Abstract: Embodiments described herein relate to a gas line cleaning system and a method of cleaning gas lines. The gas line cleaning system includes a connector having a first end and a second end, and a fluid system. The fluid system includes a fluid source configured to flow a fluid through a fluid conduit connected to the first end, and an ultrasonic transducer coupled to the fluid conduit configured to apply an ultrasonic energy to the fluid conduit to agitate the fluid. The ultrasonic energy creates a mechanical energy that reverberates in the fluid conduit and propagates into the fluid to remove particles that may have formed on an inside surface of a gas line connected to the second end and carry away particles inside the gas line.

Abstract: A valve and a bearing surface for a valve and a manufacturing method of the same including a valve body with a main channel extending between a fluid inlet and a fluid outlet, and a closing member provided in the main channel. The valve further includes a shaft connected to the closing member for moving the closing member between an open and a closed position. Moreover, the valve includes at least one bearing surface between the valve body and the closing member or the valve body and the shaft, the bearing surface further including a plurality of cavities filled with solid lubricant.

Abstract: One-way pressure relief valves with wetting fluid reservoirs are disclosed. Valves of the types described herein may be applied to a product package, for example a package containing dry roasted coffee, to allow gas to escape from the package while preventing entry of ambient air into the package. A wetting fluid is provided within the valve to facilitate formation of the seal blocking entry of ambient air through the valve and into the product package. The wetting fluid reservoirs hold wetting fluid to limit or prevent leakage of the wetting fluid from the valve providing benefits such as improved application of the valves to the packages, improved retention of the valves to the packages, and appearance improvements resulting from avoidance of leakage of wetting fluid onto the valve and the package to which the valve is attached.

Abstract: A pressurised headspace beverage closure 1 that may be opened and reclosed in at least substantially a one-handed manner; comprising a drinking aperture, at least one headspace pressure lock mechanism 5, at least one controlled-rate headspace pressure equalisation valve arrangement 6 and a sealing system 7 suitable for multiple re-use, and whereby when the headspace pressure 10 is at least substantially above or below atmospheric pressure the headspace pressure lock mechanism 5 may employ the use of the headspace pressure 10 itself to ensure that the closure cannot freely be opened by a user, whereby the headspace pressure equalisation valve arrangement 6 may freely enable the headspace pressure 10 to be vented such that it may at least substantially equalise with atmospheric pressure at a pre-set and controlled rate preferably independent of a user thereby allowing safe and controlled venting of the headspace pressure 10, and whereby once the headspace pressure 10 has at least substantially equalised with at

Abstract: A control valve includes a valve body having a main valve passageway. A flow control assembly is positioned in the main valve passageway and includes a first control element, and a second control element rotatable relative to the first control element between a closed position, a first position, and a second position. In the closed position, the first and second control elements form a plug which prevents fluid flow through the main valve passageway. In the first position, the first and second control elements collectively define a first control passageway therethrough, and in the second position, the first and second control elements collectively define the first control passageway and a second control passageway therethrough.

Abstract: A ceramic valve with a function of informing the operation position includes casing, a drive device partially and rotatably secured in the casing, a clicker longitudinally mounted to an upper portion of the casing and an outlet control device mounted to a lower portion of the casing for holding the drive device in place, wherein the drive seat extending through the clicker. The clicker informs an operation position by a “click” sound when the outlet control device is driven to a cold water supplying position, a hot water supplying position and a mixing water supplying position.

Abstract: One-way pressure relief valves having a plural-part dry strap are disclosed. One-way pressure relief valves may be applied to a product package to evacuate gas from the package. In embodiments, the plural-part dry strap comprises overlapping dry strap parts which impart improved operation to the valve.

