Special tool for disassembling and assembling embedded throttle valve in pilot operated safety valve of nuclear power main steam valve group
By designing a special tool for disassembly and assembly for embedded throttle valves, the problem that existing tools cannot lock the adjustment screws is solved, efficient disassembly and assembly of the throttle valves and data stability are achieved, and the normal progress of the overhaul of the nuclear power plant is ensured.
Patent Information
- Application Number
- CN202420500122.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-14
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-03-14
AI Technical Summary
During the overhaul of the nuclear power plant unit, the leak of the embedded throttle valve caused the return pressure of the spring pilot safety valve to fail, affecting the thermal checking and overhaul process. Existing tools cannot lock the adjustment screws, resulting in difficulty in disassembly and assembly.
A special tool for installing embedded throttle valves is designed, including fixing handles, positioning holes and sleeve heads. The sleeve heads are matched with hexagon nuts, the positioning holes are matched with adjustment screws, and combined with a flat screwdriver, the adjustment screws can be locked and disassembled, adjusted and locked.
The tool is simple in structure, stable in work, easy to carry and disassemble, and easy to repair, greatly improving the disassembly and assembly efficiency of the throttle valve, ensuring data stability and normal progress of the overhaul process.
Smart Images
Figure CN222609495U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of throttle valve disassembly and assembly, in particular to a special tool for disassembly and assembly of an embedded throttle valve in a pilot valve of a pilot safety valve of a nuclear power main steam valve group. Background Art
[0002] During the overhaul of the nuclear power plant unit 404, when the pilot valve of the pilot safety valve of the main steam valve group was tested for the sealing performance of the spring pilot safety valve, it was found that the embedded throttle valve was leaking, which may affect the return pressure of the spring pilot safety valve, resulting in failure of the hot state calibration and affecting the normal progress of the overhaul. In the previous 7 overhauls, including the maintenance by the German manufacturer's technicians, the throttling device had never been disassembled. The adjusting screw is located inside the valve body, and the inspection hole reserved on the valve body is small, so the existing maintenance tools cannot lock the adjusting screw.
[0003] The functions of the throttle valve are as follows:
[0004] 1. The role of flow cut-off and speed regulation. The throttle valve changes the flow rate by controlling the throttling section or length. This is the main role and function of the throttle valve.
[0005] 2. Play the role of load resistance. The throttle valve can also play a load role to a certain extent, which is only part of the function of the throttle valve. The main function of the throttle valve is still throttling speed regulation.
[0006] 3. Pressure buffering: The throttle valve can buffer the fluid pressure. When the fluid flows in through the throttle valve, the throttle valve can hinder the flow of the fluid to a certain extent, thereby reducing the impact force.
[0007] The safety valve return seat pressure refers to the static pressure at the safety valve inlet when the valve disc contacts the valve seat again as the system pressure decreases after the safety valve is discharged, the valve opening height is zero, and the medium stops flowing out continuously.
[0008] In view of this, in order to solve the existing problems, a special tool for disassembling and assembling the embedded throttle valve in the pilot valve of the pilot safety valve of the main steam valve group of Tianwan Nuclear Power Plant is provided. The tool is used with a screwdriver to reach into the valve body to lock the adjusting screw without changing the position of the screw, so as to successfully complete the disassembly, adjustment and locking of the throttling device. Utility Model Content
[0009] The purpose of the utility model is to provide a special tool for disassembling and assembling an embedded throttle valve in a pilot valve of a pilot safety valve of a nuclear power main steam valve group in view of the defects of the prior art, so as to solve the problems raised by the above-mentioned background technology.
[0010] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a special tool for disassembling and assembling the embedded throttle valve in the pilot valve of the pilot safety valve of the nuclear main steam valve group, comprising a fixed handle, a positioning hole and a sleeve head, one end of the fixed handle is connected to the sleeve head, and the top of the sleeve head is provided with a positioning hole.
[0011] As a preferred technical solution of the utility model, the fixed handle and the sleeve head are integrated.
[0012] As a preferred technical solution of the utility model, the fixed handle and the sleeve head are made of metal material.
[0013] As a preferred technical solution of the utility model, the sleeve head matches the hexagonal nut of the embedded throttle valve.
[0014] As a preferred technical solution of the utility model, the positioning hole matches the adjusting screw of the embedded throttle valve.
