A tool for enhancing the effect of the blue oil test of a small-bore swing check valve

Abstract

The utility model discloses a kind of tools for enhancing small-bore swing check valve blue oil test effect display, it is related to mechanical design manufacturing technical field, for solving the problem of existing small-bore swing check valve blue oil test effect is not good enough.The tool includes: for the tool flange for fixing tool on check valve flange, it is provided with observation port, several bolt holes and interstices;Force transmission rod passes through the interstices on tool flange, and one end is provided with knock head, and the other side of the other end has bevel;The bevel and the bevel of valve clack connecting head one side are mutually matched and interact.In preparation for doing small-bore swing check valve blue oil test, by the tool, enough external force is applied at valve clack to increase the force between valve clack and valve seat, so that blue oil test effect is obvious, and the sealing condition of valve clack and valve seat is accurately judged by obvious blue oil test effect.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical design and manufacturing technology, specifically relating to a tool for enhancing the display of blue oil test results for small-diameter swing check valves. Background Technology

[0002] A non-return valve, also known as a check valve, back pressure valve, or one-way valve, is an automatic regulating valve that opens and closes automatically without external operation, relying solely on the force generated by the flow of the medium in the pipeline. The most commonly used type of non-return valve is the swing type. Its flat, disc-shaped valve disc rests against a valve seat within the valve body and can rotate around a pin outside the valve seat, with the direction of rotation corresponding to the fluid flow direction. The valve disc's rotation axis is located above its center of gravity. When the fluid flows in the forward direction, its thrust acts on the valve disc, keeping it open; when the fluid flows in the reverse direction, the valve disc, under its own weight and the opposing force of the fluid, falls back and rests against the valve seat, closing the valve.

[0003] The blue oil test is a method used in valve manufacturing to test the sealing performance of valves. In this test, blue dye is applied to the valve's sealing surface, pressure is applied, and the presence of blue oil leakage is observed to determine if the valve's sealing performance is up to standard. Large-diameter swing check valves, due to their large valve discs and heavy weight, can achieve good blue oil test results simply by their own weight. However, small-diameter swing check valves, due to their small valve discs and light weight, often do not achieve good blue oil test results. In this situation, testers typically use one hand to simultaneously press down on the valve disc in the same direction as it rotates and falls to increase the force between the valve disc and the valve seat and enhance the blue oil display. However, due to the small diameter and limited internal space of small-diameter swing check valves, the auxiliary force from the tester is limited. Although it has some effect, the blue oil display remains unclear, making it impossible to determine whether the sealing surface is up to standard. If a valve is judged to be qualified even though it is actually unqualified, the check valve will not be able to prevent backflow, resulting in valve failure. Utility Model Content

[0004] The purpose of this invention is to provide a tool that enhances the display of the blue oil test effect of small-diameter swing check valves, and solves the problem of poor blue oil test effect of existing small-diameter swing check valves.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a tool for enhancing the blue oil test effect display of a small-diameter swing check valve, wherein the tool includes: a tool flange for fixing the tool to the check valve flange, which is provided with an observation port, several bolt holes and a slot; a force transmission rod passes through the slot on the tool flange, one end of which is provided with a striking head, and the other end has a bevel on one side; the bevel matches and interacts with the bevel on one side of the valve disc connector.

[0006] The aforementioned tool for enhancing the blue oil test effect of a small-diameter swing check valve includes a valve disc connector that is trapezoidal in shape, with an inclined surface on one side and a circular hole on the other side for inserting a valve disc nut.

[0007] The aforementioned tool for enhancing the blue oil test effect of a small-diameter swing check valve includes a threaded hole on each of the other four sides of the valve disc connector.

[0008] The tool described above enhances the blue oil test effect of a small-diameter swing check valve, wherein the tool flange has an inter-hole located near the valve inlet side.

[0009] The aforementioned tool for enhancing the blue oil test effect of a small-diameter swing check valve includes several bolt holes on the outer side of the tool flange near its edge, for rotating the entire tool flange over a wide range to adjust its installation position.

[0010] The tool described above for enhancing the blue oil test effect of a small-diameter swing check valve, wherein the bolt hole is an oblong hole with an arc.

[0011] The aforementioned tool for enhancing the blue oil test effect of small-diameter swing check valves includes an observation port located between the flange bore and bolt hole for direct observation of the installation effect.

