Abstract: A nozzle shut-off valve for injection molding machine for plastic material, especially thermoplastic material, has two pneumatic cylinder-and-plunger units. One such unit has its plunger mounted to reciprocate so as to block the passageway of the plastics through the nozzle. The first such plunger and cylinder unit is provided with a pilot passage in the valve nozzle so that the pressure of molten plastic can be used to open it. The second such unit is much smaller diameter and has its plunger mounted to block the pilot passage so that the second unit in effect becomes a pilot valve and controls the application of fluid pressure through the pilot passage to the first unit plunger or blocking plunger.

Abstract: A diaphragm-actuated slide valve where spring force is utilized to urge the moving slide valve element against the stationary valve element. To obtain a good seal at the valving ports with a minimum of spring force, the moving slide valve element is made to present a convex contact face to the stationary valve element at the port region of the moving valve element. At the same time, a clamping connection of the fluid tube to the moving slide valve element is obtained. The moving slide valve element is in the form of an apertured, initially flat block. The fluid tube passes through an aperture in an initially curved spring clamp plate provided with clamping serrations in the tube-receiving aperture, the tube engaging in a counterbore in the valve block at its port. Clamping screws engage through opposite parts of the clamp plate and threadedly engage the valve block at opposite spaced locations relative to the tube.

Abstract: A pilot operated valve comprised of a cylindrical grooved spool having axially aligned throttling slots which require alignment with certain ports in an encompassing housing is prevented from rotation in the housing during reciprocation therein by a noncircular tang extending outwardly of the housing and fitted in a specially configured pilot chamber formed in an attached cover.

Abstract: A feathering valve system for modulating the fluid inflow to a selected one of first and second spool ends of a spool valve assembly. A controller is electrically coupled to first and second solenoid operated pilot valve assemblies for selectively (1) maintaining the pilot valve assemblies in a valve closed state without bleed flow through the pilot orifices or (2) supplying a predetermined value electrical signal to either, but not both, of the valve assemblies for actuating one of the assemblies to an open position related to the value of the signal. Fluid under a substantially constant pilot pressure is applied under the poppets of both valve assemblies. Fluid flow is taken from above the poppet of an actuated valve assembly to a respective spool end whereby the spool moves to a position which is a function of the actuating signal value.

Abstract: An actuator 4 for a valve 2 disposed in a gas pipe line 1 is driven directly by the gas pressure in the pipe line, which is tapped off and supplied to the appropriate end of the actuator cylinder via an electromagnetic spool valve 12 or 25. A hydraulic transfer circuit couples the chambers on the piston rod sides of the actuator cylinder, and includes flow control valves 17, 18 for regulating the actuator speed and an oil expansion tank. The latter may be sealed and a positive pressure established therein to facilitate the oil transfer. A hand pump 22 may also be provided to implement the oil transfer and drive the actuator piston from the piston rod side if the gas pressure is too low to power the actuator.

Abstract: A nozzle shut-off valve for placing between the injection apparatus and the mold cavity uses two pins of different lengths for the valve elements and switches air pressure back and forth between pistons on opposite (outer) ends of the pins. The pistons have no fixed connection to the pins. Each pin is actuated either by force from the piston on its outer end or pressure by the plastic melt on its innermost other end. The longer pin has a length sufficient to extend completely across the injection passage and block it to prevent any flow. The shorter pin is deliberately made short enough that it cannot block the passage. The valve is actuated by air pressure on the two pistons in timed relation to injection molding events. Pressure on the piston engaging the longer pin compels blocking of the injection passage during plastication. Switching of pressure to the other pin during injection permits the pressure of molten plastic to spread the pins apart whereupon injection proceeds in the ususal manner.

Abstract: A device for the setting and automatic regulation of the mixture ratio of a gas/air mixture for industrial furnaces comprises two coaxially-arranged diaphragm pressure gauges, connected in opposition, via a ratio setting mechanism, for the gas and the air, and a throttle member, controlled by the diaphragm displacement, in the gas or the air feed pipe. The two diaphragm pressure meters each are oppositely acted upon on only one side by the gas pressure or the air pressure respectively. The throttle member is controlled directly by the diaphragms. The diaphragm pressure gauges and the ratio setting mechanism together with the throttle member are designed as a structural unit.

