1. The sealing surface of valve disc and valve seat is overlaid with iron-based alloy or Stellite cobalt based cemented carbide, with good wear resistance, high temperature resistance, corrosion resistance and abrasion resistance, and long service life;

2. After quenching and tempering and surface nitriding treatment, the valve stem has good corrosion resistance and scratch resistance;

3. All kinds of piping flange standards and flange sealing surface types can be adopted to meet various engineering needs and user requirements;

4. The valve body has a wide range of materials, and the packing and gasket can be reasonably selected according to the actual working conditions or user's requirements, which can be applied to various pressure, temperature and medium working conditions;

5. The inverted seal is made of thread connection seal seat or body overlaid with austenitic stainless steel. The seal is reliable. The replacement of packing can be carried out without stopping the machine. It is convenient and fast, and does not affect the operation of the system.