Abstract: A redundant accumulator system for delivery of pressurized hydraulic fluid to blowout preventers (“BOPs”) and other well equipment during coiled tubing and wirelining operations that has sufficient reserve fluid capacity to simultaneously operate a plurality of BOPs and other well equipment and to hold a plurality of BOPs closed in the event of a hydraulic fluid leak, and is appropriately sized for use aboard an offshore vessel or platform or for use in close proximity to an inland wellhead. The accumulator system includes a hydraulic fluid capacity that is at least twice the capacity of the accumulators, a plurality of pneumatically operated pumps in parallel, each having the maximum inlets and outlets for their size to maximize the charging capacity of the accumulator system and allow the system to be charged to operational pressure in less than thirty minutes.

Abstract: A vehicle brake device is provided with a master cylinder, a master piston slidably arranged in the master cylinder, an input piston slidably arranged in the master cylinder to be separated from the master piston and defining a separation chamber, an input piston moving amount detecting section for detecting the moving amount of the input piston, a master piston moving amount calculating section for calculating the moving amount of the master piston based on the moving amount of the input piston, and a contact inferring section for inferring the contact of the input piston with the master piston based on the moving amount of the input piston and the moving amount of the master piston.

Abstract: In a hydrostatic transmission (HST), a lubricating fluid passage is formed in an input shaft and has a pair of radially opposite lubricating fluid spill ports open at an outer peripheral surface of the input shaft. Both of the radially opposite lubricating fluid spill ports face a lubricated object of the HST. The lubricating fluid passage includes an axial fluid passage and a pair of radial fluid passages that are extended radially from the axial fluid passage to the outer peripheral surface of the input shaft so as to be radially opposite each other. Open ends of the respective radial fluid passages at the outer peripheral surface of the input shaft serve as the respective radially opposite lubricating fluid spill ports.

Abstract: Disclosed is a hydraulic circuit for controlling booms of construction equipment, wherein working oil which is relieved from a large chamber of a boom cylinder passes through an orifice so as to prevent the boom from lowering if an overload is applied when the boom is not being operated.

Abstract: There is provided a hydraulic excavator in which occurrence of minute vibrations in a control lever can be suppressed. A boom-raising proportional solenoid valve is provided in a boom-raising pilot conduit. A boom-lowering proportional solenoid valve is provided in a boom-lowering pilot conduit. A controller controls an opening degree of the boom-lowering proportional solenoid valve based on a pressure generated in the boom-lowering pilot conduit between the control lever and the boom-lowering proportional solenoid valve, and controls an opening degree of the boom-raising proportional solenoid valve. An amount of increase in current per unit time when the controller outputs, to the boom-lowering proportional solenoid valve, an instruction signal for instructing an increase in opening degree is smaller than an amount of increase in current per unit time when the controller outputs, to the boom-raising proportional solenoid valve, an instruction signal for instructing an increase in opening degree.

Abstract: A hydraulic power unit comprising a rear face and a front face spaced from one another includes an air inlet configured to receive air into the unit, and an air outlet configured to expel the air received into the unit. The hydraulic power unit further includes controls configured to provide a user interface. The controls and the air inlet are located on the front face, and the air outlet is located on the rear face. A coupler for a hydraulic power unit, configured to couple a drive shaft of the unit to a pump shaft of a hydraulic pump, includes a first aperture configured to receive the drive shaft, a second aperture configured to receive the pump shaft, and a hub configured to be received in a fan. The hub is configured to fixedly couple to the fan so that the fan is driven by the drive shaft.

Abstract: An apparatus for accommodating fluid expansion and contraction within an axle housing or axle support structure of a hydrostatic transaxle is provided. A partitioning element separates the hydraulic fluid from an air chamber created at least partially by the partitioning element and the partitioning element has an internal volume that is in communication with the primary sump and the partitioning element expands to increase the size of its internal volume and thereby expand the volume of the sump.

