Abstract: A valve actuator is provided which clamps to the axially extending assembly bolts of the valve or to ribs on the valve body simulating the bolts. The actuator has a support frame with ears which seat over a pair of the bolts or ribs and by means of stops formed by recesses in the ears seat the support frame on the bolts or ribs and threaded anchor members, when tightened, cause the ears to tightly clamp to the bolts or ribs, preventing either lateral or axial movement with respect to the valve body.

Abstract: An air damper having a housing, a strut mounted across the housing, a pair of damper panels hinged on the strut, and swingable between open and closed positions, an adjustable control above the strut, and, linkage on the upper side of each panel extending to the control to cause the panels to swing from one position to the other.

Abstract: A remote-control apparatus for opening or closing a container is disclosed, which includes a rotary drive mechansim, an operable shaft driven by the drive mechanism, and a drive wheel mounted on the operable shaft, the drive wheel being held on the operable shaft by a collar. The drive wheel has at one end teeth members which engage notches formed in the peripheral edge of a valve wheel of the container. When the drive mechanism is activated, the operable shaft turns the drive wheel, which causes the valve wheel of the container to turn, thereby causing the valve of the container to either open or close.

Abstract: Control device for a braking corrector (10) capable of being imposed between a source of hydraulic pressure and a motor vehicle braking circuit, of the type incorporating a casing (12) provided with at least one bore (14, 14') a plain or differential hydraulic piston (16, 16') sliding in the bore (14, 14') and defining in it a first pressure chamber (18, 18') and a second pressure chamber (22, 22') which are capable of being joined to the source of pressure and to the braking circuit, respectively, the piston (16, 16') controlling the flow of a fluid under pressure between the chambers, the control device incorporating a pilot piston (48) for fluid capable of generating a pilot force (Fp) upon the hydraulic piston (16, 16') so as to push the latter toward the inside of the casing (12) in the direction in which the flow of fluid is established, the fluid under pressure generating a reaction force (Fr) pushing the piston (16, 16') toward the outside of the casing (12) in the direction in which the flow of fluid

Abstract: In a replacement faucet handle kit of simple and inexpensive form there is included a plurality of adapters each having a first end portion and a second end portion.

Abstract: The invention comprises an improved override and an interrelated valve system. A main valve has an actuator, the actuator in turn having a control for communicating a control signal to the actuator for selectively causing the actuator to place the main valve in its open or closed position. The override is associated with the main valve and selectively shiftable between an engaged mode in which the override is operatively connected with the main valve for moving the main valve between its open and closed positions, and a disengaged mode in which the operative connection between the override and the main valve is interrupted, whereby the main valve may move independently of the override. A shut-off functionally interconnects the override and the actuator control and is operative, upon shifting of the override to its engaged mode, to block the control signal from the actuator.

Abstract: A closing and filling unit having a piston valve (22) whose closure member (28) is provided with axial openings. A rotatable and slidable element (32) is provided for actuating the valve. Arrangements (35, 40, 41, 33, 36) are provided for utilizing the pressure of the fluid to force the element (32) into engagement with the piston (28). The device is adapted to be detachably fixed to the body of the valve by means of a screw-threaded boss through which extends an actuating rod (37) which is rigid with a piston (36) sliding in a chamber (33).

Abstract: A zone valve of the type using a heat motor includes a biasing spring that operates on a lever, the lever operating on a valve. The spring includes arms that slidingly engage the lever. The arms each include a bent portion adjacent the point of contact with the lever. By providing the bent portion on each arm, the effective biasing force produced on the lever is decreased when the lever is in a raised position.

Abstract: An actuator is mounted on a valve body by a threaded nut. A ring gear on the nut is engaged by a manually operated spur gear for threading the nut on or off the valve body with a mechanical advantage.

Abstract: A high pressure free floating ball valve wherein a pair of operating stems interconnect with slots on the hall to allow relative movement there between.

