Pipeline check valve capable of adjusting flow, opening pressure and pressure drop

Abstract

The utility model discloses a pipeline check valve capable of adjusting flow, opening pressure and pressure drop, which comprises a left valve body, a right valve body, a sealing ball and a plurality of flow adjusting sheets, the left valve body and the right valve body are connected into a whole, and the plurality of flow adjusting sheets are detachably arranged on a flow cross section between the left valve body and the right valve body. The right valve body is a conical valve body, a slope is arranged at the bottom of the right valve body, the two ends of the slope are connected with the narrow-diameter end of the right valve body and the right side face of the flow adjusting piece closest to the right respectively, and the slope inclines towards the radial inner side of the right valve body from the bottom of the narrow-diameter end of the right valve body. The sealing ball is detachably arranged on the inner side of the narrow-diameter end of the right valve body, and the narrow-diameter end of the right valve body is a medium inflow end. The check valve is simple and reliable in structure, low in cost, capable of achieving the functions of flow adjustment, opening pressure, pressure drop and the like, widely applied to various working conditions of medium flow change, low in opening pressure, small in pressure drop and suitable for media of various flows.

Description

TECHNICAL FIELD

[0001] The utility model relates to a check valve, concretely relates to a pipeline check valve with adjustable flow, opening pressure and pressure drop. BACKGROUND

[0002] Check valve refers to the valve with valve clack as the opening and closing member, which is driven by its own weight or spring force and medium pressure to block the backflow of medium, belonging to the automatic valve, also known as non-return valve, check valve, etc. The traditional check valve includes lift check valve, swing check valve, double plate check valve, axial flow check valve and inclined disc check valve, which are widely used in the pipeline of petrochemical plants.

[0003] The conventional check valve structure is fixed and cannot be adjusted, and the sealing element of the check valve is usually opened by overcoming the weight of the valve clack or the spring force, so the opening pressure and pressure drop are large.

[0004] Each type of conventional check valve has its own shortcomings.

[0005] Lift check valve: the flow passage is complex and the flow resistance is large. When the lift check valve is opened, the weight of the sealing valve clack needs to be overcome, and it is not easy to open when the medium flow is small. In actual project application, the pressure drop of the lift check valve is too large, which affects the flow of medium.

[0006] Swing check valve: when the swing check valve is fully opened, the weight of the entire valve clack needs to be overcome, and the pressure drop is large. If the medium flow is unstable, the valve clack will repeatedly hit the stop block, causing pipeline vibration and resulting in large noise in the field.

[0007] Inclined disc check valve: the structure is complex, the valve clack is easy to be stuck in the valve body, and the inclined disc check valve needs to be opened on the valve body to install the center shaft, which is easy to form a leakage point.

[0008] Double plate check valve: the spring force needs to be overcome when the double plate check valve is opened, and the flow resistance of the valve is large.

[0009] Axial flow check valve: the structure is complex and the cost is high.

[0010] In addition, the double plate check valve and the axial flow check valve both require the medium flow to meet the full opening requirement, and in the half-open state, the spring of the double plate check valve or the axial flow check valve is in a long-term motion state, which affects the service life of the spring. INVENTION CONTENTS

[0011] The utility model wants to solve the technical problem of prior art, provide a simple structure, reliable, low cost's adjustable flow and opening pressure and pressure drop's pipeline check valve, the check valve can realize adjusting flow, adjusting opening pressure and adjusting pressure drop etc.

[0012] The utility model discloses a technical scheme that solves the above technical problem: a pipeline check valve with adjustable flow and opening pressure and pressure drop, comprising a left valve body, a right valve body, a sealing ball and a plurality of flow regulating pieces, the left valve body is connected with the right valve body, the plurality of flow regulating pieces are detachably arranged on the flow passage section between the left valve body and the right valve body, a plurality of openings for medium flow are formed on each flow regulating piece, the right valve body is a conical valve body, the bottom of the right valve body has a slope, the two ends of the slope are connected with the narrow end of the right valve body and the right side of the rightmost flow regulating piece, the slope is inclined from the bottom of the narrow end of the right valve body to the inside of the right valve body, the sealing ball is detachably arranged on the inside of the narrow end of the right valve body, and the narrow end of the right valve body is a medium inflow end.

