Three-way valve and an internal and external leakage detection and conversion device

Abstract

The invention relates to a three-way valve and an internal and external leakage detection and conversion device. The three-way valve of the invention comprises a valve body, a columnar valve core andan elastic member. A columnar limit chamber is formed in the valve body. The elastic member is arranged at one end of the limit chamber, the other end penetrates the valve body, and an air intake through hole is formed in the other end. The valve core is sleeved in the limit chamber. One end of the elastic member abuts against the valve core, and the other end abuts against the limit chamber. Connecting grooves are formed in the side walls of the valve core. A first air passage through hole, a second air passage through hole and a third air passage through hole are formed in the valve body. The connecting openings of the three air passage through holes with the limit chamber are arranged in sequence along the central axis of the limit chamber. The three-way valve of the invention has the advantage of smaller cavity in the valve body.

Description

technical field [0001] The invention relates to a valve and a detection device, in particular to a three-way valve and an internal and external leakage detection conversion device. Background technique [0002] Three-way valve, as the name implies, has three channels, including one inlet and two outlets. The switching of the flow channel is realized by switching the spool of the three-way valve. The three-way valve is usually used for flow channel selection and switching. Existing three-way valves are mainly used to switch flow channels during liquid transportation. Therefore, in order to ensure that there are enough materials to circulate, the flow channels are set relatively large, and the valve body is also large. This can ensure the flow of materials on the one hand. On the other hand, it can also prevent the material from clogging and accumulating due to the slow flow rate at the valve body. However, the common three-way valve spool is plate-shaped, and the flow channe...

AI Technical Summary

Problems solved by technology

However, for these existing three-way valves, due to the existence of this cavity, part of the leaked helium gas will remain in the cavity, so that the amount of helium gas detected by the detector is less than the actual leakage amount, especially in high-precision detection devices. In the middle, this residual amount will have a great impact on the detection accuracy

Therefore, in the high-precision gas leakage detection, the existing three-way valve has the problem that the cavity in the valve is relatively large, which affects the detection accuracy.

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