16 through the valve cavity 6. The liquid inlet 16 is connected with the pump body. When the pump needs to be primed, the valve rod 9 is controlled to move away from the communication hole 26, so as to open the communication hole 26, connect the backflow cavity 14 and the valve cavity 6, and make the liquid in the outlet pipeline flow back to the pump body through the valve cavity 6 and the backflow cavity 14. When the pump body normally supplies liquid, the valve rod 9 is controlled to move close to the communication hole 26, so as to block the communication hole 26, disconnect the backflow cavity 14 and the valve cavity 6, and make the liquid normally flow to the outlet pipeline through the liquid inlet 16 and the valve cavity 6. The above arrangement can solve the problems of increased manufacturing and installation cost of the pipeline caused by the installation of the bypass valve and the bypass pipeline at both ends of the check valve, the problem of increasing potential leakage points caused by the increase of external connections at both ends of the check valve, and the problem of increasing medium flow resistance and prolonging liquid guiding time when the liquid flows back through the bypass pipeline.

[0049] If the end of the liquid leading valve assembly away from the communicating hole 26 does not protrude out of the valve body 1, the movement of the valve rod 9 needs to be controlled by electric power; if the end of the liquid leading valve assembly away from the communicating hole 26 protrudes out of the valve body 1, the movement of the valve rod 9 can be controlled by electric power or by hand. In an embodiment, the end of the liquid leading valve assembly away from the communicating hole 26 protrudes out of the valve body 1, i.e. the valve body 1 is provided with a valve cover mounting hole 27 on the side wall away from the communicating hole 26, the liquid leading valve cover 8 is mounted in the valve cover mounting hole 27, part of the valve rod 9 and part of the liquid leading valve cover 8 are located outside the valve body 1, the valve rod 9 is threadedly connected with the inner wall of the valve rod mounting cavity 34, i.e. the first inner thread 33 is arranged on the inner wall of the valve rod mounting cavity 34 close to the communicating hole 26, the third outer thread 38 is arranged on the valve rod 9 for connection and fixation with the first inner thread 33, the end of the valve rod 9 away from the communicating hole 26 (i.e. the end located outside the valve body 1) is provided with a hand wheel 13, rotating the hand wheel 13 makes the valve rod 9 move linearly relative to the liquid leading valve cover 8 to adjust the setting position of the valve rod 9 in the valve rod mounting cavity 34. The inner part of the valve rod mounting cavity 34 has an area without the first inner thread 33, the cavity between the area and the valve rod 9 is filled with the packing 10, the end of the liquid leading valve cover 8 is plugged with the packing sleeve 11, and the outer part of the liquid leading valve cover 8 is threadedly connected with the gland nut 12. The liquid leading valve cover 8 and the valve cover mounting hole 27 are fixedly connected in a detachable manner, wherein the second inner thread 50 is arranged in the inner part of the valve cover mounting hole 27, and the fourth outer thread 32 is arranged on the liquid leading valve cover 8 for connection and fixation with the second inner thread 50. The liquid leading valve cover 8 and the valve cover mounting hole 27 are further provided with the liquid leading valve cover gasket 23 to improve the sealing performance.

[0050] The liquid leading valve assembly further comprises a liquid leading valve seat 7 fixed in the communicating hole 26 in a detachable manner, wherein the third inner thread 51 is arranged in the inner part of the communicating hole 26, and the fifth outer thread 35 is arranged on the liquid leading valve seat 7 for connection and fixation with the third inner thread 51. The liquid leading valve seat 7 and the communicating hole 26 are further provided with the liquid leading valve seat gasket 24.

[0051] The end face of the liquid guiding valve seat 7 facing the backflow cavity 14 is a second sealing surface 36, and a liquid guiding valve sealing ring 31 is arranged at the end of the valve rod 9 and detachably fixedly connected with the valve rod 9. The valve rod 9 can move to a position where the liquid guiding valve sealing ring 31 abuts against the second sealing surface 36, and the liquid guiding valve sealing ring 31 abuts against the second sealing surface 36 tightly to form a sealing pair, thereby improving the sealing performance between the valve rod 9 and the second sealing surface 36. The end face of the liquid guiding valve sealing ring 31 abuts against the second sealing surface 36, and compared with the linear abutment mode, this abutment mode can reduce the wear of the liquid guiding valve sealing ring 31 and the liquid guiding valve seat 7, improve the sealing effect, and prolong the service life of the liquid guiding valve assembly. Moreover, the detachable connection mode facilitates replacement of the damaged liquid guiding valve seat 7 and liquid guiding valve sealing ring 31, improves the replacement efficiency, and reduces the replacement cost. The end of the valve rod 9 close to the communication hole 26 is provided with a sixth external thread 37, and the liquid guiding valve sealing ring 31 is screwed into the second nut 29 after passing through the valve rod 9, so as to fix the liquid guiding valve sealing ring 31 at the end of the valve rod 9. In an embodiment, a pressing ring 30 is further arranged between the liquid guiding valve sealing ring 31 and the second nut 29, so as to avoid crushing the liquid guiding valve sealing ring 31. When assembled, the liquid guiding valve sealing ring 31 and the pressing ring 30 pass through the valve rod 9 in sequence and are then screwed into the second nut 29.