[0013] The check valve has a simple structure, is reliable, and has low cost, and its components are relatively independent, can be freely replaced, and is easy to disassemble and maintain during maintenance. By replacing the flow regulating pieces online, the flow of the pipeline medium can be adjusted; by disassembling the check valve and replacing the sealing ball with different diameters, the opening pressure and pressure drop of the check valve can be adjusted. The whole replacement process is simple.

[0014] The right valve body of the check valve has a conical valve body with a slope at the bottom, so that the entire weight of the sealing ball does not need to be completely overcome when the check valve is opened, the opening pressure is low, the pressure drop is small, and the medium can easily push the sealing ball out of the way and flow into the check valve.

[0015] As a preferred embodiment, the plurality of flow regulating pieces are sealingly inserted into the joint between the left valve body and the right valve body, and the two adjacent flow regulating pieces are arranged in parallel, and the plurality of flow regulating pieces are locked together by a bolt pair.

[0016] Further, the hole diameters of the openings on the same flow regulating piece are the same, and the number and hole diameters of the openings on different flow regulating pieces are different. The number and hole diameters of the openings on different flow regulating pieces are designed based on existing fluid mechanics technology, so as to achieve the purpose of adjusting the flow of the pipeline medium. Similarly, the diameter of the sealing ball is designed based on existing technology, so as to achieve the adjustment of the opening pressure and pressure drop of the check valve.

[0017] As preferred, the slope of the slope is 5°-30°. The slope of 5°-30° design, that is, to ensure that the check valve smaller opening pressure and pressure drop, to ensure the use of effect.

[0018] As preferred, the narrow end of the right valve body is sealingly connected with a valve seat, and the valve seat and the left valve body are connected with pipelines respectively.

[0019] Further, the valve seat and the left valve body are connected with pipelines through flange structures or welding structures.

[0020] As preferred, the left valve body and the right valve body are metal castings, metal forgings or non-metal parts, the plurality of flow regulating pieces are metal castings, metal forgings or non-metal parts consistent with the material of the left valve body and the right valve body, and the sealing ball is a metal ball or a polytetrafluoroethylene ball.

[0021] Compared with the prior art, the utility model has the advantages that the utility model discloses a check valve adopting a left-right structure valve body design, which is simple in structure, reliable and low in cost, and the components are relatively independent, can be freely replaced, and is easy to disassemble and maintain during maintenance. The utility model discloses a check valve solves the problems of fixed structure, unadjustable opening pressure, large pressure drop and unadjustable flow of a conventional check valve, and can realize the functions of adjusting flow, adjusting opening pressure and adjusting pressure drop of the check valve through a simple structure. The utility model discloses a check valve can be widely applied to various working conditions with variable medium flow, and opening of the check valve does not need to completely overcome the gravity of the entire sealing ball, so that the opening pressure is low, the pressure drop is small, and the check valve is suitable for various flow media. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure longitudinal section schematic view of the pipeline check valve in the embodiment;

[0023] Figure 2 It is Figure 1 the enlarged view of A in the middle;

[0024] Figure 3 It is the opening layout schematic of the flow regulating piece Figure 1 ;

[0025] Figure 4 It is the opening layout schematic of the flow regulating piece Figure 2 ;

[0026] Specific reference signs in the drawings are as follows:

[0027] 1-left valve body, 2-right valve body, 21-slope, 3-flow regulating piece, 31-opening, 32-bolt pair, 4-sealing ball, 5-valve seat, 6-pipeline. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Structures or components not limited in this invention employ conventional techniques in the art.

[0029] The embodiment includes a pipeline check valve with adjustable flow rate, opening pressure, and pressure drop, such as... Figure 1 As shown, the device includes a left valve body 1, a right valve body 2, a sealing ball 4, and several flow regulating plates 3. The left valve body 1 and the right valve body 2 are integrated. The flow regulating plates 3 are detachably disposed on the flow section between the left valve body 1 and the right valve body 2. Each flow regulating plate 3 has several openings 31 for the medium to flow through. The right valve body 2 is a conical valve body, and the bottom of the right valve body 2 has a ramp 21. Figure 2 As shown, the slope α of the ramp 21 is 5°. The two ends of the ramp 21 are connected to the narrow diameter end of the right valve body 2 and the right side of the flow regulating plate 3 located on the far right, respectively. The ramp 21 slopes from the bottom of the narrow diameter end of the right valve body 2 toward the radial inner side of the right valve body 2. The sealing ball 4 is detachably set inside the narrow diameter end of the right valve body 2. The narrow diameter end of the right valve body 2 is the medium inflow end.

