The strength of the valve refers to the ability of the valve to withstand the pressure of the medium. The valve is a mechanical product that is subjected to internal pressure, so it must have sufficient strength and stiffness to ensure long-term use without rupture or deformation.

The sealing performance of the valve refers to the ability of each sealing part of the valve to prevent the leakage of the medium, which is the most important technical performance index of the valve. There are three sealing parts of the valve: the contact between the opening and closing parts and the sealing surface of the valve seat; Packing with the valve stem and stuffing box; The connection between the valve body and the valve cover.

Opening and closing force and opening and closing moment refers to the force or moment that must be applied to open or close the valve. When closing the valve, it is necessary to form a certain specific sealing pressure between the opening and closing parts and the sealing surface of the hair seat, and to overcome the thread between the valve stem and the packing, and the valve stem and the nut.