MIL-V-24642, MILITARY SPECIFICATION: VALVE, 2-INCH NPS, AUXILIARY TURBINE OVERSPEED TRIP, SOLENOID ACTIVATED (13 SEP 1984)., This specification covers the design and manufacture of solenoid activated turbine trip valves. Valve ratings shall be of the 600 pound class and1,500 pound class in accordance with ANSI B16.34 as specified (see 6.2.1).