Abstract: A valve assembly including a valve housing having a fluid passageway extending through it. The fluid passageway has an inlet portion having a cross-section defined by a substantially annular inlet surface, an outlet portion having a cross-section defined by a substantially annular outlet surface, and an inner chamber portion defined by a substantially annular inner chamber surface, an inner wall, and an outer wall. The inner wall extends inwardly from the inner chamber surface to the inlet surface, and the outer wall extends inwardly from the inner chamber surface to the outlet surface. The inner chamber portion is positioned between and adjacent to the inlet and outlet portions. A valve member is located within the inner chamber portion and is movable between a closed position in which the fluid passageway is blocked, and an open position in which the fluid passageway is not blocked.

Abstract: A double lobed seal comprises first and second annular seals, each having a radially inwardly projecting annular lobe that engages against a sealing surface of a valve element in a valve housing to seal the valve element in its closed position. With increasing fluid pressure exerted on the dual lobe seal, the upstream seal is compressed and moves radially away from the valve element sealing surface. This movement allows the fluid under pressure to enter a void between the two annular seals. The increasing fluid pressure in the void exerts a compressive force on the downstream annular seal that causes its annular lobe to move radially inwardly increasing the force of its sealing engagement with the disk valve sealing surface. In this manner, the dual lobe seal increases its sealing effectiveness when subjected to increasing fluid pressures.

Abstract: An annular valve seal is configured for use in rotational-type valve assemblies with valve housings having an internal annular groove adapted to receive a portion of the seal therein. The seal comprises an annular interior surface and an annular exterior surface generally opposite the annular interior surface. The annular interior surface defines a central opening of the valve seal. A portion of the annular interior surface is adapted for engagement with a moveable valve element when the valve element is in a closed position to prevent fluid flow through the central opening of the valve seal. At least a portion of the annular exterior surface is receivable within the internal annular groove of the valve housing. The annular exterior surface includes a plurality of circumferentially spaced recesses therein or, alternatively, the annular exterior surface of the valve seal may include a plurality of circumferentially spaced projections protruding generally outwardly therefrom.

Abstract: A rotary valve assembly includes a housing for positioning on an engine of the piston and cylinder type. The housing includes an intake passage for conducting a working fluid to the cylinder and an exhaust passage for conducting the working fluid from the cylinder. The housing has an internal cavity which intercepts the intake and exhaust passages, which cavity contains a rotary valve member having a window. The window is so positioned that when the member is rotated, it opens and closes the intake and exhaust passages in a periodic manner. The valve assembly may also include a throttle member mounted in the housing parallel to the rotary valve member. The throttle member has a hole which may be positioned opposite the intake passage.

Abstract: The valve includes a closure disc (34) sealable at its rim to a valve seat (18) so that in this position the seat (18) and rim define between them an annular space (54) which is connected to a port (60) by passages (54, 56, 58) extending through a mating face (e.g. carbon fibre gasket (22)) of the valve seat (18). As shown the space (54) is a recess in the disc rim defined between fibre seal rings (46, 48) but other arrangements are disclosed in which the seal rings and/or recess may be accommodated in the valve seat. The port (60) may be used for leakage detection, pressure monitoring of bleeding or fluid injection.

Abstract: A seat structure for a ball valve which includes a seat member formed by rolling up an alternate stack of a thin steel plate and a thin graphite plate. The seat member is provided with a fixture portion fixed into an inner periphery of the valve body and a ball contact which is in contact with a surface of a valve ball provided between the inflow vent side and the outflow vent side. The seat structure improves an anti-abrasion and enables a secure functioning of the ball valve at a high temperature and high pressure.