Abstract: A carburetor comprising a fuel/air induction passage, a secondary orifice communicating with the induction passage, and a fuel supply system operable to supply fuel from a source of fuel to the secondary orifice, the fuel supply system including a wall defining an elongated enclosed chamber having a longitudinal axis and a first end, the wall including an inlet communicating between the source of fuel and the chamber, and, at the second end, an outlet communicating between the chamber and the secondary orifice, the outlet including a valve seat, a valve member within the chamber and including a needle portion adapted to engage the valve seat, the valve member being movable within the chamber along the longitudinal axis of the chamber relative to a closed position wherein the needle portion sealingly engages the valve seat, a spring biasing the valve member toward the closed position, and an adjustment rod selectively engageable with the valve member for selectively and releasably moving the valve member away

Abstract: A tamperproof fire hydrant which can only be operated with the use of a special operating tool thus preventing the opening of the hydrant by unauthorized persons for unauthorized use. Additionally the tubular hold-down nut for the operating nut is so designed to prevent unauthorized disassembly of the hydrant by unauthorized personnel. To prevent unauthorized use or unauthorized disassembly the polygonal shaped operating nut is concealed by a dome shaped cap covering both the hold-down nut and the operating nut, the cap being freely rotatable with respect thereto. The dome shaped cap permits only limited access to the operating nut. Additionally the hold-down nut for the operating nut is also protected in this manner and is provided with a specifically shaped outer surface which requires a special tool usable only when the dome shaped cap for the operating nut is removed.

Abstract: A handle assembly for attaching a decorative handle to a turning stem is disclosed. The handle can be placed on, as well as removed from the stem by a straight axial motion (without turning the handle). In one embodiment, the stem adapter is secured to a valve stem and has an angled shoulder surface and an undercut portion. An attachment screw is employed to secure the stem adapter to the valve stem. The handle adapter has a multiplicity of resilient finger members with terminal portions adapted to engage both the angled shoulder surface and the undercut portion of the stem adapter. A handle member of a generally U-shaped configuration has a retainer member secured therein with the retainer member having finger engaging portions.

Abstract: A tamperproof fire hydrant which can only be operated with use of a special operating means or tool thus preventing the opening of the hydrant by unauthorized persons for unauthorized use. The hydrant is provided with the usual polygonal end portion of the rotatable operating nut extending out of the top closure member. A dome shaped cap is mounted on the polygonal end portion of the operating nut for free rotation relative thereto, the dome shaped cap having a skirt with the lower edge thereof spaced from the tubular hold down nut or top closure member of the fire hydrant to provide a limited access space to the polygonal end portion for reception of the special operating means. The special operating means is also capable of being used as a tool to remove the nozzle cap off of the usual nozzle and to install the hose coupling on the nozzle.

Abstract: In a zone valve, an improved arrangement for connecting the operator unit to the valve unit is provided. A one piece wire locking spring carried by the operator unit in conjunction with a groove on the valve unit valve plug provides a snap connection.

Abstract: A manually operable valve apparatus capable of temporary attachment at one end directly to a refrigeration apparatus which is to be charged with a pressurized refrigerant, such as from a portable source of refrigerant, the present valve apparatus can be attached at its opposite end to a hose or the like to communicate with a pressurized source of refrigerant. The valve comprises an internal spring-loaded valving element having pins at each end which each contact a needle element at opposite ends of said valving element. One of the needle elements is directly biased by a cam twisted by finger manipulation against one of the pins of the valving element to displace against spring pressure the other pin, thereby displacing the other needle element to allow pressurized refrigerant to flow from the refrigerant source through the valve apparatus.

Abstract: A disc-shaped inner member engages the valve stem. The inner member has a smooth uninterrupted exterior surface, except for a pair of spaced conical projections. An annular outer member is freely rotatably mounted around the inner member and has two peripheral slots. The actuator has a cap assembly receiving cavity including a pair of conical recesses adapted to engage the projections. Inwardly extending parts from spaced side portions are adapted to pass through the peripheral slots in the outer member and lodge thereunder to permit rotation of the valve stem.

Abstract: A valved dispenser for use with a pump and tap assembly, for dispensing kegged beer and other beverages alternatively in the manner of a fountain dispenser or in the manner of a hand held dispenser, includes a first handle and portion of a cam actuating arrangement suited to hand held operation, and a second handle used in conjunction with the first handle and another portion of the cam actuating arrangement as well as retaining coupler elements on the pump and tap assembly and valve for effectively converting the dispenser to the fountain type. To reduce foam generation while dispensing, a stem guide is formed to permit fluid passing through the valve to flow around the guide for reduced flow velocity. A threaded valve seat element and push-back stem with ready access to a key pivot pin are included for simplified valve disassembly for cleaning and maintenance.

Abstract: A drilling choke for controlling flow of drilling fluids from a well comprising: a body having an inlet and outlet and an intermediate cavity therebetween; a seat member coaxially disposed in the body outlet; an operator assembly removably attached to the body; and a stem assembly connected to the operator assembly for axial movement thereof. A portion of the stem assembly is removable, upon removal of the operator assembly from the body, without otherwise disturbing the operator assembly.

