close-off rating

close-off rating

[′klōz ‚ȯf ‚rād·iŋ]
(mechanical engineering)
The maximum allowable pressure drop to which a valve can be subjected at commercial shutoff.
The maximum allowable pressure drop between the outlet of a three-way valve and either of the two inlets, or between the inlet and either of the two outlets.
References in periodicals archive ?
The valve close-off rating is independent of the actual valve body rating.
With modern electric control valves, such as characterized ball valves that have 50 or even 100 to 1 rangeability and 200 psi close-off ratings, the need for and benefits of reverse-return are largely eliminated.