Abstract: A fire and smoke damper includes a flat-coil spring actuator to rotate the blades included within the damper between the "normally open" position to the "closed" position when a fire or smoke condition occurs. The damper may include one or more blades, using a linkage connector to ensure simultaneous operation of each blade. The flat-coil spring is held under tension by an actuator (such as a fusible link) to maintain the blades in the "normally open" position. Once the spring is released, a pivot arrangement coupled between the spring and the blade(s) functions to quickly rotate the blade(s) into the closed position, thereby blocking the passage of smoke or fire. The blades may include blade seals to ensure a tight seal.

Abstract: A sprinkler system that includes multiple lawn chemical distributing assemblies that each include a pipe connector member having a water flow passageway formed through the length thereof; a ball valve assembly having a ball valve seal positioned within the water flow passageway of the pipe connector member and an elongated actuator shaft extending perpendicularly from the pipe connector member and terminating in an actuator handle; an exteriorly threaded reservoir connector having a chemical dispersal passageway formed therethrough and into connection with the water flow passageway of the pipe connector member; a cone shaped in-ground chemical reservoir member, the chemical reservoir member having an inverted cone shaped chemical holding cavity, a fill opening rimmed by an externally threaded cap engaging lip, and an internally threaded pipe connection portion companionately threaded to engage the exteriorly threaded reservoir connector, the reservoir member being attachable to the exteriorly threaded reservo

Abstract: An improved device for shifting the seats of a top entry ball valve, consisting of two identical portions, one for each valve seat, which are permanently interposed between the valve body and the relative seats; each portion comprises a stop ring made rigid with the valve body by first locking means, and a seat shifting second ring cooperating with a valve seat and movable axially by operating means into a withdrawn position to enable said valving element to be extracted or into an active position in which it is locked in position by second locking means. Preferred embodiments of said means are also described.

Abstract: A device for coupling two containers comprises a pair of connecting sleeves, each having closing flaps that can be moved from a closed position to an open position by a part-turn actuator, with the outer surfaces of each closing flap facing away from the container lying flush with the outer surface of the relevant connecting sleeve in the closed position and the closing flaps are each seated in an essentially circular seal. To prevent the accidental opening of the closing flaps, each of the connecting sleeves is provided with a radially-movable pin in the wall adjacent the seal, which pin can be pushed radially inward to produce a bulge in the seal which will hold the respective closing flap in its closed position and which pin can be radially moved outward to release the flap.

Abstract: A valve with improved body and plug seats and methods of manufacturing the seats are disclosed. The body seat is separate from the valve body and is adhesively attached to the valve body about at least one of the valve body orifices. The body seat is adhesively attached to the valve body at an angle to compensate for plug-to-body eccentricity. The plug seat is replaceable and is formed of two rigid metallic rings connected by an elastomeric cylinder. The elastomeric cylinder is formed under pressure to reduce potential failure initiation sites.

Abstract: There is provided a hybrid rotary control valve for use on existing rotary concentric control valve, or ball valve, platforms. In particular, the hybrid rotary control valve comprises a concentric valve chamber, adjustable valve seat, eccentric control valve plug, and retainer. In addition, a flexible seal or ring is situated between the adjustable valve seat and retainer to provide adjustable positioning of the adjustable valve seat when installed about a flow channel of the valve chamber and dynamic adjusting of the adjustable valve seat when engaged and disengaged by the eccentric control valve plug. Further, the adjustable valve seat includes an orifice that is offset from the center axis of the valve seat. By rotating the position of the valve seat, the flow characteristic of the control valve may be adjusted in an economical and efficient manner.

Abstract: A filter system for a liquid, which system has a base with an inlet for incoming unfiltered liquid and an outlet for outgoing filtered liquid and a filter subassembly having a filter unit and structure for removably maintaining the filter unit in an operative position on the base. There is a first lead-in port on the base in communication with the base inlet and a first lead-out port on the base in communication with the base outlet. There is a second lead-in port on the filter unit and a second lead-out port on the filter unit. The filter unit further has structure for filtering liquid communicating between the second lead-in port and the second lead-out port.

