Abstract: The invention relates to a percussion device having a body and a percussion piston moving therein, pressure fluid spaces in the rear and front ends of the percussion piston and pressure fluid channels for feeding pressure fluid into the percussion device. The percussion piston and the control valve comprise surfaces, which, when aligned, substantially close the pressure fluid flow from the pressure fluid space locating behind the percussion piston in front of the control valve, whereby the produced pressure displaces the control valve to another position.

Abstract: A system to provide mechanical energy to well-head equipment by directing pressurized gas existing in nearby pipelines to an engine. The engine is a linearly reciprocating piston in a closed cylinder driven by pressure differentials between the gas on either side of its piston, the differential being controlled by a switching valve which directs higher and lower pressured gas to the appropriate side of the piston, and which recirculates spent gas from the lower pressure side of the piston back to the pipeline. The system is a closed system, and avoids venting or flaring gas used in the engine.

Abstract: A hydraulic pressure intensifier includes a supply connection, a return connection, and a high-pressure connection. An intensifier piston assembly includes a high-pressure cylinder with a high-pressure piston displaceable therein and a low-pressure cylinder having a greater cross-section than the high-pressure cylinder, with a low-pressure piston which is displaceable therein. The low-pressure piston is connected to the high-pressure piston and divides the low-pressure cylinder into a first low-pressure chamber on the side of the high-pressure piston and a second low-pressure chamber. A switching valve acts on the second low-pressure chamber with pressure from a pressure source or relieves it of pressure.

Abstract: In a valve arrangement in pneumatic impact motors (10), the housing (40) of a distribution valve has the form of a plastic bowl (46) which is flanged outwardly at the opening and the bottom thereof. A flat valve (50) is movable between the bowl bottom, which forms one valve seat (51) of the valve housing (40), and a bowl cover member (53), which forms the other valve seat (52). The bowl flanges (47, 48) define therebetween a groove which connects with a delivery channel (39) provided in the impact motor (10), this channel delivering compressed air to the flat valve (50) mounted inside the bowl (46). The bowl wall located between the flanges (47, 48) includes calibrated side openings (57, 58) which control the delivery of compressed air to respective valve seats (51, 52) on respective sides of the flat valve (50), this air delivery being an adapted and calibrated delivery.

Abstract: A piston valve diaphragm for a percussion apparatus including a valve portion having a diaphragm bore and a fluid supply source. A piston having a first piston surface and a second piston surface are also included. A diaphragm is mounted in the diaphragm bore and is displaceable in a first direction which permits fluid communication between the fluid supply source and the first piston surface and limits fluid passage between the fluid supply source and the second piston surface. Displacement of the diaphragm in a second direction permits fluid communication between the fluid supply source and the second piston surface and limits fluid passage between the fluid supply and the first piston surface. The diaphragm may be formed entirely from a flexible material or may contain a rigid center portion with flexible edge portion.

Abstract: A reciprocating positive displacement pump is disclosed for pumping oenological liquids such as wines, musts, distillates, vinegars and the like, alimentary oils and other alimentary liquids and/or beverages such as fruit juices and pulpy and sugary juices. The pump is of the kind which has a reciprocating piston and distributing ball valves utilizing rubber-covered balls, and comprises a double-action hydraulic cylinder for actuating the piston, the hydraulic cylinder being fed by a central distribution unit which is in turn fed by a source of presurized fluid. The piston has a cam member mounted to its stem. The cam member is movable between contact with two limit switches upon reciprocation of the piston so as to cause direction reversal of the piston. Further, a rotating member can be provided in contact with the cam member, so as to rotate the cam member and thus, the piston stem and piston.

Abstract: The invention relates to a hydraulic striking mechanism including a cylinder, a percussion piston guided therein and a piston return device which is supported on the percussion piston and is displaceable independently thereof and can be connected on its side facing the percussion piston tip alternatingly to a pressure source or a pressure-free return conduit. The piston return device is configured as an annular piston which is freely displaceable along the percussion piston and the cylinder and forms therewith a piston chamber. The percussion piston has an abutment face at its end remote from the percussion piston tip which cooperates with the annular piston for moving percussion piston in the return stoke direction. The percussion piston, together with the cylinder, defines an oil chamber which axially follows the piston chamber in a spaced relationship. The percussion piston is provided with a cylindrical shoulder within the oil chamber which determines its end position during the return stroke.

Abstract: A painter shaker having a base housing with a double acting pneumatic piston and cylinder motor horizontally mounted within said housing. The motor includes a cylinder and a reciprocable piston in the cylinder having a piston rod slidably and sealably extending through one end wall of said cylinder. A clamp mechanism for holding a container to be shaken is secured to a vertical shaft rotatably mounted on said housing for oscillation about a vertical axis. A crank arm connects the vertical shaft to the piston rod. A disc type bistable control valve is mounted transversely directly on the lower side of the air cylinder. The bistable valve includes outlet ports communicating with inlet ports on the cylinder at the rod end and compressed air is supplied to said valve through a check valve, the control disc controlling the flow of air to the outlet ports.

Abstract: This invention relates to an automatic hydraulic reversing valve for a double-action working cylinder. The purpose of the invention is to employ valves of this type without the requirement of an expensive servo-control mechanism, but nevertheless having a high operating reliability. The present invention, in avoiding the use of servo-control devices, utilizes a separate thrust piston which urges a control piston into a startup position, at which position the hydraulic medium is directed to the thrust piston end of the control piston, a blocking slide valve also being employed in the system and being mounted in the control piston for connecting the thrust piston end of the control piston to a tank or for blocking the connection to the tank.

Abstract: A compressed-air pile-driver, especially for axially insertable tools, including a ram arranged in a housing. The interior of the housing is divided by the ram respectively into an upper compression or expansion chamber and a lower compression or expansion chamber, which can each be alternately connected to a compressed-air source via air connection pipes and a control valve, with each having an air-outlet orifice opened alternately by the ram. In the upper expansion chamber, a pressure chamber, into which the upper air connection pipe of the upper expansion chamber opens, is divided off by an intermediate plate which is approximately parallel to the end face of the ram. Located in the intermediate plate is at least one orifice which connects the pressure chamber to the upper expansion chamber, and which is closed in a leak-proof manner by the ram in its upper dead-center position, the ram additionally being retained firmly in its upper dead-center position by a retaining device.

Abstract: A pneumatic drive for a hammer tool has a cylinder; a piston slidably received in the cylinder and dividing the inner space of the cylinder into two cylinder chambers; a drive output member formed as a piston rod attached to the piston and projecting from the cylinder; a pressure-responsive valve for admitting compressed air alternately to the cylinder chambers; and a plurality of spaced, serially arranged cylindrical discharge ports in the cylinder wall for releasing compressed air alternately from the cylinder chambers dependent upon the position of the piston with respect to the discharge ports.

Abstract: Fluid-actuated percussion mechanism includes a housing with an internal cylindrical space receiving a reciprocating piston dividing the space into a working stroke chamber and an idle stroke chamber. The mechanism further includes fluid distributing means mounted in the housing and communicating the chambers and the source of the working fluid. The housing also accommodates a work-performing member adapted to receive impacts from the piston. The distribution means includes at the inlet of at least one of the chambers a valve made in the form of a resilient annular element. The surface of the distribution means has made therein valve seats of which the number corresponds to that of inlets for supplying the working fluid into the chamber.