Abstract: In a pressure relief valve a valve body, having a lateral exhaust port, is provided with a valve moveable toward and away from a fluid inlet sealing face at its pressure connected end and guided by a valve stem projecting through the other end of the body. A radially projecting arm, connected with the valve body opposite its inlet end, supports a cylinder having a groove therein nesting a lever pivotally connected with the outwardly projecting end of the arm and overlying the outwardly projecting end of the valve stem for receiving at least one endless rupture band therearound and normally maintaining the valve closed. Excessive fluid pressure against the valve pivots the lever out of its groove and expands the endless band beyond its tensile strength limit which unseats and opens the valve.

Abstract: A seat assembly for an expanding gate valve comprising an outer loose fitting main ring (31) with a resilient face seal (41) for sealing against an expanding gate assembly which is mounted in a valve chamber (11) and an inner auxiliary ring (44) fitting loosely in a counterbore recess in the main ring (31) for sealing against the rear wall (35) of a seat pocket (26). An O-ring (61) between opposed surfaces (51, 52) of the rings (31, 44) continuously urges the rings apart and their orientation such that when the gate assembly is expanded in its open and closed positions, the front face (38) of the main ring (31) is flush against the adjacent sealing surface (25) of the gate assembly and the rear face (46) of the auxiliary ring (44) is flush against the rear wall (35) of the seat pocket (26).

Abstract: A safety pressure relief device including a pair of annular disc holders adapted to clamp between them a reverse buckling disc, one of the annular discs being located within the other disc and an arrester bar being disposed within the confines of the other disc member.

Abstract: A sealing structure for use in valves, including butterfly valves, having a body with a flow passage and a movable valve disc in the flow passage. Two sealing surfaces are mounted in the body to engage the disc when it is in a closed position to provide a bubble-tight seal. The sealing structure includes an annular seal retaining cavity with a slot opening to the flow passage. A metal seal ring having a lip portion (which has a first seat) projecting through the slot into the passage is contained within the cavity adjacent to a primary heat-destructible seal ring, which has a second seat. The first seat and the second seat are engageable with the sealing surface of the disc to provide two axial seals. When the valve is closed, a radially-directed force is developed at the second seat (on the heat-destructible seal) and at the first seat (on the lip portion of the metal seal) in response to contact with the disc to effect a heat-destructible seal and a second, metal-to-metal seal, respectively.

Abstract: The invention pertains to a crashworthy valved fitting for interconnecting a tank, such as a fuel tank, with a fluid line wherein valve structure is manually operated, and fluid pressure assists in maintaining the valve in a closed condition. An extension defined upon a Tee fitting body, which may be separated therefrom at a frangible location, is circumscribed by a mounting surface and extends into a tank opening, and the extension side wall includes a plurality of orifices whereby communication between the tank and the fitting is achieved. A displaceable valve selectively seals the extension orifices, and a manually displaceable valve actuator incorporates locking means for maintaining the valve in the open position, and permitting releasing of the valve of for movement to a closed position. Pressure faces defined upon the valve of differential areas subjected to the pressurized medium produces a force for assisting to maintain the valve in the closed condition.

Abstract: An improved in-line sleeve valve comprises a modular tubular port having a stationary plug concentrically supported therein and a reciprocating tubular sleeve arranged for sealing against the stationary plug. A resilient, flexible flange connects the tubular sleeve and the tubular port. The flange is sufficiently elastic to allow easy manual displacement of the sleeve from the tubular stationary plug in order to allow the flow of liquid, but is biased in a first direction so as to return the tubular sleeve to a position abutting the stationary plug upon release thereof.

Abstract: A high speed, horizontal discharge hazard suppression device for preventing fire and explosions in confined zones such as dust collectors is provided which includes a tank having a generally arcuate tubular elbow extending from the underside thereof, and a selectively operable rupture disc mounted at the end of the elbow remote from the tank. The tank and elbow contain a desired fluid suppressant, and the device is mounted in an upright relation such that the suppressant bears directly against the rupture disc. The device serves to deliver suppressant in reduced time as compared with prior horizontal discharge units, and completely eliminates the costly and inefficient delivery pipe usually provided downstream of the rupture disc.

Abstract: A rotary valve for controlling flow of pulverulent solids has diametrically opposed obturators carried on a rotary support and cooperating with respective valve ports in an internal circumferential surface of a cylindrical valve body, the obturators being movable radially and urged by springs against the internal surface of the valve body so as to make a good seal when the valve is closed, while permitting unobstructed flow of material when the valve is open.

Abstract: A valve seal for a cryogenic butterfly valve comprising a reclining U-shaped resilient seal with the annular edge of the longer radially outer leg being gripped in the valve body to form a static seal. Pressure in one direction acts around the outer surface of the seal to pivot it about the static seal against the valve disc. Pressure in the other direction acts between the legs of the seal ring and, because the seal is restrained by the valve body against pivoting away from the valve disc, the pressure separates the legs to bias the radially inner leg inwardly against the valve disc.

Abstract: A fire-safe valve structure for a valve of the type having a valve body with a flow passage (18, 20) therethrough and a valve chamber which houses a valve element (70) for opening and closing the flow passage, the valve chamber becoming sealed off from the flow passage in the open and closed conditions. An annular metallic seat (110) with a port (200), which extends between its inner and outer annular surfaces (186, 188) and so located as to communicate the valve chamber with the flow passage, is disposed in an annular seat pocket (28) formed around the flow passage (20) on the upstream side of the valve. The seat pocket (28) opens to the valve chamber (50) and the metallic seat (110) is provided with sealing means (196) for sealing with the valve element (70) in the open or closed condition.