[0015] The beneficial effects of the utility model are as follows: the device has the advantages of simple structure, stable operation, easy transportation and disassembly, easy maintenance, etc. The use of special tools for embedded throttle valves greatly improves the disassembly and assembly efficiency, and the stability of data can be controlled in a controllable manner. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a top view of the utility model;
[0017] Figure 2 It is a side view of the utility model;
[0018] Figure 3 It is a rear view of the utility model;
[0019] Figure 4 This is a schematic diagram of the structure of the embedded throttle valve of the utility model.
[0020] In the figure: fixed handle 1, positioning hole 2, socket head 3, adjustment screw 401, hexagonal nut 402, block 403. DETAILED DESCRIPTION
[0021] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.
[0022] Example: See Figure 1-4The utility model provides a technical solution: a special tool for disassembling and assembling an embedded throttle valve in a pilot valve of a pilot safety valve of a nuclear power main steam valve group, comprising a fixed handle 1, a positioning hole 2 and a sleeve head 3, one end of the fixed handle 1 is connected to the sleeve head 3, and a positioning hole 2 is provided on the top of the sleeve head 3.
[0023] The sleeve head 3 is mounted on the hexagonal nut of the embedded throttle valve to achieve a fixing effect.
[0024] The fixed handle 1 and the sleeve head 3 are integrated.
[0025] The fixed handle 1 and the sleeve head 3 are made of metal material.
[0026] The sleeve head 3 matches the hexagonal nut 402 of the embedded throttle valve.
[0027] The positioning hole 2 matches the adjusting screw 401 of the embedded throttle valve, and a flat-blade screwdriver is inserted into the positioning hole 2 to adjust the adjusting screw 401 .
[0028] Working principle: tighten the hexagonal nut 402 by hand, screw the hexagonal nut 402 into the adjustment screw 401 as much as possible; use a flat-blade screwdriver to screw the adjustment screw 401 into the block 403, then use the socket head 3 of the special tool to fix the hexagonal nut 402 and use the flat-blade screwdriver to screw back 7 turns (the number of turns is adjusted according to different embedded throttle valve data) to make the throttle valve fully open, and then use the special tool to tighten the hexagonal nut 402 to tighten the adjustment screw 401. The tool has the advantages of simple structure, stable operation, easy to carry and disassemble, easy to maintain, etc. The use of the special tool for embedded throttle valves greatly improves the efficiency of disassembly and assembly, and achieves controllable control of the stability of the data.
[0029] The tool has the advantages of simple structure, stable operation, easy handling and disassembly, and easy maintenance; the positioning hole 2 is used in conjunction with a flat-blade screwdriver to adjust the adjustment screw 401 to solve the problem that the hexagonal nut 402 rotates when the adjustment screw is directly adjusted with a flat-blade screwdriver, and the data of the adjustment screw 401 changes too much when the hexagonal nut 402 is locked; the use of an embedded throttle valve special tool greatly improves the disassembly and assembly efficiency, and achieves controllable control over the stability of the data.
[0030] The above embodiments only express the implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.
Claims
1. A special tool for disassembling and assembling an embedded throttle valve in a pilot valve of a pilot safety valve of a nuclear power main steam valve group, comprising a fixed handle (1), a positioning hole (2) and a sleeve head (3), characterized in that: One end of the fixed handle (1) is connected to a sleeve head (3), and a positioning hole (2) is provided on the top of the sleeve head (3).
2. The special tool for disassembling and assembling the embedded throttle valve in the pilot valve of the pilot safety valve of the nuclear power main steam valve group according to claim 1 is characterized in that: The fixed handle (1) and the sleeve head (3) are integrated.
3. The special tool for disassembling and assembling the embedded throttle valve in the pilot valve of the pilot safety valve of the nuclear power main steam valve group according to claim 1 is characterized in that: The fixed handle (1) and the sleeve head (3) are made of metal material.
4. The special tool for disassembling and assembling the embedded throttle valve in the pilot valve of the pilot safety valve of the nuclear power main steam valve group according to claim 1 is characterized in that: The sleeve head (3) matches the hexagonal nut (402) of the embedded throttle valve.
5. The special tool for disassembling and assembling the embedded throttle valve in the pilot valve of the pilot safety valve of the nuclear power main steam valve group according to claim 1 is characterized in that: The positioning hole (2) matches the adjusting screw (401) of the embedded throttle valve.