Abstract: The extraction room and ventilation system comprises an extraction room involving opposing supply and exhaust systems that provide a laminar type air flow configured to transmit fresh air flow to said extraction room at a rate of more than 1000 cubic feet per minute at a static pressure of more than 0.5 inch water. The extraction room is configured to use intrinsically safe or Class 1 Division 1, group D electrical appliances; a flammable gas detector, with an alarm and automatic ventilation system connected to said flammable gas detector; and be constructed in accordance with the International Fire Code & International Building Code definition for a One Hour Fire Rated Room construction. In another embodiment the ventilation system may be prefabricated or installed in a standardized movable unit such as a trailer or shipping container.

Abstract: Applicant discloses a thermally actuated valve having a housing, a resilient seat, a thermally conductive piston, a spring fluid seal, and a working material. The housing defines an inlet and an outlet and has two chambers. The seat is adjacent the inlet and the piston is adapted to move towards the seat when a working fluid in the housing warms and expands and away from the seat when a working fluid in the housing cools. By moving away from the seat, fluid flow through the valve is generated. In one application, Applicant's valve acts as a freeze prevention device. In another application, Applicant's valve is used to cool a source of water.

Abstract: A system and methodology facilitates utilization of a valve of a type which may be used as a subsea test tree. The valve comprises a valve element pivotably mounted in a housing having a passageway therethrough. The valve element may be actuated between an open position and a closed position blocking the passageway. A cutter is disposed along a first surface of the valve element and a seal system is positioned for engagement with a second surface of the valve element to provide separate cutting and sealing surfaces. Actuating the valve element from the open position to the closed position enables cutting of a conveyance, that may be positioned through the passageway, while simultaneously forming a seal along a separate surface to sealingly block the passageway.

Abstract: A tubing interface having an elongated tube, an elastomeric ferrule and a support ring device disposed around the ferrule. The ferrule includes a bore which is sized for receipt of the tube. The tubing interface further includes a cap member having an exterior surface, an opposed interior surface, and a tube receiving passage extending therethrough. The receiving passage is formed and dimensioned for axial sliding receipt of the tube member therethrough. The cap member further includes a cup-shaped receiving recess extending proximally from the interior surface, and is formed and dimensioned for axial receipt of the proximal end of the ferrule body member and the support ring. When the cap member is mounted to a valve apparatus, the support ring and the elastomeric ferrule device compressively cooperate with the cup-shaped recess to form a fluid-tight seal between the tube port and a communication port of the valve apparatus.

Abstract: A gate valve includes a valve plate located in a movable manner within a holder, a sealing for sealing off of the valve plate relative to the holder, and a wedge arrangement with several first wedge elements located on the valve plate in its direction of movement at a distance from one another, and second wedge elements belonging to the first wedge elements, by means of which the valve plate is pressed transverse to the direction of movement of the valve plate against the sealing with a movement into a closing position. In order to facilitate a low-friction actuation with a reduced actuation force, also in a compact and space-saving manner, the second wedge elements are supported on the holder, so that they can move relative to the holder.

Abstract: A process for straightening or relaxing hair involving the steps of: (a) providing a hair straightening/relaxing composition containing: (i) from about 0.1 to about 50% by weight of at least one weak non-hydroxide base; and (ii) remainder, to 100%, a cosmetically acceptable medium, all weights based on the weight of the hair straightening/relaxing composition; (b) contacting the hair with the hair straightening/relaxing composition to form treated hair; (c) optionally, rinsing the hair straightening/relaxing composition from the treated hair; (d) optionally, contacting the treated hair with a non-volatile oil; and (e) smoothing the treated hair using a combination of heat and means for physically smoothing hair.

Abstract: According to an embodiment, a valve comprises: a valve member, wherein the valve member is made from a non-deformable material; a seat, wherein the seat: (A) is made from a non-deformable material; and (B) is positioned adjacent to the valve member; a seal, wherein the seal is created by the interaction between at least a portion of the seat and at least a portion of the valve member and a sealant; and at least one recess, wherein the at least one recess: (A) is located on the inside of the seat or the outside of the valve member; and (B) is capable of containing at least one particulate, wherein the valve is capable of being opened or closed via relative movement of the valve member and the seat.

