The new study of the hand wheel torque

        In this paper, the current situation at home and abroad when the manual valve work, operating force is difficult to control, and design a new torque handwheel. Practice has proved that this new torque handwheel easy to use, low cost, can improve sealing reliability, extend valve life, out of the low-pressure valve rod diameter especially for large n.
         Hand wheel torque, torque close to the stem nut 3 v-shaped slope by a hand wheel on the bad effects through the ball. When the torque exceeds the predetermined value ship, v-shaped grooves inclined against the pressure spring 6 will push the ball into the hole, so that the stem nut hand wheel 5 slip, a sealing to prevent excessive stress between the sealing surface wear is reduced. Without reaching the specified torque value when no skidding, twisting it to increase short, so the reliability of sealing guaranteed.
A screw for adjusting the spring pressure to adjust the limit closing torque. Due to factors such as thermal expansion is generated in order to prevent jamming open, using an asymmetric v bad shape, so that the maximum torque is turned off Xu torque 1.5-2-fold.