Abstract: Methods and systems for preventing direct and indirect electronic attacks, cyber attacks, and/or minimizing the impact of high voltage pulses are disclosed. In an aspect, an example system can comprise an electromagnetic plasma disrupter device. The electromagnetic plasma disrupter device can comprise a gas pressurized enclosure such a waveguide, grounded metal enclosure, or Faraday shield having a first pair of opposed electrodes at least partially enclosed in the enclosure. A first electrode of a first pair of the opposed electrodes can be connected to ground. A second electrode of the first pair of opposed electrodes can be coupled to a voltage source. The system can optionally comprise a second pair of opposed electrodes. The second pair of electrodes can allow, under normal operation, for signals to enter and leave an electronic circuit that is being protected.

Abstract: Hydraulic machine, in particular hydraulic motor, comprising a casing, a differential piston (4) having a region of large cross section and a region of smaller cross section, which can slide with a reciprocating movement respectively in the casing and in a housing coaxial to, and of smaller diameter than, the casing, the piston separating two chambers of the casing and being provided at the location of its large cross section and its small cross section with sealing lips (48, 49) which are oriented in opposite directions and which face one another. The sealing lips (48, 49) are provided on detachable circular rings (50, 51), and the piston (4) is molded in one piece.

Abstract: Some embodiments of the present invention provide a spool valve having a spool axially movable within a sleeve of two or more stacked rings having projections extending therebetween. One or more seals on the spool can slide across surfaces of the stacked rings in movement of the spool to different positions corresponding to different states of the valve. In some embodiments, one or more of the stacked rings can have projections extending toward and contacting an adjacent ring of the sleeve, thereby maintaining desired axial positions of the rings relative to one another while providing apertures through which fluid can flow and supporting surfaces for each seal as it slides from one ring to another.

Abstract: A fluid energized double acting motor is provided for use as the drive for reciprocating mechanisms such as paint pumps for airless spray painting. A piston within the pump housing is moved by pressurized fluid controlled by an automatic reversing valve including spaced check valves. The check valves are selectively seated and unseated by a spring biased piston and fluid pressure controlled valve actuator assembly. The reversing valve system includes anti-stalling features and is of single, low cost, field repairable nature. The motor system also includes features to prevent chattering oscillation due to abrupt changes in motor load.

Abstract: A reciprocable device comprising a reciprocable member mounted for reciprocating movement within a chamber and a valve system for controlling the supply of fluid under pressure to the reciprocable member to bring about reciprocation of such member. A motor is enabled by the reciprocable member to operate the valve system whereby at least some of the force for driving the valve system is obtained from the motor and not from the reciprocable member.

Abstract: A vacuum actuator, suitable for use in an automatic belt tensioning system, oscillates automatically when connected to a source of constant vacuum.

Abstract: A reciprocation valve for a hydraulically actuated reciprocation motor, wherein the motor has hydraulic inlet and outlet passages into a cylinder through a porting block, and a slidable collar is fitted over the porting block for selectively opening and closing the passages, and a lightweight carriage assembly is attached to the collar and is actuated by a trip rod coupled to a piston within the cylinder.

Abstract: Pressure converting apparatus which automatically and continuously converts low pressure fluid into high pressure fluid comprises low pressure and high pressure cylinders which are coaxially connected, but have different effective bore areas, a co-working piston rod which reciprocates in the chambers of the coaxial cylinders, an automatic pilot valve operating mechanism disposed at the rear end of the low pressure cylinder, and a fluid supply mechanism for supply a bypassed fluid into the high pressure cylinder. Due to the difference in effective bore areas of the low pressure and high pressure cylinders and the automatic reciprocation of the coaxial piston rod in the chambers effected by the automatic pilot valve operating mechanism, high pressure fluid is constantly produced at the high pressure cylinder as the low pressure fluid is continuously supplied into the low pressure cylinder.

