Abstract: The valve assembly employs a peak flow valve with a first adjustable orifice which restricts gas flow through a conduit to establish a peak flow, a peak flow control for adjusting the size of the orifice, a separate valve which progressively closes a second conduit orifice in response to increases in the conduit pressure so as to achieve a desired decay rate for periodic gas flow, and a decay rate control which adjusts the initial closure of the second orifice. The valves are interconnected by means of a coupling which, in response to the decay rate control being adjusted, automatically adjusts the size of the first orifice by an amount sufficient to substantially compensate for changes in the peak flow rate caused by the decay rate adjustment.

Abstract: A diaphragm valve which may serve as an equal pressure valve or as a pressure equalizing valve of a fuel metering and distributing unit for an externally ignited internal combustion engine. The valve has a flexible diaphragm having a clamped diameter and a pocket in the diaphragm supports a valve plate. The valve plate operatively cooperates with a valve seat of the valve and has an annular recess arranged to receive a spring to center the valve plate. The valve also includes a stationary thrust plate which is concentrically disposed relative to the valve seat, which defines a knife-shaped edge which lies in a common plane with the valve seat and which operatively cooperates with the valve plate. The knife-shaped edge is penetrated by a plurality of radially extending means defining openings therein.

Abstract: A flow control device for controlling liquid flow, especially a liquid being fed intravenously to a hospital patient. A membrane is deflected in the housing so as to cut off liquid flow when the supply input decreases, thus avoiding the possibility of air being introduced into the system.

Abstract: In a flow metering valve of the type in which flow through the outlet ports is regulated as a function of spool displacement and the measured pressure difference across the outlet port, valve accuracy is greatly improved by providing a ducted chamber through the valve casing to communicate with the valve interior such that upstream pressure at the outlet is measured internal to the valve. This arrangement prevents the hydraulic losses associated with the internals of the valve from generating erroneous pressure measurements.

Abstract: A sidestream of injection liquid taken downstream of a filter is passed through a monitoring filter of appropriate pore size. Pressure drop over the monitoring filter is determined and a regeneration cycle for the main filter is triggered in response to differential pressure (.DELTA.P) over a preset value, which corresponds to deterioration in filtrate quality.

Abstract: A flow-control valve assembly for connection between a source of fluid under pressure and a fluid-operated load has a main valve and a pilot valve. The main valve defines a continuous flow path having an input end connectable to the source of fluid under pressure and an output end. This valve further has a valve member which defines with the housing of the main valve a plurality of variable flow restrictions, the valve member being displaceable in the main-valve housing between an open position wherein the restrictions are all of maximum flow cross section and a closed position wherein the restrictions are all of minimum flow cross section. A pilot valve has an input side connected to the output end of the continuous flow path through the main valve and an output side connectable to the load.

Abstract: There is disclosed a flow controller-flow sensor combination especiably suited for gas chromatograph applications wherein a transducer monitors the pressure at the inlet and outlet of a flow restrictor element in the controller thereby to monitor the differential pressure across the restrictor; the differential pressure being proportional to the gas velocity through the flow restrictor element. In one form of the invention, a second flow restrictor element is provided in one input line to the transducer which preferably is of relatively low impedance in order to delay the buildup of the pressure head of the corresponding input of the transducer sensor, thus to enable the pressure at the outlet of the flow restrictor in the controller to buildup gradually so as not to exceed the maximum differential pressure specifications for said transducer.

Abstract: An automatic pressure regulator of the rolling diaphragm type requiring but one single rolling diaphragm. The diaphragm is of the deep convolution type. The rolling wall of the diaphragm controls the effective cross-sectional area of an orifice means which, in turn, effects the regulation of pressure. The force created by the high pressure acts against a spring tending to move the rolling wall of the rolling diaphragm to the orifice closing position thereof. The effective area of the rolling wall of the rolling diaphragm is variable to compensate for variations of the force of the spring resulting from changes of its length.

Abstract: Apparatus for regulating pressure of treatment fluid being supplied to a human or animal eye during ophthalmic procedures such as cataract surgery is disclosed.Flow sensing and pressure regulating diaphragms are provided in a body to modulate a flow control valve. The pressure regulating diaphragm is connected to the flow control valve to urge the valve to an open position due to pressure being applied to the diaphragm by bias means such as a spring. The flow sensing diaphragm is mechanically connected to the flow control valve and urges it to an opened position because of the differential pressure on the diaphragm generated by a flow of incoming treatment fluid through an orifice in the diaphragm. A bypass connection with a variable restriction is connected in parallel relationship to the orifice to provide for adjusting the sensitivity of the flow sensing diaphragm.

Abstract: A readily disassembleable fluid flow rate controller arranged for facilitated sanitizing whereby the controller is adapted for use in controlling the flow rate of fluid food products and the like. The controller includes an adjustable orifice device and a spring-biased regulating device. The orifice and regulating devices are removably installed in a separable housing. Removable securing structure is provided to permit facilitated disassembly and assembly of the controller for facilitated sanitizing of the elements thereof.

