In the embodiment, a steam valve device has, a steam regulating valve, and an intermediate flow path connecting the main steam stop valve and the steam regulating valve. The main steam stop valve and the steam regulating valve respectively have: casings where flow paths are formed between horizontal inlet ports and outlet ports opened downward and valve seats are arranged in the flow paths; valve elements movable up and down in the casings; and valve rods for driving the valve elements. The valve rods extend upward, and they are pulled off upward in a direction to outside of the casings when opening the flow paths. The intermediate flow path changes the flow direction of main steam flowing out of the outlet port of the main steam stop valve from downward direction to horizontal direction to guide the main steam toward the outlet ports of the steam regulating valves.

A vacuum valve includes a main flow channel that connects the first port and the second port, a main valve seat that surrounds the main flow channel, a main valve disc that opens and closes the main flow channel by contacting and separating from the main valve seat, a sub-flow channel that is formed inside the main valve disc, a sub-valve seat that is formed on an outer surface of the main valve disc, a sub-valve disc that opens and closes the sub-flow channel by contacting and separating from the sub-valve seat at a position outside the main valve disc, and a rod that causes the main valve disc and the sub-valve disc to open and close. The sub-valve disc opens and closes the sub-flow channel by being operated directly by the rod, and the main valve disc opens and closes the main flow channel by being operated via the sub-valve disc by the rod.

A vacuum valve includes a main flow channel that connects the first port and the second port, a main valve seat that surrounds the main flow channel, a main valve disc that opens and closes the main flow channel by contacting and separating from the main valve seat, a sub-flow channel that is formed inside the main valve disc, a sub-valve seat that is formed on an outer surface of the main valve disc, a sub-valve disc that opens and closes the sub-flow channel by contacting and separating from the sub-valve seat at a position outside the main valve disc, and a rod that causes the main valve disc and the sub-valve disc to open and close. The sub-valve disc opens and closes the sub-flow channel by being operated directly by the rod, and the main valve disc opens and closes the main flow channel by being operated via the sub-valve disc by the rod.

A valve assembly comprises a housing, a chamber having a first product opening, a second product opening, a first closable secondary opening that can be connected to a steam line, and a second closable secondary opening. The assembly also includes a first closing element by which the first product opening can be closed, a second closing element by which the second product opening can be closed, and an outlet associated with the second secondary opening. A switching valve is arranged between the second secondary opening and the outlet such that a fluid connection between the outlet and the second secondary opening can be switched to a fluid connection between the outlet and an inlet provided on the switching valve. The inlet can be connected to a steam line, while simultaneously closing the second secondary opening. A system comprising the valve assembly and a method for operating the system are described.

Provided is a steam valve (1) equipped with: a stop valve (2) capable of stopping/releasing the flow of steam when driven so as to open/close; an governing valve (3) that is provided coaxially in the interior of the stop valve (2), and that controls the flow volume of the steam when driven to open/close in the same direction as the opening/closing of the stop valve (2); and a first guide part (11) that is provided between the stop valve (2) and the governing valve (3) so as to separate the stop valve and the governing valve in the radial direction, and that guides at least the governing valve in the opening/closing direction.

An actuator arrangement configured to be controlled by a control unit and to control a flow control arrangement includes a housing, a first valve stem configured to be connected to and control movement of a first valve member of the flow control arrangement, a second valve stem configured to be connected to and control movement of a second valve member of the flow control arrangement, a first electrical motor comprising a first rotor and a first stator, the first rotor being rotatable about the longitudinal axis, a second electrical motor comprising a second rotor and a second stator, the second rotor being rotatable about the longitudinal axis, wherein the first rotor is configured to provide a first movement of the first valve stem and the second rotor is configured to provide a first movement of the second valve stem. A method for moving the first valve stem is also disclosed.