Abstract: A large manually operated leak-proof corrosion-proof low-cost shut-off or stop valve for handling high pressure refrigerant liquids and/or gases comprises a valve body formed of two sheet metal hemispheres welded to the periphery of a circular metal valve plate having a fluid passage therethrough and hollow cylindrical metal tubes welded to the hemispheres along the edges of circular holes cut in the hemispheres. The cylindrical outer end of a valve spindle extends into a cylindrical bore in the hub of a hand-wheel which is rotatable to open and close the valve. The hand-wheel is secured to a valve spindle by a removable flanged roll pin which fits into a pin hole formed by mating or registering recesses formed in the periphery of the outer end of the valve spindle and in the peripheral wall of the bore in the hub of the hand-wheel. Unscrewing of the bonnet affords access to the sealing materials and, as the bonnet moves axially, it also shifts the hand-wheel off of the outer end of the valve spindle.

Abstract: This invention provides for a quick-disconnect coupling and valve assembly which consists of a single-service coupling and valve assembly and a connector for cooperating therewith. The single-service coupling and valve assembly is comprised of two main parts, namely, a spout fitment for a flexible bag and a valve member which slidably fits within the spout for axial movement. The valve member is provided with an outwardly-opening socket for receiving the connector and this socket has at least one dispensing outlet in the base thereof. In use, the valve member is normally in closed position with the outlet disposed within the spout axially-outwardly of an inner seal between the spout and valve member. A one-way stop arrangement permits axial inward movement of the valve member relative to the spout but prevents axial outward movement, the inward movement opening the valve by moving the outlet inwardly beyond the spout.

Abstract: In accordance with the present invention, an unloading assembly for a top operated lading valve is disclosed. The unloading assembly includes means for connecting an unloading outlet chamber to the existing depending valve outlet chamber of the lading valve. The unloading outlet chamber is hollow and is in fluid communication with the lading valve outlet chamber. The unloading assembly includes an operating shaft extending upwardly through the unloading outlet chamber and through the valve outlet chamber. The operating shaft includes a non-round connection portion adapted to engage a non-round connection portion of the top operating rod.

Abstract: An actuator for use with an aerosol container including a depressor bar having opposite hooks at the ends thereof embracing oppositely projecting annular walls of the container. The upper hook includes a retainer at the distal end of a spring finger portion thereof configured to retain the depressor bar in spaced relationship to the container while permitting inward urging of the depressor bar to urge the distal end of the retainer against the spray nozzle for actuation thereof.

Abstract: A quick-disconnect service-line connector assembly for use in a beverage dispensing system or the like for connecting the service line to a single-service coupling and dispensing spout valve assembly on a flexible bag containing a liquid or semi-liquid product to be dispensed. It comprises a clamp which permits quick application to and removal from the spout of the single-service assembly and the clamp carries a guide structure for mounting a plug or nozzle body assembly for axial movement relative to the spout for insertion into the closed dispensing spout valve member carried therein for pushing it into opened position and simultaneously gripping it so that, as it is withdrawn, it moves the dispensing spout valve member again into closed position. In the nozzle body is a normally-closed flow control valve which is positively opened when the nozzle is inserted into the dispensing spout valve and which is automatically closed as it is withdrawn therefrom.

Abstract: A magnetically locked fluid valve having a particular utility in a fire hydrant to prevent unauthorized usage thereof. The fire hydrant includes an operating nut mounted on top of one end of a hydrant actuator shaft, and a magnetic lock is located in immediate proximity thereto. A shaped magnet is adapted to be placed around the actuator shaft adjacent to the magnetic lock, after which a wrench can be applied to the operating nut to control operation of the fire hydrant. The magnetic lock includes magnetic tumblers which are shifted in position in response to placement of the magnet on the actuator shaft. The actuator shaft includes an upper section coupled to the operating nut and a lower section coupled to the hydrant valve. The magnetic lock is positioned between the upper and lower shaft sections, and the upper shaft section is freely rotatable relative to the lower section when the magnet is removed, but is locked relative thereto when the magnet is positioned thereon.