Abstract: A hydraulic control valve assembly (10), method and system, characterized by control valves (26) each having a variable metering orifice; a compensator (28) that controls flow of fluid from the variable metering orifice to a work port (A,B) in response to a differential in pressures acting on opposite first and second sides of the compensator, wherein a first side receives a pressure at the downstream side of the variable metering orifice; a load sense passage (34) providing a load sense pressure; and a differential pressure controller (40) having a first inlet connected to a pump supply port and a second inlet connected to the load sense passage, the controller having a first operational mode in which load sense pressure at the second inlet is supplied to an outlet of the controller and a second operational mode in which flow from the first inlet is metered to the outlet of the controller to provide a differential control output pressure, and wherein an outlet of the differential pressure controller is conne

Abstract: A retaining system for securing a closure at an installed position within a bore. The bore being in a portion of a housing and having screw threads along at least a portion thereof. The closure having an internally threaded hold extending therein. The closure in the installed position closes the bore. The retaining system comprising a retaining cover for obstructing removal of the closure from the bore. The retaining cover being receivable in the bore in a position generally adjacent the closure. The retaining cover having external threads interengageable with the screw threads of the bore such that the cover is rotatable relative to the housing in a tightening direction for movement of the cover into the bore toward the closure and rotatable in an opposite, loosening direction for movement of the cover out from the bore away from the closure. The cover having a central axis of rotation.

Abstract: A hydrostatic transmission including a main pump, two main ducts serving respectfully as feed and as discharge for first and second hydraulic motors that serve to drive disposed one after the other. A bypass valve can take up a reduced-speed position in which the feed main orifices are connected to the discharge main duct, and an increased-speed position in which one of the motors is bypassed, the feed main orifice of the motor being connected to the discharge main duct via a bypass link, while the other main orifices continue to have their respective links. The apparatus further includes a constriction suitable for being activated to restrict the flow of fluid through the bypass link.

Abstract: Pump assembly for the lift cylinder of a hand fork-lift truck includes a piston pump activated by a bar of a hand fork-lift truck and has a piston chamber and an annulus collector. A three stage control valve connects the lift cylinder with a tank in the lowered setting and connects the piston chamber with the tank in a neutral setting and in a pump setting, connects the piston chamber with the lift cylinder through a first check-valve, with the tank through a second check-valve, a third check-valve between the piston chamber and the annulus collector open to the piston chamber, and a reversing valve between the piston chamber and the annulus collector.

Abstract: This is a dynamic system for refrigeration equipment. This invention provides special features, including a set of mechanisms, electro-mechanisms, and electronic controls for refrigeration compression chambers or other kinds of fluids that employ two, three, or four compression chambers. There is extremely low vibration, noise, cost, and energy consumption in this equipment. It does not overheat and has a reduced size, lightweight and requires less raw materials to build it. There are other advantages in its technical aspects. It can be run on an electric motor or only with solenoid coils for traction. The applications include, but are not limited to, refrigerators, freezers, air conditioners, cold stores, refrigerated trucks, compressors for automotive air-conditioning, etc. Other applications include those that normally require a piston (piston-air compressor or diaphragm compressor to fill tires, spray painting, etc . ).

Abstract: A cylinder liner and ringless piston adapted to be combined therewith in an internal combustion engine are provided that have superior wear resistance, superior scuffing resistance, and superior properties for abating friction loss between the inside surface of the cylinder and the sliding surface of the ringless piston. These embodiments can also include a cylinder liner which has at least some portion of the inner circumferential surface coated with an iron oxide film, a metallic nitride film, or other physical vapor deposition or chemical vapor deposition film, combined with a ringless piston with at least some portion of the exterior surface being coated with a metallic nitride film or other vapor deposition film.

Abstract: A die drive unit has a cylinder mechanism which hydraulically drives a piston member and an additional drive mechanism which drives the piston member by means of a drive source other than a hydraulic one. A first oil chamber is formed on one side of the piston member. A second oil chamber and a third oil chamber are formed on the other side of the piston member. The first oil chamber and the second oil chamber are connected to each other by an oil passage. The piston pressure receiving area of the first oil chamber is equal to the sum of those of the second and third oil chambers.

