The bonnet type DVD Gate Valves with rising stem provides with a functional thread which is outside the valve chamber.

During the operation, the stem revolves in the stem nut which carries along a flexible wedge. Due to its design, low torque values are achieved which eases the revolving of the stem.

The stem is locked against axial movement by a collar fitted between the cover and the gland body and no axial movement occurs in the specified conditions.

The wedge is guided in the body in a precast groove and provides an undisturbed water flow when the valve is open.

The body and the wedge have pressed-in/threaded sealing seat to have drip tight sealing when the valve is closed. The rising feature allows the stem to move up and down at the top of the valve, acting like a position indicator.