Plural Pilot Valves Patents (Class 91/305)
  • Patent number: 10451054
    Abstract: A pump assembly. The pump assembly may comprise a motor portion for driving a fluid pumping portion via a piston. The motor portion may comprise: a spool and a spool housing assembly having a spool chamber. The spool may be disposed within the spool chamber. The spool may comprise an upper portion and a lower portion, wherein the diameter of the lower portion is larger than the diameter of the upper portion. The spool may also comprise: (1) two support groove portions for cradling two slide valves and (2) two spool bores, which are in fluid communication with the two slide valves. The piston of the pump assembly may comprise a valve stem having a valve stem bore and valve stem openings. The valve stem openings may be funnel-shaped or may inwardly slope into the valve stem bore to prevent or minimize cutting or shredding of a blown seal.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: October 22, 2019
    Assignee: Monkey Pumps, LLC
    Inventors: Ray Guccione, Richard Marcis
  • Patent number: 8087345
    Abstract: A reciprocating drive mechanism having a housing with upper and lower internal chambers with a spool slidably positioned inside the upper internal chamber. There is at least one fluid inlet and fluid exhaust communicating with the upper internal chamber and at least one slide valve positioned within the upper internal chamber and traveling with the spool. A piston positioned in the lower internal chamber divides the lower internal chamber into an upper and lower cylinder space. There is at least one fluid conduit communicating between the upper internal chamber and the upper cylinder space and at least one fluid conduit communicating between the upper internal chamber and the lower cylinder space. A valve stem is connected to the piston and includes a bore communicating with the upper internal chamber and an exhaust passage is positioned between the upper and lower internal chambers.
    Type: Grant
    Filed: April 17, 2008
    Date of Patent: January 3, 2012
    Assignee: Checkpoint Fluidic Systems International, Ltd.
    Inventors: Rusty Singer, Andrew C. Elliott
  • Patent number: 5556007
    Abstract: An air-operated spray gun for spraying two fluid components in proportional amounts has the fluids fed separately from a pair of fluid cylinders each containing a fluid-operated double-acting piston with the volumes of each cylinder being in accord with the desired proportion of the fluids. The fluids are fed from the cylinders through fluid flow control valves which are switchable between a first position for directing fluid from a fluid source into one end of its associated cylinder and out the opposite end of the cylinder to the spray gun and a second position for directing the fluid out of the one end of the cylinder to the spray gun and into the opposite end of the cylinder from the fluid source. Air control valves instantaneously switch the fluid flow control valves from one position to the other. Sensing devices operate the air control valves when the cylinder pistons reach the ends of their strokes.
    Type: Grant
    Filed: February 13, 1995
    Date of Patent: September 17, 1996
    Assignee: Mattson Spray Equipment, Inc.
    Inventor: Charles O. Breitsprecher
  • Patent number: 5520520
    Abstract: A double acting pneumatically operated pumping assembly for pumping viscous fluids, especially food stuffs, is provided. The piston has an enlarged central portion integral with reduced diameter end portions. Inspection means, for example vent ports, are provided between seals of each end portion so that any leakage of either pneumatic fluid or of viscous fluid is detectable. The pump is preferably of modular form, each module having flanged ends and hand-tightenable band clamps holding the flanges together for easy assembly and disassembly. A feature of the invention is an operating valve having pilot chambers at each end for control of the spool position. Movement of pilot pistons within the pilot chambers affects the pressure balance between ends of the spool. Changes in pressure may be derived from the piston chamber of the pump from ports located to change the pressure balance of the valve when the pump piston has completed its stroke.
    Type: Grant
    Filed: March 28, 1995
    Date of Patent: May 28, 1996
    Inventors: Tomijiko Nakamoto, Alberto Nielsen
  • Patent number: 5366353
    Abstract: The air valve on a reciprocating pneumatic pump bleeds air from the pressurized air chamber into the exhaust port through a hole in the valve cup in order to warm the exhaust port area and prevent ice build up in the area. Such construction is also suited for use in spool valves.
    Type: Grant
    Filed: April 13, 1994
    Date of Patent: November 22, 1994
    Inventor: Kent P. Hand
  • Patent number: 5297469
    Abstract: An improved fluid power actuator assembly comprising a power piston reciprocatingly mounted in a cylinder bore which is formed in a compact fluid power manifold providing the necessary circuit connections between control valves mounted on the housing and the cylinder bore. The cylinder bore preferably includes two circumferentially spaced signal ports disposed in the wall of the cylinder bore along the path of travel of the piston in addition to the primary power ports located at each end of the cylinder bore to drive the piston. The piston includes at least one circumferential groove and functions as a spool valve for opening and closing communication between the signal ports as the piston travels in the cylinder. Appropriate control valves and signal pressure communicating with the signal ports is disclosed to enable a fluid power signal to be generated which is related to the position of the piston during its travel in the cylinder bore.
