Abstract: A valve assembly includes a valve body having a seat-retainer chamber with a floating seat ring disposed adjacent an inner sidewall of the seat-retainer chamber. The floating seat ring is configured to contact a first portion of a plug head at a single annular location prior to a second portion of the plug head contacting a valve primary seat during a closing stroke of the plug head. A static seal is located radially between the floating seat ring and the inner sidewall of the seat-retainer chamber.

Abstract: A seal for use in a fluid control valve includes: a first, elastically deformable, plastic part; and a second plastic part configured as a hard seal element and connected to the first plastic part. The first and the second plastic parts form a seal assembly having a first frontal end configured to bear in a sealing manner on an actuatable valve body of the fluid control valve, and a second frontal end configured to bear in a sealing manner on a valve housing of the fluid control valve, wherein at least the first frontal end has a first end side having an encircling projecting bead configured to seal against the actuatable valve body.

Abstract: A ball valve stopper comprising a spherical contoured body comprising a substantially inelastic first material and having a flow port. A closed face of the spherical contoured body is orthogonal with respect to the flow port and includes a spherical fluid seal area. A rotation support member is aligned orthogonally to the flow port and the fluid seal area. A material discontinuity volume is disposed behind the closed face of the spherical contoured body.

Abstract: A ball valve includes an inner valve unit having a ball valve unit and a valve seat in which the ball valve unit is received. A shaft extends from the ball valve which is clamped between two retainers. The valve seat has a tubular shank and a lateral hole is defined radially through the shank. The shaft extends through the valve seat. The housing is made of metal and has a chamber for receiving the inner valve unit. The housing has an inlet and an outlet which is located corresponding to the lateral hole of the valve seat and the central holes of the retainers. The shaft extends through the installation hole of the housing and is connected with a switch which is operated to rotate the ball valve between open and sealed positions. The water does not contact the metallic parts and the structure is simple and easily assembled.

Abstract: The disclosed embodiments include systems and methods for retaining a seat insert of a ball valve in place within a seat ring of the ball valve. In particular, the seat insert is an annular ring having a tapered section on an outer wall of the annular ring. The tapered section of the seat insert is configured to mate with a shoulder in an outer surface of a profiled groove of the seat ring. The seat insert snaps into the profiled groove with the shoulder, thereby preventing axial movement of the seat insert with respect to the profiled groove of the seat ring. In addition, a locking ring also fits within the profiled groove of the seat ring to prevent axial and radial movement of the seat insert with respect to the profiled groove of the seat ring. More specifically, once the seat insert has been snapped into place within the profiled groove of the seat ring, the locking ring is also inserted into the profiled groove of the seat ring.

Abstract: An electrically insulating valve includes a body housing a valve mechanism. The body has first and second openings in communication with the valve mechanism. The body is adapted to attach to a first pipe so that the first opening is in communication with the first pipe. An electrically insulating insert having a passage there through is connected to the body so that the passage is in communication with the second opening. The electrically insulating insert is also adapted to be attached to a second pipe.

Abstract: A ball valve with single access port includes a ball valve body; a ball disposed inside the ball valve body, the ball having an open inside portion creating a primary passage, an operating position of the ball determining the flow of fluid and pressurized cleaning agent through the valve; a secondary passage configured to allow the flow of the pressurized cleaning agent into the open inside portion of the ball and an access port allowing an external source of the pressurized cleaning agent to be coupled to the ball valve.

Abstract: A plastic ball valve assembly, includes a valve body part including a valve body made of plastic material and having a flow channel passing, a ball member having a through passage therein and rotatably located in the flow channel and a handle member, and a connecting part detachably connecting with the valve body part, including a pair of connecting caps engaged with the two ends of the valve body respectively, a pair of connecting heads made of different materials, each having a head made in different shapes. The multi-use ball is easy to be installed, reliable to be sealed, and strong in practicability.

Abstract: In an embodiment of the present invention, a valve seal for a ball valve includes a ball configured to mate with a tail piece, an annular seat ring to facilitate the mating of the ball with the tail piece, the seat ring having an angled wall having a first groove for accommodating a first seal and a second groove for accommodating a second seal, the first seal having a different Young's modulus from the second seal.

Abstract: A bottom entry plastic ball valve comprises a valve stem cap (1), a valve stem (2), a valve stem sealing ring (3), a valve stem end surface sealing ring (4), a valve ball sealing ring (5), a supporting ring (6) for the valve ball sealing ring, a valve ball (7), a connecting pipe (8), and a valve body (9). A hollow valve ball chamber (911) is provided inside the valve body (9), the valve body (9) is provided with a valve bottom cover hole (912) just below the valve ball chamber (911), and the width of the valve bottom cover hole (912) is larger than the diameter of the valve ball (7). The ball valve also comprises a valve bottom cover (10) corresponding to the valve bottom cover hole (912) so that the valve bottom cover (10) can cover the valve bottom cover hole (912) and can be fusion-bonded to the valve body (9), thereby avoiding the need for electric fusion welding in the manufacture of large-diameter ball valves.

Abstract: A top entry plastic ball valve comprises a valve stem cap (1), a valve stem (2), a valve stem sealing ring (3), a valve ball sealing ring (5), a supporting ring (6) for the valve ball sealing ring, a valve ball (7), a connecting pipe (8), and a valve body (9). A hollow valve ball chamber (911) is provided inside the valve body (9), the valve body (9) is provided with a valve cover hole (912) just above the valve ball chamber (911), and the width of the valve cover hole (912) is larger than the diameter of the valve ball (7). The ball valve also comprises a valve cover (4), which is provided with a valve stem shaft hole (410) for allowing the valve stem (2) to pass through and corresponds to the valve cover hole (912) so that the valve cover (4) can cover the valve cover hole (912) and can be fusion-bonded to the valve body (9), thereby avoiding the need for electric fusion welding process in the manufacture of large-diameter ball valves.

