摘要:
Es wird ein Druckregelventil vorgeschlagen, insbesondere zur Regelung des Unterdrucks im Kurbelgehäuse. Dieses Druckregelventil besteht aus einem topfförmigen Gehäuse mit einem Unterteil und einem Gehäusedeckel, wobei sich zwischen diesen beiden Teilen eine Membran 14 befindet. An der Membran ist ein hohlzylindrisches Teil 26 angeordnet, welches ein Zwischenventil umschließt. Dieses Zwischenventil wird durch eine Druckfeder 24 in seiner Ruhestellung gehalten. Die Membran wird über eine weitere Druckfeder 25 in eine obere Ruhestellung bewegt. Bei einem Unterdruck im Ansaugrohr, der einen bestimmten Grenzwert übersteigt, schließt entgegen der Federkraft der Feder 25 sich die erste Ventilöffnung zwischen dem Ventilsitz 17 und der Ventilplatte 18. In dieser Ventilstellung werden die aus dem Kurbelgehäuse abgesaugten Durchblasgase durch die Ventilöffnung 20 geführt. Wird der Saugrohrunterdruck noch weiter erhöht, dann bewegt sich die Membran 14 in Richtung der Ventilöffnung 20 und verschließt bei einem maximal zulässigen Unterdruck auch diese Ventilöffnung. Dieses zweistufig wirkende Ventil ist besonders kompakt und platzsparend aufgebaut und kann je nach Anwendungsfall durch Bemessung der Druckfedern bzw. der Querschnittsverhältnisse auf bestimmte Druckgrenzen eingestellt werden.
摘要:
A flow path switching apparatus in an automatic regulating valve includes a base having a fluid inlet (2) and a fluid outlet (3) which are connected to pipes, and an automatic regulating valve portion (5) having an inflow hole (9) and an outflow hole (11) for a fluid to be controlled. The automatic regulating valve portion (5) is pivotally mounted on the base. A pair of inflow (8) and outflow (10) communication paths for causing the fluid inlet to communicate with the inflow hole and causing the fluid outlet to communicate with the outflow hole are formed in the automatic regulating valve portion. The fluid inlet is connected to or disconnected from the fluid outlet in accordance with a pivot position of the automatic flow regulating valve portion (5).
摘要:
A slidable gate assembly is to be mounted on an exhaust brake having a housing (10) with aligned inlet and outlet apertures (13,14) to allow the passage of exhaust gas through the housing. The flow of exhaust gas is controlled by a slidable valve gate (15) forming part of the slidable gate assembly and having an exhaust gas relief passage (56) therethrough. The valve gate is mounted one end of the piston rod (21) and at that same end there is provided a closure device (60) for opening and closing the exhaust gas relief passage in the valve gate. A biasing force applied through the piston rod (21 preferably by a coil spring (61), biases the closure device (60) towards a closed condition of the exhaust gas relief passage. The piston rod (21) is movable relative to the valve gate (15) to open the exhaust gas relief passage (56) through the valve gate in dependance upon the force applied by the biasing spring (61). The closure device is forced to an open condition by the pressure of exhaust gas applied through the exhaust gas relief passage to the closure device. With this construction the biasing spring (61) can be located at a position remote from the body of the exhaust brake so as to be operable below the setting temperature of the spring.
摘要:
A gate valve has a gate movable between open and closed positions within a valve body, and walls in the gate defining an equalizer port between opposite sides of the gate. The equalizer port is adapted and arranged to be shiftable by actuation of the gate between closed and opened positions and between opened and closed positions.
摘要:
An electro-hydraulic operating system for an extensible boom (10) includes one or more hydraulic cylinders (TC1, TC2, TC3, TC2', TC3') for imparting relative motion between the boom sections (BS, IMS, CMS, OMS, FS) to retract the boom (10) according to an electronically stored program of sequences of movement and speeds. A source of pressurized hydraulic fluid (HT) is fed through appropriate control valves (MC, HV1, HV2, HV3, 50, V1) which include solenoid valves (V1, V2, V3) in fluid communication with a source of pressurized hydraulic fluid (HT). The solenoid control valves (MC, HV1, HV2, HV3, 50, V1) are supplied with control currents proportional to the desired flow rates of fluid to the hydraulic cylinders in order to achieve speed and position control according to the stored program. A metering valve (HV1, HV2, HV3) structure is provided for operation in conjunction with the solenoid control valves (MC, HV1, HV2, HV3, 50, V1). The metering valve (HV1, HV2, HV3) includes an associated pilot valve (52) which receives variable pressure signals from the solenoid control valves (MC, HV1, HV2, HV3, 50, V1) to achieve the metering of fluid to the hydraulic cylinders in proportion to the characteristics of the control current supplied to the solenoid valves (V1, V2, V3). The electrical control signals are such that the hydraulic cylinders (TC1, TC2, TC3, TC2', TC3') may move associated boom sections (BS, IMS, CMS, OMS, FS) at gradually increasing speeds during a starting period of any cycle of movement of the section, at a substantially constant speed during an intermediate period of movement and at a gradually decreasing speed during a stopping period preceding the end of the cycle of movement, thereby providing soft start and soft stop of the sections (BS, IMS, CMS, OMS, FS).