A valve body for a valve has an envelope surface with a bell-shaped cross section contour in a longitudinal direction of the valve body. The envelope surface is provided with a guide region for guiding the valve body in a valve seat and is further provided with a sealing region for contacting fluid-tightly the valve seat. The sealing region adjoins in the longitudinal direction the guide region. The bell-shaped cross section contour in the longitudinal direction from the guide region to the sealing region is open at one side and increases strictly monotonously. The valve body is formed of a thermoplastic polyhalogen olefin. A crankcase ventilation device is provided that is provided with a valve provided with such a valve body.

A valve has a valve housing with a valve seat and a valve body holder with a fluid-permeable flow opening. A valve body is arranged in the valve body holder and axially displaceable between an open state and a closed state of the valve. The valve body has an envelope surface with a sealing region for fluid-tightly contacting the valve seat in the closed state. It has a base region adjoining the sealing region in longitudinal direction. A cross section contour of the envelope surface increases monotonously from the sealing region to the base region. In the open state, an axial end of the base region contacts the valve body holder. The envelope surface has a weakened region connecting sealing region and base region to each other. The weakened region has a reduced stiffness along the longitudinal direction. The valve body is formed of a thermoplastic polyhalogen olefin.

An internal combustion engine may be used to compress natural gas for vehicle fuel. The engine may contain a plurality of gas compression cylinders, at least one standard combustion cylinder to drive the compression cylinders, and a common crankshaft in a crankcase coupling the compression cylinders and the at least one standard combustion cylinder. Some combustible gas being compressed may leak past the piston rings of the compression cylinders into the engine crankcase posing a safety concern. This invention eliminates this concern by actively flushing the crankcase at a higher rate than normal.

Systems are provided for a crankcase ventilation system. In one example, a crankcase ventilation (CCV) system for an engine configured to transmit crankcase gases into a clean side air duct, the clean side air duct comprising a sensor and a crankcase ventilation spigot, wherein the crankcase ventilation spigot is configured to be disposed downstream of the sensor, the crankcase ventilation spigot having an outlet configured to direct crankcase gases emerging from the crankcase ventilation spigot away from the sensor.

A crankcase breather configured to simulate an ignition system coil is provided that comprises a substantially cylindrical canister having a hollow interior, a first aperture provided proximate a top of the canister and a second aperture provided proximate a bottom of the canister, at least one of the first and second apertures opening to the interior and configured to be connected to a breather hose, and one or more output apertures formed in the canister to release gases received through the breather hose. An exterior of the canister is shaped to resemble an ignition system coil.

Various examples are provided related to crankcase ventilation for moisture removal and explosion mitigation. In one example, a combustion engine includes a crankcase with a combustion chamber; a crankcase vent for venting crankcase gas from the crankcase; and an active crankcase ventilation system for supplying supplemental air to the crankcase. The crankcase gas can include a mixture of blowby gas from the combustion chamber and the supplemental air in a ratio that reduces or eliminates condensation of water in the crankcase gas. The combustion engine can be a hydrogen engine or other type of engine.

The internal combustion engine includes a second separator, a connection pipe, and a pressure sensor. Inside the second separator, a main chamber located in the cylinder head cover, and a first sub-chamber and a second sub-chamber located in a joint portion located outside the cylinder head cover are formed. The first sub-chamber and the second sub-chamber are partitioned by partition walls. A communication hole connecting the first sub-chamber and the second sub-chamber is formed in the partition wall. The first sub-chamber is connected to the main chamber via a throttle portion. A first connection port connected to the first sub-chamber and a second connection port connected to the second sub-chamber are formed in the joint portion. The first connection port is connected to the intake passage via a connection pipe. The second connection port is connected to the pressure sensor.

A device separates particles such as oil particles from a gas flow, from a blow-by gas of a crankcase ventilation, in an internal combustion engine. The device includes a valve seat that defines a flow passage opening and a movable valve element that can be displaced between a closed position, in which the valve element is in abutting contact with the valve seat and the abutting contact defines an axial abutting point, and at least one open position, in which the valve element is moved from the axial abutting point in an axial actuating direction, wherein at least one abutting contact surface of the valve element and/or the valve seat is contoured in such a way that a fluid passage is allowed in the closed position.

A valve has a valve housing with a valve seat and a valve body holder with a fluid-permeable flow opening. A valve body is arranged in the valve body holder and axially displaceable between an open state and a closed state of the valve. The valve body has an envelope surface with a sealing region for fluid-tightly contacting the valve seat in the closed state. It has a base region adjoining the sealing region in longitudinal direction. A cross section contour of the envelope surface increases monotonously from the sealing region to the base region. In the open state, an axial end of the base region contacts the valve body holder. The envelope surface has a weakened region connecting sealing region and base region to each other. The weakened region has a reduced stiffness along the longitudinal direction. The valve body is formed of a thermoplastic polyhalogen olefin.

A valve body for a valve has an envelope surface with a bell-shaped cross section contour in a longitudinal direction of the valve body. The envelope surface is provided with a guide region for guiding the valve body in a valve seat and is further provided with a sealing region for contacting fluid-tightly the valve seat. The sealing region adjoins in the longitudinal direction the guide region. The bell-shaped cross section contour in the longitudinal direction from the guide region to the sealing region is open at one side and increases strictly monotonously. The valve body is formed of a thermoplastic polyhalogen olefin. A crankcase ventilation device is provided that is provided with a valve provided with such a valve body.