Abstract: An evacuating-charging valve assembly consisting of a valve permanently mtable onto a fluid system such as an air conditioning system and a connecting head temporarily attachable to the valve. Two embodiments are shown, in both of which the valve has a flange portion for mounting to the fluid system, and a boss portion. Each boss portion is internally bored and threaded and has a ball-ended setscrew, with the ball against the end of a hole through the flange. In one embodiment, the setscrew has slots through its threads, and the connecting head screws into the boss. In the other embodiment, holes are bored through the boss and the connected head screws onto external threads on the boss. Both connecting heads have a setscrew wrench inside, and an external knob for rotating or linearly moving the wrench, and have passageways through them to an external hose connection. When the setscrews are unscrewed, a fluid passageway exists between the hole through the flange and the external hose connection.

Abstract: A valve body has a chamber with a lower portion provided with inlet and outlet openings and an upper portion that includes a diaphragm seat having a surface with a presclected degree of roughness. An assembly of individual flexible metallic diaphragms is positioned in a stacked arrangement a graphite gasket positioned on the roughened diaphragm seat. A bonnet bolted to the valve body applies a downward bearing force upon the outer annular edge of the diaphragm assembly to secure the diaphragm assembly and gasket in sealing relation with the valve body to seal the chamber upper portion from the chamber lower portion. A yoke member is secured to the valve body in surrounding, spaced relation with the bonnet. A valve member has a disc portion arranged to move into and out of abutting relation with a valve seat of the valve body to control the flow of fluid under substantial pressure through the chamber.

Abstract: A blowout preventer having a body with a bore and opposing guideways intersecting the bore, a ram in each of the guideways, a cap closing the outer end of each of the guideways, an operating stem connecting to each of said rams, extending through its cap in threaded engagement and having means for engagement by a handle, such as flats on its outer end, a pair of hydraulic motors each having a housing and a rotating shaft, means for securing said motor housings to the body surrounding said guideways, means for connecting said drive shafts with the operating stems to rotate said stems, and means supplying hydraulic fluid to said motors for selective rotation of said shafts and said stems in preselected directions.

Abstract: A tank vehicle lading valve assembly is provided including a lading valve mounted in an opening in the bottom of the tank which is movable vertically between open and closed positions. A valve housing or outlet chamber including an unloading spout is attached below a tank bottom mounting flange with fasteners, which preferably define a shear plane. A first operator attached to an upper portion of the lading valve extends vertically up through the tank to the upper portion of the tank where it is adapted to receive a suitable handle or tool to move the lading valve between open and closed positions. A second operator is preferably attached to a lower portion of the lading valve. The second operator portion preferably extends at least partially through the valve housing. Thus the lading valve is operable from either the top of the tank or from the bottom of the tank. The first operator may be eliminated and the lading valve operated from the bottom.

Abstract: A tank vehicle lading valve assembly is provided including a lading valve mounted in an opening in the bottom of the tank which is movable vertically between open and closed positions. A valve housing or outlet chamber including an unloading spout is attached below a tank bottom mounting flange with fasteners, which preferably define a shear plane. A first operator attached to an upper portion of the lading valve extends vertically up through the tank to the upper portion of the tank where it is adapted to receive a suitable handle or tool to move the lading valve between open and closed positions. A second operator is preferably attached to a lower portion of the lading valve. The second operator portion preferably extends at least partially through the valve housing. Thus the lading valve is operable from either the top of the tank or from the bottom of the tank. The first operator may be eliminated and the lading valve operated from the bottom.

Abstract: A frost-proof fire hydrant of the type wherein the valve is biased towards its open position by the fluid pressure in the shoe. The fire hydrant includes improved means disposed in the bonnet and cooperating with the valve stem for maintaining the valve in the closed position against the water pressure in the shoe.

Abstract: A servo valve controlled hydrant valve for aircraft fueling has a removable adaptor for the hose coupling and includes a clamping device which assures that the servo valve is deactuated before the adaptor housing can be unbolted for removal. Deactuation of the servo valve closes the vent line in a piston-cylinder main valve arrangement thereby assuring closure of the main valve.

Abstract: A well testing system and method in which a by-pass valve is positioned in the tubing and a probe run on a line from the surface opens and closes the valve with vertical movement of the probe. The probe when landed in the valve is exposed to formation fluids and may transmit back to the surface, or may record information about the formation. The probe may also collect a sample of fluid to return to the surface with the probe.

Abstract: A conventional pothead-tank combination for an oil-filled electric cable is modified to replace the usual manually operable venting valve within the tank and on the pothead by a relief valve installed to close under pressure of the oil and is further modified to add a manually operable gate valve on the tank wall with the valve passageway aligned with the relief valve.

