Disclosed herein is a check valve. The check valve installed in a bore of a modulator block having an inlet path and an outlet path and configured to control oil to flow in one direction, the check valve comprising: a valve housing installed in the bore, including an inlet and an outlet configured to respectively communicate with the inlet path and the outlet path, and having an open upper portion; a cap member configured to seal the open upper portion of the valve housing and fixed to the modulator block; a plunger provided to move forward or backward in the valve housing and configured to open or close an internal path between the inlet and the outlet; and a spring provided between the cap member and the plunger and configured to press the plunger to close the internal path.

An automated smear making apparatus used to prepare and smear samples on glass slides. In one embodiment, there is provided a smearing subsystem that generally includes a smear cartridge having: an input reel; at least one roll bar; a take-up reel; and a smearing tape. The smearing tape is initially wound within the input reel and coupled to the take-up reel such that the smearing tape can be drawn from the input reel and into the take-up reel. The smearing tape may include a plurality of perforations formed therein. The smearing tape may then be wrapped around the roll bar 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. Alternatively, the smearing tape may be bent such that an edge of the smearing tape forms a smear surface between two roll bars. A slide transport surface is also provided to move a slide across the smear surface.

An electromagnetically actuated valve includes at least one sleeve, a magnet core arranged in a fixed manner in the at least one sleeve, a magnet armature configured to actuate a valve element and arranged so as to be axially movable, and an elastically deformable flat spring element held in a clampable manner between a core end face of the magnet core facing the magnet armature and an armature end face of the magnet armature facing the magnet core. The spring element is configured to form at least one contact point with the armature end face and the core end face. The core end face defines a stepped configuration in a radial extent having at least two successive steps.

An electromagnetically actuated valve includes at least one sleeve, a magnet core arranged in a fixed manner in the at least one sleeve, a magnet armature configured to actuate a valve element and arranged so as to be axially movable, and an elastically deformable flat spring element held in a clampable manner between a core end face of the magnet core facing the magnet armature and an armature end face of the magnet armature facing the magnet core. The spring element is configured to form at least one contact point with the armature end face and the core end face. The core end face defines a stepped configuration in a radial extent having at least two successive steps.

To extend a power cylinder bore in a hydraulic block of a power brake system, a cylinder cover, which is in the form of a cylinder tube and is closed at one end, is fastened by means of a circumferential caulking in a fastening groove of the hydraulic block which encloses the power cylinder bore. An interference fit of a fastening flange of the cylinder cover in the fastening groove reliably seals the cylinder cover against the hydraulic block in a pressure-proof manner.

A non-return valve having a valve opening spring is positioned between an unpressurized brake fluid reservoir and a brake master cylinder of a hydraulic vehicle power brake system having an externally-powered brake pressure generator. The non-return valve allows for a flow-through in the direction of the brake master cylinder and blocking against a return flow from the brake master cylinder into the brake fluid reservoir starting at a counterpressure in the brake master cylinder specified by the valve opening spring.

A non-return valve having a valve opening spring is positioned between an unpressurized brake fluid reservoir and a brake master cylinder of a hydraulic vehicle power brake system having an externally-powered brake pressure generator. The non-return valve allows for a flow-through in the direction of the brake master cylinder and blocking against a return flow from the brake master cylinder into the brake fluid reservoir starting at a counterpressure in the brake master cylinder specified by the valve opening spring.

A method for flowing sand out of a trailer, includes charging a brake air tank of the trailer. The method further includes charging an air compression tank with air from the brake air tank. Additionally, the method includes opening a gate of a hopper attached to the trailer, so sand flows out an opening formed by the gate. Moreover, the method includes activating a first air nozzle on the hopper to emit a burst of air from the air compression tank after a first set time period to assist moving the sand. Also, the method includes activating a second air nozzle on the hopper to emit a burst of air from the air compression tank after a second set time period to assist moving the sand. Further, the method includes repeatedly reactivating the first air nozzle and the second air nozzle until the air compression tank is empty.

A method for flowing sand out of a trailer, includes charging a brake air tank of the trailer. The method further includes charging an air compression tank with air from the brake air tank. Additionally, the method includes opening a gate of a hopper attached to the trailer, so sand flows out an opening formed by the gate. Moreover, the method includes activating a first air nozzle on the hopper to emit a burst of air from the air compression tank after a first set time period to assist moving the sand. Also, the method includes activating a second air nozzle on the hopper to emit a burst of air from the air compression tank after a second set time period to assist moving the sand. Further, the method includes repeatedly reactivating the first air nozzle and the second air nozzle until the air compression tank is empty.