[0012] The aforementioned tool for enhancing the blue oil test effect of a small-diameter swing check valve preferably uses copper as the material for the striking head, as copper is a relatively soft material that reduces the impact between metals.

[0013] The aforementioned tool for enhancing the blue oil test effect of a small-diameter swing check valve includes a striking head and a force transmission rod connected and secured by an expansion joint.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a tool for enhancing the display of the blue oil test effect of small-diameter swing check valves. On the one hand, by using this tool, the blue oil test effect of small-diameter swing check valves can be clearly displayed, accurately determining whether the sealing performance between the valve disc and the valve seat of the small-diameter swing check valve is qualified; on the other hand, the blue oil test only requires tapping perpendicular to the pipeline direction, reducing the complexity of the test and improving maintenance efficiency, and reducing the human resource cost of the blue oil test process; and on the other hand, the installation effect can be directly observed through the observation port, and the valve disc connector, force transmission rod, tool flange, etc. can be accurately adjusted at any time. Attached Figure Description

[0015] Figure 1 The diagram shown is a schematic representation of the overall structure of a tool for enhancing the blue oil test effect display of a small-diameter swing check valve according to this utility model.

[0016] The labels in the diagram are as follows: 1. Valve disc connector; 2. Force transmission rod; 3. Tool flange; 4. Bolt hole; 5. Inspection port; 6. Knocking head. Detailed Implementation

[0017] To address the problem of poor blue oil test results for existing small-diameter swing check valves, this utility model provides a tool to enhance the display of blue oil test results for small-diameter swing check valves. For example... Figure 1 As shown, the tool includes: a tool flange 3 for fixing the tool to the check valve flange, which has an observation port 5, several bolt holes 4 and a slot; a force transmission rod 2 passes through the slot on the tool flange 3, with a striking head 6 at one end and a bevel on one side of the other end; the bevel matches and interacts with the bevel on one side of the valve disc connector 1.

[0018] The valve disc connector 1 has a trapezoidal structure with a bevel on one side and a circular hole on the other side for inserting a valve disc nut. This nut connects and tightens the valve disc to the swing arm, typically followed by spot welding. The other four sides of the valve disc connector 1 each have a threaded hole. After the valve disc connector 1 is inserted into the valve disc nut, all four nuts are screwed into the threaded holes until the valve disc connector 1 and valve disc nut are securely fastened and no longer move relative to each other. The bevel at one end of the force transmission rod 2 interacts with the bevel of the valve disc connector 1, converting the vertical striking force into a lateral force perpendicular to the valve disc.

[0019] Tool flange 3 is used to connect and secure tools to the flange of the check valve. Since the valve disc of a swing check valve is not normally positioned in the center of the valve body flange, but generally near the valve inlet side, the orifice of tool flange 3 is also relatively close to the valve inlet side. This orifice is used for the force transmission rod 2 to pass through tool flange 3. The position of the orifice of tool flange 3 is determined based on the actual situation. After the flange connector is installed, its position is in the middle of the valve flange; therefore, the orifice of tool flange 3 should be in the middle of tool flange 3.

[0020] The tool flange 3 is a disc structure with several bolt holes 4 near its outer edge. These bolt holes 4 are curved, waist-shaped holes. They are used to rotate the entire tool flange 3 to adjust its installation position. The bolts are used to fix the tool flange 3 to the flange of the swing check valve through the bolt holes 4. The tool flange 3 is also provided with an observation port 5, which is located between the hole and the bolt holes (4) of the tool flange 3. This is used to visually observe the installation effect and to make accurate adjustments to the valve disc connector 1, force transmission rod 2, tool flange 3, etc. at any time.

[0021] The striking head 6 is preferably made of copper. Compared to other metal parts of the tool in this design, the striking head is relatively soft, which reduces the impact of metal-to-metal contact, buffers excessive force, and effectively protects the check valve, including its components, seals, and the tool itself. During use, the copper material at the point of action can be replaced as needed. The copper striking head 6 and the force transmission rod 2 can be connected and secured via an expansion joint.

[0022] Example 1:

[0023] Insert the left circular part of valve disc connector 1 all the way into the valve disc nut. The upper surface of valve disc connector 1 is perpendicular to the swing arm of the check valve. Take four nuts and screw them into the upper, lower, left, and right threaded holes of valve disc connector 1 until the valve disc connector and valve disc nut are tightened and no longer move relative to each other.

