Abstract: A low-temperature showcase in which a double air curtain can be formed for commodity inlet-outlet opening provided in one side of its main body comprising: a heat exchanger in an inner passage being positioned upstream of and at a predetermined distance from another heat exchanger in an outer passage with respect to the same direction of air flows, a partition wall defining the inner and outer passages and having a first window at a portion thereof between the two heat exchangers, a closure plate for opening or closing the first window to close or open the inner passage downstream of the first window, and first control unit for giving instructions to the closure plate for its operation, the first control unit being operative to instruct the closure plate to open the first window and close the inner passage downstream of the first window when the heat exchanger in the inner passage is operated for defrosting with the heat exchanger in the outer passage operated for refrigeration, whereby the air flow through t

Abstract: An improved control linkage assembly is disclosed which is particularly suited for embodiment in association with a material handling implement having a reversibly operable mechanism. The assembly includes an operating lever movable from a neutral position in one of two operating directions eminating from a common neutral position and extending in generally the same direction away from the neutral position. The operating lever is selectively engageable with one of two engaging levers for selectively moving a control element of a control member, such as a hydraulic valve, in one of two opposite directions. This type of movement is effected by a series of mechanical linkages which rotate an intermediate shaft clockwise and counterclockwise facilitating movement of the control element in first and second directions.

Abstract: A damper controls fluid flow and includes a frame with an opening through which the fluid is intended to flow when the damper is open, and a closure cap movable between a first position in which it blocks the opening and a second position in which the opening is unblocked. In the second position, the closure cap is rotated with respect to its first position, so as to minimize interference with fluid flow through the opening. A mechanism controls the movement of the closure cap, and includes a first and second bracket fixed with respect to the frame and the closure cap, respectively. An elongate guideway is defined in one bracket and a pin on the other bracket is captive within the elongate guideway.

Abstract: In an embodiment of the invention, the valve comprises an apertured valve seat toward and from which a valving element is movably disposed, for occluding and exposing the aperture in the valve seat to fluid flow. An actuating rod is coupled to the valving element and is movable along an axis for effecting movement of the element relative to the seat, and supporting structure is provided to support the actuating rod for its axial movement. However, the supporting structure, too, is movable along the aforesaid axis. Consequently, axial movement of the supporting structure reduces the possibility that, when the actuating rod must be moved, to effect movement of the valving element, it will be found to be stuck (i.e., "frozen") due to contamination, accretion of particulate matter, etc.

Abstract: A restoring device for an adjusting element, which serves in particular for restoring a throttle device of an internal combustion engine. The restoring device has a first spring subject to bending, which is disposed on a bushing that is rotatably supported about a throttle valve shaft and with one end engages a step of the bushing, while the other end of the spring is hooked onto the housing on the throttle valve fitting. A lever is connected with the shaft. The first spring subject to bending acts in the restoring direction of the throttle valve. A second spring subject to bending is disposed in the bushing, one end of this spring engaging the bushing and the other end being supported on the lever. The spring force of the second spring subject to bending is less than that of the first such spring, so that the bushing, with a stop step, is rotated so far that the second spring has not influence in the restoring direction upon the throttle valve.

Abstract: An apparatus for actuating a proportioning valve is presented. The valve consists of a pair of registers, each register having a cut-out portion defining a variable area orifice which is generally symmetrical about a central longitudinal axis through the orifice. The registers are respectively connected to a first and second drive shaft, the drive shafts being mounted about a common axis and being mounted in bearings in a frame such that by pivoting about the common axis, the drive shafts will urge the registers to simultaneously move in opposite directions. Each of the two drive shafts are provided with an arm which are pivotably connected to a tilting lever via a connecting rod. The two tilting levers are mounted on a pivot shaft which is parallel to the common axis of the two drive shafts. The tilting levers are also connected to a driving device, i.e., a hydraulic jack which acts to pivot them about their pivot shaft so that the registers are simultaneously actuated in opposite directions.

Abstract: A valve assembly including three separate gate valves aligned serially with one another and a mechanical linkage for operating the three separate gates in coordination with one another to permit small pieces of lumpy or granular and particulate solid materials to flow under influence of gravity through the three valves from a low pressure zone into a high pressure zone, without reverse flow of material from the high pressure zone to the low pressure zone. Each gate is biased to a closed condition and provides a substantially airtight seal when it is closed to prevent reverse flow from the high pressure zone to the low pressure zone. A mechanical linkage opens the first and last gates simultaneously and alternatingly opens the middle gate when the first and last gates are closed.

Abstract: The valve comprises a rotary valve member, which serves to close the inlet port. A pivoted valve arm, which extends from the rotary valve member, and a pivoted link, which engages said valve arm, ensure that a valve disc moves in unison with the rotary valve member to a position in which the valve disc effects a pressure-tight closing of the outlet port. The valve is preferably mounted on a reactor for gasifying solid fuels under a pressure of 2 to 150 bars, particularly on the ash discharge side.

