Ball valve sealing testing apparatus

Abstract

The invention discloses a ball valve sealing test apparatus, and provides a ball valve sealing testing apparatus that has advantages as convenient operation and high accuracy on test result, and two pipe ends of the ball valve can be ensured not to be easily clamped and damaged. The apparatus comprises an air feed pump, an air pressure sensor, a mainframe, two push pedal cylinders, two lateral frames, a main end cap, and an auxiliary end cap; the two push pedal cylinders are set on the two lateral frames respectively; one push pedal cylinder piston rod is connected with the main end cap and the other push pedal cylinder piston rod is connected with the auxiliary end cap; the main end cap has a main elastic sealing ring pad; the auxiliary end cap has an auxiliary elastic sealing ring plate; and the main end cap has a main cover pore. The beneficial effects of the present invention are that the positioning and clamping of the ball valve is perfect and the sealing can be ensured without clamping and damaging the ball valve; a sealing structure adaptive to adjusting is provided for enhancing the sealing effect when testing in high air pressure; an auxiliary positioning structure is provided to avoid the end cap from returning, so as to protect the push pedal cylinders, raise sealing effect, and maintain the stability in the process of test.

Description

technical field [0001] The invention belongs to the technical field of ball valve airtightness testing, and in particular relates to a ball valve airtightness testing device. Background technique [0002] Ball valves are commonly used opening and closing parts for gas or liquid circulation. They are used in different occasions and have different sealing requirements. Therefore, they need to be tested for sealing before leaving the factory, otherwise there will be greater safety hazards. [0003] In the prior art, when testing a ball valve, a gasket or a sealing ring is usually placed on the outside of both ends of the ball valve, and at the same time, a force-applying device such as a jack or a hydraulic cylinder is used to clamp the two ends of the ball valve, so that the gasket or sealing ring and the ball valve are two The end is sealed, and the whole sealed ball valve is immersed in water, and then compressed gas is passed into the ball valve to test its sealing performa...

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Problems solved by technology

[0004] The above-mentioned test method has the following disadvantages: 1. The operation process is complicated, and the weight of the frame is relatively heavy. It is necessary to immerse the frame in water with the help of external equipment, and the installation of the ball valve is also relatively troublesome; 2. The ball valve is sealed by pressing down the plate with a jack And when the sealing ring is placed outside the two ends of the ball valve and clamped on both ends of the ball valve by a hydraulic cylinder for sealing, the strength of both is difficult to control. The seal of the part is not reliable, which will affect the accuracy of the test and cause misjudgment of quality. If the force of pressing down or clamping is excessive, the ball valve will be deformed, causing the end surface (pipe end) of the ball valve to be uneven, thus making the ball valve It cannot form a seal with the pressure plate, which will lead to misjudgment of quality. In addition, if the force of pressing down or clamping is excessive, the ball valve may be directly damaged

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