Abstract: An apparatus for angularly positioning a shaker bed, including a discharge end, includes an air source providing pressurized air, an hydraulic tank in selective communication with the air source and containing a quantity of fluid, at least one bellow in selective fluid communication with the hydraulic tank, and a lift control assembly controlling communication of pressurized air between the air source and the hydraulic tank and controlling communication of fluid between the hydraulic tank and the at least one bellow.

Abstract: A fluid pressure cylinder can apply a fastening force to an axially movable reciprocating rod. A reciprocating rod 13 is mounted in a case main body 10 so as to be reciprocable in a forward direction and a backward direction, and two lock units 16a and 16b are incorporated in the case main body 10, and the lock units 16a and 16b include: lock sleeves 18a and 18b mounted axially movably and having taper surfaces 22a and 22b; and retainers 19a and 19b holding steel balls 21a and 21b that are fitted in the reciprocating rod 13 axially movably and engaged with the taper surfaces. A fastening cylinder 41 that contains a fastening rod so as to be reciprocable in a fastening direction and a fastening release direction is attached to the case main body 10, a fastening surface 44 contacting with the lock sleeves 18a and 18b being formed in the fastening rod, and the reciprocating rod 13 is fastened by the two lock units 16a and 16b.

Abstract: An embodiment of the present invention involves a zero turn drive apparatus. The zero turn drive apparatus has a housing, which has a first and a second end. The housing has a first end cap mounted on the first end of the housing, and a second end cap mounted on the second end of the housing. A hydraulic pump is rotatably mounted on each end cap, and each hydraulic pump is driven by a pump input shaft. A gear chamber is interposed between each pump. A power take off mechanism is engaged to the housing, and an output shaft extends from the power take off mechanism. An input shaft, which is engaged to each of the pump input shafts, extends into the power take off mechanism and is selectively engaged to the output shaft.

Abstract: An electrically actuated brake booster capable of obtaining a desired boost ratio for a given input pressure when an electric actuator is activated as a boost source, so as to ensure a desired operability of a brake pedal. The electrically actuated brake booster comprises: an input piston 22 to which an input thrust is applied through an input rod 9 that moves in coordination with operation of a brake pedal 8; and a booster piston 21 to which a booster thrust is applied by an electric actuator 40 that uses an electric motor 41 as a drive source, such that the input piston 22 and the booster piston 21 are disposed to be movable relative to each other but are normally maintained in a neutral position of relative displacement by means of springs 34. While an amount of relative displacement between the pistons 21 and 22 is determined by the potentiometer 45, the electric motor 41 is controlled to adjust the amount of relative displacement to a predetermined value.

Abstract: Spacers for use with actuator casings are disclosed. An example spacer includes a ring-shaped member defining a central opening and configured to form a part of an actuator casing and to space first and second actuator casing portions a predetermined distance when the first and second casing portions are coupled to the ring-shaped member. The ring-shaped member includes a first surface surrounding the central opening configured to engage the first casing portion and a second surface surrounding the central opening configured to engage the second casing portion. Each of the first and second surfaces includes a plurality of apertures configured to receive threaded fasteners to attach the first and second actuator casing portions to the ring-shaped member.

Abstract: The invention relates to a rotating or pivoting device (110) comprising a housing (12), at least one working piston (14) which is mounted in the housing and subjected to a pressure medium, and a pivoting part (20) which is rotatably mounted in the housing and is rotatably driven by the working piston by means of a rotating coupling mechanism, the working piston being mounted in the housing in such a way that it can be displaced in a housing-side cylinder, The inventive rotating or pivoting device also comprises an abutment part (114) that limits the stroke of the working cylinder in at least two positions and can be locked at least in its axially inner intermediate position.