Abstract:
Es wird ein Magnetschieberventil beschrieben. Gemäß einem ersten Beispiel der Erfindung umfasst das Ventil ein Ventilgehäuse mit einer Längsachse sowie einen entlang der Längsachse des Ventilgehäuses verschiebbar gelagerten Ventilschieber, der eine Ankerplatte (31) aufweist. Ein Elektromagnet ist derart im Ventilgehäuse angeordnet, dass er eine Kraft auf die Ankerplatte ausüben kann, um diese von einer ersten Endlage in eine zweite Endlage zu verschieben, wobei die Endlagen durch Endanschläge festgelegt werden. An einem Endanschlag oder an einer Seite der Ankerplatte ist ein halboffener, im Betrieb mit Hydraulikflüssigkeit gefüllter Dämpfungsraum vorgesehen, der durch mindestens eine umlaufende Kante gebildet wird. Ankerplatte und zugehöriger Endanschlag berühren sich entlang der umlaufenden Kante. Bei am Endanschlag anliegender Ankerplatte ist ein Rückstromkanal zwischen Dämpfungsräum und umgebendem Ankerraum vorgesehen.
Abstract:
A spool valve (100) includes a body (102) defining a bore (104) and a positionable spool (106) located within the bore. The spool includes a central body portion (112) having a diameter and a number of sealing lands (118) separated by the central body portion. Each sealing land has a diameter larger than the central body portion diameter. A plurality of flow- shaping rings 8114) are located between first and second sealing lands, and each comprise an intermediate diameter larger than the central body portion diameter and smaller than the sealing land diameter.
Abstract:
A variable performance valve for use in a fuel nozzle is presented. The valve includes a spring, an inner spool having a port, an outer sleeve, and an orifice, which in a fuel nozzle application may be a calibration orifice. In a low flow condition, the inlet to downstream pressure is the spring force divided by the area on which the pressure acts. At low flow the orifice does not cause any appreciable pressure drop. As the flow increases, a pressure drop develops across the orifice. Since the pressure drop across the valve cannot be greater than the spring force divided by valve area, the valve is forced to open to compensate. As flow is increased, the valve will stroke completely open and the pressure drop at the port becomes negligible and the pressure drop across the orifice is nearly 100% of the pressure drop across the valve.
Abstract:
Die Erfindung betrifft ein Ventilteil eines Steuerventils zur Steuerung von Druckmittelströmen, umfassend ein zylindrisches Ventilgehäuse (2) mit einem in Axialenrichtung sich erstrecken ersten Zylindermantelabschnitt (35) und einem senkrecht zur Axialenrichtung sich erstreckenden ersten Zylinderbodenabschnitt, welche einen einseitig offenen Ventilgehäusehohlraum (4) begrenzen, wobei der erste Zylindermantelabschnitt mit einem ersten Arbeitsanschluss (A), einem zweiten Arbeitsanschluss (B) und einem Druckanschluss (P) versehen ist, die jeweils in den Ventilgehäusehohlraum münden, und ein im Ventilgehäusehohlraum axial verschiebbar aufgenommener zylindrischer Steuerkolben (3) mit einem in Axialenrichtung sich erstrecken zweiten Zylindermantelabschnitt und einem senkrecht zur Axialenrichtung sich erstreckenden zweiten Zylinderbodenabschnitt, welche einen einseitig offenen Steuerkolbenhohlraum begrenzen, wobei der zweite Zylindermantelabschnitt, benachbart zum zweiten Zylinderbodenabschnitt, mit einem in den Steuerkolbenhohlraum mündenden radialen Ablauf anschluss (T) versehen ist, und wobei der Steuerkolben so ausgebildet ist, dass die Arbeitsanschlüsse durch Axialverschiebung des Steuerkolbens wahlweise mit dem Druckanschluss und dem Ablauf anschluss fluidleitend verbindbar sind. Das Ventilteil zeichnet sich dadurch aus, dass der Ablauf anschluss des Steuerkolbens wenigstens eine Schrägöffnung umfasst, deren Wandrichtung einen Winkel von kleiner als 90° zur Axialenrichtung einnimmt.
