Fast emptying in front of the direction for high-pressure oil of a steam turbines inlet valve in the case of overspeed

摘要

The device comprises a speed trip (2) integral with the shaft (1) of the turbine and, downstream of a slot (5), in the low pressure oil circuit by the lubricating oil of the turbine, characterized in that it comprises a valve (9) comprising a body containing a valve closure member of a discharge orifice (12) connected to the high pressure oil circuit, the valve closure member being connected to a plate between the inside of the body of the valve (9), a sealed manner into two compartments, one (11) is located on the side of the discharge orifice (12) and comprising a discharge orifice (37), and the other, called the second compartment (8) is supplied, downstream of a slot (5), by a feed orifice (7), in the oil of the low pressure circuit, the second compartment (8) is also connected to the speed trip (2), and in that the mobile (10) constituted by the valve closure member and the plate is axially guided by guide means, the mobile is also subjected to an elastic force in the direction of the release of the valve (4) of the discharge orifice (12).