A strength test device for gate valve closing parts

Abstract

The invention discloses a device for testing the strength of gate valve closing members. The device has the advantages that existing methods for testing the combined strength of closing members for wedge gate valves are improved, the combined strength of the closing members are tested and analyzed under torque and tensile load conditions in torque loading modes, opening and operating modes can betruly simulated under gate valve working conditions, the strength of the gate valve closing members can be tested, and accurate test data of various performance parameters can be obtained; the deviceis provided with a first fixing member and a second fixing member, the first fixing member is used for fixedly mounting a valve stem nut and is provided with a twisting driving device for driving thefirst fixing member to be twisted, an output shaft of the twisting driving device is provided with a torque sensor, and the second fixing member is used for fixedly mounting a gate segment; a force value sensor is arranged on fixing seats and is used for detecting stretching force on a valve stem when the valve stem nut is driven by the twisting driving device to rotate.

Description

technical field [0001] The invention relates to the field of valve strength testing, in particular to a strength testing device for gate valve closing parts. Background technique [0002] The combined strength of gate valve closing parts directly affects the opening and closing action performance. In the pipeline system under working conditions, the thermal expansion and contraction of the valve body and the valve stem are caused by the fluctuation of the medium temperature, and the gate and the valve seat are tightly closed for a long time, resulting in sticking and overloading. Due to factors such as the closing torque of the gate plate, the connection between the gate plate and the valve stem will be separated when the valve is opened, and this fault occurs inside the valve body, so the opening and closing state of the valve cannot be judged, and the entire pipeline system cannot be faulted in time. According to statistics, the unqualified rate of the tensile strength tes...

AI Technical Summary

Problems solved by technology

In the later stage of the process, after the valve stem is stretched and fails, due to the large tension on the valve stem, the diameter of the valve stem and the diameter of the trapezoidal thread will become thinner, which will further cause the pitch of the trapezoidal thread to become larger, so the stem nut and the trapezoidal thread on the valve stem will become smaller. Entering the state of engagement, the screw transmission fails, and the rotation transmission cannot be performed

So that the tensile test is not carried out in the later stage of the process, but the torque test is carried out. However, the standard test methods of gate valves at home and abroad only carry out the axial tensile test of the closing part, which is not consistent with the actual working conditions.

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