A rotary servo valve includes a valve body having a longitudinal bore therethrough. A sleeve fits into the bore. The wall of the sleeve is perforated by two groups of port openings, each group includes a plurality of sets of radially-disposed ports. In each group, the central longitudinal axis of one set of ports is radially displaced from the central longitudinal axis of one other set of ports by a preselected angular displacement. At least a third set of ports in one group is in continuous fluid communication with a source of pressurized fluid; at least a third set of ports in the other group in continuous fluid communication with a return sump. A hollow rotary control member consists of two internal chambers. Each chamber includes a number of sets of apertures that are radially disposed around the walls of the chambers, spaced-apart by a preselected angular separation. A torque motor means is furnished to rotate the control member between two opposite angular positions with respect to a null position, thereby to apply power to cause a hydraulic actuator to operate in a desired manner.

Low inertia servo valve

A method and apparatus for deslagging boilers and the like while steaming, wherein a quenching-type stream of water is first applied to the outer surface of the hot slag to induce the formation of fissures by embrittlement and contraction of the slag and thereafter while the fissures are still present the fissured surface of the slag is impacted by a high velocity pulsed jet which drives water into the fissures, whereby dislodging of the slag is aided by the expansive force of water which vaporizes in the fissures. A generally conventional blower is illustrated, equipped with dual liquid supply and projecting means, and pulsing mechanism for interrupting the flow of blowing medium to one of the projecting means, to create the pulsed jet.

Method and apparatus for removing deposits from highly heated surfaces

A method and apparatus for removing adherent deposits from high temperature surfaces such as the fire sides of the tubes of boilers while steaming is disclosed as employing a sootblower to project a moving pulsed jet of liquid against the deposits The peak impact pressure of the jet is increased by pulsing means disclosed as of a fluidic or rotary type

Pulsed liquid jet-type cleaning of highly heated surfaces

Hydraulically reciprocable and vibratory track working tools are operated with a control in the hydraulic circuit which generates a pulsating stream of hydraulic fluid and delivers this stream to a separate hydraulic motor to which hydraulic reciprocating motors are connected or directly to the hydraulic reciprocating motors for the tools so as to vibrate the same. The control includes an impulse generator for imparting impulses to the hydraulic fluid and a check valve assembly, control conduits for delivering the pulsating hydraulic fluid stream to inlets of the valve assembly, further conduits for delivering the pulsating hydraulic fluid stream from the outlets of the valve assembly to respective chambers defined by the hydraulic motors, and respective ones of the valves alternatingly blocking and permitting passage of the pulsating hydraulic fluid stream from the inlets to the outlets of the valve assembly.

Track working machine with vibratory and reciprocable track working tools

Process and apparatus for treating material by applying non-sinusoidal vibrations. In apparatus for separating solids from the liquid phase of a dispersion, non-sinusoidal vibration is applied by vibrating at least a portion of a wall of a receptacle for the dispersion or by a vibrating plate, a pair of vibrating plates or a hollow body in the receptacle. In a roller mill for crushing material one of the rollers is vibrated axially relative to the other. In a juice press a vibrating plate is provided at the bottom of the press cylinder. In a jaw crusher, one of the jaws is vibrated in a direction parallel to the face of the jaw. In a ball mill comprising a cylinder rotating on a horizontal axis, the cylinder is vibrated in an axial direction. Non-sinusoidal vibration is produced by a hydraulic servomotor fed with pulses of hydraulic pressure fluid by a rotary control valve.

Apparatus for treating dispersions and the like with non-sinusoidal vibration

A method and apparatus for producing vibratory movement comprises a work piston reciprocable in a work cylinder, a supply of fluid under pressure and a slide valve for controlling the supply of pressure fluid to reciprocate the pistons. In one form the slide valve has a cylindrical housing and a piston that is rotatable by a motor to supply pressure fluid intermittently to the work cylinder and is axially movable manually, mechanically, hydraulically, electrically or by other power equipment to control the area the valve ports are opened and hence the rate of movement of the work piston. In another form the slide valve has a housing and a valve piston that is reciprocable by a cam wheel to supply pressure fluid intermittently to the work cylinder and is rotatable manually, mechanically, hydraulically, electrically or by other power equipment to vary the opening of the valve ports and hence the rate of movement. Selective action of the slide valve is obtained by providing two cam wheels of different characteristics and air springs for biasing the valve slide toward one or the other cam wheel.

Method and apparatus for producing vibratory motion

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Method and apparatus for producing vibratory motion