Test tool and test method for non-standard flange valve

Abstract

The invention discloses a test tool and a test method for a non-standard flange valve, relates to the field of valves, and aims to provide a test tool which is convenient to mount and reliable in high-pressure sealing for a valve using a flange joint so as to effectively reduce the predelivery test cost of the valve using the flange joint. The tool is structurally composed of a tool inner ring, a tool flange, a tool flange blanking cap, a sealing ring and a fastener, and the tool inner ring is connected with a flange connector and connected with the tool flange; the tool flange blanking cap is connected with the flange joint; the sealing ring is nested between the tool flange blanking cap and the flange joint; the fastener comprises a stud and a nut, and is connected with the tool flange blanking cap, the tool inner ring and the tool flange. The valve using the flange joint does not need to be matched with a whole set of non-standard flange, the valve predelivery test is completed through the test tool, and the test tool is convenient to install, reliable in high-pressure sealing and low in test cost.

Description

Technical Field

[0001] The invention relates to the field of valves, and in particular to a test fixture and a test method for non-standard flange valves. Background Art

[0002] High-pressure self-tightening flange is a non-standard flange specially used for pipe connection under high pressure, high temperature, high and low temperature vibration and high flushing environment. It adopts self-tightening clamp structure, such as Figure 1 As shown, it is composed of a callan body 42 and two high-pressure self-tightening flange joints 41, a sealing ring 43 is arranged between the two high-pressure self-tightening flange joints 41, one high-pressure self-tightening flange joint 41 is welded to the inlet or outlet of the valve, and the other high-pressure self-tightening flange joint is welded to the pipeline or pipe fitting. The two high-pressure self-tightening flange joints are connected through the callan body 42, and are mainly used in chemical devices in the fields of oil and natural gas where the pipeline pressure is higher than Class 1500. When the valve uses a high-pressure self-tightening flange joint to dock with the pipeline or pipe fitting, because the valve is butt-welded to one of the high-pressure self-tightening flange joints, and the other high-pressure self-tightening flange joint is connected to the pipeline or pipe fitting, when the valve body is inspected by the conventional method, it is necessary to connect the inspection equipment to the high-pressure self-tightening flange joint connected to the valve through the connecting hole, but the high-pressure self-tightening flange joint is not provided with a threaded hole, and the high-pressure self-tightening flange joint cannot be connected to the inspection equipment of the conventional inspection method, so the valve body strength test, valve seat sealing test and upper sealing test cannot be performed on the valve according to the conventional method. If a complete set of high-pressure self-tightening flanges is used for the above test, it is necessary to connect a high-pressure self-tightening flange joint to a test pipe, the test pipe is connected to conventional testing equipment, and the high-pressure self-tightening flange joint connected to the test pipe and the high-pressure self-tightening flange joint connected to the valve are connected through a callan body 42, so that the medium can be introduced into the valve body through the test pipe for testing, but there are various models of valves and the connected high-pressure self-tightening flange joints, and there are also various corresponding models of high-pressure self-tightening flange joints connected to the test pipe. The high-pressure self-tightening flange joint connected to the test pipe cannot be removed from the pipe connection when the valve is working, which is extremely costly and cannot be widely promoted. Summary of the invention

[0003] The technical problem solved by the present application is: to overcome the deficiencies of the prior art, to provide a test fixture and test method suitable for valves with non-standard flanges, which is easy to install and has reliable high-pressure sealing, to provide a safe and reliable test method, and to reduce production costs.

