Valve rod leak-proof structure

Abstract

The invention discloses a valve rod leak-proof structure, which has the key point as follows: a valve rod is composed of an upper valve rod and a lower valve rod, wherein the lower valve rod is composed of a lower ceramic ring and a ceramic ring base, the lower ceramic ring is inlaid on the upper end of the ceramic ring base, the middle of the ceramic ring base is provided with a groove used for being connected with the upper valve rod, and the ceramic ring base is connected with a valve core; the inner side of a valve cap is inlaid with an upper ceramic ring corresponding to a lower ceramic ring, and the contact surface of the upper ceramic ring and the lower ceramic ring is a seal surface; the upper end of the upper valve rod is connected with a valve handle, and the lower end is connected with the ceramic ring base; and a valve spring is installed between the ceramic ring base and the valve core. The invention has simple structure, portable operation, low cost, favorable sealing property, long service life and low wear coefficient; the upper valve rod can be pulled out from the valve body at any time for maintenance so as to eliminate the defects that the valve rod can not be pulled out for maintenance when the traditional valve is used; the design is suitable for a valve which is communicated from top to bottom, namely a valve inputs from top and outputs from bottom; and when the valve is closed, fluid force and spring force can jointly achieve the purpose of the driving fit of porcelain facing.

Description

technical field

[0001] The invention relates to a sealing structure of a valve stem. Background technique

[0002] All kinds of valves currently used in industry, agriculture and daily life transmit torque through the valve stem to complete the opening and closing of the valve to the pipeline fluid. In order to achieve zero leakage of the internal and external seals of the valve, save energy, protect the environment and improve work efficiency, the valve must have reliable sealing performance. The sealing parts of the valve mainly include the contact between the opening and closing parts and the two sealing surfaces of the valve seat, the contact between the valve stem and the bonnet, the seal of the valve stem, the gasket contact between the valve body and the bonnet, etc. Among them, the leakage between the two sealing surfaces of the opening and closing parts and the valve seat is called the internal leakage of the valve, and the leakage between the valve stem and the bo...

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