Abstract: Butterfly valve actuated by a servo-motor, opening taking place by means of hydraulic force and closing by means of spring force. The hydraulic force must overcome the torque due to the flow, and the force of the closing spring. The excess hydraulic force of the servo-motor (2) during the end phase of the opening procedure is stored (3) and released during the closing procedure, whereby the closing time (t) can be minimized.

Abstract: A pair of spaced rotatable shafts are mounted within a housing. A linear motor mounted to the housing has a reciprocating piston within a double action piston chamber whose piston rod projects from the piston. Both shafts are fixed directly to axially aligned rotary valve stems, to opposite sides of the reciprocating piston rod. A pin coupled to the end of the piston rod projects through longitudinal slots within radial arms fixed to respective shafts at different levels and rotating with the shafts. Equal sized gears mounted to the shafts are in peripheral mesh such that the shafts rotate in unison. The mechanism eliminates side thrust on the piston and piston rod, doubles the valve breakout forces applied to the rotary valve member and eliminates the need for an outboard bushing for a piston rod extension beyond its connection to the paired shafts.

Abstract: A fail-safe actuator of the type which permits cycling of a control member during normal operation without encumbrance from a return mechanism includes a link having a slot. A pin secured to a crankshaft coupled to the controlled member is slidably disposed within the slot. The slot permits rotation of the crankshaft within a range defined by the slot length. Upon system failure, a fluid pressure is moved to a predetermined position by a biasing spring to force the crankshaft to a fail-safe position.

Abstract: A diverter valve and actuator assembly for diverting flow of a fluid from one path to another under the control of a power driven actuator, including a valve body having a chamber therein with an inlet port and two outlet ports, each outlet port having a valve seat therearound, a valve shaft extending through the body into the chamber, and a valve member carried by the valve shaft and disposed to be mated selectively with either of said valve seats by appropriate rotation of the valve shaft, and the assembly further including an actuator having a power driven shaft carrying a pivot which provides a reciprocatory component of motion with respect to the valve shaft when the actuator is driven.

Abstract: A "dump" valve for a concrete pumping line includes a tubular valve body for in-line connection in a distribution line and an end hinged cover plate for opening the valve. The valve includes a short rectangular discharge pipe, including flat walls, secured in a rectangular side wall opening in the valve body. The pipe has an outer flat end. A valve cover plate somewhat larger than the rectangular discharge pipe is provided with a sealing, gasketed face. The cover plate is hinged at one axial end to the valve body and is pivotally mounted to move between a closed position engaging the flat end of the discharge pipe and a pivoted depending open position in which the plate is swung clear of the bottom end of the discharge pipe section. An operating handle having an over-the-center latch linkage is coupled to the cover.

Abstract: A governor control linkage assembly to be connected between the governor and a valve to be controlled by the governor such as the inlet valve for a steam turbine upstream from a venturi type safety trip valve therein in one preferred form with Woodward T.G.-10 governors has a main lever arm connected at one end to the governor for actuation thereof and to the opposite end to a pivot arm on a fulcrum assembly which permits the pivot arm to be moved by a manually operable threaded assembly connected thereto so as to move the inlet valve from open to closed position and from closed to open position when the turbine is shut down to aid in the restarting thereof. In another preferred form with Woodward P.G.

Abstract: An adjusting mechanism (92) is provided between a valve spool (62) and a valve actuating lever (26) whereby with the lever (26) locked in a selected position, the mechanism (92) is manipulated to move an element (99) carried by the valve spool (62) into alignment with an indicator (110) that has been predetermined to be the selected setting of the valve. With the element (99) aligned with the indicator (110), the mechanism (92) is locked so that the valve spool (62) is in the selected setting when the lever (26) is in the selected position. A lock-down apparatus (70) is provided for use in locking the lever (26) in the selected position while the adjusting mechanism (92) is being manipulated.

Abstract: The invention relates to a device for shutting off large pipes in which a two-armed first lever (14) is connected through one arm (14a) to the actuating rod (9) while its other arm (14b) acts on a spring (15), while the two-armed second lever (16) is connected by one arm (16a) to the spring (15) while its other arm (16b) forms the pivot bearing (17) for the first lever (14). This arrangement enables the space occupied by the lever arrangement to be significantly reduced and provides for a simple construction.