[0004] The technical solutions provided by this application are as follows:

[0005] A test tool for a non-standard flange valve comprises a tool inner ring, a tool flange, a tool flange plug and a fastener. One end of the flange joint is connected to the valve, the outer wall of the flange joint has a conical surface, the tool inner ring comprises two semicircular ring parts, the tool inner ring and the tool flange are sleeved on the outside of the flange joint, the tool inner ring is located on the side of the conical surface close to the valve, the tool flange is located on the side of the tool inner ring close to the valve, the inner hole diameter formed after the two semicircular ring parts are closed is smaller than the maximum diameter of the conical surface, the tool flange is provided with a mounting hole along its own axial direction, the diameter of the mounting hole is larger than the maximum size of the outer circle of the flange joint, the end of the tool flange away from the valve is provided with a mounting groove with a diameter larger than the diameter of the mounting hole, and the two semicircular ring parts are located in the mounting groove; the tool flange plug contacts the end of the flange joint away from the valve, the fastener is used to fix the tool inner ring, the tool flange and the tool flange plug to seal the tool flange plug and the end of the flange joint; an access through hole is provided at the axial position of the tool flange plug, and the access through hole is used to pass a test medium and connect a pressure measuring element.

[0006] A conical hole is provided at one end of the inner side of the semicircular ring part close to the conical surface part. The conical hole is located at the end of the inner hole formed after the two semicircular ring parts are closed. The conical hole is used to cooperate with the conical surface part of the outer wall of the flange joint.

[0007] A sealing ring is installed at the end of the tooling flange plug cover that contacts the flange joint.

[0008] The end of the tooling flange plug cover that contacts the flange joint is provided with a plurality of annular grooves, and the sealing ring is located in the annular groove.

[0009] A circular protrusion is arranged in the middle of the side where the tooling flange plug cover contacts the flange joint, and an annular groove is arranged on the surface of the circular protrusion.

[0010] The fasteners include studs and nuts. The inner ring of the tooling is provided with first through holes evenly distributed along the circumference. The bottom of the installation groove of the tooling flange is provided with second through holes evenly distributed along the circumference. The tooling flange plug cover is provided with third through holes evenly distributed along the circumference. The studs pass through the first through holes, the second through holes and the third through holes. Each stud is threaded with at least two nuts, one nut is located on the side of the tooling flange plug cover away from the flange joint, and the other nut is located on the side of the tooling flange away from the tooling flange plug cover.

[0011] The number of sealing rings is determined according to the nominal pressure and temperature of the valve.

[0012] A test method for a test fixture for a non-standard flange valve, comprising:

[0013] Put the tooling flange on the outside of the flange joint, and make the installation groove of the tooling flange face the conical surface of the outer wall of the flange joint;

[0014] Two semicircular ring parts are sleeved on the outside of the flange joint and closed to form a tooling inner ring, and the tooling inner ring is installed in the installation groove;

[0015] Insert the sealing ring into the annular groove of the tooling flange plug cover, fit the tooling flange plug cover to the end face of the flange joint, install the fasteners and apply the preset torque;

[0016] Conduct experiments.

[0017] The test includes: plugging the access hole of the tooling flange cover, connecting the valve pressure testing machine and the pressure measuring element;

[0018] Start the valve pressure testing machine, connect the test medium that meets the standard requirements, input the specified test pressure, and observe the changes in the indication of the pressure measuring element. If the pressure does not drop within the specified test time, the pressure test can be considered to be qualified. Otherwise, it is necessary to troubleshoot the problem and re-test the pressure until the test is qualified.

[0019] The present invention can achieve the following effects: valves using flange joints do not need to be equipped with a complete set of high-pressure self-tightening flanges, and the valve factory test can be completed through the test tooling. The test tooling is easy to install, has reliable high-pressure sealing, and has low test costs. The specific effects are as follows:

[0020] 1. The test fixture of the present invention cooperates with the test equipment, the pressure gauge and the tested valve to ensure the sealing effect of the flange joint and is suitable for working conditions where the nominal pressure of the valve is higher than Class 1500.

[0021] 2. When the test fixture in the present invention is combined with the valve for testing, the sealing ring is tightly attached to the flange joint and the fixture flange plug cover, and the fasteners are tightened with appropriate torque to ensure the high-pressure test effect.