[0052] The utility model also provides a pipeline system, including lift check valve, pump body and liquid supply pipeline, lift check valve is placed between pump body and liquid supply pipeline, and the liquid inlet 16 is linked together with the liquid outlet of pump body, and the outlet of valve cavity 6 is linked together with liquid supply pipeline, be used for conveying medium to liquid supply pipeline, or make the medium that remains in liquid supply pipeline reflux to pump body, realize filling pump starting.

[0053] It should be noted that for those skilled in the art, it is obvious that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model, and any figure mark in the claims should not be regarded as limiting the involved claims.

Claims

1. A lift-type check valve, characterized in that, include: The valve body has an interconnected valve chamber and a liquid inlet inside, so that the fluid medium can flow to the required equipment through the liquid inlet and the valve chamber. The end of the valve chamber near the liquid inlet is a guide hole. A valve disc assembly is disposed within the valve cavity and is capable of linear movement along the axial direction of the valve cavity to open or close the inlet and the valve cavity; the valve disc assembly includes a valve disc and a guide rib located near the radial edge of the valve disc, the guide rib being disposed within the guide hole and conforming to the inner wall of the guide hole to guide the movement of the valve disc assembly.

2. The lift-type check valve according to claim 1, characterized in that, The valve assembly has at least three guide ribs, which are evenly and spaced apart along the circumference of the valve.

3. The lift-type check valve according to claim 2, characterized in that, The valve disc assembly further includes a guide plate, a valve disc sealing ring, a guide rod, a spring, and a valve seat. The guide rib is disposed on the guide plate, and the guide plate is located at the end face of the valve disc near the liquid inlet. The guide plate is detachably connected to the valve disc.

4. The lift-type check valve according to claim 3, characterized in that, The valve disc sealing ring is provided between the guide plate and the valve disc. The end face of the part on the valve body used to open the guide hole is the first sealing surface. The valve disc sealing ring is fitted with the first sealing surface to form a sealing pair.

5. The lift-type check valve according to claim 4, characterized in that, The valve disc sealing ring is detachably disposed between the guide plate and the valve disc.

6. The lift-type check valve according to claim 5, characterized in that, The valve seat has a guide hole inside, and the valve seat is fixed to the inside of the valve cavity in a detachable manner. The end face of the valve seat near the valve cavity is the first sealing surface.

7. The lift-type check valve according to claim 3, characterized in that, The guide rod is disposed on the end face of the valve disc near the valve cavity, and the guide rod is fixedly connected to the valve disc; The valve cavity is provided with a guide frame inside, which is detachably fixed to the inner wall of the valve cavity. The guide frame is provided with a guide rod mounting hole inside, and the end of the guide rod away from the valve disc is placed in the guide rod mounting hole and can move linearly along the axial direction of the guide rod mounting hole. The spring is sleeved on the guide rod in the area between the valve disc and the guide frame, and is used to assist in closing the valve disc and to allow the medium to overcome the spring force and slowly open the valve disc.

8. The lift-type check valve according to any one of claims 1 to 7, characterized in that, The valve body is also provided with a reflux chamber and a connecting hole, the connecting hole being used to connect the reflux chamber and the valve chamber; The lift-type check valve also includes a liquid inlet valve assembly, which includes a liquid inlet valve cover and a valve stem. The liquid inlet valve cover is detachably fixed to the valve body. The liquid inlet valve cover has a valve stem mounting cavity inside. The valve stem is placed in the valve stem mounting cavity and can move linearly along the axial direction of the valve stem mounting cavity. The end of the valve stem near the connecting hole can move to a position that fits against the end face of the connecting hole near the reflux cavity, so as to open or block the connecting hole. The end of the reflux chamber away from the valve chamber is connected to the inlet, so that the medium remaining in the valve chamber flows back to the inlet.

9. The lift-type check valve according to claim 8, characterized in that, The liquid inlet valve assembly also includes a liquid inlet valve seat, which is detachably fixed in the communicating hole. A liquid inlet valve sealing ring is installed at the end of the valve stem. The valve stem can move to a position where the liquid inlet valve sealing ring and the liquid inlet valve seat are in contact, and the liquid inlet valve sealing ring and the liquid inlet valve seat are tightly fitted to form a sealing pair.

10. A piping system, characterized in that, The invention includes a lift-type check valve, a pump body, and a liquid supply pipeline as described in any one of claims 1 to 9. The lift-type check valve is placed between the pump body and the liquid supply pipeline, and the inlet is connected to the outlet of the pump body. The outlet of the valve chamber is connected to the liquid supply pipeline. The invention is used to transport the medium to the liquid supply pipeline or to allow the residual medium in the liquid supply pipeline to flow back to the pump body, thereby realizing the pump priming and starting.

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