摘要:
The invention relates to a method and to a device for controlling at least one valve. Once a leakage in the system comprising said valve is detected, a control signal is produced that shortly opens and closes the valve for flushing, or that forces the valve ball onto the valve seat at high speed.
摘要:
An automated smear making apparatus used to prepare and smear samples on glass slides. In some embodiments a smearing subsystem generally includes a smear cartridge having an input reel, a deflection component, a take-up reel, and a smearing tape. The smearing tape may include a plurality of perforations formed therein. The smearing tape may be wrapped around the deflection component such that each of the plurality of perforations forms a blade that extends from the smearing tape to expose a smear surface as the smearing tape is drawn into the take-up reel. A slide transport surface is also provided to move a slide across the smear surface.
摘要:
The invention relates to an apparatus for driving an electrically operable valve which has a valve coil (1a, 1b), comprising: a main switch (5a, 5b), which is arranged in the electrical circuit of the valve coil (1a, 1b), for setting the current flowing through the valve coil (1a, 1b), and a freewheeling path (6a, 6b) which is connected parallel to the valve coil (1a, 1b) and has a freewheeling diode (3a, 3b). The invention provides a freewheeling switch (2a, 2b) by means of which the freewheeling path (6a, 6b) can be interrupted or closed. As a result, it is possible to operate the valve selectively in a PWM mode or in a switching mode.
摘要:
Die Erfindung betrifft ein Steuerventil für eine indirekt wirkende Druckluftbremse eines Schienenfahrzeuges, umfassend ein pneumatisches Relaisventil (4) zur Steuerung eines Bremszylinderdrucks (C) über einen Vorsteuerkreis (1) zur Erzeugung eines zeitlich definierten Vorsteuerdrucks (c v ) für die proportionale Ansteuerung des Relaisventils (4), wobei eine dem Vorsteuerkreis (1) vorgeschaltete Einrichtung zur Erzeugung der Brems- und Lösezeiten der Druckluftbremse vorgesehen ist, wobei die Einrichtung zur Erzeugung einheitlicher Brems- und Lösezeiten der Druckluftbremse Mittel (T) zur Realisierung eines Volumenstroms mit konstanter Druckänderung für die Druckluftversorgung (R) sowie die Entlüftung (0) des Vorsteuerkreises (1) aufweist.
摘要:
The aim of the invention is to adjust a residual air gap (a) between an anchor (18) and a pole piece (12) of a magnetic valve (10). To this end, the magnetic valve (10) is partially assembled in such a way that a tappet (14) can still be accessed. The tappet (14) is pressed into a closing position against a valve seat (26) and an axial stopper (20) of the tappet (14) is formed by means of a sonotrode (58) and ultrasound treatment for instance to such an extend that the stopper (20) protrudes from the pole piece (12) by the desired residual air gap.
摘要:
The invention concerns a solenoid valve (15,16) including a fixed core (110), a movable core (120) and a coil (130). A first valve seat member (140) and a second valve seat member (150) are fixed in the fixed core (110) and a valve body member (170) is disposed therebetween. A spring member (180) is interposed between the valve body member (170) and the second valve seat member (150) such that the valve body member (170) is normally seated on the first valve seat member (140). The valve body member (170) can move away from the first valve seat member (140) to be seated on the second valve seat member (150), by being pushed by the movable core (120). A guide member (160) holds the valve body member (170) and the spring member (180) to the second valve seat member (150) so as to limit the movement of the valve body member (170) away from the second valve seat member (150). The invention further concerns a fabrication method for the above solenoid valve (15,16) and its application in a vehicle brake hydraulic pressure control apparatus (A).
摘要:
An automated smear making apparatus used to prepare and smear samples on glass slides. In some embodiments a smearing subsystem generally includes a smear cartridge having an input reel, a deflection component, a take-up reel, and a smearing tape. The smearing tape may include a plurality of perforations formed therein. The smearing tape may be wrapped around the deflection component such that each of the plurality of perforations forms a blade that extends from the smearing tape to expose a smear surface as the smearing tape is drawn into the take-up reel. A slide transport surface is also provided to move a slide across the smear surface.