ANSI cast steel RS wedge gate valve Z41H-300LB

Rising stem gate valve, also known as rotary stem gate valve (also known as rising stem wedge gate valve). The valve stem nut is installed on the gate plate, and the handwheel rotates to drive the valve stem to rotate, thereby lifting the gate plate. Usually, there are trapezoidal threads at the bottom of the valve stem. Through the threads at the bottom of the valve and the guide groove on the valve disc, the rotational motion is converted into linear motion, that is, the operating torque is converted into operating thrust. When the valve is opened, when the lifting height of the gate is equal to 1:1 times the valve diameter, the fluid channel is completely unobstructed, but this position cannot be monitored during operation. In actual use, the vertex of the valve stem is used as a marker, that is, the position where it cannot be opened, as its fully open position. To consider the phenomenon of locking due to temperature changes, it is usually done by opening the valve to the top position and then reversing it by 1/2 to 1 turn as the position for fully opening the valve. Therefore, the fully open position of the valve is determined by the position of the gate (i.e. stroke).