Abstract: An angle valve is provided which is mountable on the exterior of a container having a container valve disposed therein and which includes a valve housing composed of a container-side connecting member having a front face and a channel formed therein opening onto the front face for communication with the container and a loading-side connecting member disposed at an angle to the container-side connecting member, which has a channel formed therethrough and which is capable of communication with a loading line. The valve housing further includes an intermediate connecting member having a receiving chamber formed therein which establishes communication between the channels of the loading-side and the container-side connecting members, with the loading-side connecting member disposed to discharge into the receiving chamber tangentially relative to the container-side connecting member.

Abstract: A vibration damping mechanism for a hydraulic booster including a manually operated pedal which includes a hydraulic booster body, a control valve mechanism disposed within the body, an input member slidably disposed within the body and operably connected to the control valve mechanism disposed within the body and first and second push rods positioned in tandem for operably connecting the input member to the manually operated pedal, the first and second push rods being bendably connected to each other at each end thereof with each end of the push rods being in eccentric arrangement relative to the input member such that radial movement of each end of the push rod is limited by the input member.

Abstract: A flow control valve is disclosed comprising a valve housing defining a through flow passage, a valve member supported in the housing for pivotal movement with respect to the housing between an open position in which flow through the passage is enabled and a closed position wherein flow through the passage is blocked, and an actuator for moving the valve member between said position. A linkage transmits actuating force from the actuator to the valve member and, a force limiting device limits the actuating force transmitted to the valve member when the valve member is in its closed position.

Abstract: An angle valve is provided which is mountable on the exterior of a container having a container valve disposed therein and which includes a valve housing composed of a container-side connecting member having a front face and a channel formed therein opening onto the front face for communication with the container and a loading-side connecting member disposed at an angle to the container-side connecting member, which has a channel formed therethrough and which is capable of communication with a loading line. The valve housing further includes an intermediate connecting member having a receiving chamber formed therein which establishes communication between the channels of the loading-side and the container-side connecting members, with the loading-side connecting member disposed to discharge into the receiving chamber tangentially relative to the container-side connecting member.

Abstract: A power-driven quarter-turn valve actuator includes a reciprocating drive member in the form of a rod mounted perpendicularly to and spaced a preselected distance from a valve stem. A crank arm is coupled to the valve stem so that the axis of the crank arm makes an angle of between approximately 60.degree. and 100.degree. with a line intersecting the stem axis and perpendicular to the rod axis when the valve is shut and makes an angle of between minus 30.degree. and plus 10.degree. with said line when the valve is fully open. A link member connects the outer end of the crank arm to a point on the reciprocating rod. The preselected distance between actuator rod and valve stem, and the lengths of the crank arm and link, are chosen to produce a variable actuator torque output curve that closely matches the operating torque requirements of the valve.

Abstract: A tank valve apparatus particularly adapted for effecting rapid discharge of the liquid contents of a tanker truck or the like, the apparatus being characterized by an improved valve opening apparatus actuated by an air cylinder. The cylinder includes a single acting piston requiring a certain cylinder pressure to move the valve to its open position, but requiring a significantly lower pressure to permit its return stroke, whereby rapid closure of the tank valve is facilitated.

Abstract: A linkage assembly for linearly moving a valve of a coupler between its open and closed positions has a yoke pivotally connected to a first link which is fixed to a rotary shaft so that the yoke rotates about the axis of the rotary shaft during a predetermined angular rotation of the rotary shaft. The yoke and a second link, which is pivotally connected to the valve, are in bearing engagement during the predetermined angular rotation. During a portion of the predetermined angular rotation, the center of the bearing surface of the second link is maintained in alignment with the axis of rotation of the shaft by a pin on the second link riding in an arcuate channel fixed to the shaft for rotation therewith.

Abstract: Linkage which extends between right and left brake pedals and a valve construction provided with an outwardly extending shiftable shaft and a pair of valves disposed to either side of the shaft. A bolt assembly passes through one end of the shaft and mounts a yoke for rocking movement, the yoke having ends equally offset from the valves. Right and left substantially identical linkages are employed, each linkage including a push rod mounted for limited adjustable sliding movement in a trunnion carried by a bifurcated arm of a bell crank. The other bell crank arm is connected to an end of the yoke by a ball joint assembly, one end of a tubular intermediate portion being adapted to bear against a valve.

Abstract: A fluid control valve having a pair of blades arranged one above the other in superimposed relation for relative movement in parallel planes, each of said blades including means having a generally concave edge, and said concave edges when arranged in opposed overlapped relation cooperating with one another to define an opening whose size varies with the degree of overlap. Simultaneous movement of both blades is such that the edges of the openings therein move either toward or away from one another to vary the size of the opening without appreciably displacing the center thereof. A suitable reciprocating actuator serves as the means for simultaneously actuating both blades, one of said blades being directly connected thereto while the other is operatively associated with the blade so-connected by a rigid link.