[0030] In this embodiment, several flow regulating plates 3 are sealed and inserted at the junction of the left valve body 1 and the right valve body 2. Two adjacent flow regulating plates 3 are arranged in parallel, and the several flow regulating plates 3 are locked together by bolt pairs 32. The openings 31 on the same flow regulating plate 3 have the same diameter, while the number and diameter of the openings 31 on different flow regulating plates 3 are different. Figure 3 and Figure 4 This is a schematic diagram of the opening layout on two different flow regulating plates 3.

[0031] In this embodiment, the narrow-diameter end of the right valve body 2 is sealed with a valve seat 5, and the valve seat 5 and the left valve body 1 are connected to the pipeline 6 through a flange structure or a welded structure, respectively.

[0032] In this embodiment, the left valve body 1 and the right valve body 2 are both metal castings, metal forgings or non-metallic parts, and a number of flow regulating plates 3 are metal castings, metal forgings or non-metallic parts with the same material as the left valve body 1 and the right valve body 2. The sealing ball 4 is a metal ball or a polytetrafluoroethylene ball.

[0033] The aforementioned check valve features a left-right valve body design, which is simple, reliable, and low-cost. Its components are relatively independent and easily replaceable, facilitating disassembly and maintenance during inspection. The flow rate of the pipeline medium can be adjusted by replacing the flow regulating disc 3 online; the opening pressure and pressure drop of the check valve can be adjusted by disassembling the check valve and replacing the sealing ball 4 with one of different diameters. The entire replacement process is simple. The right valve body 2 of the aforementioned check valve adopts a conical valve body design with a 5° slope at the bottom. When opening the check valve, it is not necessary to completely overcome the weight of the entire sealing ball 4, resulting in a low opening pressure and small pressure drop, facilitating the medium to push open the sealing ball 4 and flow into the check valve.Figure 1 The medium flow direction is indicated by the middle arrow.

Claims

1. A flow rate, opening pressure and pressure drop adjustable pipe check valve, characterized by, The valve body comprises a left valve body, a right valve body, a sealing ball and a plurality of flow regulating pieces, the left valve body is connected with the right valve body, the plurality of flow regulating pieces are detachably arranged on the flow passage section between the left valve body and the right valve body, a plurality of openings for medium flow are arranged on each flow regulating piece, the right valve body is a conical valve body, the bottom of the right valve body is provided with a slope, the two ends of the slope are connected with the narrow end of the right valve body and the right side of the rightmost flow regulating piece respectively, the slope is inclined from the bottom of the narrow end of the right valve body to the inner side of the right valve body, the sealing ball is detachably arranged on the inner side of the narrow end of the right valve body, and the narrow end of the right valve body is a medium inflow end.

2. A flow rate, cracking pressure and pressure drop adjustable pipe check valve according to claim 1, characterized in that, The plurality of flow regulating pieces are sealingly inserted into the joint of the left valve body and the right valve body, and two adjacent flow regulating pieces are arranged in parallel, the plurality of flow regulating pieces are locked together by a bolt pair.

3. A flow rate, cracking pressure and pressure drop adjustable pipe check valve according to claim 2, wherein, The openings on the same flow regulating piece have the same diameter, and the number and diameter of the openings on different flow regulating pieces are different.

4. The adjustable flow and opening pressure and pressure drop pipe check valve according to claim 1, wherein, The slope of the slope is 5-30 degrees.

5. The adjustable flow and opening pressure and pressure drop pipe check valve according to claim 1, wherein, The narrow end of the right valve body is sealingly connected with a valve seat, and the valve seat and the left valve body are connected with pipelines respectively.

6. A flow rate, cracking pressure and pressure drop adjustable pipe check valve according to claim 5, wherein, The valve seat and the left valve body are connected with the pipelines by flange structures or welding structures.

7. The adjustable flow and opening pressure and pressure drop pipe check valve according to claim 1, wherein, The left valve body and the right valve body are metal castings, metal forgings or non-metal parts, the plurality of flow regulating pieces are metal castings, metal forgings or non-metal parts with the same material as the left valve body and the right valve body, and the sealing ball is a metal ball or a polytetrafluoroethylene ball.

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