[0022] 3. Each workpiece in the test tooling of the present invention is a rotating body or a rotating body divided and formed, so the processing cost is low, the processing cycle is short, and the test tooling is easy to install.

[0023] 4. The test fixture in the present invention designs the external dimensions of each part according to the nominal pressure and temperature, the specifications and quantity of the fasteners.

[0024] 5. The test fixture in the present invention uses sealing rings to achieve high-pressure sealing. The number of sealing rings needs to be reasonably selected according to the nominal pressure and temperature of the valve, and the sealing reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of a non-standard flange-high pressure self-tightening flange structure;

[0026] Figure 2 This is a schematic diagram of the assembly of the test fixture of the present invention and the valve inlet flange;

[0027] Figure 3 It is a schematic diagram of the test tool structure of the present invention;

[0028] Figure 4 It is a schematic diagram of the inner ring structure of the tooling;

[0029] Figure 5 It is a schematic diagram of the tooling flange structure;

[0030] Figure 6 This is a schematic diagram of the tooling flange plugging structure;

[0031] Figure 7 This is a schematic diagram of the valve test system;

[0032] Figure 8 This is the valve test flow chart.

[0033] In the figure: 1. inner ring of tooling; 2. tooling flange; 3. tooling flange plug cover; 4. sealing ring; 5. fastener; 5-1. stud; 5-2. bolt;

[0034] 1-1, tapered hole; 1-2, axial end surface; 1-3, outer circumferential surface; 1-4, first through hole;

[0035] 2-1, step surface; 2-2, bottom of mounting groove; 2-3, mounting surface; 2-4, second through hole;

[0036] 3-1, access through hole; 3-2, stepped surface; 3-3, annular groove; 3-4, third through hole; 3-5, lifting hole;

[0037] 41. High-pressure self-tightening flange joint; 42. Callan body; 43. Sealing ring;

[0038] 01. Test tooling;

[0039] 6. Tested valve; 61. Flange joint. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] The present application embodiment discloses a test fixture for a valve with a non-standard flange. The test fixture 01 is applied to a tested valve 6. The tested valve 6 has two flange joints 61, such as Figure 2 and Figure 3As shown, the present invention is structurally composed of a tooling inner ring 1, a tooling flange 2, a tooling flange plug cover 3, a sealing ring 4 and a fastener 5. The tooling inner ring 1 is connected to the flange joint 61 and to the tooling flange 2; the tooling flange plug cover 3 is connected to the flange joint 61; the sealing ring 4 is nested between the tooling flange plug cover 3 and the flange joint 61; the fastener 5 includes a stud 5-1 and a nut 5-2, connecting the tooling flange plug cover 3, the tooling inner ring 1 and the tooling flange 2.

[0042] like Figure 4 As shown, the tooling inner ring 1 is composed of two semicircular ring parts, and a 45° conical hole 1-1 is provided on the inner side of the semicircular ring part, which is used to cooperate with the 45° conical portion of the outer wall of the flange joint 61; along the axial direction of the flange joint 61, the surface of the 45° conical portion is inclined toward the valve body; the axial end face 1-2 and the outer circumferential face 1-3 on one side of the semicircular ring cooperate with the tooling flange 2; the tooling inner ring 1 is provided with uniformly distributed first through holes 1-4 along the circumferential direction, which are used to install stud fasteners 5-1 to ensure reliable connection between the test tooling and the tested valve.