Abstract: A valve which preserves the vacuum between a gun and a welding enclosure in an electron-bombardment.The valve contains a chamber which communicates with the gun and the enclosure via opposing orifices, with a sliding piston provided with a passage coming into line with the orifices when the valve is in the open, or welding position, the piston being actuated by means employing fluid.The invention is applicable to electron-bombardment welding machines and in particular to machines fitted with visual means for inspecting the parts to be welded.

Abstract: A fluid control valve includes a valve body having a pump inlet port and a drain outlet port and is of a construction sufficient for connecting the pump inlet port to a relatively high pressure pump and the drain outlet port to a substantially atmospheric pressure reservoir. A valve spool has a metering slot leading from the peripheral surface of a first land to a peripheral surface of a second land, the metering slot including a substantially cylindrical pocket recessed into the second land, and a groove formed in the first land and a reduced diameter portion positioned between the lands. The groove connects the peripheral surface of the first land with the cylindrical pocket and has an arcuate surface portion leading from the peripheral surface of the first land and an elongated bottom surface positioned substantially parallel to the longitudinal axis of the spool and tangent to the arcuate surface portion.

Abstract: Valve-positioning apparatus especially adapted for use with fluid-operated spool valves for positioning the spool member of such a valve in a predetermined position whenever the valve is not operating such as upon installation or during shutdown. In the preferred embodiment, the positioning apparatus includes a piston member normally held out of contact with the spool by fluid pressure but urged into contact with the spool to position the spool when fluid pressure fails or is absent. The positioning apparatus may be used on either or both ends of the spool valve.

Abstract: A device for opening and closing a rotary valve by remote control comprising a cylinder having a main bore in which a movable unit is slidably mounted in fluid tight manner and which can be displaced in opposite directions by a pressurized fluid supplied by either of two pressurized fluid sources which can be remotely actuated in independent fashion. A sequencing mechanism is mounted in the cylinder for simultaneously applying the pressurized fluid from an activated source to a corresponding end face of the movable unit while connecting the other end face with the atmosphere. The movement of the slidable unit is transmitted to the rotary valve through a rack and pinion arrangement and a linkage composed of cranks and a connecting rod so arranged that when the valve is in either of its end positions it cannot produce movement of the linkage due to alignment of the axis of rotation of the pinion and the connection points of the rod to the cranks.

Abstract: An apparatus assembly for distributing and adjusting flow of cooling fluid to control the temperature of a glass forming mold used for forming generally funnel-shaped articles such as, for example, funnel members for glass television picture tube envelopes, the assembly including a cooling fluid distributor in the form of an orifice member or perforate baffle and a plurality of adjustable valves for selectively adjusting and directing the flow of the cooling fluid to and about different parts of the outer surface of the forming mold for selective temperature control of the mold during the forming of glass articles therein.

Abstract: A proportional electromagnetic-type direction-and throttle-controlling valve comprising a spring centered valve spool in a valve body, a pressure reducing valve, two flow restricting orifices, two DC solenoid controlled poppet valves and a vent port in each pressure chamber. Supply flow reduced to a fixed low pressure is divided into two branch lines with flow restricting orifices. The pilot pressure in each restricted flow passage with vent port is controlled by a DC solenoid-controlled poppet valve. The pilot pressure acting on the main spool end moves the spool against the spool centering spring force proportionally to the input DC current. Therefore, the flow rate through the throttling gap between the spool land and the mating valve body is controlled proportionally to input DC current. Vent ports are provided for rapid action of the spool.

Abstract: A gate valve having good seismic profile has a gate which is rapidly and efficiently shifted between fully opened and fully closed positions by pistons housed within cylinders formed integral with the valve body. The gate comprises two half-gates or discs having means interposed therebetween for disposing said half-gates in positive, sealing relationship with the seating surfaces of the valving port of the valve body when the gate is in a fully closed position. Movement of the gate is effected by the pressure media being controlled by the valve in such a manner as to eliminate leakage.