Abstract: A valve having a continuously adjustable flow rate which can be used in an insufflator. The valve includes an inlet fluidly coupled with a fluid supply, a chamber fluidly coupled with the inlet, a perforated disk, an outlet, and a two-sided dynamic seal arranged about the perforated disk and having a first side fluidly coupled with the chamber and a second side fluidly coupled with the outlet. By varying a rotational velocity (or frequency) of the perforated disk, the flow rate of the valve can be continuously adjusted.

Abstract: A method for manufacturing an improved air damper for a motor vehicle temperature control unit includes a first machining process for injection-molding a sealing section to be formed into a hollow shape. One end of the sealing section is simultaneously injected onto a lower surface of a base member. In a second machining process, the other end of the sealing section is slip-fitted onto the upper surface of the base member and mechanically affixed thereto. To this end, the sealing section preferably has openings which may be positioned over corresponding fixing pins extending from the upper surface of the base member. The fixing pins may then be folded down, for example, by heat welding to lock the fixing pins over the sealing section and thereby form a hollow member. The sealing section further includes a sealing lug for abutting a housing portion of the temperature control unit, such as an interior wall of an air duct.

Abstract: A rotary valve has a wiper member formed from an elastomeric material, the wiper member extending circumferentially of the valve seat, and, in an unstressed condition of the wiper member, extending radially inwardly of said valve seat, the wiper member being operatively positioned for it to wipe clean an outer circumferential surface of the valve member as the valve member is moved from an open position to a closed position, the wiper member being supported for limited movement relative to the valve seat, whereby, upon stressing of the wiper member by the valve member, the wiper member can retract into the valve seat.

Abstract: A stop valve (1) comprises a housing (2) having a passage (15) for a reversible medium flow, which can be stopped by means of a valve body (20) having an annular portion of a sphere as a sealing surface (25) and a flat end portion (26). The transfer area between said sealing surface (25) and said flat end portion (26) having a very small bending radius (r) and the spherical radius (r1) of said sealing surface (25) is smaller than the turning radius (r2) of said valve body. The valve body (20) cooperates with a sealing ring (36), which is annular and surrounds the passage and has an annular body (37), which via a constriction (38) merges into a seat ring (39). The sealing ring (36) is, in the closing position of the valve, exposed with a smaller portion to that passage section, which houses said valve body, and with a larger portion to the other passage section.

Abstract: A vaneless air lock valve including a housing, a hollow rotor having an opening in its cylindrical outer surface, and first and second opposed valve seats each including spherical inner and outer surfaces. A sealing surface extends between the inner and the outer surface. The rotor is supported in the housing to rotate about its major axis, with the valve seats supported by the housing such that the sealing surfaces of the valve seats engage said rotor. In first and second rotary positions the opening is symmetrically positioned with respect to the sealing surfaces of the first and second seats with the inner perimeter of the valve seats substantially coinciding with the opening in the rotor.

Abstract: A flow-control valve has a housing, a valve plate fixed in the housing and formed relative to a direction of flow through the valve with a flat upstream face and with an outlet port opening at the face, and a control plate fixed in the housing and formed relative to the flow direction with a flat downstream face riding on the valve-plate face and with a throughgoing inlet port opening at the face. This control plate is slidable on the valve plate for alignment of the ports and flow through the valve from the inlet port to the outlet port and for misalignment of the ports for restricted flow from the inlet port to the outlet port. A shield plate is fixed in the housing immediately upstream of the control plate and formed with an aperture aligned in the direction with and of generally the same shape as the port of the valve plate. Thus incoming flow will always be confined to a stream aligned with the outlet port of the valve plate.

