Ball valve testing machine

Abstract

The invention discloses a ball valve testing machine, and aims at providing the ball valve testing machine which is convenient to operate, is high in accuracy of testing results and can guarantee that two pipe ends of a ball valve are not liable to be damaged. The machine comprises an air supply valve, an air pressure sensor, a main frame, two pushing plate cylinders, two side racks, a main end cover, and an auxiliary end cover, wherein the two pushing plate cylinders are respectively disposed on the two side racks, a piston rod of one pushing plate cylinder is connected with the main end cover and a piston rod of the other pushing plate cylinder is connected with the auxiliary end cover. The main end cover is provided with a main elastic sealing ring pad, and the auxiliary end cover is provided with an auxiliary elastic sealing ring plate. The main end cover is provided with a main cover air hole. The beneficial effects of the invention are that the positioning and clamping of the ball valve is proper; the sealing performance is guaranteed; the ball valve cannot be damaged; the machine has an adaptive adjustment sealing structure, and can improve the sealing effect during high-air-pressure detection; the machine has an auxiliary positioning structure, can prevent the end cover from withdrawing, protects the pushing plate cylinder, improves the sealing effect, and maintains the stability of a detection process.

Description

technical field [0001] The invention belongs to the technical field of ball valve air tightness testing, in particular to a ball valve testing machine. 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 performance. [0004] The abov...

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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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