Abstract: The valve closure element has an annular peripheral groove opening outwardly onto the periphery of the closure element. An annular sealing element has an annular heel portion disposed in the groove. The latter has an inner end face whose diameter is less than the inside diameter of the heel portion. The groove is defined laterally by two confronting annular faces of the closure element which have a substantially rectilinear generatrix and grip the heel portion so as to prevent relative movement of the heel portion and closure element.

Abstract: A process for controlling a vessel for a repeated pouring of a liquid under low pressure into blind sand moulds. The process comprises after each pouring, lowering the liquid in the pouring tube only to a level which is equal to or substantially equal to a constant predetermined level in the vicinity of the outlet of the tube. According to the invention, the level of the liquid in the tube and the pressure of the driving gas prevailing in the vessel are measured directly and the inlet and exhaust of the driving gas are controlled as a function of these measurements so as to ensure, for all the pourings, a pressure rise time and a pressure drop time which are predetermined and substantially constant. A device is described for carrying out this process.

Abstract: The device comprises an annular case having a first portion which projects from the wall and a second portion which is embedded in the wall. A tubular element connected to two pipes of the piping defines a passage through the case. The tubular element has a first section and a second section respectively located in the first portion and second portion of the case. The tubular element is of a material which is rigid at ordinary temperature and softens under the action of heat. At least the first section is of a fusible material having a distinct point of fusion. The first portion of the case is provided with means for instantaneously closing the passage as soon as the first section has disappeared. The second portion of the case is filled with a material which swells radially under the action of heat.

Abstract: A low-pressure metal repetitive casting apparatus comprising a large capacity fluidtight vessel containing liquid metal to cast, in particular a high melting point metal; an upwardly open supply pipe partly extending into the vessel through a wall of the vessel and having a lower end immersed in the metal; a source of gas under pressure; a device for selectively putting the source in communication with the interior of the vessel and closing off said communication; and a series of blind sand moulds each defining at least one mould cavity, a main runner whose sectional size is in the neighborhood of the sectional size of the supply pipe and communicates with the mould cavity and has a lower open end portion capable of being adapted for connection to an upper end portion of the supply pipe, and at least one secondary runner which puts the main runner in communication with the mould cavity and has a cross-sectional area so calibrated that, during the casting, the solidification time of the secondary runner is sli

Abstract: The installation comprises a first core support pivotable about a fixed axis between a horizontal position and vertical position. The core is mounted on the first support. A second core support having a horizontal axis is provided with a core gripping device and is movable between the first core support, in which it receives the core from the first core support in the vertical position of the first support, and the socket end of a centrifugal casting mould. The two supports are provided with a device for mutually centering the two supports when transferring the core from one support to the other.

Abstract: The process is of the type comprising continuously shaping a mixture of thermoplastic material and crosslinking agent by pressure and then effecting the cross-linking by the cross-linking agent. The cross-linkable mixture is placed inside a sintering zone in which it is subjected to the action of pressure and a sintering temperature at the same time as it is put into shape. It is then conveyed without modification of shape by means of the same pressure to a zone where the cross-linking is effected by a rise in temperature. The device comprises in the following order, along a common axis, a device supplying the cross-linkable mixture, a sintering die and a cross-linking die. These dies define a continuous space in which the pressure is exerted and each comprise heating means.

Abstract: The installation comprises two centrifugal casting moulds which are roughly parallel to each other and are movable by rotation of a common support between a mould preparing station, a pouring station and a pipe extracting station, which stations are disposed in such maner that one of the moulds is in the axial extension of the pouring station when the other mould is in the axial extension of the extracting station and vice-versa. The two moulds are carried by rollers mounted on the common support and the latter comprises a horizontal platform which is rotatable about a central vertical axis relative to which the two moulds are symmetrically arranged.

Abstract: The insulated pipe comprises an inner pipe and a foam of thermally insulating plastics material which adheres to the inner pipe and to an outer protective layer. The foam material covers the major part of the inner pipe but terminates at a distance from each end thereof in a portion having an inclined surface of frustoconical shape. The outer protective layer comprises a cover which is relatively rigid and terminates before reaching each frustoconical surface and a protective case for each frustoconical surface of the foam material. The case is at one end fixed to the cover and at the other end integral with the inner pipe. The case has sufficient elasticity to allow the foam to follow the expansion of the inner pipe while the cover remains immobilized.

Abstract: The device comprises a case of a material non-deformable under the effect of heat and mounted on the wall around at least a part of the tube. A mass of material capable of swelling under the effect of heat is enclosed in the case. An element of a material which is substantially non-fusible at temperatures which are developed in the course of a fire has a part which is planar and perpendicular to a radial direction relative to the tube and is movable and slidable in said radial direction in the case. The element normally bears on the outer surface of the tube and the mass of swelling material is disposed on the opposite side of the element to the tube.

