Friedrich Uhde Gmbh

Karl-Heinz Kruger

Reinhard Altfelder

A system for holding a substantially constant pressure level in the medium pressure steam system of an integrated plant, despite any sudden shutdown of a high pressure steam turbine. A combination quick-opening and a control valve is provided with a hold-down operator and positioning actuator with a spring drive, the hold-down operator being connected through a changeover valve with a working pressure system. The positioning actuator is connected to an additional change-over valve and to the outlet of the pressure controller, such additional change-over valve being provided with a connecting line to the outlet of the pressure controller and to the outlet of a multiplier relay. The two change-over valves are actuated through the turbine trip system. The combination quick-opening and control valve has an operating lever mounted on a fixed fulcrum pivoted on the piston rod of another pneumatic drive. Alternatively, the operating lever for the combination quick-opening and control valve is pivoted centrally thereof to the valve stem and the two arms of the lever are connected respectively to the hold-down operator and the positioning actuator with their change-over valves.

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Witten, Germany

Karl-Heinz Kruger