The centering shaft of the semi pneumatic ball valve disc adopts the static seal between the adjusting pad and the gland. The valve stem made of stainless steel adopts a double-layer sealing structure (Figure 4), because the valve stem is only 9O. Reciprocating motion makes the packing wear less. Under normal working conditions, the opening and closing times can reach 0.6~10000 times. The valve rod torque is MF valve rod torque, the valve rod torque when N mmM0F is closed N mmMF1r friction torque between packing and valve rod, the friction torque in N mmMZc bearing, and the wall thickness of N mm valve body is calculated according to the calculation formula of ANSI B16.34 wall thickness, or selected by referring to the wall thickness data specified in JB/T 7745.

How can users choose the manufacturer of electric ball valve? The first aspect is to let users pay attention to the performance of their manufacturers' production strength, because the quality of products is often related to the production strength of manufacturers. If manufacturers do not have good production strength in their own production, Then, naturally, it can not show the greatest advantages in the use of products.