Abstract: A flow line control valve is provided with internal erosion and corrosion trim liners and means for detecting for leaks in the liners. There is also provided fuller range, positive shutoff throttle means designed to reduce erosion and corrosion of the throttling parts and valve seat. The low flow rate throttling action is provided by progressive and accumulative flow through one or more stages of throttling flow passages of and by a nose end of the throttling means. Preferably the nose end is concavely tapered. Also preferably two or more stages of throttling spaced apart flow passages of increasing size are employed. Postive long lasting shut-off is assured by combining throttling and seat surfaces of different angles of taper.

Abstract: A device is disclosed for effecting shut-off of flow through a tube formed of flexible material. The device includes a block having a bore through which the tube extends and having a resilient sleeve surrounding the tube in the bore and further including a plunger adapted to project through an aperture in the bore wall to engage the resilient sleeve and pinch the tube within the sleeve.

Abstract: A gas flow regulator for gases with condensable components, which delivers ases at constant pressure with constant average composition comprising a gas flow control mechanism, preferably including a spring-loaded membrane bounding a receiving chamber, which is subjected to the pressure of the gases flowing in and which an inlet valve control; and a cooling section connected and vertically oriented to the gas flow control mechanism by which the proportions of the condensable components are held at a partial pressure given by the cooling temperature, and a means for maintaining the gas flow control mechanism at a temperature above the condensation point. A restrictor, preferably an adjustable outlet valve, is connected after the cooling section to help maintain the membrane under pressure by the flowing gas, from which all condensate formed arrives in the region below the regulator directly by action of the force of gravity.

Abstract: An air damper having a housing, a strut mounted across the housing, a pair of damper panels hinged on the strut, and swingable between open and closed positions, an adjustable control above the strut, and, linkage on the upper side of each panel extending to the control to cause the panels to swing from one position to the other.

Abstract: A rotary plug valve has a frusto-conical valve plug (4) received within a frusto-conical valve chamber with a tapered valve liner (3) being provided between the two. The chamber and the plug are oppositely tapered so that by axial movement of the plug the valve liner can be wedged into tight sealing engagement with the external surface of the valve plug and the internal surface of the valve chamber. The liner and the valve plug are insertable and removable as a unit from the frusto-conical chamber.

Abstract: This is a new slide valve arrangement. It includes a housing having a longitudinal axis and a disc valve or gate movable by an external hydraulic or mechanical actuator. The gate slides along a first surface of a guide member. There is a throat member through which the material to be regulated is directed. The throat supports a fixed wedge which is thin on the exterior and has a greater thickness on the interior. A movable wedge having an inclined surface mating with the incline surface of the fixed wedge is provided. Means are provided to position the movable wedge between the guide member and the inclined surface of the fixed wedge such that as the temperature of the valve increases, the movable wedge is forced tighter and tighter between the fixed wedge and the guide member. This give additional compressive strength to the valve.

Abstract: An edge wear tab for high temperature valve components, such valve components having an upstream face and a downstream face. The edge wear tab of the present invention has an increased mounting area for enhanced ease in mounting the tab body with the valve and for increased anchoring of refractory or composite material with the valve component. Further, the edge wear tab of the present invention enhances valve component strength by increasing localized compressive forces in such refractory or composite materials in the area adjacent to such tab body.

Abstract: A valve assembly for securing a valve cover to a valve body includes a fastening arrangement wherein the fasteners are free of tensile stress. In one arrangement, an outwardly extending retaining skirt is disposed about an access opening in a valve body and a cover member is secured to the retaining skirt. Threaded fasteners extend from the cover member and compressingly engage seals about the access opening.

Abstract: A butterfly valve comprises a substantially cylindrical casing (20) having an annular valve seat (A) on its inner peripheral surface, and a valve disk (44) disposed within the casing (20) and rotatable about an axis (35). The valve disk (44) is formed at an outer peripheral edge portion with an annular groove (52) in which an annular valve seal (51) is partially fitted. The valve seal (51) is adapted for pressing contact with the valve seat (A) at a predetermined pressure and anchored in the annular groove (52) by resin (58) pressure-injected into the annular groove (52) through a resin injection channel (53) in communication with the groove. Accordingly, the seal pressure of the valve seal (51) on the valve seat (A) can be set to the predetermined value at all times even if the dimensions of the valve seat (A) and the valve disk (44) and the position of the axis of rotation (35) involve errors.

