Gas valve

Abstract

The invention provides a gas valve, and belongs to the technical field of gas accessories. The problem that an existing gas valve is short in service life is solved. The gas valve comprises a valve rod and a valve body, a valve element is arranged in a valve cavity and comprises a shell, the shell is provided with a big fire hole, a small fire hole and a long open fire hole, the shell is sleeved with an outer rubber sleeve, a small fire air outlet hole, a big fire air outlet hole and a long open fire air outlet hole are formed in the outer rubber sleeve in a radial penetrating mode, and a big fire air passage, a small fire air passage and a long open fire air passage are arranged on the valve body. A movable ceramic chip and a static ceramic chip are arranged in the shell, the movable ceramic chip is provided with a first fan-shaped opening, the shell is fixedly connected with a base, the base is supported on the static ceramic chip and fixedly connected with the static ceramic chip in the circumferential direction, an inner rubber sleeve is arranged in the shell, the attached position of the movable ceramic chip and the static ceramic chip is surrounded and sealed by the inner rubber sleeve, and the inner rubber sleeve is provided with a second fan-shaped opening which has the same angle with the first fan-shaped opening and is axially overlapped with the first fan-shaped opening. The sealing device has the advantages of good sealing performance, good applicability, long service life and the like.

Description

technical field [0001] The invention belongs to the technical field of gas fittings, in particular to a gas valve. Background technique [0002] Existing gas appliances (domestic gas appliances, commercial gas appliances, outdoor gas appliances, industrial gas appliances, etc.) control the flow of gas through a cock valve to adjust the size of the fire. [0003] The existing cock valve includes a valve body, the valve body has a valve chamber, and a rotating cock is arranged in the valve chamber. The gas passing channel connects the gas inlet and the gas outlet of the valve cavity, so as to supply gas to the gas appliance. [0004] Because the manufacturing of gas cock valves belongs to foreign (Italy, Germany) processing technology, the process is complicated, domestic manufacturing has great limitations, and the manufacturing cost is high, especially the processing of the tapered surface of the outer wall of the valve core and the tapered surface of the valve body. The r...

AI Technical Summary

Problems solved by technology

[0004] Because the manufacturing of gas cock valves belongs to foreign (Italy, Germany) processing technology, the process is complicated, domestic manufacturing has great limitations, and the manufacturing cost is high, especially the processing of the tapered surface of the outer wall of the valve core and the tapered surface of the valve body. The requirements are extremely high, resulting in a high scrap rate, and the plug valve is only suitable for low-pressure gas environment, which cannot meet the requirements of high- and medium-pressure gas, and the scope of application is small. The durability test of the plug valve has a limit of 100,000 switches, and the service life is not long enough. , when the hole diameter of the valve core outlet hole is required to be equal to 12mm or a larger flow rate is required, the valve body hole diameter and outer diameter of the plug valve need to be increased, and the outer diameter of the valve core is also increased, resulting in excessive friction on the cone surface , the torque of the plug valve is too large to be within the torque value stipulated by the national standard, which makes it unusable. In addition, when the plug valve core is slightly worn, and the sealant between the plug valve core and the valve body is reduced or flows into the vent hole Finally, there will be a gas leakage phenomenon, that is, the gas will enter the gas outlet of the small fire and the big fire from the gap between the cock spool and the valve body, resulting in the problem that the fire section cannot be adjusted

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