Gas valve is a new type of safety supporting device for gas pipeline engineering, which is used to cut off, connect and adjust the gas in the pipeline.Usually, the gas valve is connected with a three-way joint, two of which are connected with the system pipeline respectively, and the three-way interface is sealed through the sealing structure.Existing technology of sealing structure including tamper plate and the plug and seal, tamper plate and the outer wall plug are equipped with external thread, tamper plate open for central special wrench inserted into the polygon hole, plug for special spanner has stuck on the top surface of a polygon convex sets, gasket is located in the opening week of inner cavity wall has, on the steps of threaded connection plug the opening at the bottom of the cavity and the press in sealing mat, tamper plate located above plug and threaded connections in the opening. So, tamper plate and the plug must use special wrench to unscrew, although it played a prevent others, the purpose of illegal appropriation of gas, however, when the budge tamper plate and the plug, managers need is temporarily shut down the pipe conveying gas, otherwise tamper under support plate and the plug, a large number of gas spewed from the opening to the outside, therefore, must be in the pipeline under the premise of the main gas valve, operation personnel to operate, and can't gas operation, thus the whole operation process is very troublesome and time consuming.

Valve through-rod assembly includes gasket, nut, sealing ring, through-rod and handle;The handle is connected at one end of the through-rod, and the other end of the through-rod is provided with a pointed head;One end of the nut is connected with the ball valve and sealed with a sealing gasket. The nut has a step hole, and the large diameter end of the step hole is oriented to the ball valve.At least one sealing ring is arranged on the hole wall at the small diameter end of the step hole and is connected with the pass rod in a sliding way.

The step hole is composed of two sections of holes with different diameters. The tip of the pass rod is located at the large diameter hole of the step hole before the three-way connector is connected.

The connection between the ball valve and the tee joint consists of a two-way joint, one end of which is threaded with a taper pipe at the sealing interface of the tee joint, and the other end is threaded with a taper pipe at one end of the ball valve.

1) due to the tee and then the ball valve seal outlet connections, again at the other end of the ball valve connection valve rod, valve rod activity part of the sliding and sealing connection within the fixed part, therefore, in the case of ball valve to open, will the pointed end of the active part of the valve rod end into the ball valve and puncture seal structure, the gas will not overflow from ball valve or valve rod, and then moving portion of valve rod pumped from within the fixed part and close the ball valve, with gas assignments can be completed through the operation, to avoid safety accident;

2) there are two types of connection between the nut and the ball valve of the valve pass rod. One type of structure is that the nut thread is connected to the outside of the ball valve interface, and the sealing pad is located inside the nut. The other type is that the nut thread is connected to the inside of the ball valve interface, and the sealing pad is located outside the nut;These two structures can be selected according to the actual use situation, which makes this tool more diverse and more applicable.

Valve rod assembly includes gasket, nut, seal ring, rod and handle.The handle is connected to one end of the through-rod, and the other end has a sharp tip.One end of the nut is connected with the ball valve and sealed with the sealing gasket. The nut has a step hole, and the large diameter end of the step hole is facing the ball valve, and the pass rod slides in the step hole.At least one sealing ring is arranged on the hole wall at the small diameter end of the step hole and is connected with the pass rod in a sliding way.Nut and ball as the first connection structure.