Abstract: Reliably and quickly acting device that can be cheaply employed for monitoring the flow of water vapor, having a water vapor line extending between a switching valve and a cross-section connection, in particular a nozzle, and a temperature sensor monitoring the temperature in the line.

Abstract: The invention relates to a pressure relief valve for a packaging container (3), comprising a base body (4) with a central through opening (9), a sealing surface (14) and a peripheral region (18), wherein the peripheral region (18) may be sealingly connected to an inner side (3a) of the packaging container (3) and the sealing surface (14) has an inwardly tapering form and a membrane (6), making contact with the sealing surface (14) to permit a seal wherein a fluid (5) is arranged between the sealing surface (14) and the membrane (6). The membrane (6) is flexible and a recess (30) is made in the base body (4) into which the central through opening (9) opens out, wherein in the opening region of the central through opening (9), an annular bead (12) projecting in the direction of the membrane (6) is arranged, projecting into the recess (30).

Abstract: A method for controllably delivering hydrocarbon gas, comprises selectively opening and closing a valve to control the flow of hydrocarbon gas from a pressure vessel to a supply line for a hydrocarbon gas-fueled device, detecting any airborne hydrocarbon gas, attempting to move the valve from an open state to a closed state in response to detecting airborne hydrocarbon gas while the valve is in the open state, and releasing a liquid sealant to the supply line in response to detecting escaped gas after at least attempting to move the valve to the closed state.

Abstract: Embodiments of the invention include a system and method for controllably delivering hydrocarbon gas to a hydrocarbon gas-fueled device. According to one embodiment, a valve having an open state and a closed state is used to control the flow of hydrocarbon gas from a pressure vessel to a supply line. A hydrocarbon gas sensor detects airborne hydrocarbon gas and generates a signal in response. A controller automatically moves the valve to the closed state in response to the signal from the hydrocarbon gas sensor while the valve is in the open state. The controller automatically releases liquid sealant to the supply line in response to a continued signal from the hydrocarbon gas sensor after at least attempting to move the valve to the closed state.

Abstract: A rotary valve (1) includes a valve body (2) formed with a chamber communication passage (24) for flowing a main fluid and a vent communication passage (25) for discharging the main fluid and a cylindrical valve member (3) rotatably held in the valve body (2) and formed with a main passage (31) for flowing the main fluid. The cylindrical valve member (3) is rotated to switch the connection of the main passage (31) between the chamber communication passage (24) and the vent communication passage (25). The rotary switching valve (1) further includes a purge gas passage for passing purge gas in a clearance (11) between the valve body (2) and the cylindrical valve member (3), the purge gas being supplied to the clearance (11) to prevent the main fluid from leaking out of the main passage (31).

Abstract: The present invention is directed to an injection molding valve configured to prevent the leaking or stringing of injected thermoplastic from the valve. The valve includes a housing having a first bore along a length thereof and a second bore intersecting the first bore. A rotatable member is inserted through the second bore and is in communication with a lever for the actuation thereof. The rotatable member includes a hole therethrough such that when the hole is aligned with the first bore, thermoplastic may travel freely through the first bore. The second bore further includes at least one groove in communication with a port for receiving injected thermoplastic. The injected thermoplastic is hardened to form an seal therein and configured to prevent thermoplastic from leaking out of the valve housing.

Abstract: The invention relates to a pressure relief valve, comprising a base body, which is covered by a valve membrane. The base body which is located on the inner face of a packaging container, permits the escape of excess pressure from the packaging container into the atmosphere by means of passages and perforations that are configured in the wall of the packaging material. The inventive pressure relief valve thus responds particularly well. i.e. allowing particularly low opening pressures, by means of the special configuration of its base area.

Abstract: A cylindrical rotary valve to control or affect fluid flow in processes where the fluid temperature must be maintained within a target range, the fluid pressure is varied and/or the amount of fluid flow is controlled comprising one or more of the following elements alone or in combination: (i) the use of a temperature control core in the valve shaft, (ii) the contoured or tapered shapes or the conduits (iii) the use of the valve to create predictable pulses or waves in the fluid being controlled, (iv) a modular system of valves where the valve body is fixed and the valve shaft is replaceable with a second valve shaft of different conduit shape, (v) a rotary valve with multiple inputs or multiple outputs for either mixing or diverting of input fluids, and (vi) the use of the valve in abrasive particulate blasting and in particular dry ice blasting.