Abstract: A method for cladding a corrosion resistant high alloy material on surfaces of crossed cavities in a vessel of a high strength metallic material forming a valve casing or the like, the method including the steps of prefabricating first and second cladding structures of generally tubular shapes conforming with the crossed cavities from a thin sheet of a high alloy material; providing grooves on the surfaces of the crossed cavities for receiving corner members of a high alloy material to be located at joined corners of the first and second cladding structures at the intersection of the crossed cavities and end members of a high alloy material to be fitted on end portions of the cladding structures; assembling the first and second cladding structures, corner members and end rings into the crossed cavities; sealing the contacting surfaces of the assembled parts by welding the end members to the vessel and cladding structures; coalescing the assembled parts and the vessel by applying a high pressure to the claddin

Abstract: A backing diaphragm (5) in a diaphragm valve for corrosive liquids is perforated by a centrally positioned, oblong hole. As known to the art a diaphragm valve for corrosive liquids contains a thin Teflon-diaphragm in contact with the liquid, and a thicker backing diaphragm of rubber or the like serving as a cushion. Both diaphragms are in close contact and are attached to a compressor by a stud bolt which is secured in the compressor by a bayonet closure comprising a cross pin in the top end of the stud bolt which is enclosed in a recess inside the compressor. In a known manner, during fitting of a new backing diaphragm the cross pin is inserted into the recess through a slot and rotated about an angle of 90 degrees. The oblong hole facilitates exchanging the backing diaphragm only without having to withdraw the cross pin out of the bolt, which is usually firmly retained therein by rust or dirt, by pushing the cross pin through the oblong hole and inserting it into the compressor.

Abstract: A turn disc valve (10) includes a rigid, sealed, valve body having first and second, parallel, generally coextensive side-wall rigid plates (20 and 22) with a spacing wall (24) sealed between them to define a flat cavity therebetween. A relatively-resilient, high-density polyethylene, flat liner snugly fits inside said housing cavity and is made up of first and second substantially-flat side liner elements (32 and 34), each of a size and shape for substantially covering opposite interior side walls of the flat body cavity, and a spacer insert element (36) positioned between them. The liner defines a circular valve cavity, with the body side-wall plates and the side liner elements defining a fluid passage through the valve. A circular, flat, gate (16) is positioned snugly in the valve cavity but has freedom of rotation.

Abstract: Apparatus for controlling the flow of a hot material, such as gases emanating from a coal gasification plant, in which a ball is rotatable in a housing having a passage therethrough. Rotation of the valve aligns a passage in the valve with the passage in the housing to permit the passage of fluids through the assembly. Conversely, counterrotation of the ball closes the valve to the passage of fluids. Both the housing and ball are provided with channels for the passage of a cooling fluid therethrough, which prevents destruction of rubber seals, reduces erosion by abrasive materials in the gases, and reduces the thermal distortion which results in poor sealing characteristics.

Abstract: The invention relates to a disk valve for corrosive fluids comprising a tubular metal housing lined with a hard-elastic, unpadded coating and a throttle disk with a hard-sealing, unpadded covering being made up of hard synthetic resin and being of a minimum thickness of three millimeters. The throttle disk is attached to two pivot pins extending through said coating and said metal housing and the throttle disk is sealing said metal housing in a transverse plane comprising the axis of said pivot pins. The pivot pins are directly enclosed by separate, hard-elastic sealing bushes seating on the covered throttle disk and being separately adjustable. In order to provide a disk valve which can be applied for a large temperature range and which has no leakages at the sealing bushes as well, the sealing bushes are respectively pressed with wedge-shaped front ends into V-shaped annular grooves of the disk covering.

Abstract: A shutoff valve has a movable flap member rotatably mounted in a valve housing. The valve housing has concentric, spherically-shaped sealing surface zones which cooperate with an edge of the flap member. The housing also has two coaxial couplings and one perpendicular coupling. By rotation of the flap member, flow can be directed from the perpendicular coupling to either of the two coaxial couplings. The three couplings have axes which meet at a common point. The rotational axis of the flap member passes through that common point. The two concentric spherical sealing surface zones are separated by a 90.degree. rotation of the flap member.

