These are the steam inlet and outlet valves of the worlds larges Steam engine which is still running and can been seen at Kew Bridge Steam Museum. West London
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/61132483@N00">Les Chatfield</a> from Brighton, England
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/61132483@N00/2975215/">90" engine  valves</a>