Abstract: A one-way pressure-relief valve (4) applicable to a package (1) which contains a gas releasing product, said package (1) comprising walls defining a package structure for said product, one of such walls (2) bearing at least one orifice (3) for gases to be expelled, on which orifice the one-way valve (4) is applied, valve (4) comprising a thin flexible bottom sheet (5) provided with an opening (7) and a thin flexible top sheet (6) overlapping bottom sheet (5), wherein bottom sheet (5) is attached to the top sheet (6) in a region defined by the edge of valve (4) and a closed perimeter (7?), the closed perimeter (7?) being defined on a substantially central region of valve (4), surrounding opening (7); a portion of closed perimeter (7?) being located substantially near a portion of the perimeter of opening (7), defining a first sector (8) within which a gas medium is enclosed, and the remaining portion of closed perimeter (7?) is located substantially apart from the remaining portion of opening (5) perimeter, de

Abstract: A valve assembly is provided for venting pressurized gases generated from within an enclosed package during a heating of the package. The valve assembly has a membrane element, a tubular body and a retaining member. The tubular body has an open end, a closed end and a recess defined therebetween. The closed end has an aperture for venting the pressurized gases therethrough. The recess is operative to receive and support the membrane element adjacent the closed end. The retaining member is operative for snap-fit engagement with the tubular body for retaining the membrane element within the recess.

Abstract: A pressure control valve for a packaging container includes a supporting body having a recess a is disposed in an axially captive fashion either by means of gluing or by means of securing projections A device for attaching the pressure control valve to a material web has a stroke die and a sealing die that cooperates with the stroke die and contains a needle holder for producing holes in the material web.

Abstract: A valve seat and a valve assembly incorporating such valve seat form tight dual seals with glass lined nozzle of a reagent or reaction vessel. This reduces or eliminates cavities and crevices between the value seat and the nozzle where residues or contaminants can accumulate. Additionally, the present valve assembly comprises flush ports to permit the valve seat and the valve to be cleaned-in-place. This eliminates the need to disassemble the valve seat and/or the valve to remove the contaminants, thereby minimizing process “down time.

Abstract: Disclosed is a control device for controlling a two-way linear solenoid valve (60) including a pressure regulating port (60p) which communicates with a hydraulic circuit side, a drain port (60d) which communicates with a drain side, a plunger (61) which controls the state of communication between the pressure regulating port and drain port, and a coil (70) which drives the plunger in accordance with an exciting current. The control device has a current generator (65) which supplies the coil with the exciting current corresponding to a duty signal; and a microcomputer (1). The microcomputer determines whether or not a preset foreign matter removal starting condition for removing foreign matter accumulated in the ports has been established.

Abstract: Disclosed is a vacuum preventing device for a scroll compressor comprising: a chamber formed at one side of a fixed scroll and having a suction hole, a compression hole, and a discharge hole at an inner circumference surface thereof; an open/close member installed in the chamber and having a seal oil groove at an outer circumference surface thereof for selectively connecting the discharge hole to the suction hole; and an elasticity member installed in the chamber for providing an elasticity force to the open/close member. The device can enhance a compression efficiency of the compressor by preventing gas leakage efficiently and reduce a fabricating cost by improving a design of a clearance and enhancing a tolerance limit range.

Abstract: A valve for controlling flow of fluid through an aperture in a barrier comprises a valve body including a pin and having a continuous sealing surface surrounding at least one opening through the valve body, and a diaphragm of resilient material. The diaphragm has an opening surrounded by an inner margin and is disposed with the pin extending through the opening and with a main surface presented towards the continuous sealing surface of the valve body. The inner margin of the diaphragm is in a state of tension around the pin of the valve body, whereby the diaphragm is prestressed to a condition in which the main surface of the diaphragm engages the sealing surface of the valve body.