Abstract:
This invention relates to a flow rate control valve device for controlling and supplying a pressure oil flow rate from a pressure oil supply source to a pressure chamber of an actuator such as a hydraulic cylinder of a working machine of construction equipment. The flow rate control valve device includes a main spool (13) inserted slidably into a valve hole bored in a valve main body (10) so as to connect or cut off a main port (11) for controlling a flow rate, which communicates with the pressure chamber of the actuator, with or from a drain port (12) communicating with a tank (25), and equipped with a plurality of notch grooves (23) formed on the peripheral surface of a large diameter portion (14) at one of its ends in an axial direction and a seat (17) formed on one end side; a spring (18) interposed between the deep end surface of the valve hole and one end surface of the main spool and biasing the seat of the main spool to make pressure contact with a seat (19) formed on the valve main body; and a device (20) for pushing the main spool from its other end surface side against the resilient force of the spring in such a manner as to allow the main port to communicate with the drain port through the notch grooves. In this manner, the sliding motion of the main spool (13) can be controlled accurately and finely with high response and high precision flow rate control can be carried out.
Abstract:
An example valve includes: (i) a valve body defining a longitudinal cavity, where the valve body includes a supply inlet and an operating outlet; (ii) a cage disposed in the longitudinal cavity, where the cage includes (a) a first opening fluidly coupled to the supply outlet, and (b) a second opening fluidly coupled to the operating outlet; and (iii) a spool mounted within the cage and configured to move axially therein. When the valve is actuated, the spool moves within the cage to form a gap, thereby allowing pressurized fluid to flow from the supply inlet through the first opening, the gap, and the second opening to the operating outlet. A flow area defined around an exterior peripheral surface of the spool changes upstream from the gap at a first rate, and changes downstream from the gap at a second rate that is different from the first rate.
Abstract:
A spool valve arrangement is described comprising a spool (12) axially moveable along a passage formed in a housing (14) to control communication between ports opening into the passage, and an anti-rotation arrangement (32) operable to resist rotation of the spool (12) relative to the housing (14), wherein the anti-rotation arrangement (32) comprises a roller (40) cooperable with the spool (12) and the housing (14) to resist rotation of the spool (12) relative to the housing (14), the roller (40) being supported such that it extends substantially perpendicularly to the axis of the spool (12). An arrangement is also described in which the spool (12) defines a pair of lands (18a, 18b) cooperable with the housing (14) to define a chamber (20a) therebetween in constant communication with a first port (22) provided in the housing (14) throughout a range of movement of the spool (12) relative to the housing (14), cooperation between at least one of the lands (18a, 18b) and the housing (14) controlling communication between the chamber (20a) and at least a second port (26a, 26b) provided in the housing (14), wherein a distribution step (44) is provided on a part of the spool (12) between the lands (18a, 18b) to enhance the uniformity of the fluid velocity within a part of the chamber (20a) adjacent the said at least one of the lands (18a, 18b).
Abstract:
A valve (30) to be used when blowing air into squeezing pads (12) from a high pressure blower (32), such as a side duct blower, said valve (30) comprising a valve chamber (40) comprising a primary set of openings with a first opening (42) connected to said high pressure blower and a second opening (44) connected to said squeezing pads, whereby air can be transferred through said valve chamber between said squeezing pads and said high pressure blower, said valve chamber further comprising a third opening (46), whereby air from said first opening can pass through said third opening, and where air not passing through said third opening passes through said second opening, said valve further comprising a valve spool for blocking (48) said third opening and thereby changing the amount of air passing through said third opening. The valve spool for blocking said third opening comprises a limiter element (49, 1101), wherein said limiter element and/or said third opening (46, 1103) has a varying diameter along its longitudinal axis (47), where the limiter element is adapted to be inserted along its longitudinal axis in said third opening, and where the extent of insertion of said limiter element changes the amount of air passing through said third opening. The invention further relates to a lift head with the above valve.
Abstract:
A valving arrangement is provided with a specially designed second fluid port which equalizes lateral forces induced upon a spool valve to greatly reduce or eliminate such forces and thereby virtually eliminate laterally induced ware upon the spool valve or a valve port.
Abstract:
A spool valve includes a body defining a bore and a positionable spool located within the bore. The spool includes a central body portion having a diameter and a number of sealing lands separated by the central body portion. Each sealing land has a diameter larger than the central body portion diameter. A plurality of flow-shaping rings are located between first and second sealing lands, and each comprise an intermediate diameter larger than the central body portion diameter and smaller than the sealing land diameter.