General Electric Company

John Howard Steenburgh

Roger Bennett Clark

Nicholas Dundas Porteous

The steam valve includes a fast-acting control valve and stop valve acting against a valve seat in a steam flow passage in a closed position. An outlet passage below the valve seat has transition walls therebetween, affording a smooth, continuous flow past the seat into an outlet whereby head losses are reduced. An annular screen about the valve has support structure recessed in the walls of the inlet to reduce flow blockage and vortex formation. A balance chamber disposed above the control valve has a bleed hole for equalizing steam pressure in the balance chamber and steam valve which inhibits depressurization of the balance chamber and facilitates fast closing of the control valve. Buttress threads interconnect the control valve stem and the control valve head to preclude binding of those parts due to oxide buildup.

Combined stop and control valve for supplying steam

A steam valve for a steam turbine includes a control valve head having a recess and a stop valve head disposed within the recess of the control valve head, both heads having sealing surfaces in opposition to a valve seat. The control valve head is displaced by a control system in accordance with steam turbine requirements. The stop valve head provides a fast-acting valve to close the steam valve in response to a turbine upset. The control system, at least during throttling operations, controls the position of the stop valve head in proportion to the position of the control valve head such that vortex flow past the surfaces and valve seat is minimized or eliminated and substantial laminar flow occurs across the sealing surfaces of the stop valve and control valve heads.

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Amsterdam, NY, United States of America

John Howard Steenburgh