Abstract: A pressure control valve (10; 70) for a packaging container is comprised of a supporting body (11; 71) and a membrane (12; 72). The supporting body (11; 71) has a recess (14; 74) in which the membrane (12; 72) is disposed in an axially captive fashion in the supporting body (11; 71) either by means of gluing or by means of securing projections (81). The invention also describes a device (50) for attaching the pressure control valve (10; 70) to a material web (2, 88). The device (50) has a stroke die (51) and a sealing die (52) that cooperates with the stroke die (51) and contains a needle holder (60) for producing holes (63) in the material web (2, 88).

Abstract: A microfluidic device adapted such that the flow of fluids within the device is controlled by different surfaces of the device having different surface characteristics. Preferably the device comprises a substrate not formed from a hydrated oxide material. The present invention relates to a method for presenting an analyte of a liquid sample as an MS-analyte to a mass spectrometer. More particularly, the method comprises the steps of applying a liquid sample containing the analyte to a sample inlet port of a microchannel structure of a microfluidic device, said structure also comprising an outlet port (MS-port) that is capable of being interfaced with a mass spectrometer, passing the analyte to the MS-port thereby transforming it to an MS-analyte, and presenting the MS-analyte to mass spectrometer via the MS-port.

Abstract: A metering device for liquids, especially for viscous liquids, preferably liquids which are to be metered under sterile conditions, with a plurality of metering pumps which can be simultaneously actuated. To achieve an optimized mode of operation, it is provided that the surfaces on the bottom of the pump holding plate and the top of the metering channel plate are made as adjoining sealing surfaces, forming a seal, that, in the pump holding plate, there is a bypass channel with outlet openings in the sealing surface on the bottom of the pump holding plate for each metering pump and that by the relative displacement of the pump holding plate and the metering channel plate with respect to one another, the outlet openings of the bypass channel can be moved into a position in which the bypass channel connects the respective metering channel to the respective supply channel in the metering channel plate.

Abstract: The seat of a suction valve of a reciprocating compressor is modified to limit the radial extent and thereby the area in which an annular oil film can be established between the valve and the valve seat. The preferred radial extent of the seating surface is 0.014 to 0.018 inches and the preferred ratio of the area of the suction valve seat to the passage therethrough is in the range of 13% to 25%.

Abstract: The seat of a suction valve of a reciprocating compressor is modified to limit the area in which an annular oil film can be established between the valve and the valve seat. The seat is configured to limit the oil film from 3% to 33% of the total inlet port opening. In a modified embodiment gas at discharge pressure exerts an opening bias to the suction valve at the end of the discharge stroke.

Abstract: An improved switching valve has a valve body, a valve control stem, an upper control valve unit and a lower control valve unit, a seal cap and a locking cap. The valve body and the valve control stem are integrally formed of plastics. The lower control valve unit is provided with oil reservoir cavities and oil grooves so as to permit the upper control valve unit and the lower control valve unit to be lubricantly engaged with each other. The flexible seal cap has tapered flange and a concentrically-ribbed bottom surface so that it can be better sealed in operation. The assembly of the switching valve is simple and speedy and the operation thereof is smooth and durable.

Abstract: In addition to seating on its valve seat during the combined compression and discharge stroke, the suction valve seats on the structure associated with the valve seat which has at least one shallow recessed area. In seating on its valve seat, the suction valve seats on the structure defining the shallow recesses to trap fluid therein. The recesses serve to reduce the area available for adhesion and the trapped fluid pressure provides an opening bias to the suction valve. If necessary, or desired, restricted communication between the compression chamber and the shallow recess can take place to provide a higher pressure in the recess at the time of transition from discharge to suction.

Abstract: A spring must be engaged and deformed by the suction valve in order for the suction valve to seat. The spring provides an opening bias to the suction valve with negates most, if not all, of the effects of adhesion due to the presence of a thin oil film between the suction valve and suction valve seat when the suction valve is closed. Accordingly, the opening of the suction valve takes place sooner in the suction stroke and is essentially solely responsive to the differential pressure across the suction valve.