Abstract: A piston-cylinder combination having a piston arranged for reciprocating movement within a cylinder under fluid pressure, the fluid pressure being ultimately delivered to the sides of the piston with a connector rod from the piston controlling the movement of valves for the delivery of fluid to the piston. The fluid valves are alternatively exposed to fluid under pressure to insure proper opening and closure thereof. The valving combination from the alternate sides of the piston eliminates chattering or floating of the piston, particularly when the piston is under a "no load" condition.

Abstract: A hydraulic valve mechanism for a hydraulic motor having a cylinder and a piston reciprocating therein, comprising a valve block having a valve face, a main and an auxiliary central exhaust ports, two main feed ports on opposite sides of the main exhaust port, and two auxiliary feed ports on opposite sides of the auxiliary exhaust port. A valve chest is sealed over the valve face and has aligned piston-receiving bores at its opposite ends, a chamber for pressurized hydraulic fluid between the bores and a valve-actuating piston slideable in the bores. A main D-valve and an auxiliary D-valve operable by the valve-actuating piston move within the chamber in sliding sealing engagement with the valve face. The main D-valve covers and uncovers the main exhaust port and main feed ports to control the reciprocation of the motor piston.

Abstract: A fluid pressure servo detent mechanism for controlling movement of a piston within a cylinder including one-way inlet and outlet valves for controlling the fluid pressure within the cylinder with linkage means interconnecting the inlet and outlet valves and the moveable piston for simultaneously actuation thereof. A control or sensing rod is carried by the piston for movement therewith to provide a control element for articles to be controlled or to sense the position of the piston and the flow of fluid or receipt of pressure to the outlet may be utilized to determine the position of the piston and as a signal to additional equipment.

Abstract: A solar energy device for producing a continuous mechanical motion to drive apparatus such as a well pump comprises a frame made of conduit sections that supports a heat collector to receive the sun's rays. Heat generated within the collector is transferred to a network of conduits therein through which an evaporatable fluid is circulated as it is heated to its vaporous state. The vaporized fluid or gas is furnished to a vapor pressure motor having a common connection to the conduit network. The motor is situated within the collector and has a movable piston operated by its own valving system that produces a continuous reciprocating action. The piston is connected to an output shaft that engages a working lever arm connected to the pump. Vapor used to operate the motor is conveyed to a condenser within the frame where it is cooled to its liquid state by water produced by the well pump which is forced through the frame.

Abstract: There is disclosed a torque wrench, including a main body, an actuator including a piston/cylinder arrangement and cooperating spool valve which selectively supplies pressurized fluid to either side of the piston member. The actuator is supported in the main body and adapted to act upon and selectively reciprocate a thrust member relative to the main body, the thrust member being adapted to engage and pivot a torque arm for providing a torque output at an output shaft via a ratchet arrangement incorporated between the torque arm and the output shaft. The torque arm is supported independently of the thrust member and is not physically connected thereto.

Abstract: The invention relates to apparatus for and the method of reversing the operation of a power piston in a power cylinder automatically to pump oil, corrosive or wax bearing fluids. The flow of high pressure fluid driving the piston in one direction may be reversed to drive the piston in the opposite direction at the end of the respective strokes by establishing a collapsible chamber for the high pressure fluid within the piston. This chamber is at least partially collapsed toward the end of each stroke by the stem of an auxiliary reversing piston striking a stop slightly before the end of the stroke to partially collapse said chamber and establish a further chamber on the opposite side of the reversing piston.

Abstract: A piston type, pneumatically powered motor includes a valve assembly for reversibly supplying pneumatic fluid to opposite sides of a piston to reciprocate the piston through power strokes in both directions. The valve assembly has a spool reciprocably mounted in a sleeve that normally moves between two positions to reversibly supply pneumatic fluid to the piston. An actuating mechanism shifts the valve spool between its two normal positions responsive to movement of the piston near the end of each power stroke. When the reciprocation rate of the piston reaches a predetermined high or excessive rate, the actuating mechanism shifts the valve spool to a third position that short circuits the normal path of the pneumatic fluid flowing to the piston and channels the pneumatic fluid to an exhaust port.

Abstract: This invention relates to a linear hydraulic motor or actuator, more especially to a hydraulic motor in combination with a piston pump, serving to inject liquid fertilizers into a water pipe line.