Abstract: Apparatus for protecting faucets by enclosing them in a cover which has encased therein rigid foam insulating material with a threaded hook member for holding said cover to the faucet with both halves of said cover being provided with a rubber foam end seal to tightly and completely insulate the faucet.

Abstract: A valve assembly having a tubular valve body defining therein a main supply passage, which tubular valve body has an inlet opening at one end thereof, and an outlet opening adjacent the other end thereof in perpendicular relationship to the main supply passage. A sleevelike socket member is seated within the main supply passage in the vicinity of the outlet opening. The sleeve member has a communication opening through the sidewall thereof in alignment with the outlet opening, which communication opening confines therein an elastomeric seal ring for sealingly engaging the interior wall of the tubular body around the outlet opening. A shaftlike valve member is rotatably seated within the sleeve member and has an L-shaped flow passage which extends axially from the upstream end and then outwardly through the cylindrical sidewall for alignment with the communication opening when the valve member is rotated into its open position.

Abstract: A check valve in which one half of the valve body has a number of integral guide fins extending radially into the flowway. The guide fins are discontinuous from one another at their radially inner ends. A liner on the interior of the valve body follows the contour of the guide fins so that the portions of the liner which cover respective guide fins are likewise discontinuous from one another at their radially inner ends. The thermal properties of the liner differ from those of the guide fins. Each of the guide fins has a transverse bore through which extends an anchoring plug, the plug in turn interconnecting portions of the liner on opposite sides of the guide fins. A valve element longitudinally reciprocable in the flowway includes a closure portion for engagement with a valve seat and an elongate valve stem extending longitudinally from the closure portion and surrounded by and slidably engaged with the lined inner ends of the guide fins.

Abstract: A free-floating neutrally-bouyant, stemless, externally-guided, and abrasion-resistant valve for reciprocating pumps that quickly responds to pressure-gradient reversals across its sealing surfaces. The neutral buoyency is attained by means of a hollow air-tight or nitrogen pressurized valve shaft and lead ballast, whereas the valve is guided directly into its valve seat by means of radial guide fins affixed to the exterior of the valve shaft that centralize the free-floating valve within the valve throat downstream from the valve's sealing surfaces. The sealing surface at the valve is protected against erosion from abrasive fluids by a hardfaced fluid deflector just upstream from its sealing surface, whereas the valve seat is protected from erosion by a hardfaced fluid deflector just upstream from the valve seat.

Abstract: A rotatable valve assembly (38) for a rotary piston filling machine, the rotatable valve assembly being received within a valve body (30). The valve assembly includes a supporting valve plug (40) and interchangeable valve sleeves (42) which are adapted to be telescoped over the valve plug to an assembled position. Alignment means in the form of pins (152) and apertures (154) maintain the sleeve (42) in its desired assembled relationship on the plug (40) and insures that the valve sleeve (42) will rotate with the valve plug (40). The parts can be readily disassembled for cleaning. The valve sleeve (42) may be formed of polytetrafluoroethylene or of Waukesha Metal. The valve plug is preferably made of a stainless steel suitable for use in the food industry.

Abstract: An article for thermally insulating an object, such as a valve found at a well site, includes a housing comprising three housing members which are separable from each other to facilitate connection around the object to be insulated. Two of the housing members which protect the main body of the object to be insulated have at least a double-wall construction, which walls are separated by at least one layer of insulation material. When the three housing members are adjoined, they define a cavity or interior hollow region in which the object to be insulated is placed.

Abstract: A unitary flexible thermal insulation jacket for valves and pipe fittings is disclosed. The jacket is universal in the sense that it properly fits valves and pipe fittings of various manufacturers. It is secured snugly in enclosing to a valve or pipe fitting by attached draw cords, rendering the jacket readily removable, reusable and thermally efficient.

Abstract: A bulk syrup delivery system in which a compartmentized tank delivery truck includes a plurality of separate compartments or tanks, generally one for each of several different types of soft drink syrup. One multichannel delivery hose, having one channel or passageway for each type of syrup, extends from a hose reel on the delivery truck to a delivery receptacle at the account. The account has a plurality of separate storage tanks, each of which is coupled to the delivery receptacle, which is designed to couple to the end of the delivery hose, such that each compartment in the delivery truck couples to the proper storage tank in the account. A plurality of separate check or closure valves are installed in each side of the coupling between the hose and the delivery receptacle, such that flow therebetween is prevented until the valves are opened. The compartments in the delivery truck are pressurized (e.g.

