Abstract:
A check valve (54) includes a body (70) defining a passageway through which fuel flows in a first fuel -flow direction during pump operation. The check valve also includes a seat (62), a seal member (58), and a biasing member (66) biasing the seal member toward the seat. The seal member (58) is movable between a first seated position in which the seal member (58) is engaged with the seat (62) and the pressure in the fuel rail is substantially equal to the operating pressure, and a second seated- position in which the seal member (58) is engaged with the seat (62) and a residual pressure in the fuel rail is substantially less than the operating pressure. The seal member (58) and the seat (62) define a leak path between the fuel pump and the fuel rail permitting fuel to flow in a second fuel -flow direction (B) opposite the first fuel -flow direction when the seal member is in the second seated position.
Abstract:
A fuel pressure relief valve (154) includes a body (66) defining a passageway (70) having an inlet end (74) in communication with a fuel pump (30) and an outlet end (78) in communication with a fuel rail. (22) The valve (54) also includes a seal member (82) moveable between a first position in which the seal member (82) is seated against the outlet end (78), and a second position in which the seal member is unseated from the outlet end. (78) The valve (54) further includes a biasing member (86) biasing the seal member (82) toward the second position. The seal member (82) moves from the second position to the first position immediately after fuel pump shutoff to maintain pressure in the fuel rail. (22) The seal member (82) moves from the first position to the second position when fuel in the fuel rail (22) drops to a residual pressure substantially less than the operating pressure to provide a leak path between the fuel pump (30) and the fuel rail (22).
Abstract:
The invention relates to a liquid paint pumping apparatus comprising a piston reciprocable in a cylinder to pump liquid paint during a substantially horizontal pumping stroke of the piston and to charge the cylinder with paint during a reverse stroke of the piston. The apparatus further comprises a check valve disposed within the piston, the check valve comprising: a ball member, a seat, a spring urging the ball member into engagement with the seat, and a plastics cage guiding movement of the ball towards and away from the seat. The seat receives the ball member so as to form a seal to prevent flow of liquid paint between the ball and the seat during the pumping stroke of the piston, and the ball member moves away from the seat during the reverse stroke of the piston.
Abstract:
A valve (100) for regulating the flow of fluid through an access port (106) in a fluid chamber (102) includes a body (110) having a first end (112) and a second end (114), the second end being located in the access port and the first end protruding outside of the access port. An axial bore extends from the first end (112) to the second end (114), an injection fitting (118) is formed at the first end of the body in fluid communication with the axial bore, and the second end of the body includes a selective sealing interface (128). The body (110) forms a sealing interface with a threaded inner wall surface (126) of the access port. A one way valve assembly (136) is positioned within the axial bore, and is arranged to permit a flow of fluid therethrough in a downstream direction and prevent the flow of fluid therethrough in an upstream direction. A bypass passageway (143) extends from the selective sealing interface (128) separate from the axial bore. A connecting passageway (144) connects the bypass passageway (143) with the axial bore upstream of the one-way valve assembly.
Abstract:
Die Hochdruckpumpe weist wenigstens ein Pumpenelement (16) auf, in den beim Saughub eines Pumpenkolbens (20) über ein Einlassventil (30) Kraftstoff aus einem Kraftstoffzulauf (50) angesaugt wird und aus dem beim Förderhub des Pumpenkolbens (20) über ein Auslassventil (32) Kraftstoff verdrängt wird. Das Einlassventil (30) weist ein Ventilglied (44) auf, das mit einer zu seiner Längsachse (45) geneigten Dichtfläche (48) mit einem in einem Ventilgehäuse (40) angeordneten Ventilsitz (42c) zusammenwirkt, wobei durch das Ventilglied (44) in geöffnetem Zustand, wenn dieses mit seiner Dichtfläche (48) vom Ventilsitz (42c) abgehoben ist, zwischen dem Ventilglied (44) und dem Ventilgehäuse (40) ein Durchflussquerschnitt zwischen dem Kraftstoffzulauf (50) und dem Pumpenarbeitsraum (24) freigegeben wird. In geöffnetem Zustand des Ventilglieds (44) ist ein Bereich (52) mit dem kleinsten Durchflussquerschnitt zwischen dem Ventilglied (44) und dem Ventilgehäuse (40) in Strömungsrichtung vom Kraftstoffzulauf (50) zum Pumpenarbeitsraum (24) stromabwärts nach der Dichtfläche (48) des Ventilglieds (44) angeordnet.
Abstract:
A check valve (100) includes a closure member (112), primary (114) and secondary (116) sealing elements, and a spring (110) that urges the closure member (112) into engagement with the primary sealing element (114). The primary sealing element (114) is retained by a groove (126) formed by the housing (102) and the secondary seal element (116). Increasing pressure acting on the closure member (112) compresses the primary sealing element (114) and allows the closure element (112) to engage the secondary sealing element (116). As it compresses, the primary sealing element (114) wipes contamination from the closure member (112) to provide a clean surface for engagement with the secondary sealing element (116). The secondary sealing element (116) also provides redundancy, which is especially beneficial in gas sealing applications.
Abstract:
Kompressor, insbesondere für Klimaanlagen in Kraftfahrzeugen, mit einer Sicherheitseinrichtung zur Hochdruckbegrenzung, wobei die Sicherheitseinrichtung bis zum ersten Ansprechen hermetisch dicht ist und danach den Systemdruck langsam absenkt.
Abstract:
Gattungsmerkmale der Erfindung: Fluidventil, insbesondere fluidisches Riickschlagventil, mit mindestens einem zwischen Offenlage und Schliesslage bewegbaren, mit einem Ventilsitz (VS) am Ventilgehäuse (VG) zusammenwirkenden Ventilkörper (VK), der mindestens eine zur Durchflussachse (XX) konvex gewölbt rotationssymmetrische, insbesondere kugelförmige Dichtfläche (DF). Aufgabe der Erfindung: Schaffung eines Fluidventils, das gegenüber dem Bekannten eine verbesserte Standfestigkeit beim Betrieb mit aggressiven oder abrasiven Medien ermöglicht. Kennzeichnungsmerkmale der Erfindung: a) Für den Ventilkörper (VK) ist eine Führungsfläche (FF) in Durchflussrichtung (PF) mit Abstand von der rotationssymmetrischen Dichtfläche (DF) vorgesehen; b) der Ventilkörper (VK) ist mit seiner Führungsfläche (FF) im Ventilgehäuse (VG) mit einer Schiebepassung wenigstens annähernd parallel zur Durchflussachse beweglich geführt; c) im Ventilgehäuse (VG) ist auf der Seite des Ventilsitzes, die der Offenlage des Ventilkörpers (VK) zugewandt ist, mindestens ein den Ventilkörper wenigstens abschnittsweise umgehender Strömungskanal (SK) angeordnet.
Abstract:
An airless paint sprayer (10) includes an outlet check valve assembly (66) having a dual spring configuration which allows for increased fluid flow through the valve without diminishing response time of the valve (66) or the priming operations of the system. One of the springs (80) is not engaged when the valve (66) is closed and the other spring (82) has a much lower spring rate and biases the valve (66) toward a closed configuration when the valve (66) is open, closed, and all positions therebetween. The dual spring configuration accommodates highly viscous fluids or paints with maximum fluid flow and no detrimental impact on the priming operations of the sprayer (10).