A pneumatically operated gas valve includes a piston positioned in a cylinder with one closed end so that the piston may seat against a gas outlet to close the gas valve. A control reservoir may be formed in the cylinder between the piston and the closed end of the cylinder. Means for filling the control reservoir with gas to a control pressure may be provided so that the control pressure acting against the piston may close the gas valve. A release valve may be opened to allow the gas in the control reservoir to escape through an exhaust port to open the gas valve.

A valve device for fuel tank has a case having an air flow valve orifice connected to outside of the tank at an upper part and a fuel inflow part beneath this air flow valve orifice, and being divided into an upper chamber and a lower chamber by a partition formed between the air flow valve orifice and the inflow part; an upper float body being inside the upper chamber and ascending by fuel flowing into the case to be seated in the air flow valve orifice; and a lower float body being supported inside the lower chamber of the case with an upwardly projecting guide shaft being inserted to be movable vertically inside an insertion part formed on the partition, and ascending by fuel flowing into the case to close a main connect-through part between the lower chamber and the upper chamber formed on the partition. A receiving hole for receiving the guide shaft of the lower float body is provided on the upper float body.

A vent valve may include, among other things, a valve body having an inlet opening and an outlet opening forming a flow path. The inlet opening may be oriented in a first direction and the outlet opening may be oriented in a second direction. A poppet member may be provided on or about the valve body and can be configured for movement between an opened position and a closed position relative to the inlet opening. The poppet member may be movable along the valve body in a direction that is perpendicular to the first direction of the inlet opening. A float member may be attached or operatively connected to the poppet member, the float member configured to move the poppet member between the first and second positions.

A vent valve may include, among other things, a valve body having an inlet opening and an outlet opening forming a flow path. The inlet opening may be oriented in a first direction and the outlet opening may be oriented in a second direction. A poppet member may be provided on or about the valve body and can be configured for movement between an opened position and a closed position relative to the inlet opening. The poppet member may be movable along the valve body in a direction that is perpendicular to the first direction of the inlet opening. A float member may be attached or operatively connected to the poppet member, the float member configured to move the poppet member between the first and second positions.

An embodiment provides a check valve including a valve case, a positive pressure valve having a resin ring sealing member, and a resin negative pressure valve. The positive pressure valve and the negative pressure valve are disposed in the valve case. The positive pressure valve includes a first mount surface and a second mount surface disposed on an inner diameter side of the first mount surface. In the valve case, a presser cap is mounted on the positive pressure valve so as to sandwich the ring sealing member and the negative pressure valve with the first mount surface and the second mount surface of the positive pressure valve.

An embodiment provides a check valve including a valve case, a positive pressure valve having a resin ring sealing member, and a resin negative pressure valve. The positive pressure valve and the negative pressure valve are disposed in the valve case. The positive pressure valve includes a first mount surface and a second mount surface disposed on an inner diameter side of the first mount surface. In the valve case, a presser cap is mounted on the positive pressure valve so as to sandwich the ring sealing member and the negative pressure valve with the first mount surface and the second mount surface of the positive pressure valve.

A deaeration valve (1) for a hydraulic coupling, such as a hydraulic coupling for distributing torque in a vehicle, said valve (1) comprising a valve member (3) and a valve housing (2), the valve housing (2) supporting the valve member (3) for reciprocal movement between two closed end positions.

A deaeration valve (1) for a hydraulic coupling, such as a hydraulic coupling for distributing torque in a vehicle, said valve (1) comprising a valve member (3) and a valve housing (2), the valve housing (2) supporting the valve member (3) for reciprocal movement between two closed end positions.

A switching membrane for a pressure control valve has a plate-shaped flat body with a central area and a bending area surrounding the central area. The central area is provided with a closure area. For switching the switching membrane, the central area can be moved back and forth by a bending movement of the bending area in a direction transverse to an extension of the central area. At least the bending area is made of fluorocarbon rubber. A pressure control valve, especially for crankcase ventilation, is provided with a valve housing that has a housing cover and further is provided with a valve seat. A switching membrane as described above is disposed in the valve housing and switches at pressure differences of at most 500 mbar to release or shut off a flow of fluid at the valve seat.

A switching membrane for a pressure control valve has a plate-shaped flat body with a central area and a bending area surrounding the central area. The central area is provided with a closure area. For switching the switching membrane, the central area can be moved back and forth by a bending movement of the bending area in a direction transverse to an extension of the central area. At least the bending area is made of fluorocarbon rubber. A pressure control valve, especially for crankcase ventilation, is provided with a valve housing that has a housing cover and further is provided with a valve seat. A switching membrane as described above is disposed in the valve housing and switches at pressure differences of at most 500 mbar to release or shut off a flow of fluid at the valve seat.