Abstract: A ball valve with single access port includes a ball valve body; a ball disposed inside the ball valve body, the ball having an open inside portion creating a primary passage, an operating position of the ball determining the flow of fluid and pressurized cleaning agent through the valve; a secondary passage configured to allow the flow of the pressurized cleaning agent into the open inside portion of the ball and an access port allowing an external source of the pressurized cleaning agent to be coupled to the ball valve.

Abstract: The present invention provides a ball valve, comprising a valve base, a ball element, a valve shaft and a locking element. The valve base has a containing space opening inside for containing the ball element, and having a lining layer on its inner wall. The locking element is threaded onto one side of the valve base, and correspondingly having a lining layer on its inner wall to separate water and metal materials (mainly refers to lead), in order to prevent contamination from metal material to water.

Abstract: A ball valve includes symmetric first and second valve casings (100) and (200) which respectively have first and second ball seats (120) and (220), first and second coupling flanges (130) and (230), first and second lever receiving parts (110) and (210), first and second ring-shaped grooves (132) and (232), a plurality of first and second coupling holes (131) and (231), and first and second stoppers (111) and (211). The ball valve further includes a ball (400) which is seated in both the first and second ball seats (120) and (220), a control lever (300) which is coupled to the ball (400) to control the ball, and a ring unit (500) which is seated in both the first and second ring-shaped grooves (132) and (232). The ball valve further includes a cap (600) which is fastened to both the first and second lever receiving parts (110) and (210).

Abstract: A fire collar or fire damper for location within a concrete slab of a building. The device incorporates a damper arrangement (12) and a heat detector (18, 19) comprising a metal alloy or lead which melts when a present temperature is reached, causing the damper arrangement to seal off associated pipework or ducting.

Abstract: A ball valve includes a body having a passageway there through with a ball member disposed in the passageway and mounted for selective rotation between valve open and valve closed positions to control fluid flow. A pair of flange grooves are provided in the body on opposite sides of the ball, each flange groove extending radially from the passageway. A pair of seat rings are disposed in the passageway on opposite sides of the ball. Each seat ring has a first sealing surface in contact with an outer surface of the ball and a radially extending annular flange or tab received in an associated one of the flange grooves. The seat design further includes a pair of annular flange seals each disposed in a respective one of the flange grooves. The seat configuration achieves a cantilever effect to improve the temperature and pressure cycling performance of the valve.

Abstract: A fire collar or fire damper for location within a concrete slab of a building. The device incorporates a damper arrangement (12) and a heat detector (18, 19) comprising a metal alloy or lead which melts when a preset temperature is reached, causing the damper arrangement to seal off associated pipework or ducting.

Abstract: A plastic ball valve has a layer of metal film coated on the ball by electroplating. This prevents the ball from directly contacting the inner surface of a pipe housing socket. Microorganisms are prevented from growing at the junction of the ball and pipe housing. When the pipe housing is sleeved on another pipe by applying an adhesive, any adhesive that adheres on the ball is easily peeled off during valve operation. This ensures a smooth regulation of fluid flow through the pipe housing.

Abstract: A non-contaminating gas-tight valve for controlling a flow of granular polysilicon. The valve has a spherical valve member formed from single-crystal polysilicon, so that any particles worn from the valve member during use will be non-contaminating polysilicon. The valve member has a passage through which granular polysilicon flows when the valve is in an open position. When rotated perpendicular to the flow, the passage no longer permits movement of granular polysilicon through the valve. The valve member has a smooth finish and is wiped clean when rotated against non-abrasive upper and lower seats, reducing the likelihood of valve member wear. A cavity between the valve member and the valve body allows for removal of excess granular polysilicon from the valve, inhibiting the valve from seizing due to excess granular polysilicon slipping past the upper valve seat and accumulating within the valve. The valve additionally forms a gas-tight seal between an upstream and downstream side of the valve.

Abstract: Method for preparing melamine from urea via a high-pressure process in which solid melamine is obtained by transferring the melamine melt to an expansion vessel where the melamine melt is cooled by incorporated ammonia. Excess ammonia gas is added to the melamine melt to produce a gas/liquid mixture having a mass ratio of at least 0.01. This two-phase mixture is then sprayed via a spraying means into an expansion vessel, the expansion vessel having an ammonia environment with a reduced ammonia pressure. The melamine melt is cooled and solidified by the expansion and evaporation of the incorporated ammonia to form melamine powder. The melamine melt is thereby directly converted into a melamine powder after which the melamine powder is cooled further and the ammonia pressure is released.

Abstract: A method of producing a valve includes the steps of: providing a mold comprising a pair of mating mold halves, with each of the mold halves including a mold cavity; providing a valve member-stem unit comprising a valve member of substantially circular cross-section attached to a stem, with the valve member including a passageway extending therethrough in a direction generally normal to the stem; inserting a mold core into the passageway of the valve member-stem unit to form a mold insert assembly; positioning the mold insert assembly within the cavity of a first of the mold halves; positioning a second of the mold halves in adjacent contacting relationship with the first mold half such that the mold insert assembly is located within the mold cavities of the first and second mold halves; injecting a polymeric material into the mold half cavities such that a valve casing forms around and captures the valve member-stem unit; and removing the valve casing, the valve member-stem unit and the mold core from the mol