Abstract: A valve stem and packing assembly is provided in which a rotatable valve stem includes a first tractrix surface for sliding contact with a stem packing and also includes a second tractrix surface for sliding contact with a bonnet. Force is applied by means of a spring, gland flange, and gland on the stem packing so the stem packing seals to the valve stem and bonnet. This configuration serves to create and maintain a reliable seal between the stem packing and the valve stem.The bonnet includes a second complementary tractrix surface for contacting the second sliding tractrix surface, the combination serving as a journal bearing for the entire valve stem and packing assembly. The journal bearing so configured is known as a Schiele's pivot. The Schiele's pivot also serves to maintain proper alignment of the valve stem with respect to the bonnet.

Abstract: The two-way and three-way plug valves disclosed include plug members having O-rings in place in continuous grooves defined by inner and outer side walls and a bottom wall extending therebetween. Recesses are formed at spaced apart points along the O-ring groove inner wall to provide an area into which segments of the O-ring may be displaced during existence of a pressure differential across the O-ring. The O-ring groove inner wall recesses are in fluid communication with one another by means of passages, bores and channels defined by the plug member. Edges along the recesses frictionally engage O-ring segments to restrain same against displacement from the O-ring groove.

Abstract: An improved valve with ball-shaped stopper, comprising a valve housing in which the stopper forms a seal with two faces developing in parallel planes opposite each other and in which the ball-shaped stopper, the stopper handle and the control rod connecting them are formed in a single rigid piece. The stopper component is provided, on the stopper and on the part of the control rod adjacent to it, with a coating of a sealant which forms the seal toward the outside of the valve preventing fluid from leaking, and also forms the seal within the valve which regulates fluid flow.

Abstract: A valve assembly for controlling fluid flow through at least three flowlines comprises a housing having a cylindrical central cavity with at least three ports opening therethrough, the housing further having at least three conduits for making fluid connection between the flowlines and a corresponding one of the ports. A flow control signal is rotatably mounted within the central cavity having at least three radial bores therethrough and intersecting therein for completing a fluid path between selected ones of the ports. A radial seal is supported by the spool and is configured to prevent fluid migration into the central cavity from non-selected ones of the ports. The spool can be positioned to complete a flowpath between any two or any three of the flowlines while the non-selected flowline is positively sealed. The housing and spool are composed of a non-opaque or transparent material to permit direct observation of the fluid passing therethrough.

Abstract: In a liquid directional control valve, a hollow rotary valve element is accommodated in a valve chamber for angular movement about a rotary axis of the rotary valve element. The rotary valve element has first, second and third openings. A liquid passageway formed by the rotary valve element is simple in construction. First seal elements are arranged about first, second and third outlet ports formed in the valve chamber and in close contact with an outer circumferential surface of the rotary valve element. A pair of circumferential grooves are provided respectively in outer circumferential surface sections of respective both ends of the rotary valve element. Each of the pair of grooves has a sloped bottom. A pair of second annular seal element are arranged respectively in the pair of circumferential grooves in concentric relation thereto.

Abstract: The object of the invention is a pair of superimposed ceramic disks (11,12) to open and close screw type valves, one of said disks (11) being fixed and the other one (12) being movable on the fixed disk, where each of said disks presents a slot or opening (15,16) composed by a segment portion (15',16') and by a tapered curved portion (15,",16") extending from one end of said segment portion, the slot or opening (15) of one disk (11) being turned in a direction which is opposite to the direction of slot (16) in the other disk (12), so that when opening the valve the tapered curved portions (15",16") are the first to superimpose to gradually increase the flow of the delivered liquid.

Abstract: A rotary valve assembly having a housing, a valve member and a seal assembly. The seal assembly has at least one seal subassembly with two resilient sealing elements, each having a substantially linear section and a curved section formed integrally with the linear section. The linear and curved sections of the two sealing elements are disposed adjacent each other. The two resilient sealing elements may have different resiliency characteristics.