[0043] like Figure 5 As shown, the tooling flange 2 is a circular ring-shaped part. The tooling flange 2 is provided with a mounting hole along its own axial direction. The diameter of the mounting hole is larger than the maximum size of the outer circle of the flange joint 61. The tooling flange 2 is sleeved on the outside of the flange joint 61. The end of the tooling flange 2 facing the tooling flange plug 3 is provided with a mounting groove with a diameter larger than the diameter of the mounting hole, so that a stepped hole is formed at the end of the tooling flange 2, forming a large inner diameter end and a small inner diameter end, and a step surface 2-2 is formed between the bottom 2-2 of the mounting groove and the end surface of the tooling flange 2. 1, the tooling inner ring 1 is inserted into the installation groove, that is, the step surface 2-1 and the bottom 2-2 of the installation groove are matched with the tooling inner ring 1; the end surface of the tooling flange 2 away from the tooling flange plug cover 3 is the installation surface 2-3, and the nut fastener 5-2 is located at the end of the installation surface 2-3 away from the tooling flange plug cover 3; the bottom of the installation groove of the tooling flange 2 is circumferentially provided with uniformly distributed second through holes 2-4, and the second through holes 2-4 penetrate the tooling flange 2 along the axial direction of the tooling flange 2 for installing the stud fasteners 5.

[0044] like Figure 6As shown, the tooling flange plug cover 3 is a cylindrical part. When it is necessary to pass the test medium and connect the pressure measuring element, a small-diameter access hole 3-1 is provided at the axial position of the tooling flange plug cover 3 for passing the test medium and connecting the pressure measuring element; a circular protrusion is provided in the middle of the side of the tooling flange plug cover 3 in contact with the flange joint 61, and the part of the end face of the tooling flange plug cover 3 outside the circular protrusion is a stepped surface 3-2 to reduce the processing amount of the end face of the circular protrusion, and a plurality of annular grooves 3-3 are provided at the edge position of the circular protrusion for installing the sealing ring 4; the tooling flange plug cover 3 is provided with evenly distributed third through holes 3-4 along the circumferential direction, and the third through holes 3-4 are used to install the stud fasteners 5-1; the end face of the tooling flange plug cover 3 away from the flange joint 61 is installed with a nut fastener 5-2, and the nut fastener 5-2 is threadedly connected to the stud fastener 5-1; the circumferential end face is provided with a lifting hole 3-5 for facilitating the installation of the plug cover.

[0045] The thickness of the tooling inner ring 1, the tooling flange 2 and the tooling flange plug cover 3 needs to be reasonably selected according to the design pressure and design temperature of the valve, and the external dimensions of each part are designed in combination with the specifications and quantity of the fasteners 5.

[0046] The sealing ring 4 is installed between the end face of the flange joint 61 and the annular groove 3-3 of the tooling flange plug cover to ensure the high-pressure sealing of the test tooling; the number of sealing rings 4 needs to be reasonably selected according to the design pressure and design temperature of the valve. When the valve design pressure is lower than Class 2500, two sealing rings 4 are used, and when it is higher than Class 2500, three sealing rings 4 are used, and the sealing reliability is high.

[0047] In the fastener 5, the stud 5-1 passes through the tooling flange cover 3, the tooling inner ring 1 and the tooling flange 2 respectively, and is fastened by the nut 5-2 to achieve a tight connection between the test tooling and the valve, thereby ensuring the high-pressure seal of the test tooling; the specifications, materials and quantity of the fasteners need to be reasonably selected according to the design pressure of the valve to ensure that the stress on the fastener 5 meets the material requirements.

[0048] The installation method of the test tooling is as follows: first, nest the tooling flange 2 in the side of the flange joint 61 close to the valve body, then nest the two tooling inner rings 1 in combination between the tooling flange 2 and the flange joint 61, embed the sealing ring 4 into the annular groove 3-3 of the tooling flange plug cover 3, and then fit the whole to the end face of the flange joint 61, install the fastener 5 and apply appropriate torque to ensure the overall sealing effect of the test tooling.

[0049] like Figure 7 and Figure 8As shown, the method and process of using the test fixture are as follows: first install the test fixture on the inlet and outlet sides of the valve, and connect the valve pressure testing machine and pressure gauge and other pressure measuring elements on the inlet side; start the valve pressure testing machine, input the specified test pressure, and observe the changes in the indication of the pressure measuring element. If the pressure does not drop within the specified test time, the pressure test can be considered to be qualified. Otherwise, it is necessary to troubleshoot the problem and re-test the pressure until the test is qualified.