Abstract: A membrane-type inflation nozzle applicable to an inflatable envelope. A release sheet is disposed between two nozzle membranes at an opening of the nozzle. An adhesive material is disposed between inner membrane walls of the opening of the nozzle. One end of the release sheet is positioned between the adhesive material and the other membrane wall. The other end of the release sheet extends out of the opening. When inflating the envelope, the release sheet is torn away from the nozzle opening and then the envelope is fully inflated. Therefore, an internal pressure of the envelope makes the nozzle self-close. In addition, the adhesive material at the nozzle opening is able to adhere corresponding inner membrane walls to each other so as to achieve a more tightly air-sealing effect.

Abstract: The present invention relates to a self-sealing flexible plastic valve for a non-latex balloon, to a balloon incorporating such a valve, to a method of manufacturing such a valve, and to a method of manufacturing a balloon incorporating such a valve. The valve is made from two flexible plastic strips, bonded together along the side edges to define a valve passageway or tube, and having an open inlet end and an open outlet end. The inlet end of one or both valve strips flares or otherwise curls outwardly to facilitate opening of the valve to insert a gas supply mechanism to inflate the balloon.

Abstract: A pressure relief valve for use with flexible containers holding coffee, especially ground coffee, is disclosed. The valve incorporates a unique two piece structural arrangement that requires a low level of precision compared to similar valves. The valve comprises a valve body including a valve chamber having a resilient diaphragm located therein for opening and closing the valve. A set of valve retainers formed integral with the valve body ensure that the diaphragm remains within the valve chamber. A viscous liquid helps ensure an air-tight seal and also acts to retain the diaphragm against a valve seat within the valve chamber. Inlet slots are sized and shaped to effectively prevent coffee grounds from entering the valve without need of a filter or filter paper.

Abstract: An air-ventilating valve is adapted to allow the ambient atmosphere to enter a conduit when the ambient pressure exceeds the pressure of gas in the conduit by a essentially predetermined amount, and which also blocks the release of gas from the conduit to the ambient atmosphere. The valve includes two generally coaxial upstanding valve seat projections (6, 7) which lie essentially in a mutually common plane, and a vertically movable valve body (20) which includes a ring-shaped sealing element (4) which bridges an annular gap (5) between the upstanding projections (6, 7) when the valve is closed and sealingly abuts respective sealing projections (6; 7). The valve body (20) is adapted to move to a valve closed position under the influence of gravity. At least one upstanding projection (6, 7) is formed by two radially separated ridges (31, 32) which define an annular trough (33) therebetween. The ridges (31, 32) are both intended to lie essentially tangential to the sealing element (4) when the valve is closed.

Abstract: A valve for controlling a gas or liquid flow, has an admission and a discharge with a valve seat, a valve part displaceable relative to the valve seat, and a seal therebetween, whereby the valve part presses the seal against the valve seat in one position and thus interrupts the flow. In order to obtain a valve of this type that has a simple structure and exhibits an extremely high sealing power over a comparatively long time span, a liquid having such properties that it is insoluble in the liquid or the gas that flows through the valve serves at least partially as a seal.

Abstract: The present invention discloses a fluid relief device for relieving pressure of a fluid stored in a container or tank, or fluid used in a piece of equipment. In one aspect such a device has a body member with a primary channel therethrough in communication with a container of a contained fluid under pressure. When the pressure of the contained fluid under pressure exceeds a predetermined level, the pressure of the contained fluid moves a cover which is sealingly in place to close off the primary channel. During normal conditions the force of the contained fluid is insufficient to move the cover and leakage of the contained fluid past the cover is inhibited by the provision of a barrier fluid supplied into a barrier fluid chamber to oppose the contained fluid, the barrier fluid at a pressure greater than the normal pressure of the contained fluid.

