Abstract: A main spindle of an air saw is reciprocated by sliding a piston in a cylinder chamber with the pressure of air supplied to the cylinder chamber via an air supply path so as to alternately apply the air pressure to pressure-receiving surfaces of a back plate and a front plate, wherein a rear air-cushion chamber is formed in a portion for fixing a return spring for urging the back plate toward the center of a cylinder while a front air-cushion chamber is formed in a portion for fixing a return spring for urging the front plate toward the center of the cylinder, so that the front and rear balance is maintained.

Abstract: Operation of a system for injecting a predetermined amount of a secondary fluid into a primary fluid stream. The system uses a liquid additive injection pump driven by a fluid powered motor that is driven by the primary fluid stream and can be selectively suspended by an on/off switch mechanism. The fluid powered motor includes a housing enclosing a differential pressure piston assembly having a piston movable within housing between upstroke and down stroke positions; a valve mechanism establishing a differential pressure within the housing to produce movement of the piston; an over-center mechanism coupled to the valve mechanism to toggle the valve mechanism between open and closed positions; and an actuating shall coupled to the over-center mechanism.

Abstract: A micro-adjustable hydraulic driving device includes a hydraulic cylinder, a control valve, and a cam. By utilizing a cam, it can precisely control the position of the sliding block and controls the size of the flowing cross-sectional area. So, it can achieve the purpose of precise controlling for the push rod to move slowly or stay at a desired position within the stroke. This invention can precisely control the moving speed and position of the push rod of the heavy load hydraulic cylinder. It can achieve the micro-adjusting effect. It can quickly reverse the moving direction and is easy to operate and control. And, its structure is simple with lost cost.

Abstract: Applicant provides a novel liquified booster pump. The pump takes high pressure boosted gas to a higher pressure. The pump is a pneumatically driven liquified gas booster pump with a shuttle valve enclosed within a body of the pump. Furthermore, the gas which is use to be boosted is carried from an inlet on the body of the pump to an outlet on the body of the pump, the boosted gas being carried entirely within the body of the pump with no external tubing. The pneumatically driven booster pump has a double ended piston within the central body and at least one shuttle valve incorporated in the piston for transferring gas from one side of the piston to the other.

Abstract: A pumping unit, particularly for water supply in remote areas of the world, comprising a pump, control valve and tipping bucket mechanism enclosed in a single housing. The pumping unit is double-acting and, does not demand the presence of a drive pipe. The pump and the automatic control valve are powered by the potential energy of the supply and an independent power source is not necessary or required. The frequency at which the unit operates may be varied by adjustment of the supply of water to the tipping bucket.

Abstract: For the oscillating triggering of a double acting operating cylinder (4), a reversing valve (6) has been provided and has been inserted between the pressure supply connector (5) and the two operating cylinder drive connectors (2,3) that is driven via two NOT elements (7,8), that each have been assigned to an operating position and connected with a drive connector (2,3). The reversing valve (6) is caused by pressure to periodically switch between the two operating positions. In order to stop oscillating with a defined final position of the operating cylinder (4) or start it up again, at least one of the NOT elements (7) has been provided with a pressure supply connector that can be triggered independently from the supply connector (5).

Abstract: A web cutting device for cutting a web in which a an actuator acts upon a cutter blade so as to produce the cutting stroke. The actuator includes several cylinders placed inside a container or alternatively a number of cylinders placed individually in a plurality of containers. Each of the cylinders includes a piston and a piston rod, the piston rods being attached to the cutter blade with a certain spacing along the length of the cutter blade in a direction transverse to the running direction of the web.

Abstract: A wellhead mounted pneumatic actuator for bottom hole oil pumps designed for operation by compressed air or gas. The preferred embodiment utilizes a single action cylinder with the downstroke actuated by the weight of the sucker rods and the fluid contained therein. Sufficient relatively high pressure air or gas from an external source is supplied under the piston of the cylinder to lift the piston at all times. A pressure or solenoid control floating piston bleeder valve selectively routes air or gas into the power cylinder on both sides of the piston to accomplish the downstroke. First and second contactors are mounted to cables suspended from a spreader reciprocating with the piston to contact respective first and second pivot arms to pivot the pivot arms into engagement with the respective first and second activator buttons of the bleeder valve to shift the bleeder valve from one position to the other to effectuate the selective routing of air or gas to the top of the piston as well as under the piston.

Abstract: In accordance with an illustrative embodiment of the present invention, an expansible chamber device includes a piston movable within a cylinder, a head on the cylinder having intake and exhaust ports, a normally-open intake valve for closing the intake port automatically when the flow rate or velocity of a working medium entering the cylinder reaches a predetermined value, variable restraining means for inhibiting closing of the intake valve in response to flow, an exhaust valve for preventing escape of working medium from the cylinder until cylinder pressure is reduced to a set level, spring means for opening the exhaust valve at that level, and means operable near the top-dead-center position of the piston for automatically opening the intake valve and for closing the exhaust valve to enable the cycle to repeat. A unique system for controlling the variable restraining means, as well as methods for regulating the flow or working medium through said valves, also is disclosed.

Abstract: In the hydraulic breaker according to the present invention, oil pressure at a fixed value always flows in the circuit at a low pressure side whenever the piston is raised or lowered, to prevent the need for an accumulator in the circuit at the low pressure side. At the same time, a high pressure oil is required during the raising and lowering of the piston, bringing about less of a change in the surge pressure, attributing to the fact that there is no need for an accumulator in the circuit at the high pressure side. Moreover, the hydraulic breaker of the present invention is advantageous by providing an increased striking force because the high pressure oil is used, in addition to the reaction force of the compressed nitrogen gas, when the piston is lowered to strike the chisel.

