Reed valve
A reed valve is a check valve on the two sides of the valve opens without other external drive, only because of pressure differences in the forward direction and closes again automatically. It consists of an elastic material, to ensure the characteristics of the same time the closing of the valve. Also, the materials must be so stiff that ensures the valve function at a pressure difference against the opening direction. Flutter valves are usually made of spring steel or of plastic.
Flutter valves are used today in membrane-controlled two-stroke engines and compressed air breathing apparatus. Even with a hydraulic ram, a flutter valve may be used. During the Second World War, a use in the pulse jet engine of V1 revealed. A current application in the field of aviation can be found in the Hawker Siddeley Harrier VTOL aircraft that uses the for control at low airspeeds flutter valves, as long as the aerodynamic control is not yet effective. The valves are located in the nose of the aircraft, in the rear and at the wing tips.
When firefighters flutter valves are used in fire -fighting centrifugal pumps. Your nature is described in DIN 14381. There they are called " globe valve ( self-closing) ." They consist of then: housing, valve spindle with hand wheel, spring- loaded valve plate gasket, ratchet and stuffing box. Functionality: With the valve closed, the spindle pushes the seal plate firmly in his seat A water flow is possible in any direction. If the spindle is turned until the pawl, the spring pushes the seal plate still in his seat A directed in the forward direction water pressure can lift the seal, and water can flow through. For " water stop " if no more water is conveyed through the valve, the seal plate closes ( both by the spring pressure as well as by the back pressure of the water). In order to drain against the regular conveying direction, the outgoing line, the catch is released and the spindle turned up to the stop. Thus, the seal plate is lifted out of his seat and the flutter valve allows flow in both directions.