[0050] The specific method and process of using the test tooling are as follows:

[0051] (1) After the valve to be tested is assembled, test fixtures of corresponding sizes shall be installed on the inlet and outlet sides of the valve as required; the inlet side shall be connected to the valve pressure testing machine, test pipeline, pressure gauge and other pressure measuring elements, and the pressure measuring elements shall be installed as close to the inlet as possible to improve the accuracy of the pressure measurement results; when conducting valve body strength test and upper sealing test, the test fixture shall be installed on the outlet side.

[0052] (2) The pressure testing machine is powered on and started, and the test medium (air, clean water, etc.) that meets the requirements of relevant standards is connected, and the test pressure is set for the valve to be tested; the test pressure can be determined according to the relevant valve standards and the design pressure level of the valve to be tested or can be separately negotiated.

[0053] (3) If the test medium is liquid, the exhaust valve should be opened first to exhaust the air inside the valve cavity to ensure that the actual hydraulic pressure meets the test pressure. The test medium is introduced into the valve and the pressure is gradually increased in 3 to 10 stages. Each stage is kept stable for more than 10 minutes. First, pressurize to 50% of the test pressure. If there is no leakage, continue to pressurize until the pressure measuring element reaches the test pressure.

[0054] (4) Observe the change in the indication of the pressure measuring element within the specified test time. For valves that require zero leakage, if the pressure does not drop and there is no visible leakage, external leakage or damage to the valve body, the pressure test can be considered to be qualified; otherwise, the leakage point that causes the pressure drop needs to be checked, and the pressure test is repeated after the leakage point is eliminated. The relevant test tasks are completed after the test is qualified. For valves with leakage rate requirements, the pressure measuring element or leakage rate detection element should be used to determine whether the leakage rate meets the requirements.

[0055] (5) After the test is completed, the test medium should be drained. After the liquid test medium is drained, dry air should be passed in for drying.

[0056] (6) According to the size of the valve, the test time of the tested valve can be divided into 4 levels. The first level is for 2” and below; the second level is for 2.5” to 6”; the third level is for 8” to 12”; and the fourth level is for 14” and above. As the valve diameter increases, the test time increases step by step.

[0057] The experimental tooling described in the present invention can achieve the following effects: valves using flange joints 61 do not need to be equipped with a complete set of high-pressure self-tightening flanges, and the valve factory test can be completed through the experimental tooling. The experimental tooling is easy to install, has reliable high-pressure sealing, and has low test costs.

[0058] The contents not described in detail in this application specification belong to the common knowledge of those skilled in the art.

[0059] The present application is described in detail above in conjunction with specific implementation methods and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that, without departing from the spirit and scope of the present application, a variety of equivalent replacements, modifications or improvements can be made to the technical solution of the present application and its implementation methods, all of which fall within the scope of the present application. The scope of protection of the present application shall be subject to the attached claims.

Claims

1. A test fixture for non-standard flange valves, characterized by: The utility model comprises a tooling inner ring (1), a tooling flange (2), a tooling flange plug (3) and a fastener (5); one end of the flange joint (61) is connected to the valve; the outer wall of the flange joint (61) has a conical surface; the tooling inner ring (1) comprises two semicircular ring parts; the tooling inner ring (1) and the tooling flange (2) are sleeved on the outside of the flange joint (61); the tooling inner ring (1) is located on the side of the conical surface close to the valve; the tooling flange (2) is located on the side of the tooling inner ring (1) close to the valve; the inner hole diameter formed after the two semicircular ring parts are closed is smaller than the maximum diameter of the conical surface; the tooling flange (2) is provided with a mounting hole along its own axial direction; the mounting hole is The diameter is larger than the maximum size of the outer circle of the flange joint (61); the end of the tooling flange (2) away from the valve is provided with a mounting groove with a diameter larger than the diameter of the mounting hole, and two semicircular ring parts are located in the mounting groove; the tooling flange plug cover (3) is in contact with the end of the flange joint (61) away from the valve, and the fastener (5) is used to fix the tooling inner ring (1), the tooling flange (2), and the tooling flange plug cover (3) so as to seal the tooling flange plug cover (3) and the end of the flange joint (61); an access through hole (3-1) is provided at the axial position of the tooling flange plug cover (3), and the access through hole (3-1) is used to pass the test medium and connect the pressure measuring element.