Abstract: A valve molded entirely of resin includes a valve body having an inner housing, a housing cap fitted in the inner housing, a valve element such as a ball, and a stem coupled to the valve element and actuatable to move the latter for providing selective communication between ports in the inner housing and the housing cap. The valve body is covered with a frame molded of resin and substantially covering the exterior surface of the valve body.

Abstract: In order to resist alteration of the spring forces utilized for applying seal pressure between the valve bodies in sliding gate valves for molten metal pouring, particularly those of the manually operated type, the valve support plate and the mounting plate are arranged to form a narrow slot that receives the valve actuator and presents insufficient clearance to permit excessive relative displacement between the valve members. The valve further incorporates releasable attachments, two of which serve as hinge connections for the support plate while the other serves as a latching member. Each of the attachments comprise clevis-mounted eyebolts in which the clevises have predetermined dimensions to establish a fixed, pre-set distance between the plates upon reassembly of the valve after opening and thus insure repeatability of the spatial relationships between the valve bodies and, concomitantly, of the seal pressure between the members.

Abstract: A slide valve for use in a high temperature gas line is described. The valve is constructed to allow field assembly and disassembly for ease of service, and has insulating means and gas purge means for maintaining the exterior of the valve housing at a low temperature. The valve includes a slide plate which can be provided with a flow opening in either a first location such that the slide plate is in tension when the valve is closed while hot or in a second location such that the slide plate is in tension when the valve is opened while hot.

Abstract: In this gate valve, two semi-seal lines between the closure member and the seat cross at the level of the flow axis through the valve. In this way, the overall axial size and the force for operating the valve are reduced.

Abstract: A freeze proof faucet which is adapted to be mounted to an exterior wall and comprises an elongated tubular housing defining an interior housing chamber. The housing is mounted to the wall and the interior end of the housing is connected to the water supply while an outlet is formed on the housing outside the wall. An elongated valve member is longitudinally slidably mounted within the housing and movable from a closed position, in which one end of the valve member sealingly engages and closes a valve seat adjacent the innermost end of the housing, and an open position in which the valve member permits water to flow from the inlet, through the housing and out through the outlet. A valve actuator is threadably mounted to the housing on its exterior end and includes a pusher surface which cooperates with an abutment surface formed on the valve member.

Abstract: Synthetic resinous thermoplastic lines in a diaphragm valve are stabilized against movement by extending the lines into recesses in the bonnet receiving face of the valve body.

Abstract: A plug valve is provided with a stem seal wherein a generally frustoconical face is provided at the juncture of stem and plug and the seal is fixed against the frustoconical face with a predetermined constant load.

Abstract: A gate valve assembly for controlling flow of fine particulate solids, utilizing dual seating surfaces and a slidable gate which are either or both purged by an outflowing gas. The valve body is constructed in two split parts, and the body seat surface contains a conduit spaced outwardly from the seat and having a plurality of spaced openings oriented radially inwardly. The gate contains multiple passageways and is connected to a stem adapted for supplying a flow of pressurized purge gas to the passageways arranged to prevent deposits of the particulate solids passing therethrough on the valve seating surfaces. The valve is usually used for high temperature service, e.g. at 300.degree.-1000.degree. F., the valve body and gate are cooled by a vent gas, and the valve body is covered with thermal insulation material. The valve assembly is usually located within the lower end of an insulated container and controls the flow of particulate solids from the container.

Abstract: A friction reducing guide is provided as an insert in the metal gate of a resilient seated gate valve. The gate is encapsulated almost entirely with rubber except for the guide area. Friction is reduced and any corrosion resistant coating inside the valve body is protected, in the guide area, from excessive abrasion.

Abstract: Disclosed is a control valve for flow of solids or fluids which controls flow over a full range and provides a full opening for solids dumping. The control valve includes an orifice plate, a pair of slides disposed adjacent to and downstream of the orifice plate which are relatively moveable toward and away from one another to closed and open positions, and a flow control port in one of the slides which is closed when the slides are in the closed position and which is progressively opened as the slides are moved away from one another. An exit liner is provided downstream of the slides which centers flow after passage through the control port protecting the downstream side of the valve body from serious erosion. Guides for the slides are spaced apart at the center of the flow passage in the valve so that any buildup of solids are cleared on closing the slides. The wear prone parts of the valve are removable from the valve for repair or replacement without removing the valve from the line.