Abstract: A turning gear is used to rotate a turbine rotor under conditions where it is heating up or cooling down without sufficient motive fluid to cause it to rotate. The turning gear avoid the occurence of a thermal bow. A hydraulic turning gear is disclosed for application in confined areas where a substantial force is required to provide rotation to the rotor. A booster cylinder is used to elevate low pressure fluid for use in a reduced diameter hydraulic cylinder. A ratchet wheel and pawl mechanism uses an adjustable friction force to withhold the pawl from the ratchet wheel after initial contact and further employs a stationary guide rail to reset the pawl for the next contact.

Abstract: A pneumatic reciprocator includes a cylindrical air cylinder concentrically mounted within a cylindrical manifold. A cylindrical sleeve valve is concentrically mounted for movement along the manifold by a pair of spaced O rings. Two sets of circumferentially arranged air holes in the manifold are alternately covered and uncovered by the O rings as the sleeve valve is moved to selectively pressurize and vent opposite sides of the piston in the air cylinder. Movement of the sleeve valve is controlled by stops on the movable bed of a surface grinder that is controlled by the air cylinder.

Abstract: In the hydraulic breaker according to the present invention, oil pressure at a fixed value always flows in the circuit at a low pressure side whenever the piston is raised or lowered, to prevent the need for an accumulator in the circuit at the low pressure side. At the same time, a high pressure oil is required during the raising and lowering of the piston, bringing about less of a change in the surge pressure, attributing to the fact that there is no need for an accumulator in the circuit at the high pressure side. Moreover, the hydraulic breaker of the present invention is advantageous by providing an increased striking force because the high pressure oil is used, in addition to the reaction force of the compressed nitrogen gas, when the piston is lowered to strike the chisel.

Abstract: A hydraulic control valve having a valve housing including a cylindrical valve bore, the valve bore being in communication with a supply port, a discharge port and first and second delivery ports each with first and second openings to the valve bore. A valve pin is slidable within the valve bore, the valve pin including first and second pin grooves operable to establish communication between the supply port and either of the delivery ports to the exclusion of the other delivery port, the supply port and discharge port communication being establishable through corresponding valve bore openings of respective delivery ports. Supply port communication with one of the delivery ports is establishable simultaneously with discharge port communication with the other delivery port.

Abstract: A liquid motor is driven by pressurized wet glycol, received from an absorber of a natural gas dehydrating system, and utilizes the energy of the pressurized wet glycol to provide the primary source of energy for operating a pump for pumping of dry glycol from a reboiler to the absorber. A gas driven motor regulates the stroking rate of the glycol driven motor. The liquid motor and pump each have a two stage double acting piston in cylinders with fluid intake and exhaust valving and passages to alternately fill and exhaust the motor cylinders while the opposing pump cylinders are simultaneously alternately filled and exhausted. A spool type valve rod, associated with the glycol driven motor, is operated by the gas driven motor to regulate the rate of reciprocation of the glycol driven motor and to provide a secondary source of energy therefor.

Abstract: A steam engine wherein the inlet and relief valves are subjected to balanced stresses and the pressure of steam is maintained above the critical point. The engine can be braked electrically, mechanically and with steam; the braking with steam takes place subsequent to the application of electrical and mechanical brakes. The engine is equipped with arrangements for venting the steam path prior to starting, for replenishing the supply of fluid in order to compensate for leakage through the valves and/or from the engine cylinders, and with a control system which partly opens the relief valves and closes the inlet valves in response to actuation of the steam brake.

Abstract: A hydraulically driven hammer is disclosed, along with valve actuation arrangements which operate to switch hydraulic forces on the hammer ram after preselected intervals following application of pressurized pilot fluid flows. These flows pass into a fluid accumulation chamber unitl a predetermined volume is accumulated after which continued pilot fluid flow produces valve actuation.

Abstract: In a hydraulic oscillator having a main body equipped with inflow and outflow ports wherein a vibratory member is actuated to cause self-excited vibration by pressurized oil passing from the inflow port inside an oil pressure chamber so as to generate alternating flow of oil under pressure at the outflow ports, said hydraulic oscillator characterized by resilient devices provided proximate both ends of the stroke of the vibratory member so as to regulate the displacement thereof.

Abstract: In a percussion tool a means is provided for delaying the manifestation, on a valve means sensitive to such change in pressure, of a change in pressure of the fluid applied to the hammer piston at one end thereof and which drives such hammer piston in its working stroke, the valve means being that means which serves to control the inlet and exhaust parts of the fluid circuit which applies pressure to the other end of the piston.

Abstract: A hydraulically driven hammer is disclosed, along with valve actuation arrangements which operate to switch hydraulic forces on the hammer ram after preselected intervals following application of pressurized pilot fluid flows. These flows pass into a fluid accumulation chamber until a predetermined volume is accumulated after which continued pilot fluid flow produces valve actuation.

Abstract: A uniflow steam engine of the multi-cylinder type wherein the cylinders are rotatably mounted within a jacket having a sinusoidal cam track therein. Extending through slots, the ends of which are the exhaust ports in the cylinders and into the cam track are cam followers which are mounted on the pistons for reciprocable movement therewith. At the head end of the cylinders there are apertures which rotate with registered cutouts in superimposed valve rings that control the flow of steam from manifolds at the head ends of each of the cylinders into the cylinders as the cylinders rotate. By adjusting the relative position between the valve rings, the length of time of steam introduced on each cycle may be adjusted and by concomitantly rotating both valve rings, the initial time for introduction of steam may be adjusted to alter lead or reverse torque.