2. The test fixture for non-standard flange valve according to claim 1, characterized in that: A conical hole (1-1) is provided at one end of the inner side of the semicircular ring part close to the conical surface part. The conical hole (1-1) is located at the end of the inner hole formed after the two semicircular ring parts are closed. The conical hole (1-1) is used to cooperate with the conical surface part of the outer wall of the flange joint (61).

3. The test fixture for non-standard flange valves according to claim 1, characterized in that: A sealing ring (4) is installed at the end of the tooling flange plug cover (3) that contacts the flange joint (61).

4. The test fixture for non-standard flange valves according to claim 3 is characterized in that: The end of the tooling flange plug cover (3) in contact with the flange joint (61) is provided with a plurality of annular grooves (3-3), and the sealing ring (4) is located in the annular grooves (3-3).

5. The test fixture for non-standard flange valves according to claim 4 is characterized in that: A circular protrusion is provided in the middle of the side of the tooling flange plug cover (3) that contacts the flange joint (61), and an annular groove (3-3) is provided on the surface of the circular protrusion.

6. The test fixture for non-standard flange valve according to claim 1, characterized in that: The fastener (5) comprises a stud (5-1) and a nut (5-2); the tooling inner ring (1) is provided with uniformly distributed first through holes (1-4) along the circumference; the bottom of the installation groove of the tooling flange (2) is provided with uniformly distributed second through holes (2-4) along the circumference; the tooling flange plug cover (3) is provided with uniformly distributed third through holes (3-4) along the circumference; the stud (5-1) passes through the first through hole (1-4), the second through hole (2-4) and the third through hole (3-4); each stud (5-1) is threadedly connected with at least two nuts (5-2); one nut (5-2) is located on a side of the tooling flange plug cover (3) away from the flange joint (61), and the other nut (5-2) is located on a side of the tooling flange (2) away from the tooling flange plug cover (3).

7. The test fixture for non-standard flange valve according to claim 1, characterized in that: The number of the sealing rings (4) is determined according to the nominal pressure and temperature of the valve.

8. A test method for a test fixture for a non-standard flange valve according to any one of claims 1 to 7, characterized in that: include: The tooling flange (2) is placed on the outside of the flange joint (61), and the installation groove of the tooling flange (2) is aligned with the conical portion of the outer wall of the flange joint (61); Two semicircular ring parts are sleeved on the outside of the flange joint (61) and closed to form a tooling inner ring (1), and the tooling inner ring (1) is installed in the installation groove; Insert the sealing ring (4) into the annular groove (3-3) of the tooling flange plug cover (3), fit the tooling flange plug cover (3) to the end face of the flange joint (61), install the fastener (5) and apply a preset torque; Conduct experiments.

9. The test method according to claim 8, characterized in that The test comprises: The access through hole (3-1) of the tooling flange plug cover (3) is connected to the valve pressure testing machine and the pressure measuring element; Start the valve pressure testing machine, connect the test medium that meets the standard requirements, input the specified test pressure, and observe the changes in the indication of the pressure measuring element. If the pressure does not drop within the specified test time, the pressure test can be considered to be qualified. Otherwise, it is necessary to troubleshoot the problem and re-test the pressure until the test is qualified.

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