This document discusses, among other things, a valve assembly for controlling an exhaust pressure of a gas combustion system. The valve assembly can include a valve housing, a flapper, and a biasing device. The valve housing can be coupleable to an exhaust pipe. The flapper can be pivotably couplable to the valve housing to pivot between a full open position and a restricted position in response to exhaust pressure. The biasing device can be couplable to the housing and extendable into the exhaust pipe to engage the flapper, where the biasing device can be configured to bias the flapper toward the restricted position and can be configured to resist movement of the flapper between the restricted position and the full open position.

This document discusses, among other things, a valve assembly for controlling an exhaust pressure of a gas combustion system. The valve assembly can include a valve housing, a flapper, and a biasing device. The valve housing can be coupleable to an exhaust pipe. The flapper can be pivotably couplable to the valve housing to pivot between a full open position and a restricted position in response to exhaust pressure. The biasing device can be couplable to the housing and extendable into the exhaust pipe to engage the flapper, where the biasing device can be configured to bias the flapper toward the restricted position and can be configured to resist movement of the flapper between the restricted position and the full open position.

A dosing valve includes at least a valve housing with a duct, a valve body being movable in order to open and close the dosing valve and a spring exerting a spring force on the valve body and thus holding the valve body in a rest position. The spring is supported on at least one calibration body. The valve body, the spring and the at least one calibration body are disposed in the duct. The at least one calibration body is fastened in the valve housing at least by using a cohesive or material connection. A method for producing the dosing valve and a motor vehicle having the dosing valve are also provided.

A rotary valve internal combustion engine has a piston connected to a crankshaft and reciprocatable in a cylinder, a combustion chamber being defined in part by the piston. The engine has a rotary valve rotatable in a valve housing fixed relative to the cylinder, the rotary valve having a valve body containing a volume defining, in part, the combustion chamber and further having a wall part thereof a port giving, during rotation of the valve, fluid communication successively to and from the combustion chamber via inlet and exhaust ports in the valve housing, wherein the rotary valve is rotatable about an axis parallel to the axis of rotation of the crankshaft, the valve being mounted in a bearing arrangement which restrains the valve from movement in the axial direction but permits movement in the radial direction.

In an auxiliary chamber gas supplying device for a gas engine including an auxiliary chamber gas supply path (5, 14, 28, and 29) through which fuel gas is supplied to an auxiliary chamber (4), the auxiliary chamber gas supply path is connected to a fuel gas supply source (24) through a solenoid valve (23), and when the solenoid valve is opened, the fuel gas, in an amount corresponding to an opened period of the solenoid valve, is supplied from the fuel gas supply source to the auxiliary chamber through the auxiliary chamber gas supply path, and the opened period of the solenoid valve is set in such a manner that a predetermined amount of fuel gas is supplied to the auxiliary chamber, and a restriction unit (30) that extends the opened period of the solenoid valve is formed in the auxiliary chamber gas supply path (5, 14, 28, and 29).