Abstract: A float actuated valve mechanism for automatically removing a predetermined amount of accumulated liquid condensate from a sump area of a gas pressurized drain trap or the like so as to regulate the level of liquid in such a sump area. A four-bar linkage between a float and a valve plug provides a non-linearly varying mechanical advantage throughout the movement of the float. In a closed position the valve plug mates with a rigid seating surface and an elastomeric seating surface to provide a wear-resistant seal.

Abstract: An automatic and manual linear reversion control mechanism for a hydraulic servo actuator assembly is disclosed for linearly transferring control between an automatic (fly by wire) control mechanism and a manual control mechanism. A command select mechanism includes two axially aligned pins mounted on a rigid command selector bar, with the first pins slidably mounted in a slot in a control bar of the manual control mechanism and the second pin slidably mounted in a slot in the control bar of the automatic control mechanism so that movement of the command selector bar to displace the two axially aligned pins in their associated slots provides a linear transfer of control of the hydraulic assembly between the manual control and the automatic control.

Abstract: A valve actuator is provided for use in conjunction with a valve having a rotatable member the rotation of which actuates the valve in dependence on the direction of rotation. The valve actuator comprises a housing and a coupling member rotatably carried by the housing and coaxially attached to the valve rotatable member. An elongated threaded shaft is rotatably mounted within the housing so that the axis of the shaft is perpendicular to and spaced from the axis of the coupling member. A nut member threadably engages the threaded shaft and a link is pivotally secured at one end to the nut member and at its other end to a radially extending portion of the coupling member. The link prevents rotation of the nut member on the threaded shaft so that rotation of the shaft axially drives the nut member along the shaft. An axial displacement of the nut member along the shaft in turn rotates the valve rotatable member via the link and the coupling member.

Abstract: This invention relates to a pivoted double handle self-locking mechanism for operating a valve. Each of a pair of oppositely extending handles is pivotally mounted on a socket member secured to a key that rotates the valve, each handle being provided with a gear segment that meshes with a corresponding gear segment on the other handle whereby rocking of either handle about its pivot by a lever connected thereto effects rocking of the other handle so that a lug on one handle is moved to a position in which it will not engage a stop carried by the valve body upon subsequent arcuate movement of both handles while in their rocked position in response to a manual pull exerted on the lever connected to either one of the handles.

Abstract: An actuator for reciprocating stem control valves having a linkage system affording variable force, reversible action, and adaptability to different valve strokes.

Abstract: This invention concerns a control system for automatic safety gate-valves.The system comprises two hydraulically controlled pistons, the rod axis of which is parallel to the axis of the valve passage, and a connection by equal connecting rods, symmetrical to the axis of the gate-rod, between each of the piston rods and the gate-rod, with a release spring exerting a force contrary to the opening force acting on each piston.This system is specially designed for automatic gate-valves for oil installations.

Abstract: A steering arrangement for construction vehicles and the like comprises a steering column assembly pivotally mounted on a stationary support for selective adjustment about a pivot axis disposed transversely relative to such assembly. A steering handle, rotatably mounted on the assembly, is operatively connected to a steering valve by linkage means for selectively steering a vehicle in response to rotation of the steering handle. The linkage means includes a push-pull cable having its upper end pivotally mounted about a pivot axis coincident with the pivot axis about which the steering column assembly is pivotally mounted on the stationary support to prevent actuation of the steering valve upon adjustment of the steering column assembly.

Abstract: An internal tank valve having a seating plate defining a valve seat, a valve member, a straight line linkage supporting and guiding movement of the valve member to and from engagement with the valve seat, the valve member having a rounded surface facing the direction of flow through the valve seat, a pressure equalizing valve in the valve member, means for moving the valve member into and from engagement with the valve seat and means for absorbing shock loading on the valve member.

Abstract: In a carburetor having a fuel metering rod longitudinally movable through a fuel supply orifice with a lower end laterally movable to a limited degree, a positioning link connected to the lower end positions the metering rod according to fuel demand. An adjusting lever is pivotable with respect to the housing and includes an adjusting screw to set its position. An adjusting link connecting the adjusting lever to the lower end of the metering rod causes the position of the metering rod to be changed independently of fuel demand according to the position of the adjusting screw and lever.

Abstract: Proper ventilation is achieved by exhaust fans which draw fresh air into the building through an inlet duct. The inlet opening is adjustable by a valve movable between generally open and closed positions and a movable deflector controls the direction of flow in accordance with the rate of flow to achieve even circulation. The valve and deflector position are controlled by an actuator responsive to the pressure differential between the inside and outside of the building. Preferably, the inlet opening is a longitudinal slot extending the length of the building along each side at the ceiling and the exhaust fans are positioned at the floor. Preferably, a louver in front of the opening controls the effective size of the opening and the deflection angle of flow into the building.