Control Valve - Body/Bonnet with Clamp Connection

[lcl88]

Does anyone familiar with the control valve with clamp connection on the body and bonnet?
I did some background study on this type of connection and found that the clamp type connection is better than conventional bolted type in term of smaller size, lighter, easy maintenance, withstand high bending moments/forces, etc.
The valve design accordance to ANSI 16.34 and ASME section VIII div 2, is a ANSI 1500 valve, however, client rejected the valve due to this clamp design and stick to bolted type.
The hub, clamp, seal ring, bolt/nuts was design and manufactured by reputation company.
Very much appreciated if any expert here have more information to share on this clamp design, and the disadvantage/ limitation of this design as well.

 

[arash807]

There are different types of bonnet such as bolted bonnet,threaded,welded,extended and pressure seal type.pressure seal bonnet is used for design pressure more than 100 bar.as you can see in attached picture by increasing the internal pressure bonnet sealing improved,unlike bolted bonnet .