摘要:
A flow control valve comprising a supply line connection and at least one discharge line connection, characterized by at least one fine-control valve whose flow rate is continuously or semicontinuously variable and at least one two-position valve having a minimum flow rate in one stable position and a maximum flow rate in another stable position, the inlet of the or each two-position valve and the or each fine-control valve being in fluid communication with the supply line connection, and the outlet of the or each two-position valve and the or each fine-control valve being in fluid communication with the or each discharge line connection. In accordance with a further elaboration, the flow control valve may comprise a series of two-position valves, with the maximum flow rate of the successive two-position valves in the series doubling in each case, and the minimum flow rate of each two-position valve being zero.
摘要:
Offenbart ist ein Digital-Hydraulik-Ventil mit einer Mehrzahl von digital schaltbaren Einzelventilen, die bezüglich eines Verbrauchers parallel geschaltet sind sowie mit zumindest einem Ausgleichsventil zur Erzeugung von Zwischenwerten zwischen den durch die digital schaltbaren Einzelventile verwirklichbaren Öffnungsquerschnitt-Stufen. Erfindungsgemäß ist das Ausgleichsventil ein Sitzventil, das durch Ansteuerung mit einem Zeit-Schaltschema einen Teilöffnungsquerschnitt kleiner als sein Nennöffnungsquerschnitt bereitstellt. Vorzugsweise folgt das Zeit-Schaltschema dem Prinzip einer Pulsweitenmodulation. Weiter vorzugsweise ist das Ausgleichsventil ein ausgewähltes Ventil aus der Mehrzahl von Einzelventilen des Digital-Hydraulik-Ventils.
摘要:
A system for protecting piping downstream of a wellhead includes an inlet connected to the wellhead and an outlet connected to downstream piping. Two sets of series-connected surface safety valves are in a parallel fluid flow relation to each other and in fluid communication with the inlet. Two vent control valves, which are in fluid communication with each other, each of the two series-connected safety valves and the inlet and outlet of the system, are intermediately connected to the safety valves. Each vent control valve is in fluid communication with a vent line for venting process pressure between surface safety valves through the outlet control valve based on a signal-generating safety logic solver having preprogrammed safety and operational protocols and pressure sensing transmitters attached upstream of the outlet control valve Independent, tight shut-off tests of each series-connected surface safety valve set closes all valves upon electrical or hydraulic failure.
摘要:
This invention relates to a working liquid feeding apparatus for a wire cut electric discharge machine capable of easily adjusting a working liquid feed quantity of each of upper and lower nozzles to an optimum value suitable for a machining mode. The working liquid feeding apparatus, in which pump (11) is connected to inlet ports of first and second three-way change-over valves (61, 62) through a main conduit (12) and first and second sub-conduits (71, 72) and third and fourth sub-conduits (73, 74) are respectively connected to the two outlet ports of each change-over valve, is operated under the state where valve opening of flow regulation valves (81 ∩ 83) of the sub-conduits is adjusted so that the feed quantity of the working liquid through the first and third sub-conduits and the feed quantity of the working liquid through the second sub-conduit are suitable for punching and for end surface machining, respectively, and state where the flow regulation valve (84) of the second sub-conduit is adjusted so that the feed quantity of the working liquid through the fourth sub-conduit is about 10 to 15 % of the feed quantity through the second sub-conduit. Then, the same and suitable amount of the working liquid which is suitable for punching is jetted from the upper and lower nozzles (40, 50) at the time of punching and at the time of end surface machining, on the other hand, the suitable amount of the working liquid for the end surface machining is jetted from the upper nozzle along the end surface of a work and along a wire electrode while a small amount of the working liquid is jetted from the lower nozzle.
摘要:
Exemplary embodiments are directed to devices, methods and systems capable of pressurization, generally involving a flow system that includes a pressurized reservoir, at least one pump including a pump control valve, an outlet port, a shut-off valve and a vent valve. The flow system is configured to be pressurized. The shut-off valve is disposed between the pressurized reservoir and the at least one pump. The vent valve is disposed between the at least one pump and the outlet port. The shut-off valve, the vent valve and the pump control valve of the at least one pump are configured to actuate in a coordinated manner to control a pressurization of the flow system. Exemplary embodiments are further directed to devices, methods and systems for column switching, generally including at least a first column, a second column and a column switching valve.
摘要:
The invention relates to a fuel-supplying system and a pressure regulator for a fuel-supplying system for feeding a fuel from a store to a consumer, and to a method for regulating pressure. The fuel-supplying system for a motor vehicle comprises a storage container that is emptied by a pressure regulator of a regulating unit during the withdrawal. Multiple flow paths lie between a high-pressure chamber of the pressure regulator at the inlet side thereof and a low-pressure chamber of the pressure regulator at the outlet side thereof, said paths being opened and closed, and a pressure drop from the store pressure of the store container to the operating pressure of the consumer occurs during the flow through said paths.
摘要:
A print head includes a fluid cavity and nozzle in fluid communication with the fluid cavity. A stopper is positioned adjacent the nozzle and adapted to control flow of fluid through the nozzle. An arm supports the stopper and is configured to pivotally move the stopper with respect to the nozzle. An electromagnet is positioned adjacent the arm and configured to move the arm toward the electromagnet to open the nozzle.
摘要:
Die vorliegende Erfindung betrifft eine Kraftstoffversorgungsanlage und einen Druckregler für eine Kraftstoffversorgungsanlage zum Zuführen eines Kraftstoffes von einem Speicher zu einem Verbraucher, und ein Verfahren zur Druckregelung. Die Kraftstoffversorgungsanlage für ein Kraftfahrzeug umfasst einen Speicherbehälter, der bei der Entnahme über einen Druckregler einer Regeleinlieit entleert wird, wobei zwischen einem eingangsseitigen Hochdruckraum und einem ausgangsseitigen Niederdruckraum des Druckreglers mehrere Strömungswege angeordnet sind, die geöffnet und verschlossen werden und bei deren Durchströmung eine Druckabsenkung vom Speicherdruck des Speicherbehälters auf den Arbeitsdruck des Verbrauchers erfolgt.