Abstract: A pressure-relief valve especially for use in dams and other hydraulic-turbine installations has a deflecting member that diverts an axially flowing stream outwardly at the discharge side of the valve. This valve has two fluid-operated servomotors, one responding to the water pressure in the system and the other to the pressure of a control fluid. These servomotors are hydraulic cylinders mounted on diametrically opposite hollow ribs inside the housing of the valve body and have pistons interconnected by a common piston rod. An indicating rod extends radially from this piston rod through one of the hollow ribs, and the feed lines for the two cylinders also extend out through these ribs.

Abstract: An extremely fast-acting valve operator including a piston slidable in a pneumatic cylinder and connected by means of a chain and sprocket with the rotatable actuating shaft of a valve so that rapid movement of the piston imparts a rapid rotation to the shaft to open the valve. The piston is subjected to a high pressure gas but is initially restrained against motion within its cylinder by means of a quick release mechanism whereby release of said mechanism results in the piston undergoing immediate and rapid movement responsive to the expanding gas to thereby rapidly open the valve. This abstract is not to be construed in any way to define or limit the invention set forth below.

Abstract: A four-way valve assembly is provided which includes a main valve member operable by pilot valve actuation. A particular feature of the construction of the valve assembly is that the main valve member stroke length may vary over a relatively wide range, enabling the valve to be produced in a variety of sizes, without affecting the pilot valve operation. The main valve member includes a first side and a second side. The first side of the main valve member has a hollow formed in it, while the second side has a flat area formed in it. The flat area is utilized to mount a pilot assembly to the valve. Means for operating the valve assembly are operatively connected to the pilot assembly so as to permit the pilot assembly to move with the main valve while the operating means remains stationary. All connections required for operation of the main valve are carried internally of a valve enclosure.

Abstract: A quick-acting isolating valve including a valve body having a fixed seat defining an opening through which fluid may flow and co-acting therewith a movable head carried on a stem which is provided with a piston reciprocable in a piston chamber formed in the valve body, there being a fluid outlet from the chamber permitting discharge of fluid from the chamber upon movement of the piston within the chamber when the movable head moves toward or away from its fixed seat and means for effecting progressive restriction of fluid flow through the outlet as the movable head approaches the position of abutment with the fixed seat.

Abstract: An actuating device comprises a cylinder of hollow cylindrical form a plurality of pistons respectively of different operational strokes slidably fitted within the cylinder and undergoing sliding displacements in a mutually unitary manner in regions where their strokes overlap and in a separate manner in regions where their strokes differ under driving force due to a working fluid supplied into and discharged from the cylinder interior through ports provided in the cylinder, a working fluid system for supplying the working fluid and having at least one changeover valve for controlling the working fluid supply into and discharge from the cylinder, the piston of longest stroke among the pistons being a driving piston, and a driven shaft coupled to the driving piston thereby to be driven by the sliding displacement thereof. The driving piston undergoes sliding displacement in a noncontinuous manner in multiple stages, whereby the driven shaft is driven in multiple stages.

Abstract: A distributing unit for a dual-action hydraulic electro-distributor of the type comprising, firstly, a distribution stage provided with a bore in which a slide is mounted so as to slide between two end positions with a spring return to a central or neutral position and, secondly, a piloting stage with valves controlled selectively by solenoids, each of the valves being adapted, when actuated, to communicate the feed pressure to the corresponding end of the slide and, when not actuated, to set the corresponding end chamber of the bore to return to the tank, wherein untimely displacement of the slide, e.g.

Abstract: A disk valve which may be rapidly closed through the action of the pressure of the working medium flowing therethrough includes pistons in cylinders on the upstream and downstream sides of the disk and channels for conveying the working medium pressure to the pistons to aid in opening and closing the valve. The channels may include valve means for conveying the pressure to and for venting it from the cylinders as well as a bore through the valve disk itself to connect the upstream side of the disk with the downstream cylinder.

Abstract: Emergency shutoff valve apparatus, including a gate valve assembly actuated to a closed position by fluid pressure acting on an actuator piston, such actuation causing the piston to exert a force through a liquid medium on a power piston to store energy in a spring device or other energy storing means. Relieving of the fluid pressure acting on the piston causes the energy storing means to act through the power piston and liquid medium to shift the actuator piston to a position closing the gate valve assembly. The gate valve assembly can also be shifted to a closed position by supplemental fluid pressure acting on the power piston or on an override piston.