Abstract: An end assembly for a control valve adapted for receiving fluid under pressure, comprising: a valve body having a central bore therethrough; a sleeve member at least partially inserted in one end of the valve body and having a first port therethrough, the port being in fluid communication with the obre in the valve body; a collar member rotatably mounted to the sleeve and having a second port therethrough, the second port being in fluid communication with a source of fluid under pressure and the first port through the sleeve member; and a cap sealing insertable within the sleeve.

Abstract: A control device for determining what one, in a system of monitored functions, first became inoperative.

Abstract: A light-emitting indicator comprising: a housing having a longitudinal bore therethrough, a moveable member at least partially positioned within said bore, a light-emitting diode operable as a function of the position of the moveable member within the bore, a lens for displaying the light emitted from said light-emitting diode, and a bore provided in the upper portion of the moveable member for containing the light-emitting diode within the moveable member when the indicator is in its first operative position.

Abstract: A fluid pressure--activated warning system for a crane comprising a plurality of signal device actuators each further comprising a valve spool, shiftable in response to a dangerous condition, and adapted to permit the emission of an alarm on the occurrence of such dangerous condition.

Abstract: An angulated indicator lens secured to the top portion of a relay valve for providing maximum refraction and dispersion of the several indicating colors on the valve stem indicating the operative or inoperative position of the valve. The lens is constructed of a unitary transparent body having an interior angulated, truncated surface of approximately 45.degree. to the horizontal, with an exterior angulated, truncated upper viewing surface of approximately 54.degree. to the vertical. The transparent lens body receives ambient colored light from the stem providing the maximum refraction of light onto the first interior angulated surface and directing the color to be indicated through the lens medium and onto the second exterior angulated truncated surface for maximum indicating area.

Abstract: Control system for indicating which, of a plurality of sensed pressure control fluid functions, first malfunctions. The system includes a plurality of series connected devices, each such device includes a shiftable valve which, in one position activates an indicator, and, in another position deactivates said indicator. Signalling connections link the devices such that all indicators, save the one governing the first malfunction, remain in the indicating condition they were in prior to such malfunction occurring.

Abstract: A fluid pressure-activated warning system for a crane comprising a plurality of signal device actuators each further comprising a valve spool, shiftable in response to a dangerous condition, and adapted to permit the emission of an alarm on the occurrance of such dangerous condition.

Abstract: Control system for indicating which, of a plurality of sensed functions, first malfunctions. The system includes a plurality of series connected devices, each such device includes a shiftable valve which, in one position activates an indicator, and, in another position deactivates said indicator. Signalling connections link the devices such that all indicators, save the one governing the first malfunction, remain in the indicating condition they were in prior to such malfunction occurring.

Abstract: A device for controlling the supply of fluid to a valve actuator, thereby controlling the opening and closing of a valve, all in response to an input signal. Means are provided whereby once fluid communication between the valve actuator and the actuator fluid source is closed, said input signal alone may not reopen such fluid communication.

Abstract: Device for controlling of the opening and closing of a valve, including an automatic lockout requiring a manual reset, and further having an indicator for indicating the position of said valve.

Abstract: Device for providing a first signal to an actuator as a function of a further signal received from a further member, wherein on said device blocking said first signal, means other than said further signal are required to cause unblocking of said first signal.