Abstract: A flushing valve for installation in a drip irrigation system comprises a head portion at one end of a tubular body that fits within the end of one of a series of lateral conduits of the system and has a recess open to the conduit. A transverse passage extends diametrically through the head portion to accommodate a flexible conduit which serves as a pilot line. When filled with fluid under pressure, the pilot conduit covers and seals a port between the recess of the tubular body and the transverse passage. An open slot is provided in the outer side of the head to facilitate installation of the pilot conduit.

Abstract: A control and selector unit for a dental handpiece is provided of the high pressure air driven type. The control and selector unit includes a bracket for supporting a handpiece, and a resilient metal strip having a free end extending into the bracket. The other end of the resilient strip is supported on the base of the control unit, and the strip acts as a pinch valve for a tube carrying high pressure drive air to the handpiece. The pinch valve releases the tube when the handpiece is removed from the bracket so as to cause the handpiece to be activated. The control unit may also include additional resilient strip pinch valve controls for controlling the supply of coolant air, or other gases, and water to the handpiece when the handpiece is removed from the bracket.

Abstract: A pinch valve includes a distortable rubber-like valve member, in cylindrical form, positioned within a generally cylindrical housing. The valve member has uniformly spaced projections and grooves which enable the valve member to collapse upon itself forming a complete closure between opposite ends thereof. When the valve member so collapses, the circle defined by the outer areas thereof has a greater radius than the radius of the valve member in the uncollapsed condition. The housing has lobular areas to accommodate the extensions of the collapsed valve member.

Abstract: A fluid operated pinch valve comprises a flexible sleeve fixed at its ends within a valve casing that has a laterally facing opening through which the sleeve may be inserted and replaced without removing the valve casing from the flow line. A casing cover section has a planar sealing face that bridges the opening for sealing engagement with the main casing section, and which also seals against linear sealing flanges on ends of the flexible sleeve.

Abstract: There is disclosed an annular blowout preventer having a packer which is surrounded by an annulus of resilient material, and an operating system which includes means for longitudinally compressing the outer annulus in order to constrict its inner circumference and thereby move the packer from an expanded position, in which it opens the bore through a housing in which the packer and outer annulus are received, to a constricted position in which it closes the bore by sealing about a pipe in the bore or upon itself.

Abstract: A variable-venturi nozzle for the measurement and regulation of flows in gas conduits, in particular in internal combustion engine intakes, wherein at least one wall element in the zone of the venturi throat thereof is in the form of at least one elastic wall deformable under the action of the pressure of a control fluid.

Abstract: A flowable material dispenser having a bore therethrough. A resilient pinch-off tube is removably fitted within the bore. A flowable material reservoir is connected to one end of the tube. At least one dispensing nozzle or needle is coupled to the other end of the tube. Within the dispenser is a mechanism for selectively squeezing the tube to force selected amounts of the flowable material out the needle, and then to draw any residual amount of the material in the needle back away from the distal end of the needle thereby to eliminate dripping. Connected to the squeezing mechanism is a control system for sequencing the squeezing operation to perform the method of the invention which includes the steps of filling the tube with material, isolating a portion of the material in the tube from the reservoir, dispensing a portion of the isolated material, drawing the remaining portion of the isolated material in the needle back away from the distal end of the needle, and refilling the tube with material.

Abstract: A fluid flow control valve has a housing with axially spaced upstream and downstream portions. An axially slidable piston is received within an upstream portion of the housing and a buckleable plate brace is anchored within a downstream portion. Two axially extending buckleable plates are each affixed at one end to the piston and at the other end to the brace. Two parallel walls extend from the brace toward the piston such that opposite edges of each buckleable plate are in a generally slidable engagement with the walls and form a variable area flow path therewith. The dynamic force of the fluid flowing through the valve acts against the piston, thereby tending to buckle the plates and reduce the area of the flow path. The valve, therefore, works to automatically regulate fluid flow to a predetermined value determined by the valve geometry and the mechanical properties of the plates as they buckle.

Abstract: A clamp particularly suited for pressure-filled fire hoses has a jaw configuration with three clamping edges with minimum spacing between jaw faces at the clamping edges arranged to effectively close off flow without slipping or twisting, structures for locating one or more hose sizes between the jaws to avoid bunching, and a cast support body and handle arrangement to facilitate operation in either of two positions.

Abstract: A valve assembly of the type, wherein a first end of a movable plunger is adapted to collapse or compress a first tube length against an opposite tube backing or support structure in order to regulate or vary the flow conditions of a fluid in this first tube length, is equipped with a control assembly comprising a second interiorly pressurized tube length and a second or opposite end of the plunger engages this second tube length. Thus, by appropriately proportioning the sizes of the contact faces between the respective plunger ends and the tube length associated therewith it will be possible to control the flow conditions in one of the tube lengths responsive to the fluid pressure in the other tube length whereby various valve or regulating functions may be performed by the valve. The two tube lengths may be parts of one and the same tube whereby additional valve or regulating functions may be performed.

