Device for detecting leaking performance of gas meter motor valve

The invention discloses a device for detecting leaking performance of a gas meter motor valve. A gas meter upper shell is arranged on a silica gel pad; the upper end of the gas meter upper shell is provided with a gas meter compressing device; a gas outlet of a first two-way electromagnetic valve is communicated with a negative-pressure gas source joint, and a gas inlet of the first two-way electromagnetic valve is communicated with a gas outlet at the upper end of the gas meter upper shell through the gas meter compressing device; a gas inlet of a second two-way electromagnetic valve is communicated with the atmosphere; one path of gas outlets of the second two-way electromagnetic valve is communicated with a gas inlet of a mass flow sensor, and the other path of the gas outlets of the second two-way electromagnetic valve is communicated with a gas inlet of a three-way electromagnetic valve; a gas outlet of the mass flow sensor is connected with the other gas inlet of the three-way electromagnetic valve and a gas storage tank respectively; and a gas outlet of the three-way electromagnetic valve is communicated with a gas inlet at the upper end of the gas meter upper shell through a gas inlet of the gas meter compressing device. The device has the advantages of simple structure, safety, reliability and simple control, and can detect the leaking properties of the gas meter upper shell and the gas meter motor valve respectively.