scope:

Scope.

This specification covers flow control valves of dilating, low torque, hysteresis-free design employing multiple-segment irising seat-disks construction for naval shipboard water, oil, and gas services. These valves are for precise flow control of liquids and gases and allow unconstrained flow when fully open.

intended Use:

Valves covered by this specification are high-reliability, are intended for service aboard Navy ships with a 30-year service life, and meet Navy shock and other unique requirements.