An actuator provides two step control of a dual valve or dual damper, such as in an HVAC system. The gear train includes projections on top and bottom faces of the final gear, the projections being rotationally offset from each other by an angle. Each projection mates into a slot of a Geneva-gear-type output member, with two such output members accessible, one on the top of the actuator and one on the bottom of the actuator. During the portion of the throw that the upwardly facing projection is in the slot of the upwardly exposed Geneva-type output gear, the final gear rotates the upper output member to control one flow blockage member in the valve or damper. During another portion of the throw, rotation of the final gear does not rotate the upper output member, but instead rotates the lower output member and its flow blockage member.

An actuator provides two step control of a dual valve or dual damper, such as in an HVAC system. The gear train includes projections on top and bottom faces of the final gear, the projections being rotationally offset from each other by an angle. Each projection mates into a slot of a Geneva-gear-type output member, with two such output members accessible, one on the top of the actuator and one on the bottom of the actuator. During the portion of the throw that the upwardly facing projection is in the slot of the upwardly exposed Geneva-type output gear, the final gear rotates the upper output member to control one flow blockage member in the valve or damper. During another portion of the throw, rotation of the final gear does not rotate the upper output member, but instead rotates the lower output member and its flow blockage member.

A valve with a valve body in which is rotatably mounted a valve member, the valve member having therein a ball check for selectively preventing fluid flow through the valve.

Provided is a steam valve (1) equipped with: a stop valve (2) capable of stopping/releasing the flow of steam when driven so as to open/close; an governing valve (3) that is provided coaxially in the interior of the stop valve (2), and that controls the flow volume of the steam when driven to open/close in the same direction as the opening/closing of the stop valve (2); and a first guide part (11) that is provided between the stop valve (2) and the governing valve (3) so as to separate the stop valve and the governing valve in the radial direction, and that guides at least the governing valve in the opening/closing direction.

A blowout preventer (BOP) includes a housing comprising a vertical bore extending through the housing and a shear body rotatable with respect to the vertical bore to shear an object located within the vertical bore.

A valve device comprises a body, a rotating valve set and a safety valve set. The body comprises an inner space, a first opening and a second opening. When the rotating valve set is located in a water-providing position, the inner space, the first opening and the second opening are communicable. When water pressure is higher than a safe pressure, the safety valve set and the rotating valve set can block the first opening and the second opening that safe pressure is maintained at the second opening. When water pressure becomes normal, the safety valve set is moved to its original position. Therefore, it has a piston-typed safety valve set is highly reliable. It has a coaxial structure to reduce its volume. It has an engaging and hooking structure for precise and easy assembly. It has an opening and/or closing function for its valve body with wide range of applications.