Bonnet less valves have no bonnet under pressure, the only
pressure containing part of the valve is the body.
This feature removes the need for a separate bonnet and eliminates
any gasket leakage, any bolted connection in case of bolted bonnet
design and any welds in case welded bonnet designs.
Instead of the bonnet there is the yoke with structural functions
only, this design allows in-line repair or inspection to be carried
out more easily and at less cost than any other valve.
Stem, disc, and packing can be quickly removed and the seat fully
exposed for “like new” restoration.