Abstract: A sliding valve spool and method of making the same for a directional, reversing flow control air valve, such as a four-way valve, a three-way valve, a two-way valve, and the like. A plurality of annular valve members and a pair of annular centering seals are integrally molded on a valve body, in a single molding operation and which function to maintain the center position of the valve spool during use of the same in a valve spool bore in an air valve, and which also provide a sealing function with said bore. The outer, equal diameter peripheries of the molded valve members and the molded annular centering seals are simultaneously ground together with an annular pressure seal groove adjacent each of the annular centering seals.

Abstract: A valve mechanism for low temperature applications comprising an outlet for a low temperature fluid, valve means for opening and closing said outlet, an axially movable rod having one end secured to said valve means and the other end extending outwardly to a normal temperature zone, means for holding said rod, resilient means located in said normal temperature zone for urging said rod toward a position wherein said outlet is closed by said valve means, and means for selectively applying a pressurized fluid to said rod to exert a force counter to said resilient means, whereby said rod and valve means may be displaced and said outlet opened.

Abstract: A butterfly valve resistant to corrosive gases. The valve body carries a valve seat ring having an elastic layer and an inner lining layer composed of polyvinylidene difluoride. The moisture permeability of the elastic layer is higher than that of the lining layer. On the outer surface of the valve seat ring facing the valve body, annular grooves are formed. Through the wall of the valve body, there are formed vents for moisture. These annular grooves and vents for moisture are communicated with each other. When the moisture contained in corrosive gases permeates through the lining and elastic layers, such moisture will easily be drained through the vents. Thereby, moisture permeated through the valve seat ring will not accumulate between the valve seat ring and the valve body. This prevents deformation of the valve seat ring, and extends valve use.

Abstract: Disclosed is a slide valve in which the valve internals, the valve seat, guides and slide valve are maintained in position by a clamping action of an abutment in the valve body and on the valve liner secured in the body by a quick make-up connection. The slide valve is suited for all sizes of valves, both large and small and no screws or other fasteners are needed to maintain the valve internals in position. Advantageously, the guides and slides of the slide valve are maintained out of the flow path, and the valve internals including the orifice assembly with its valve seat and guides, and slide valve with its slides are readily removable through the bonnet area.

Abstract: A non-stick glass stopcock includes a sleeve interposed between a stem tapered body and a tapered valve seat. The sleeve permits operation of the stopcock while eliminating the need for any grease to be located between the stem and valve seat tapered portions. The adjustment mechanism maintains adjustment when the stopcock moves between open and closed positions.

Abstract: The annular cast body 1 of a butterfly valve is coated both internally and externally, including the butterfly shaft and axle passages 12, 13, with an elastomeric material 2 of the same type and hardness at all points of the valve body. The coating has a thickened band 15 which acts as a seat for the butterfly, and is molded around the valve body rather than being glued.

Abstract: An improved glandless plug valve of the type in which a tapered plug fits into a tapered bore in a valve body is provided wherein the tapers formed on the plug and in the body coact to form a body seal. A stem seal is also provided. The stem seal comprises a ring-like sealing member confined within mating grooves in the top of the plug and in a floating seal member. The floating seal member is biased downwardly to effect the seal between itself and the ring-like seal member. The bias force is transmitted to the plug valve urging it into engagement with the body of the valve, to provide a good body seal. In a preferred embodiment, the valve and plug are lined such that the valve is suitable for use in connection with corrosive liquids or slurries. The floating seal provides automatic compensation for temperature induced dimensional changes and for wear.

Abstract: The flap for ventilation ducts, particularly for automobile air-conditioning systems, includes a flap member having opposite surfaces with a predetermined number of openings therein, a longitudinal bottom edge, opposite side edges and an upper edge. A pocket-shaped covering of foam material on the flap member is arranged in two layers which are folded around the longitudinal edge of the flap member onto the opposite surfaces of the foam material including foam sections extending beyond the opposite side edges and the upper edge of the flap member. The layers have a bond-activated foil covering which faces the perforated wide surfaces of the flap, the foil covering connecting the foam-material sections extending beyond the opposite side edges and the upper edge of the flap members. The band activated foil covering further connects the portions of foam-material lying opposite each other at the perforations in the flap member.

