The torque of a valve refers to the force or torque that must be applied to open or close the valve, and is a comprehensive technical indicator for the action of the valve under medium pressure. When closing the valve, it is necessary to form a certain sealing pressure ratio between the sealing surfaces of the opening and closing parts and the valve seat. At the same time, it is also necessary to overcome the friction between the valve stem and the packing, between the threads of the valve stem and the nut, at the end support of the valve stem, and other friction parts. Therefore, a certain closing force and closing torque must be applied. In addition, during the opening and closing process of the valve, the required opening and closing force and torque vary, with their maximum values occurring at the final moment of closure or the initial moment of opening. In order to strive to reduce the valve and its closing force and torque, and evaluate the comprehensive performance of the valve, only by detecting the torque during the entire process of valve opening and closing, and judging the corresponding data, can reasonable conclusions be drawn. This is particularly important for the design and #manufacturing of valves.