Abstract: A constant flow valve for low flow rates employs a tire valve assembly which is threadably received within the downstream end portion of an axial passageway formed in an elongated inlet tube. The tube is received within a stem portion of a first part of an internal housing. A movable wall which is at its periphery clamped between a base portion of such first part and a bell portion of the second part, divides the interior of said housing into upstream and downstream chambers. The stem portion of the tire valve assembly extends into the upstream chamber and contacts the movable wall. A biasing spring is located in the downstream chamber and exerts a biasing force against the movable wall which is in turn transmitted to the control stem. A considerable length of relatively small internal diameter, high flow resistance tubing is coiled about the inlet tube and the stem portion of the first housing part.

Abstract: A counterbalance valve assembly for controlling the lowering of an actuator driven load including a housing with a passage connected to deliver fluid to or from one side of the actuator. A main pilot-operated lock check valve is provided in this passage to selectively block flow from the actuator when it is desired that the load be held and also to move to an open position permitting return flow from the actuator with the open valve defining an orifice. The speed of the load is controlled by maintaining a constant pressure drop across this orifice with a compensator valve upstream of the main check valve, which serves the purpose of throttling flow from the actuator to the check valve.

Abstract: A self-depressurizing hydraulic control valve having a sliding-type metering valve to control the flow of hydraulic fluid through the valve and also a shutoff valve to stop the flow automatically. The shutoff valve is responsive to the rate of flow of fluid through the control valve and stops the flow when the flow rate decreases to a preselected value. When the shutoff valve closes, the control edges of the metering valve are no longer exposed directly to high pressure fluid, and quiescent leakage across the edges is practically eliminated. Thus, electrochemical erosion of the metering edges resulting from such leakage is substantially reduced.

Abstract: Quieting means for a fluid flow control device is shown in connection with a typical spool type throttling valve. The quieting means consists of a stack of washer-like members or disks which cooperate to define a large number of finely divided flow paths across the stack of disks. To provide a configuration which is very economical of space, the disks are arranged such that the flow path turns back and forth through different planes. Groups of flow paths are defined by a number of groups of three perforated disks confined between two imperforate disks. Two perforated disks having patterns of slots are positioned on opposite sides of a similar disk having a pattern of small orifices.

Abstract: Quieting means for a fluid flow control device is shown in connection with a typical spool type throttling valve. The quieting means consists of a stack of washer-like members or disks which cooperate to define a large number of finely-divided flow paths across the stack of disks. To provide a configuration which is very economical of space, the disks are arranged such that the flow path turns back and forth through different planes. Groups of flow paths are defined by a number of groups of three perforated disks confined between two imperforate disks. Two perforated disks having patterns of slots are positoned on opposite sides of a similar disk having a pattern of small orifices.

Abstract: A carbonated beverage dispenser includes a valve body defining a carbonated liquid inlet, a syrup inlet, a bore and an elongated syrup stem disposed within the bore. A nozzle is provided having an outlet and the syrup stem terminates in a syrup outlet adjacent the nozzle outlet. Also provided is a diffuser assembly including a stem member, a collar member and a diffuser member. The stem member surrounds the syrup stem and includes a stem portion and an enlarged head portion, the outer surface of the head surface and the valve body bore defining a liquid chamber communicating with the carbonated liquid inlet. A first portion of the collar member adjacent the head of the stem member cooperates with the stem member to define a plurality of liquid passages communicating with the liquid chamber, and a second portion of the collar member defines an inner surface spaced apart from the stem portion.

Abstract: The invention is an automatic flow control valve. The rolling cluster of a olamite is biased by the constant force due to the vertical component of gravity on the mass of the rolling cluster. The band of the rolling cluster progressively covers or exposes a porous passage which is integral with one of the rolling planes of the rollamite. Fluid flows through the porous passage and past the rollamite band.The rolamite valve of this invention may be selectively modified to become, alternately, a remotely operated fluidic control valve, an automatic self-regulating volumetric flow control valve, an automatic self-regulating flow control valve for maintaining a constant output pressure, a vapor trap valve, and an automatic self-regulating flow control valve for maintaining a constant input pressure.

Abstract: A metering valve assembly for accurately controlling the flow of fluid independent of the pressure fluctuations at the input or at the output of the metering valve assembly. An electrical coil mounted on the assembly housing controls the position of an armature of an electromagnet in a permanent magnet field which, in conjunction with a nozzle assembly transmits pressure through suitable conduits to control a first slider valve. The displacement of the first slider valve controls the opening of a port area so that the flow through the port area is a function of the differential pressure developed across the port area with the output of the port directed through suitable conduit means to a second slider in the valve which is opposed to the upstream pressure of the metering valve.

Abstract: A secondary air control device which comprises an air passage communicating an air pump with a recombustion device and having a resistor such as an orifice provided midway of the passage and a control valve for maintaining substantially constant the pressure ratio of the pressure on the upstream side of the aforesaid resistor to that on the downstream side thereof, said control valve being so designed as to be operated in association with the pressure of the secondary air and that of exhaust gas, thereby eliminating fluctuation in pressure in the secondary air due to reduction in the discharging performance of the air pump, and thus the secondary air proportional in quantity to the exhaust gas from an engine may be supplied.