[0024] Clean the valve seat and valve core sealing surfaces of the check valve, and apply a layer of blue oil evenly to the sealing surfaces. Install the valve disc assembly and the installed valve disc connector 1 into the swing check valve.

[0025] Install the gasket on the flange face of the check valve. Place the tool flange 3 on the installed gasket, and adjust by moving or rotating it if necessary. To facilitate observation of the contact area between the valve disc connector 1 and the force transmission rod 2, the observation port should face the inlet direction of the check valve. Tighten the tool flange 3 to the check valve flange through the bolt holes 4.

[0026] Install the striking head 6 onto the force transmission rod 2, and place the striking head 6 and the force transmission rod 2 together into the tool flange 3. Operate the direction of the force transmission rod 2 through the observation hole so that its bottom bevel is in complete contact and match with the bevel of the valve disc connector 1.

[0027] With one hand gently holding the force transmission rod 2, use the other hand to quickly tap the tapping head 6 with a tapping tool. Remove the entire assembly of the tapping head 6, force transmission rod 2, tool flange 3, gasket, valve disc assembly, and the installed valve disc connector 1 in sequence. Check the blue oil test results. If the test results do not meet the requirements, grind the valve seat and valve disc sealing surfaces. After grinding, repeat the above steps until the blue oil test is passed. If the blue oil test meets the requirements, remove and organize the special tools for this case, clean the sealing surfaces of the valve disc and valve seat, and reinstall the check valve.

[0028] Tools for enhancing the blue oil test effect of small-diameter swing check valves are available in various specifications and sizes, including tool flanges 3 of different specifications and sizes, the opening positions of tool flanges 3, valve disc connectors 1 of different specifications and sizes, force transmission rods 2, striking heads 3, observation ports 5, and opening structures, etc., to enhance the blue oil test effect of different small-diameter swing check valves.

[0029] It should be noted that the combination of the technical features in the embodiments of this utility model is not limited to the combination methods recorded in the embodiments of this utility model or the combination methods recorded in specific embodiments. All technical features recorded in this utility model can be freely combined or combined in any way, unless there is a contradiction between them.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications or equivalent substitutions made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tool for enhancing the blue oil test effect display of small-diameter swing check valves, characterized in that, The tool includes: a tool flange (3) for fixing the tool to the check valve flange, which has an observation port (5), several bolt holes (4) and a bore; a force transmission rod (2) passes through the bore on the tool flange (3), one end of which is provided with a striking head (6), and the other end has a bevel on one side; the bevel matches and interacts with the bevel on one side of the valve disc connector (1).

2. The tool for enhancing the blue oil test effect display of a small-diameter swing check valve according to claim 1, characterized in that, The valve disc connector (1) is a trapezoidal body with an inclined surface on one side and a circular hole on the other side for inserting the valve disc nut.

3. The tool for enhancing the blue oil test effect display of a small-diameter swing check valve according to claim 2, characterized in that, The valve disc connector (1) has a threaded hole on each of its other four sides.

4. The tool for enhancing the blue oil test effect display of a small-diameter swing check valve according to claim 1, characterized in that, The tool flange (3) has an inlet located near the valve inlet side.

5. The tool for enhancing the blue oil test effect display of a small-diameter swing check valve according to claim 1, characterized in that, The tool flange (3) has several bolt holes (4) near the edge on the outer side, which are used to rotate the entire tool flange (3) to adjust its installation position.

6. The tool for enhancing the blue oil test effect display of a small-diameter swing check valve according to claim 5, characterized in that, The bolt hole (4) is an oblong hole with an arc.

7. The tool for enhancing the blue oil test effect display of a small-diameter swing check valve according to claim 1, characterized in that, An observation port (5) is provided between the bore and bolt hole (4) of the tool flange (3) to visually observe the installation effect.

8. The tool for enhancing the blue oil test effect display of a small-diameter swing check valve according to claim 1, characterized in that, The striking head (6) is made of copper, which is relatively soft and is used to reduce the impact between metals.

9. The tool for enhancing the blue oil test effect display of a small-diameter swing check valve according to claim 1, characterized in that, The striking head (6) and the force transmission rod (2) are connected and fastened by an expansion joint.

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