Tag Archive for: How do you calculate valve torque?

The torque of API600 gate valve is the opening torque of the valve (valve torque). Unit: Newton. Meter.

Opening torque, also known as operating torque, is the most important parameter for selecting valve driving device. The opening torque is also another important index to measure the quality of valve products. When people evaluate the quality of valve, it is often described as light and flexible opening of valve. In the pipeline valve standards of some advanced industrial countries, it is regarded as one of the assessment indicators, and it is stipulated that the opening torque of manual valve shall not exceed 360n • M. If this torque is exceeded, it is necessary to consider selecting appropriate driving devices (such as electric, pneumatic and hydraulic devices). Some manufacturers print the opening torque in the product sample to facilitate users’ selection.

Opening torque (torque) refers to the force or torque that must be applied to open or close the valve. When closing the valve, it is necessary to form a certain sealing specific pressure between the opening and closing parts and the two sealing surfaces of 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, and between the end support of the valve stem and other friction parts. Therefore, a certain closing force and closing torque must be applied. The opening and closing force and opening and closing torque required by the valve in the process of opening are changed, and the maximum value is at the final moment of closing or the initial moment of opening. When designing and manufacturing valves, try to reduce the opening and closing force and opening and closing torque.

The opening torque can be calculated or measured to obtain approximate results, or measured by torque wrench.