Abstract: A press system includes an improved valve assembly which is utilized to control a flow of hydraulic fluid from a die cylinder chamber. This valve assembly includes a pair of rigid foraminous members and a resiliently deflectable valve member. The valve member is movable between a closed position extending across and sealing openings in the foraminous members and an open position in which the valve member is spaced apart from the openings to enable hydraulic fluid from the die cylinder chamber to flow through the openings in the foraminous members. The valve member is urged toward the closed position by a compressible fluid, such as nitrogen gas. When the hydraulic fluid pressure in the die cylinder chamber exceeds a predetermined pressure, the valve member is moved from the closed position to the open position against the influence of the biasing pressure applied against the valve member by the compressible fluid.

Abstract: A valve wherein an expansible tube is stretched around a hollow core, which has a central barrier between inlet and outlet slots around the core. An annular groove is formed around the outer sealing surface of the barrier and extensions of some of the downstream slots open into the groove to vent the groove and produce a pressure drop across the expansible tube to enhance sealing and to provide an initial flow path when the tube is forced away from the sealing surface.

Abstract: A humidifying apparatus has an evaporating chamber having an air inlet and an air outlet. The chamber has a bottom wall for supporting a film of water to be evaporated. A drain is associated with the bottom wall for continuously draining water from the evaporating chamber during an operational cycle. A fan is connected to the air inlet of the evaporating chamber to discharge a stream of air into the chamber and across the bottom wall. A water holding tank, having a top wall containing at least one water outlet aperture, is so located in the evaporating chamber to position the aperture adjacent the air inlet and in the flow path of the stream of air. Water supply means selectively supplies water to the holding tank when the fan is operative. The supply means provides a pressure signal, but only when supplying water to the holding tank. A valve means, associated with a water outlet from the holding tank, is in a closed position responsive to the pressure signal.

Abstract: A sleeve valve comprising a torpedo shaped core provided with radial, longitudinal ribs, a generally cylindrical sleeve surrounding the core and being made from radially elastically deformable material and a generally cylindrical housing, against which the sleeve is sealed at both ends and in which the core is supported by means of radial supports between each end of the sleeve and the corresponding end of the core at least two approximately radial fins being provided each located between two longitudinal ribs of the core, the contour of said fins facing the sleeve substantially corresponding to the shape the sleeve has at that point in its normally closed state.

Abstract: There is disclosed an annular blowout preventer wherein a packer, received within a recess about a bore through the preventer housing, is adapted to be contracted by means of a piston having an annulus of resilient material movable inwardly within a chamber surrounding the recess and divided therefrom by a wall of the housing, and a disc-shaped member of resilient material extending through and sealably slidable within a slot in the wall to transmit the inward movement of the piston to the packer.

Abstract: A physiological shunt system for draining fluid from one region of the human body and discharging it into another in which means is included to resist overdrainage or siphoning of the region as a consequence of low downstream pressures, and a valve to provide such means. The system includes a collector catheter and a discharge catheter, and the valve interconnects these catheters to open the system to flow, or to close it to flow, as a consequence of the position of its closure means which is responsive to the pressure differential between the pressure in the valve as transmitted by the catheters, and a reference pressure such as the atmosphere.

Abstract: A valve suitable for connection to a vacuum sewer system and comprising a flow duct with a resilient wall which acts as a flow duct closing member. Outside the wall with respect to the flow duct there is a closed chamber connectable to suitable pressure sources in order to move the resilient wall by means of pressure between a flow duct closing and a flow duct opening position. In order to improve the closing movement of the valve the resilient wall is provided with a stiffener at the outlet side of the flow duct.

Abstract: A valve body having a circular cylindrical shape may be made of plastic or any other suitable material. A radial hole through the wall of the body has a pressure inlet fitting positioned therein. A flexible tubing is passed through the body co-axial therewith. The tubing is folded back to overlie the ends of the valve body and a valve end tube is positioned to overlie the folded back ends of the flexible tubing. Clamps are utilized to impart inward radial pressure about the circumference of the valve end tube overlying the folded back tubing. The valve end tube is adapted to receive the ends of an inlet and an outlet flow conduit. Pressure of varying magnitude introduced through the pressure inlet fitting serves to meter the fluid flow through the conduit from a full flow to substantially zero flow as the flexible tube distends into the passage through the valve body.

