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A Method for Measuring Valve Assembly Torque Relaxation

An assembly force and valve technology, applied in measuring devices, power measurement, torque measurement, etc., can solve the problems of not satisfying the static sealing specific pressure, affecting the static sealing pressure of the gasket, and reducing it, achieving high precision and low cost Effect

Active Publication Date: 2015-08-19
BEIJING INST OF ASTRONAUTICAL SYST ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The assembly torque of the valve directly affects the static sealing pressure at the gasket (the gasket bears the axial force). After the initial assembly is tightened, the assembly torque will relax over time to reduce the static sealing pressure (the axial force becomes smaller), which may lead to unsatisfactory The specific pressure of the static seal makes the static seal invalid

Method used

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  • A Method for Measuring Valve Assembly Torque Relaxation
  • A Method for Measuring Valve Assembly Torque Relaxation
  • A Method for Measuring Valve Assembly Torque Relaxation

Examples

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Embodiment

[0017] Such as figure 1 As shown, the outer sealing structure of the valve is composed of a shell 1, a gasket 2, a compression nut 3 and a compression sleeve 4; Installed in the threaded mounting hole of the housing 1, the compression nut 3 compresses the compression sleeve 4;

[0018] Three strain gauges are evenly installed on the outer surface of the housing 1 for strain measurement;

[0019] The steps of this method are:

[0020] 1) Apply torques of 20Nm, 40Nm, 60Nm, 80Nm and 100Nm to the compression nut 3 in sequence, and record 3 strain values ​​at the same time after each application, and the relationship between the strain of the shell 1 and the torque of the compression nut 3 is obtained as figure 2 shown;

[0021] 2) Collect the calibrated strain gauges for a long time, and after 24 hours, the strain value of shell 1 decays to a stable state, and the obtained strain curve is as follows: image 3 shown;

[0022] 3) Through the calibration curve obtained in step ...

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Abstract

The invention relates to a method for measuring looseness of a valve assembling moment and belongs to the technical field of valve moment measurement. The method for measuring the looseness of the valve assembling moment comprises the following steps: calibrating a relationship between axial strain of a valve shell and an assembling moment, so as to obtain a calibration curve; carrying out long-time acquisition on the calibrated axial strain of the valve shell until a strain value is attenuated to a stable state, so as to obtain a strain curve; converting the strain curve into a moment curve by virtue of the strain curve. By adopting the method for measuring the looseness of the valve assembling moment, residual assembling moment of a product in a valve state can be effectively measured, accuracy is high, cost is low, and the method for measuring the looseness of the valve assembling moment is significant for researching looseness of the assembling moment and evaluating the effectiveness of a measure used for preventing a valve moment from being loose; an axial force of a spacer is guaranteed by virtue of a certain assembling moment when a valve is assembled, and further effective valve seal is guaranteed; after a valve is assembled and screwed up for the first time, the assembling moment has a loosening effect, static seal can be invalid, and measurement on a residual moment value needs to be carried out on an assembled valve for researching the looseness characteristic of the valve assembling moment.

Description

technical field [0001] The invention relates to a method for measuring the slack of valve assembly torque, belonging to the technical field of valve torque measurement. Background technique [0002] The assembly torque of the valve directly affects the static sealing pressure at the gasket (the gasket bears the axial force). After the initial assembly is tightened, the assembly torque will relax over time to reduce the static sealing pressure (the axial force becomes smaller), which may lead to unsatisfactory The specific pressure of the static seal makes the static seal invalid. In order to ensure that the static seal of the valve does not fail, effective measures must be taken to prevent or reduce the loosening of the assembly torque. Therefore, there is a need for a method for measuring assembly torque relaxation, which can be used to judge the remaining assembly torque of the valve and evaluate the effectiveness of valve anti-torque relaxation measures. Contents of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L3/00
Inventor 曾斌刘敏尹伟李娟娟岳兵尹文辉李德权孙海鹏王堃
Owner BEIJING INST OF ASTRONAUTICAL SYST ENG
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