Abstract: A multiple port valve body has a cylindrical bore with at least two pairs of oppositely disposed inlet and outlet ports communicating therewith and a cylindrical valve member rotatably positioned in said cylindrical bore. Transverse passageways in the cylindrical valve member register with the inlet and outlet ports in a first position and oversize resilient elastic rubber plugs under compression are positioned in oppositely disposed pockets in the cylindrical valve member register with said inlet and outlet ports when the cylindrical valve member has been rotated on its axis approximately 90.degree. to a second position, the resilient elastic rubber plugs acting to bulge into the inlet and outlet ports to insure positive sealing thereof.

Abstract: An improved plug valve wherein a novel shape for the valve plug and valve chamber provide mating surfaces for improved wear characteristics. The novel shape of the valve plug is a frustum of a body of revolution of a curved known as a tractrix, a solid shape otherwise known as a peudosphere.

Abstract: A gasketless seal is provided for fluid-tightly containing a pressurized fluid. The seal comprises a projection extending integrally from a first surface, a groove formed into a second surface and adapted to receive and fluid-tightly, sealingly engage the projection when the first and second surfaces are engaged, and a method for connecting the first and second surfaces together in an engaged relation. The first and second surfaces are constructed of molded plastic, and the groove is tapered so as to narrow inwardly of the second surface.

Abstract: A shut-off/equalizing valve in which a valve core assembly includes an elastomeric seal element molded onto a cylindrical metallic core member. The core member includes an enlarged barrel portion having a cross bore formed therethrough. The seal element is molded onto the barrel portion and includes first and second circumferential ribs adjacent the ends of the barrel portion, one of which lies adjacent to the openings of the cross bore, and pairs of longitudinal ribs in straddling relation to the openings of said cross bore.

Abstract: A dual seal valve having a bubble-tight primary seal and a metal-to-metal secondary seal for sealing engagement with a rotating valve element. The primary seal is preferably a composite seal comprising a relatively hard, high lubricity element bonded to a relatively soft, resilient elastomeric element. The elastomeric element biases the hard element into sealing engagement with the valve element. Several embodiments of the primary seal are disclosed. Tapered inserts are positioned on opposite sides of the valve element, and a seal groove is provided on a tapered outer surface of the insert and adapted for receiving a seal therein. The groove has an enlarged portion which provides a seal relief, allowing deformation and unsealing disengagement of the seal when pressure thereon exceeds a predetermined level. While plug valve embodiments are disclosed, the dual seal arrangement and seal relief are also applicable to ball valves, spherical plug valves, and other valve types having rotating valve elements.

Abstract: A fluid valve for use within a valve fixture such as a kitchen faucet, lavatory faucet or shower/tub control includes a body and a seal support positioned within the body and connected thereto. The seal support has an inlet and an outlet and the body has a discharge which is in alignment with the seal support outlet. There is an annular space defined between an interior wall of the body and an exterior wall of the seal support with there being a piston movable within this annular space and being in substantial contact with the interior wall of the body and the exterior wall of the seal support. The piston has an opening movable into alignment with the body discharge and the seal support outlet to provide a water passage from the seal support inlet to the discharge. There is a valve closing seal extending peripherally about the seal support outlet and in contact with the interior of the piston.

Abstract: Duplex filter apparatus suitable for pressure or suction applications includes dual filter housings and a central valve housing having dual, cylindrical, three-way plug valves. Four glass-filled Teflon sleeve seals, each having an inner cylindrical cut edge conform to the valve periphery and seal the valve openings in either a pressure or suction configuration. A wave spring biases each sleeve seal against the plug valve and further o-ring seals utilize the pressure or suction condition to enhance the effectiveness of the sleeve seals. In the pressure configuration a tubular support is used in conjunction with the sleeve seal with the wave spring acting either directly on the sleeve seal or indirectly through an intermediate metal ring which houses the o-ring seals and which minimizes thermal expansion effects.