Abstract: A tank vehicle lading valve assembly is provided including a lading valve mounted in an opening in the bottom of the tank which is movable vertically between open and closed positions. A valve housing or outlet chamber including an unloading spout is attached below a tank bottom mounting flange with fasteners, which preferably define a shear plane. A first operator attached to an upper portion of the lading valve extends vertically up through the tank to the upper portion of the tank where it is adapted to receive a suitable handle or tool to move the lading valve between open and closed positions. A second operator is preferably attached to a lower portion of the lading valve. The second operator portion preferably extends at least partially through the valve housing. Thus the lading valve is operable from either the top of the tank or from the bottom of the tank. The first operator may be eliminated and the lading valve operated from the bottom.

Abstract: A pedestal extends upwardly from the body of a gate valve housing in a straddling relationship to the gate. An operator, detachably attachable to the pedestal, includes a hand wheel operating through a pinion gear to impart translatory movement to a vertically oriented rack. A clevis is disposed at the lower extremity of the rack for attachment through a pin to the upper end of the gate. A removable pin is employed to secure the gate, in either a raised or a lowered position, to the pedestal and to maintain the gate in position after removal of the operator.

Abstract: A clamp usable in the mounting of a lever-actuated valve unit on a fitting, and in the operation of a lever on such unit when the unit is so mounted, where mounting is accomplishable through the rotation of a nut in the fitting relative to the valve unit, and lever actuation is accomplishable through the use of an actuator placed in a selected position adjacent the lever. The clamp includes a portion adapted for clamping onto the nut in the fitting, and an extension portion designed for use in rotating the clamp, with the latter clamped onto the nut. The extension portion is adapted for supporting the actuator, with the unit so mounted, in its selected position adjacent the lever.

Abstract: A hydraulic valve normally mounted at a convenient level for manual operation on a machine can be operated by a person's foot as opposed to his hand. Towards this end, there are provided mounting means for mounting the valve in an upside down position at the same level together with an elongated tube extending from the normally existing manually operable portion of the valve vertically downwardly terminating short of the floor. A transverse foot pedal is pivoted to the machine frame at the level of the lower end of the tube, this lower end in turn being pivoted to the same foot pedal at a point spaced from the first pivoting point. The arrangement is such that rocking movement of the foot pedal will actuate the valve in the same manner as manual actuation when the valve was upright.

Abstract: A portable add-on actuator module for use with a wireline cutting surface safety valve to provide supplemental energy for closing and simultaneously cutting a wireline extending through the surface safety valve in the event of an emergency. The unit includes a spring loaded locking collet assembly arranged to engage a locking recess within the stem of a surface safety valve so that the spring force may be added to normal valve closing forces such as line pressure and valve stem springs to supplement such forces for insuring the cutting by the surface valve member of a wireline extending through the member. The actuator module has a body which rests on the safety valve body without the use of any connecting structure. The module also includes structure for hydraulically compressing the spring for connecting the module on a safety valve and for hydraulically shifting the latching collet assembly to a disengaging condition for releasing the module from a safety valve.

Abstract: An easily sterilizable, low profile loading and unloading valve for mounting at the bottom of a tank includes a flange which is mounted adjacent to an opening in the bottom of the tank. A chamber extends through the flange, and a valve plug is mounted to one of the surfaces of the flange and extends into the tank opening. The valve plug normally closes the chamber in the flange, but is moveable to a position in which the chamber is opened to the tank. A cap is mounted to the other surface of the flange and closes the chamber. This cap may, alternatively, either take the form of a closure plate which closes the chamber during transport of the tank, or an adapter assembly which is mounted to the flange and which includes a connector for a loading and unloading conduit and a threaded biasing member for biasing the valve plug from its closed to its opened position.

Abstract: An atraumatic valving mechanism and its method of operation for use within the blood passageway of a blood access device, the blood passageway connecting a blood vessel within the body to the body exterior. The valving device includes a plugging means for effecting a seal within the blood passageway and for substantially expelling the blood from the device upon closing, and a reciprocal stem which is connected to the plugging means and may be pushed or pulled in order to close or open the blood access device valve as desired. The valving mechanism includes a disposable connectable valve chamber which is adapted to be secured about that portion of the blood access device blood passageway located at the body exterior.