Abstract: The method comprises applying on the surface of each of the parts a thin layer of a curable first mixture containing a first resin which cures slowly and is slightly exothermic and has a good adherence to said surfaces. A curable second mixture is then introduced in a space defined by the layers of the first mixture in the final position of the two parts. The second mixture contains a second resin which cures rapidly and is sufficiently exothermic to promote the curing of the first resin and normally has after curing a poor adherence to said surfaces but a good adherence to the first resin.

Abstract: The valve closure element has an annular peripheral groove opening outwardly onto the periphery of the closure element. An annular sealing element has an annular heel portion disposed in the groove. The latter has an inner end face whose diameter is less than the inside diameter of the heel portion. The groove is defined laterally by two confronting annular faces of the closure element which have a substantially rectilinear generatrix and grip the heel portion so as to prevent relative movement of the heel portion and closure element.

Abstract: The sealing element comprises an annular active portion of elastomer material adapted to be compressed radially between the outer surface of a male end and the wall of a cylindrical recess in a socket in which the male end extends and means for anchoring the sealing element in the socket, the active portion comprising an outer annular face, an inner annular face and an end face having, when the sealing element is at rest, a minimum inside diameter exceeding the outside diameter of the male end and a maximum outside diameter exceeding said minimum inside diameter by an amount exceeding the radial clearance between the recess and the male end. The end face is connected to each one of the annular faces of the active portion by a circular edge, and, when the sealing element is in the free state, in axial section, the rise or dip of the arc generating the end face is at the most equal to 1/5th of the length of the associated chord.

Abstract: The machine comprises a housing, a casting mould rotatably mounted in the housing and a device for axially placing and maintaining a core against the end of the mould. The device comprises an element for urging the core against the mould, a releasable mechanism for fixing the core to the element and means for shifting the element between a position in which it urges the core against the mould and a withdrawn position. According to the invention, the mechanism is movable on the housing between a position in which it fixes the core to the element when the latter applies the core against the mould and a withdrawn position, the arrangement being such that the mechanism can follow, between its withdrawn position and its other position, the movement of the means for shifting the element. A return element is provided for returning the mechanism to its withdrawn position.

Abstract: The device comprises cooling water spraying systems extending throughout the length of the mould for cooling the latter. At least one additional local cooling water spraying element is slidably mounted on a guide bar through a slide. The bar is parallel to the mould and the local spraying element is adjustable in position on the bar for each casting for further cooling a selected part of the mould.

Abstract: In a spraying container structure, before the sealing and blowing operations there is mounted in the valve body comprising a housing and a cover which is provided with a temporary sleeve, a closure member which is adapted to cooperate with a sealing element to close the valve. The closure member is maintained in the valve open position in the valve body during the production of the container.

Abstract: Machine for injecting and blowing a plastics material into hollow bodies. It comprises a rotary polygonal-sided turret which carries on each side a set of support members for the plastics material which are made to pass step-by-step to an injection station for injection of a blank and a blowing station for blowing the material into a hollow body in passing through intermediate stations including a transfer station. A rotatable oven structure having sockets rotatable step-by-step about an axis of the oven structure is located adjacent the transfer station for transferring the sets from the turret to the oven structure and, after a complete rotation about the oven structure axis, transferring the sets from the oven structure to the turret. Each turret side and each socket of the oven structure receives a respective one of the sets which is fixed to the turret or oven structure in a removable manner to allow the mentioned transfer.

Abstract: The valve is of the type having a body and a butterfly valve closure member. One of these parts has an annular sealing element which is retained in a cavity with which it defines an annular chamber. The other part has an annular surface for contacting the sealing element when the valve is closed. A conduit puts the chamber in communication with the upstream side of the closure member when the latter is in its valve closing position. According to the invention, an exhaust conduit is provided for putting the chamber in communication with the downstream side of the closure member when, and only when, the closure member is not in its valve closing position.

Abstract: This process for manufacturing spheroidal graphite cast iron pipes by centrifugal casting has the feature that the rate of the cooling of the liquid iron just centrifugally cast in a tubular layer is increased from a zone of the layer spaced away from the mould to the free inner surface of this tubular layer while the cooling of the liquid iron in the vicinity of the surface of the mould is slowed down.

Abstract: The control device comprises an electric motor whose rotor drives a rotary spindle which shifts the closure member of a valve. Means are provided for detecting the stoppage of the rotation of the spindle. Switching means for opening the supply circuit of the motor are responsive to the detecting means so as to stop the supply when the spindle stops rotating.

Abstract: This installation has an extracting carriage provided with an extracting tongs. The extracting carriage is provided with means for driving the extracting tongs in rotation at the same speed as the mould. Consequently, in the extraction of large diameter cast iron pipes not intended to be annealed there is no risk of the pipes becoming oval.