The stem is fully guided at the top and bottom with precise bushing.
An advanced packing shape with a live-loading springs washer provide long lasting stem tightness.
An auto-lubricated thrust washer is installed at the top of the stem as per reduce torque.
The downstream seat is anchored in place by seal weld or pressed in to guarantee perfect sealing at high pressure and temperature.
Anti blowout stem design prevents accidental expulsion of the stem when the re-packing is necessary.
The contact between seat and ball is guarantee by coil springs and loading rings , this feature also allowing thermal expansion.
One piece body eliminates the potential leakage of body/closure – body/bonnet joint.
A mechanical stop is provided to ensures proper ball orientation in open and closed position.