Abstract:
Disclosed is a valve for control of a fluid flow. The valve comprises a valve housing (3) and fluid control means (2) for controlling the flow of fluid through the valve housing (3), wherein the fluid control means (2) is arranged inside the valve housing (3). The valve also comprises shaft means (4) comprising a set of shaft friction surfaces (5, 6), wherein the set of shaft friction surfaces (5, 6) includes a first shaft friction surface (5) and a second shaft friction surface (6) arranged in a mutual shaft friction surface angle (SA). The shaft friction surface angle (SA) is an inside angle between the first shaft friction surface (5) and the second shaft friction surface (6) and the fluid control means (2) is arranged to be displaced along the rotational axis (7) of the shaft means (4) in accordance with a rotation of the shaft means (4). The valve further comprises collar means (8) including a set of collar friction surfaces (9, 10), wherein the set of collar friction surfaces (9, 10) comprises a first collar friction surface (9) and a second collar friction surface (10) arranged in a mutual collar friction surface angle (CA). The collar friction surface angle (CA) is an inside angle between the first collar friction surface (9) and the second collar friction surface (10) and the set of collar friction surfaces (9, 10) are arranged to mesh with the set of shaft friction surfaces (5, 6) and wherein the shaft friction surface angle (SA) and the collar friction surface angle (CA) are between 110° and 175°, preferably between 120° and 170°.
Abstract:
The flow control valve (1) comprises a linearly movable valve member (5) having a first flow regulating surface (7), and a second flow regulating surface (8) facing the first surface (7), the first and the second surface (7, 8) being arranged so that the movement of the valve member (5) changes linearly the flow area be- tween the surfaces (7, 8). The valve (1) further comprises first positioning means (20), which are configured to move the valve member (5) for adjusting the distance between the first surface (7) and the second surface (8), and second positioning means (21), which are configured to switch the valve member (5) or the second surface (8) between a closed position, where the first surface (7) is against the second surface (8), and an open position, where the distance between the first and the second surface (7, 8) depends on the latest position of the valve member (5) determined by the first positioning means.
Abstract:
Ein Pneumatikantrieb weist eine Pneumatikantriebseinheit (1) mit einem zwischen einer ersten und einer zweiten Position bewegbaren Kolben (3) auf. Die Beschleunigung und Abbremsung des Kolbens erfolgt mittels Druckluft, die über Ventilanordnungen (8, 9) mit Wegeventilen (16, 17, 21, 22) der Pneumatikantriebseinheit (1) zugeführt bzw. von dieser abgeführt wird. Im mindestens einem Wegeventil (17, 22) ist eine Dämpfungsdrossel (20, 25) vorgesehen, die einen Differenzdruckkolben (28) aufweist, der in Abhängigkeit des Kompressionsdrucks verschiebbar ist, wodurch der von der Druckluft durchströmte freie Drosselquerschnitt (49) in Abhängigkeit des Kompressionsdruck veränderbar ist.
Abstract:
A gate valve (1) is disclosed for mounting in a pipeline, the gate valve (1) comprising a valve body (3) and a gate (21) mounted in the valve body (3) so as to be movable between an open position, and a closed position where a valve opening (7) formed in the valve body (3) is closed by the gate (21). The gate (21) comprises two opposed faces (24, 25) spaced from the transverse plane (22) of the gate (21), at least one face (24) being provided with at least two seals (41, 43) that each extend around the face (24) one seal being located within the periphery of the other such that both seals (41, 43), when the gate (21) is in the closed position, seal against a seat (5) of the valve body (3) to seal against the pressure of fluid acting on the gate (21) in use. A gate (21) is disclosed having four seals (41, 43, 45, 47) in total, two (41, 43) on the upstream gate face (24) and two (45, 47) on the downstream gate face (25).
Abstract:
A flexible wedge (10) for a gate valve, linearly displaceable within a valve body between an open position and a closed position, comprises a pair of pressure retaining plates (12) and a central wedge body (13) therebetween. The pressure retaining plates have inclined seating surfaces (14) on opposed outer faces thereof for mating with corresponding valve seats within the valve body to prevent substance flow therethrough when the gate valve wedge is in the closed position. The central wedge body is disposed between, and integrally links, the pressure retaining plates. The central wedge body defines at least two offset slots (30) extending partially into the central wedge body from opposed edges thereof and which overlap in a depth-wise direction to define a deflectable web portion between the offset slots. The deflectable web portion permits flexibility of the gate valve wedge, while limiting stress and deformation of the seating surfaces on the pressure retaining plates.
Abstract:
The present invention concerns valve gates for shutting off of pipelines and control of media flow rate through them, in particular, vapor or water having high temperature and pressure, and spindle for the valve gate. Objective of the invention is to enhance reliability and service life of the valve gate for pipelines, and spindle for the same, due to bringing down the corrosion of the spindle and valve gate elements, which come in contact with the spindle through working medium. The objective is achieved by the known valve gate for pipelines, comprising casing (1) with a lid (2), collar tie (3), attached to the casing, spindle (4), made with a threaded section at its upper part and mounted with possibility of displacement by means of collar tie, clamping bar (8), bottom box (9), placed under the bar, and lid with gasket (7), lower end of the spindle being fastened in a yoke (5) attached to a plate interacting with a valve seat (11), the spindle by the invention being made of titanium alloy with oxide layer created on its surface. Oxide layer is created on the surface of the abovementioned spindle up to the threaded section. Use of the spindle made of titanium alloy with oxidized layer in the valve gate substantially decreases corrosion of the spindle and parts of the valve gate, which come in contact with it through the working medium, in consequence of which service life of the spindle and the valve gate increases.
Abstract:
A lifting valve has a one-piece housing (1). The non-circular closure piece (11) is introduced into the housing (1) from the flange side and is connected to a spindle (4) in the region of the valve seat (12).
Abstract:
A high-speed transportation system, the system including at least one transportation tube having at least one track, at least one capsule configured for travel through the at least one tube between stations, a propulsion system adapted to propel the at least one capsule through the tube; a levitation system adapted to levitate the capsule within the tube, and at least one tube sealer arranged along the at least one tube and configured to create an airlock in the at least one tube. In embodiments, the tube sealer may include a gate valve and/or an airbag.
Abstract:
Closing element (1) of a gate valve (2) containing a closure plate (1.1) placed in the body (3) of said valve, said valve comprising a pipe segment (4), a side pocket (5) and guide rails (9), said closing element being slidingly movable along a displacement axis being perpendicular to the central fluid flow axis (x), wherein said closing element possesses at least two pairs of guiding projections (10) of the closure plate (1.1), wherein a pair of lower guiding projections (16) is found on a level that is closer to the lower face seal (14), and a pair of upper guiding projections (17) is found on a level that is closer to a cap (8) of a drive unit (6).