Abstract: A valve having a body with a valve chamber therein, an inlet into the valve chamber, an outlet from the valve chamber and an opening to the valve chamber aligned with the outlet, a bonnet secured to the body covering the opening, and having a tubular projection, a valve seat insert having a valve seat positioned in said outlet, a valve member, means for moving the valve member toward and away from the valve seat to control flow from the valve, means for releasably securing the valve seat insert to the bonnet tubular projection.

Abstract: A control valve for an exhaust gas recirculation apparatus for leading part of the exhaust gas from an exhaust line to a suction line. This control valve comprises a throttling member provided in the passage for recirculating exhaust gas, and a valve body the opens and closes the passage of the throttling member. The hole provided in the base of the throttling member has an inside diameter smaller than the hole of the throttling portion. The end portion of the valve body has an outside diameter a little smaller than the inside diameter of the hole of the throttling member, and the length of this end portion in the axial direction is selected so as to allow at least its end to pass the base of the throttling member when the large diameter portion of the valve body is in contact with the base. The thickness of the base of the throttling member in the axial direction is sufficiently smaller than the inside diameter of the hole of the base.

Abstract: A rotary plug valve which is of the type comprising a housing formed of a polymer and a rotary plug disposed in a through-passage of the housing. The plug is formed of a polymer and includes a bore selectively alignable with the through-passage to admit the passage of fluid. The plug valve is formed by forming the plug and attaching thereto a preformed polymeric shield by snap-fitting the shield onto the plug. The shield has an inner surface conforming to the periphery of the plug. The plug and shield assembly is positioned within a cavity of a mold. The cavity corresponds to the shape of the housing. A molten polymer is introduced into the cavity and intimately contacts the shield and forms the housing around the plug.

Abstract: A fuel distribution valve assembly is provided with a laminated thermal buffer member between the valve housing and inner valve means to prevent binding of the valve means from thermal effects.

Abstract: A temperature sensor includes a probe (15) accommodating a charge gas the pressure of which is a function of the temperature thereof, and a number of bellows (65, 75 and 85) or similar pressure responsive devices disposed in a chamber (12) which is thermally isolated from the charge gas. The chamber includes a jacket (150) through which a fluid such as gas turbine engine fuel flows to insulate the pressure responsive devices from ambient temperatures.

Abstract: A flow control valve installation having blind holes in internal surfaces. The holes are slanted in the downstream direction and tuned to null one or more frequencies in the noise spectrum for the valve by the selection of proper depths for the holes.

Abstract: A receptacle for installation in exterior walls of a building for removable installation of a freeze resistant hose bib is shown. The receptacle comprises a tubular element having at one end means to receive and hold a threaded water supply pipe nipple in a clamping relationship with the threaded nipple end thereof inserted axially into the interior of the tube, and at the other end thereof a mounting block means adapted to be secured to exterior wall surface of a building. The tubular element extends into the wall and is adapted to receive through said block after installation in the wall a freeze resistant hose bib. The receptacle is fastened to the exterior wall surface and clamps the water supply pipe permitting subsequent installation and removal of a freeze resistant hose bib for servicing.

Abstract: A control valve assembly to be assembled with a discharge nozzle of a sandblasting abrasive cleaning system or the like, comprising a valve housing having an elongated valve chamber to be connected at an inlet end to a supply conduit, a bulge formation on said housing providing a side compartment laterally communicating with the valve chamber, a circular valve seat at the discharge end of the valve chamber providing a beveled seating surface, a pivot valve member supported for movement into and from the valve chamber having a generally cylindrical valve head and beveled surface to conform to and seat tightly against the seating surface and having an elongated stem portion extending in inclined relation from the valve head, a handle controlled operating shaft journaled in the bulge formation having a linkage yoke member thereon connected to the valve member to tilt it while concurrently moving it arcuately about the shaft upon handle and shaft rotation to retract the valve member substantially fully into the s

Abstract: Disclosed is a valve in which the valve internals, the valve seat, guides and slide valve are maintained in position solely by a clamping action of a quick make-up cylinder having an inlet flow passage into the valve. The valve is particularly suited for small valves as no screws or other fasteners are used to maintain the valve internals in position. Advantageously, the guides and slides are maintained out of the flow path, and the valve internals, including the cylinder, are readily removable through the bonnet area.