Abstract: A plug valve includes a body having an interior wall and fluid passages therethrough with the interior wall having raised ridge portions thereon located in a selected pattern for cooperation with a resilient sealing cover which is molded on a plug body so that when a selected plug body having the cover is inserted into the body the raised surfaces will engage and compress the resilient material to prevent fluid leakage therebetween; the plug member has a fluid passage which, upon rotation of the plug member in the body will be brought into and out of alignment with the fluid passages in the body; the body may have a plurality of fluid pathways which are selectable by selecting a plug member having a selected pathway for providing registry between a desired path of fluid travel.

Abstract: An improved faucet valve utilizes a static diagonal sealing ring which coacts with a control member cylindrical flow control portion having a tapered lower end portion in a relationship that provides: substantially 180 degrees of control member rotation from full open to full close and vice versa, with metering of fluid flow taking place over a major portion of the control member rotational range; contact of nearly all of the sealing ring inner periphery with the control member flow control portion during initial opening and final closing stages when differential pressure is high, so there is no tendency for the sealing ring to be forced out of its grooves; the diagonal sealing ring does not move past a fluid discharge opening or vice versa, so the diagonal sealing ring is not subjected to chafing which would result in excessive wear.

Abstract: A valve consists of a housing provided with a closing opening, a closing member shaped as a part of a ball face, fitted turnably in the housing and resiliently connected to a pivot shaft, and of an annular sealing face. The closing member is connected to its pivot shaft by a resilient member mounted on the pivot shaft.

Abstract: A trunnion type ball valve arranged so that biasing means is not needed to establish a seal between the valve seats and the ball when the valve is in the closed position. There is no load on the valve seats in the open position and a sufficient load in the closed position to effect a fluid seal in the closed position. The valve seats are movably mounted in the valve body so that they are displaced during opening and closing movement, but center themselves in the open and closed positions.

Abstract: An air flow control valve for directing air flow within a house or building. The control valve can selectively direct air flow between two alternative air flow paths. The control valve is of generally cylindrical configuration having an open wall portion or an open wall portion and an open base. The cylinder valve is pivotally mounted within a chamber providing air flow communication through ductwork with at least one thermal source area and at least one area of thermal need.

Abstract: A glass precision valve for use in liquid measuring instruments, the valve comprising a valve body having a conically sharpened head slidably accommodated in a bulged portion, which includes glass tubes at opposite ends, a valve seat provided by the inside wall of the bulged portion, the surface of the valve seat allowing the conically sharpened head of the valve body to be slidable in a liquid-tight manner, and the valve body including a ring-shaped groove around its axis, the ring-shaped groove being filled with an elastic material.

Abstract: The invention resides in a compound valve having utility in a sample injector for a liquid chromatograph. The valve has a pair of rotary spool valves (52, 54), each valve has a shaft (60) with an axial bore (64) in one end and a radial bore (66) communicating with the axial bore. A valve seal (70) surrounds the shaft. A pair of radial passageways (77, 78) in the seal are aligned diametrically and lie in a common plane with the radial bore (66) in the valve shaft. A pinion (62) is fixed to each shaft and a common driving gear (68) engages each pinion to rotate both shafts simultaneously through 180.degree. to place the radial bores in the shafts in communication selectively with either radial passageway in the valve seals.

Abstract: A rotary valve for fluid flow control is provided having curved sealing surfaces, at least one of which has a cross-sectional arc segment forming a portion of an involute, for a valve closure member and a fluid port valve seat or seating surface. By machining the sealing surfaces of the valve closure member and of the valve seat to the form of an involute, these surfaces will engage substantially simultaneously over the entire perimeter of the valve seat at initial closing contact and closed or sealed positions. After initial contact and during overclosure, if elastomeric surfaces are used, the compression and sealing of resilient seating material will be uniform over the entire engaging surface, and around the periphery of the valve seat.

Abstract: A tub-shower diverter valve of the type having a valve body with a cylindrical cavity having inlet and outlet openings and a valve stem having a cylindrical rotatable core portion is provided a seal sleeve made of elastomeric material and incorporating a metal insert. The seal sleeve further incorporates ribs integral with its interior surface and surrounding each of the two seal sleeve outlet openings. The rotatable core portion is provided a bleed opening in a rear end wall.

