The valve bellows adopts the design of bellows seal, which completely eliminates the shortcomings of ordinary valve stem packing seal, such as fast aging and easy leakage. It not only improves energy efficiency, increases the safety of production equipment, reduces maintenance costs and frequent maintenance, but also provides a clean and safe working environment. Valve bellows are widely used in municipal construction, farmland water conservancy, thermal power generation, petrochemical, metallurgical mines, fire protection and environmental protection, food, shipping, medicine and textile and other fields. The existing valve bellows has complex structure, inconvenient assembly and production, and laborious operation.

In order to solve the technical problems existing in the prior art, the technical personnel provide a valve bellows with reasonable structure design, convenient assembly and labor-saving operation. The technical solution adopted by the valve bellows solves the technical problems existing in the prior art: a valve bellows includes a lower valve body, the inlet and outlet of the lower valve body have end flanges, and the inner cavity of the lower valve body A valve seat is provided in the middle, and a valve top ring is fixed on the valve seat; the lower end of the upper valve body is connected to the upper end of the middle valve body, and the flange at the bottom of the middle valve body is fixedly connected; the lower end of the valve stem is located in the lower valve body and is fixed with a disc cone. The side wall of the disc cone is provided with a sealing gasket matched with the valve top ring. Bellows, A packing is arranged between the outer wall of the middle upper part of the valve stem and the inner wall of the upper valve body, a gland is arranged above the packing, and the gland is fixedly connected with the flange on the top of the upper valve body; An arm is also fixed on the upper valve body, a bearing seat is fixed on the top of the arm, a bearing is installed on the bearing seat, a rotating sleeve with internal threads is fixed on the inner ring of the bearing, and the middle and upper part of the valve stem is provided with external threads and is connected with the rotating sleeve Threaded connection; the middle of the support arm is installed and fixed with a centralizer, the middle of the centralizer is provided with a vertical through hole, and the valve stem is located in the through the through the through the through the through the hole.

The advantages and positive effects of the valve bellows are: a valve bellows with a reasonable structure design is provided. Compared with the existing valve bellows equipment, the valve body in this technical solution is composed of an upper valve body, a middle valve body and a lower valve body, and the three parts are connected in sequence, which is convenient for valve body processing. After adopting the above design, the installation and positioning of the disc cone at the lower end of the valve stem is more convenient, and the installation of the bellows, packing and pressure sleeve between the valve stem and the middle valve body and the upper valve body is more convenient, which directly improves the convenience of overall assembly. By installing the centralizer in the middle of the support arm and making the valve stem pass through the through hole in the middle of the centralizer, the stability of the valve stem during the lifting process is improved. By setting the bearing seat and installing the bearing on the top of the support arm, the rotating sleeve is installed on the bearing, which improves the flexibility of the hand wheel when rotating, and is convenient and labor-saving.