Abstract: Overpressure valves for packaging containers are supplied in a roll, transported in this form to a packaging machine, separated here and attached to packaging containers by means of an adhesive coated surface. For this purpose the overpressure valves have a layer of emulsion bonding on their underside. To prevent individual layers of the roll from sticking together, the overpressure valves have an adhesive-repelling layer on their top side. The overpressure valves are connected to one another in one piece and in a row, and are separated consecutively in a packaging machine.

Abstract: A multiport fluid flow control valve, particularly for use in a regenerative incinerator system for treating process emissions to remove volatile organic combustibles (VOCs). A valve housing has at least three main conduit connection openings. A butterfly valve element rotatable within the housing on a valve element axis has at least two radially-extending rectangular wings such that different pairs of the main conduit connection openings are in deliberate fluid communication depending on the position of the valve element. To accommodate thermal expansion, there is a gap between the peripheries of the valve element wings and an inner surface of the valve housing. Leakage across this gap is prevented by a valve element structure which cooperates with a portion of the valve housing inner surface to define a plenum. The plenum is either pressurized or forcibly vented. In one form, the structure which cooperates to define a plenum comprises a U-shaped channel element on the peripheries of the wings.

Abstract: A relief valve (6) includes a valve body (5), where a covering disk (1) holding a membrane (2) is completely built in. The axial dimension of the relief valve (6) coincides with the thickness of the valve body (5). The upper surface of the relief valve is flat. The application of the relief valve does not modify the external appearance of a container since the faying surface is also flat.

Abstract: A plug-type gas valve in which a key with a radially extending passageway is supported to rotate between open and closed positions within a bore in a valve body, the passageway establishing communication between diametrically spaced inlet and outlet ports when the key is in its open position. O-rings are positioned in grooves formed in the outer surface of the key above and below the passageway and seal against the wall of the bore in the body to prevent leakage. To lubricate the O-rings and further guard against leakage, grease is injected into pairs of axially extending grease channels formed in the outer surface of the key. To prevent the grease from being blown out of the valve by high pressure when the valve is partially open, one grease channel of each pair communicates only with the upper O-ring groove while the other grease channel of each pair communicates only with the lower O-ring groove.

Abstract: A plug-type gas valve in which a key with a radially extending passageway is supported to rotate between open and closed positions within a bore in a valve body, the passageway establishing communication between diametrically spaced inlet and outlet ports when the key is in its open position. O-rings are positioned in grooves formed in the outer surface of the key above and below the passageway and seal against the wall of the bore in the body to prevent leakage. To lubricate the O-rings and further guard against leakage, grease is injected into pairs of axially extending grease channels formed in the outer surface of the key. To prevent the grease from being blown out of the valve by high pressure when the valve is partially open, one grease channel of each pair communicates only with the upper O-ring groove while the other grease channel of each pair communicates only with the lower O-ring groove.

Abstract: A process and a device are useful for protecting and supporting a seal in a valve arrangement. The device comprises a closure member designed as a slide gate having a translational or rotational movement, a seat region of the valve housing parts corresponding to said closure member, a closure part which can slide in the direction of the degree of freedom of the closure member, and a seal or sealing position which is effective between the closure member and the seat region or which co-operates with the closure part. Said process and device ensure, amongst others, that the seal in a valve arrangement of the type described in the introductory part is protected and supported in positions other than the closed position. To this end, the load on the seal or sealing position which ensures sealing in the closed position of the valve arrangement is applied by the closure part in positions other than the closed position.

Abstract: A shock absorber with a variable damping characteristic has a piston which is reciprocable in a cylinder to divide the oil-filled internal space of the cylinder into two chambers. The chambers are connectable to each other by one or more passages so that oil can flow between the chambers in response to movement of the piston relative to the cylinder and/or vice versa. The piston has several bypasses each of which is controlled by an adjustable electrically operated regulating valve. In order to enhance the accuracy of regulation of flow of oil between the chambers by way of the bypasses, the piston is formed with channels which supply oil between the mobile valving elements and the seats of the valves to thus reduce or eliminate friction between such parts.