Abstract: A diaphragm valve has a relatively long seating formed by a plurality of ribs which engage with one air operated diaphragm. An annular valve is provided by slotting the outer surface of an annular seating member which engages an endless diaphragm, alternate slots communicating with the inlet or outlet of the valve. A pneumatic actuator for a vehicle braking system is provided with internal valve means for controlling the flow of air through the movable wall carrying the actuating member. An anti-skid braking system employs such a pneumatic brake actuator, the internal valve means being operated by skid sensing means.

Abstract: A shutoff valve and control means particularly adapted for subsurface use in oil or gas wells, the shutoff valve being in the form of a sleeve having both circumferential and pre-stressed-longitudinal reinforcing, so arranged as to permit radial contraction of the sleeve under external closing pressure until passage therethrough is completely closed, while preventing rupture of the sleeve from pressure differential, between either its ends or its exterior and interior; the shutoff valve, being controlled by a set of four control valves and a pressure-fluid reservoir, both adjacent to the shutoff valve, is connected to the surface by a control line and a vent line; the set of control valves comprising an emergency-delivery valve, a overriding-delivery valve, a low-pressure vent-valve, and a high-pressure vent-valve.

Abstract: A breathing gas supply controller, comprises a housing which has a gas inlet leading to an internal gas passage which opens at the opposite end in a gas supply opening for supplying gas to a place of use, such as to aid in a person's respiration. The interior gas passage has a widened portion with an elastic valve tube in the passage which defines an annular pressure chamber around the tube which is separated from the passage. A valve member extends through the passage and it includes an intermediate annular widened portion which is engaged against the interior of the valve tube in a closed position to close off the gas passage. A control chamber, which is defined in the housing, has a first control passage communicating with the pressure chamber and a second control passage communicating with the gas passage on the downstream or gas supply end thereof.

Abstract: An expansible tube valve having inlet and outlet body and closures with a generally cylindrical body enclosure between them. A flexible tube embraces a slotted core and integral enlarged beads around the ends of the tube are confined in accommodating annular recesses. Being so confined, the beads serve as retainer means for the tube ends and function also as body seals, being under moderate compression between cylindrical surfaces on the end closures and the interior of the body enclosure.

Abstract: This invention relates to a positive displacement adjustable volume pumping and dispensing system used to supply measured amounts of viscous material. The system includes a pneumatically or hydraulically driven submersible adjustable volume piston-type pump, and a combination two-section pinch-off aspirator valve that is connected to the pump. The pinch-off section of the valve is used to dispense the metered amount of fluid to the aspirator section of the valve and the aspirator section of the valve prevents drip from the nozzle after the material is dispensed as well as aids in advancing the material to a dispensing nozzle.

Abstract: An apparatus for constricting or closing a conduit comprises a pair of generally parallel clamp frames opening in the same direction and disposed at a separation such as to accommodate the conduit between them, the clamp frames being formed in one side of their opening with a recess in which fits a stationary clamp member and being secured on their other side to a fluid operated ram that actuates a movable clamp member towards the stationary clamp member. After operation of the ram the two clamp members are fastened together, eg by bolts, and then the ram is retracted. The clamp members can then be removed from the clamp frames.

Abstract: In one embodiment, a valve body contains a flexible valve sleeve between a fluid inlet and a fluid outlet, and an annular chamber around the sleeve connects with the inlet so that fluid pressure in the chamber normally compresses the sleeve to a closed position. A manually operated pilot valve reduces pressure in the chamber so that the sleeve is expanded by fluid pressure from the inlet to open the valve.In another embodiment, a valve body contains a flexible diaphragm which normally closes an inlet valve port and defines a pressure chamber isolated from a fluid outlet. A manually operated pilot valve reduces pressure in the chamber so that the diaphragm is unseated from the inlet port by fluid pressure from the inlet to open the valve.

Abstract: In a pressure surge relief system wherein a valve opens to relieve the pipeline when line pressure overcomes a pilot chamber gas pressure and including an accumulator which transfers the pressure of the pipeline liquid to the gas in the pilot chamber, the improvement comprising a column of relatively inert fluid which isolates the elastomer components of the accumulator from the possibly corrosive pipeline fluid.

Abstract: A pneumatically controlled liquid transfer system for delivering a liquid from a source to a delivery location, said liquid source being provided with a pneumatic cylinder for driving the liquid from said source, a pneumatically operated pinch valve of the make-before-break type and flexible conduit paths leading through the valve to the delivery location. The make-before-break pinch valve comprises a valve shell having two pistons movable laterally therein. The shell has a window. One piston has a yoke, each arm thereof having a passageway, one aligned with the other. A stop extends between the arms of the yoke. One of the flexible conduits is arranged through the window between the first piston and the yoke and the other flexible conduit is arranged also through the window but within the aligned passageways and between the piston and post. The second piston is spring biased to bear against the second conduit to place same in a normally closed condition. The first conduit is normally open.