    Type: Grant
    Filed: February 23, 1993
    Date of Patent: March 29, 1994
    Inventor: Robert E. Raymond
  • Patent number: 5240042
    Abstract: A control logic circuitry comprising a toggle type fluid actuated pilot control valve which is activated by a fluid pressure signal pulse to shift between a first and second state to deliver a control signal to a main power control valve. The pilot control valve and associated circuitry includes the capability to maintain itself in either one of the shifted states after termination of the pressure signal pulse until actuated to the other state by another pressure signal pulse. The pilot control valve is described in connection with controlling the functions associated with a linear fluid power piston including switching a main power valve to reverse the piston stroke.
    Type: Grant
    Filed: October 1, 1992
    Date of Patent: August 31, 1993
    Inventor: Robert E. Raymond
  • Patent number: 4870891
    Abstract: A double acting piston and cylinder air motor with pneumatically actuated pilot valves for shifting a directional control valve, where the pilot valves are controlled by pilot ports in the cylinder as they are uncovered by the piston.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: October 3, 1989
    Assignee: Stewart Warner Corporation
    Inventors: Jerry D. Shew, Stuart A. Evans
  • Patent number: 4571939
    Abstract: A hydraulic well pump for operating a pump sucker rod string including a hydraulic cylinder assembly for raising and lowering the sucker rod string and a fluid counterbalancing system for offsetting the combined weight of the reciprocating service equipment, the fluid column above the pump plunger, and the sucker rod string. One counterbalancing embodiment includes an air supported piston on the movable cylinder exposed to an air chamber below the air piston functioning independently of the hydraulic and power and logic system of the pump. Another counterbalancing system embodiment uses a hydraulic fluid accumulator connected into the system fluid power and logic for supercharging the hydraulic power pumps during the lift stroke and providing opposing force during the downstroke.
    Type: Grant
    Filed: December 14, 1982
    Date of Patent: February 25, 1986
    Assignee: Otis Engineering Corporation
    Inventor: William W. Dollison
  • Patent number: 4488473
    Abstract: A working head is adapted to impart reciprocal motion under a predetermined amount of force to a plunger through a working and return cycle and at a controllable rate of speed. A fluid circuit includes delivery and return lines extending between a source of fluid under pressure and the working head, and pilot control means associated with the fluid pressure source is operative to regulate the working and return cycle. The working head has a plurality of annular flexible casings of toroidal configuration with opposite sidewalls terminating in mutually opposed, inner bead-like edges and interconnecting means extending between the edges of adjacent casings serve to interconnect the casings in sealed, coaxially spaced relation to one another. Closures at opposite ends of the plurality of casings define a common sealed chamber therebetween. A support member fixes one end of the chamber against movement and permits axial expansion and contraction of the opposite end of the chamber with respect to the fixed end.
    Type: Grant
    Filed: February 12, 1982
    Date of Patent: December 18, 1984
    Assignee: Liquid Power, Inc.
    Inventor: Jimmie L. Gammon
  • Patent number: 4248136
    Abstract: The invention relates to a thrust device using a plurality of hydraulic jacks, and to the automatic control of a plurality of thrust jacks.Two differential jacks have resetting chambers which are permanently under hydraulic pressure. Associated with each jack there is a self-locking piloted valve placed in the active position by a push-rod at the end of a work stroke of the piston of the jack and restored into the inactive position by a piloted valve actuated by a push-rod 39 at the end of the return stroke of the piston to its starting position. In the active position the self-locking piloted valve controls the isolation from the supply of all the work chambers and the venting of the associated work chamber 14.
    Type: Grant
    Filed: August 7, 1978
    Date of Patent: February 3, 1981
    Assignee: Charbonnages de France
    Inventors: Guy Blanpain, Pierre Grandfils
  • Patent number: 4029440
    Abstract: A pressure intensifying apparatus to deliver a very high pressure stream of water through a nozzle. There is a single working piston having two pressure surfaces of a relatively large area, the working piston being connected to two high pressure pistons each having a pressure surface of a relatively small area. A control valve delivers a high pressure working fluid alternately to opposite sides of the working piston to cause it to reciprocate so that the pressure pistons alternately deliver water at high pressure to the nozzle.
    Type: Grant
    Filed: March 16, 1976
    Date of Patent: June 14, 1977
    Assignee: Flow Industries, Inc.
    Inventor: John H. Olsen