Abstract: A bottom operable lading valve assembly for tank cars includes a valve closure plug movable between open and closed positions relative to a circular plug seat located within a valve body opening. A housing is affixed to the valve body with fasteners comprising a shear plane. The housing includes a generally vertical housing opening into which a rotatable valve operator is mounted comprising a lower tool connection portion, a shaft portion and an upper operating portion. The upper operating portion includes upper operator threads which engage an operating stem depending from the closure plug. The upper operating portion and the valve stem terminate on or above the shear plane. The valve operator shaft portion separates below the shear plane in the event impact causes the housing to shear off along the shear plane to maintain the upper operating portion, valve stem and closure plug in seated position to prevent escape of lading.

Abstract: A tamperproof hydrant lock with a controlled shock absorber. Power transmitting means are mounted on an operating rod extending within a chamber in the hydrant housing. A spring is mounted between the power transmitting means and the hydrant housing. First and second hydraulic means operatively associated with the power transmitting means control gradual opening and closing of the hydrant valve over first and second delay intervals of time respectively.

Abstract: An adapter for use with a bottom operable tank car valve assembly includes an upper attachment portion for quickly attaching the adapter to a bottom operable tank car valve guard assembly. The adapter includes a body portion having one or more spouts extending radially outwardly from the body portion to receive loading and unloading conduits. An adapter operator is provided having a lower tool connection portion and a vertical extension extending upwardly within the adapter for attachment to a valve closure operator located within the valve guard assembly for opening and closing the tank car valve. The present invention also includes a method of transporting lading from place to place utilizing the adapter for loading and unloading the lading and the valve guard assembly while the car is in transit to protect the valve closure from impacts in transit.

Abstract: A power wrench opens and closes a gate valve on irrigation water pipe thereby controlling water flow from the pipe into desired areas for irrigation of crops. The power wrench includes a tubular flow member which defines a flow passage extending through a second gear and through a gripping member mounted on the second gear and engageable with the gate valve whereby water flowing from the open valve will flow through the gripping member and tubular flow member. The power wrench is power operated and includes a drive motor operative to rotate a first gear and thereby turn a second gear in engagement therewith.

Abstract: A tamperproof lock with shock absorber for a fire hydrant. A spring is mounted at one end on the fire hydrant housing. Power transmitting means are mounted on a threaded operating rod extending within the housing chamber. Hydraulic means operatively associated with the power transmitting means prevents sudden closing of the hydrant valve. The power transmitting means transmit power to the threaded rod against the spring and the hydraulic means. A swivel plate is freely mounted on the power transmitting means for rotational movement thereon. The swivel plate has a contoured hub portion adapted to fit within an aperture within the fire hydrant bonnet. The hub portion is exposed to the exterior of the bonnet. Power means for applying power substantially along the axis of the threaded rod to move the rod against the spring and the hydraulic means are removably mounted on the bonnet.

Abstract: A tamperproof lock for a fire hydrant. A spring is mounted at one end on the fire hydrant housing. Power transmitting means are mounted on a threaded operating rod extending within the housing chamber. The power transmitting means transmit power to the threaded rod against the spring. A swivel plate is freely mounted on the power transmitting means for rotational movement thereon. The swivel plate has a contoured hub portion adapted to fit within an aperture within the fire hydrant bonnet. The hub portion is exposed to the exterior of the bonnet. Power means for applying power substantially along the axis of the threaded rod to move the rod against the spring are removably mounted on the bonnet. Means for preventing axial and rotational movement of the power means is pivotably connected thereto by means of a double pivot joint.

Abstract: A gate-type sliding valve for the outlet of a casting ladle is provided with support arms on which can be pivotably mounted operating means in the form of a hydraulically actuated piston and cylinder and maintained in their operating position by a torque force created by an unbalanced disposition of the weight of the cylinder and piston relative to their pivot mount.

Abstract: A sliding plate air flow control valve adapted for use in a high efficiency air filter system of the type used in clean rooms and the like. The sliding plate valve is preferably positioned on the downstream side of each filter, and includes a highly viscous, non-evaporating fluid positioned between the plates to thereby prevent the air from flowing laterally between the plates, whereby the volume of air flow may be accurately controlled over the full area of the clean room as well as the full area of each filter.

Abstract: A well testing system and method in which a by-pass valve is positioned in the tubing and a probe run on a line from the surface opens and closes the valve with vertical movement of the probe. The probe when landed in the valve is exposed to formation fluids and may transmit back to the surface, or may record information about the formation. The probe may also collect a sample of fluid to return to the surface with the probe.