Abstract: In general pressure regulators for motor vehicle brake systems are arranged in the pressure medium line between the master brake cylinder and at least one wheel brake cylinder. The pressure regulator comprises a plunger valve with different pressure surfaces, which above a certain pressure level, reduce the brake pressure of the rear axle compared to the brake pressure of the front axle. In order to achieve a high reliableness and a simple construction of the pressure regulator, a non-return valve in the form of a sealing lip movable by a movable part of the plunger valve is provided. The sealing lip extends into the inlet chamber when the plunger valve is closed and closes a channel which leads through the valve plunger and/or valve body to the outlet chamber.

Abstract: A safety pressure relief device for a refrigerated liquified gas storage vessel having a large diameter valve seat mounted on the vessel, a valve closure movably mounted to engage the valve seat to close flow therethrough and to move away from the valve seat to relieve pressure in the vessel, a spindle extending through the seat and guided by a spider spanning the seat, a spring within the vessel biasing the valve closure toward the seat and means of preselected strength retaining the valve closure on the seat unitl a preselected maximum desired fluid pressure is reached within the vessel at which time such retaining means fails and valve closure moves to open position to provide large area relief of fluid pressure from the vessel.

Abstract: The invention is an improved self-centering, floating metal seal to be used in combination with a ball valve which controls the flow of fluid in a conduit. The ball valve includes a valve body which has a bore extending therethrough and which also has an inlet and an outlet which are axially aligned and adapted to be mechanically coupled to the conduit. The valve body also has an aperture therein. The ball valve also includes a spherical valve member having a port the axis of which is alignable with the axis of the bore of the valve body and a stem having an inner end mechanically coupled to the spherical valve member and an axially outer end which extends through the aperture of the valve body. The ball valve further includes a device for forming a seal between the aperture of the valve body and the stem.

Abstract: A throttle valve assembly for controlling flow of air through a passage. A housing is provided having a straight flow passage extending therethrough. The housing also has a bore formed therein in intersecting relationship to the passage. A valve is movably positioned within the bore for adjustably restricting the flow of air through the passage. The valve includes an elastomeric sleeve coaxially aligned with and positioned within the bore and being axially movable therealong into a position wherein the sleeve means extends across the passage. Relatively movable abutments coact with the sleeve when the latter is in said position for resiliently deforming the sleeve into at least partial sealing engagement with the housing for restricting or preventing flow of air through the passage.

Abstract: This disclosure relates to the construction of butterfly valves of the type used for controlling fluid flow and, more particularly, to a seal for use in sealing the periphery of the closure member of such valves. Further, the seal disclosed herein is loaded by the pressure of the fluid being handled, to enhance the tightness of the seal.

Abstract: Gate valve having a secondary seal, wherein the gate forms a metal to metal seal with the seat and wherein a resilient seal is moved toward the gate when the gate is in closed position to form a secondary fluid-tight seal with the gate, whereby leakage past the gate is effectively prevented.

Abstract: A low stress stem connection structure (77) for connecting the rotatable stem (43) and the gate member (33) of a non-rising stem type gate valve (1). The stem (43) has an externally threaded end section (47) and the gate member (33) has an externally threaded extension (79) with a longitudinal bore (83) in which the end section (47) of the stem (43) is received. A stem nut (87) is threadably received on the end (47) of the stem (43) and engages the gate member extension (79) to reciprocally move the gate member (33) in response to rotation of the stem (43). The gate member (33) may move relative to the longitudinal axis of the stem (43) in the direction of flow of a fluid through the gate valve (1). A gate nut (97) is threadably received on the gate member extension (79) to hold the stem nut (87) in position on the stem (43) and limit movement of the gate member (33).

Abstract: Improved valve mountings with rotational limiting stops for self-closing breakaway valve assemblies comprising two frangibly connected valve housings each having a rotatable valve member and trigger means holding the valve members open until the valve housings separate. The rotatable valve members have slotted trunnion shafts respectively rotatably received in trunnion bearings mounted to the valve housings. A coil spring is deployed about each trunnion shaft and has one tang end received in the slot of the trunnion shaft to bias the rotatable valve member to its closed position. Indicator shafts keyed with the trunnion shafts are rotatably mounted in the trunnion bearings, the ends of the indicator shafts being exposed to indicate the positions of the valve members.

Abstract: A flow control valve with a valve closure element is provided having at least one annular resilient seat member and an annular flexible metal seat member positioned adjacent to it. The flexible metal seat is held in position by heat resistant gaskets and is biased against the resilient seat member. Upon the failure of the resilient seat to seal because of melting or deterioration caused by exposure to heat, the flexible metal seat member springs into position to provide a fire and heat resistant metal-to-metal seal with the valve closure element.

Abstract: A fire safe disc valve comprising a valve body having a flow passageway therethrough, a disc shaft rotatably mounted in the flow passageway and a disc mounted on the disc shaft, the disc being rotatable to and from a position normally closing the flow passageway by sealingly engaging a disc sealing member. An operating stem, extending through a stem operating aperture in the valve body, engages the disc shaft for rotation thereof, and an elastomeric packer seals the aperture about the operating stem. The disc shaft is displaceable along the flow passageway whereby the disc will close the passageway if the disc sealing member is destroyed, and the operating stem is axially displaceable in the stem operating aperture whereby the aperture is sealed by fluid pressure pressing the operating stem against a stem sealing seat if the stem packer is destroyed.