Abstract: A packing which includes a plurality of seal portions integrally formed on an annular elastic sheet. The seal portions are spaced about the circumference of the sheet and project from one side surface of the sheet. Each seal portion has a through hole extending entirely through the sheet parallel to the center axis of the sheet. In the preferred embodiment, the packing is used in a rotary change-over valve and each seal portion has an annular rib at its free end which is adapted to fit in a corresponding hole in a rotary valve inlet element with the packing held in a recess in the inlet element between the inlet element and a rotary valve outlet element.

Abstract: A sealing device for providing the upstream/downstream sealing of a valve comprising a valving member movable inside the bore of a tubular body and comprising at its periphery a sealing surface coming to bear on a sealing packing mounted in the body at the end of the valving stroke. This sealing packing comprises a dynamic annular sealing element and a coronal metal membrane, whose outer edge portion has flat radial part applied axially against a steep side of a shoulder in the bore of the body, for providing static sealing therewith.

Abstract: An arrangement for top entry ball valve, providing relief from seating load when turning the ball to effect either opening or closing of the valve by a handle connected to the ball via a stem.

Abstract: An improved butterfly valve in which the body flow passageway receives a pair of seat ring retainers, each retainer having a cylindrical sidewall with planar rearward faces and with planar rearward faces which are at an acute angle to the plane of the rearward end faces, the forward end faces having a groove therein. When the retainers are assembled within the valve body a toroidal seat ring can be received in the groove between the retainers. A disc having a circumferential sealing surface is rotatably supported in the valve body to close against the seat ring.

Abstract: A volume control valve in accordance with the invention is formed in a valve body which is adapted for insertion into a valve fitting. The valve body includes a valve seat insert and a valve disk. A sealing element is disposed between the valve seat insert and the valve fitting. The sealing element is carried on a supporting piece such that a first face of the sealing element is disposed on one side of the supporting piece and a second face is disposed on the other side of the supporting piece. The supporting piece is held against shoulders in the body such that the valve seat insert is prestressed by a predetermined amount by the first face. The second face is deformable against the fitting to accomodate different fitting depths.

Abstract: A plug valve and method of making same are provided wherein the valve has an outer housing and a flow passage extending through the housing and including an inlet and an outlet interconnected by a bore therebetween. A plastic sleeve is disposed within the housing and lines the bore and such sleeve has a pair of aligned ports therein which are aligned with the inlet and outlet. A rotatable plug is disposed within the sleeve and such plug has an opening therethrough which is adapted to be rotated in and out of registry with the inlet and outlet.

Abstract: A plug valve and method of making same are provided wherein such valve has lip inserts removably installed between an outer housing of the valve and diametrically opposed ports in a plastic sleeve which serves as a liner for the inside surface of the outer housing. The ports are aligned in a flow passage through the valve and a rotatable plug member is rotatably supported within the sleeve. The lip inserts serve the multiple purpose of protecting edge surfaces defining the ports of the sleeve against impingement of fluid flowing through the flow passage, holding the sleeve against rotation, preventing cold flow or extrusion of parts of the plastic sleeve in the flow passage and providing smooth uninterrupted flow of fluid through the valve flow passage.

Abstract: A control head for controlling the suction path of a suction roller used feeding sheets, cut paper, or the like, wherein the control head is provided with at least one suction and one fresh air conduit and is stationarily mounted adjacent to a rotatable suction roller. Suction holes are provided in the suction roller which discharge into a supply bore which may be connected to a suction air source or an outside atmosphere depending on the position of the suction roller. The control edge of the fresh air conduit is so shaped that, during the overflow of the fresh air conduit, at first only a small cross-sectional opening is provided for venting of the supply bore of the suction roller, which opening gradually increases and finally reaches the full diameter of the fresh air conduit.