Abstract: An automatic drain for a compressed air system can have a valve body containing an internal fluid reservoir which communicates via a main air inlet passage with a compressed air container such that fluid can flow from the air container into the internal reservoir. A filter can be provided prior to the internal reservoir so that only fluid passes into the internal reservoir. Accumulated fluid in the internal reservoir can be drained through a discharge port regulated by a valve assembly which can be opened and closed by a controller in response to the level of fluid accumulated in the internal reservoir as detected by a sensor.

Abstract: A nozzle dam for providing a fluid-tight seal across a primary fluid nozzle in the plenum of a nuclear steam generating vessel includes an elongated shaft coupled at one end thereof to an anchor assembly frictionally engageable with the inner surface of the nozzle to anchor the dam in place and a fluid-impermeable seal apparatus coupled to the shaft and closing the nozzle and frictionally engageable with the inner surface thereof to form a fluid-tight seal. The seal apparatus includes a circular plate disposable in wedging frictional engagement with a frustoconical portion of the nozzle inner surface. The shaft extends through a central aperture in the plate and is threadedly engaged with a nut which holds the plate in place. The anchor assembly includes a foldable tripod arrangement coupled to the shaft in such a way that movement of the shaft toward the seal plate effects an increase in the frictional anchoring force. The seal assembly also includes an inflatable portion.

Abstract: A manipulator control system uses a microprocessor to compute appropriate control parameters in order to maintain constant tangential velocity of a spray nozzle in relation to the inside surface of a spherical portion of a nuclear steam generator. The microprocessor also computes, in one of the three modes of operation, of the control system, appropriate control parameters for maintaining a predetermined distance between the nozzle and the center of the spherical enclosure.