Valve module, and steam turbine and power generation system including the same

A steam turbine comprising a turbine including a rotor equipped with a plurality of turbine blades and a turbine housing for accommodating the rotor, the turbine housing having a fluid inlet and a fluid outlet;

• and a valve module mounted to the fluid inlet of the turbine, the valve module comprising a case enclosing a flow space into which fluid is introduced;
• a control valve disposed in the flow space and configured to control an amount of the fluid flowing through the flow space;
• and a stop valve disposed in the flow space below the control valve, the stop valve including:
• a stem configured to reciprocate rectilinearly between a first position and a second position,
• a stop valve disc mounted to an upper portion of the stem and configured to pass fluid when the stem is in the first position and to block fluid flow when the stem is in the second position, the stop valve disc including a bottom side having an inner circumference and an inward lip extending from the inner circumference at an inclination angle and terminating at a distal end, and
• a sealing member surrounding the stem and configured to prevent exposure of the stem when the stop valve disc is located at the first position, the sealing member including a protruding portion extending upward and flaring outward at the inclination angle of the inward lip, the protruding portion terminating at a distal end that meets the distal end of the inward lip when the stop valve disc is located in the first position.

A power generation system comprising:

• a boiler configured to heat fluid to a high temperature;
• a supply pipe connected to the boiler and configured to transfer fluid;
• and
• a steam turbine configured to be rotated by fluid supplied thereto via the supply pipe so as to generate drive force, the steam turbine including a turbine and a valve module mounted to the turbine, wherein the valve module comprises a case enclosing a flow space into which fluid is introduced;
• a control valve disposed in the flow space and configured to control an amount of the fluid flowing through the flow space;
• and a stop valve disposed in the flow space below the control valve, the stop valve including:
• a stem configured to reciprocate rectilinearly between a first position and a second position,
• a stop valve disc mounted to an upper portion of the stem and configured to pass fluid when the stem is in the first position and to block fluid flow when the stem is in the second position, the stop valve disc including a bottom side having an inner circumference and an inward lip extending from the inner circumference at an inclination angle and terminating at a distal end, and
• a sealing member surrounding the stem and configured to prevent exposure of the stem when the stop valve disc is located at the first position, the sealing member including a protruding portion extending upward and flaring outward at the inclination angle of the inward lip, the protruding portion terminating at a distal end that meets the distal end of the inward lip when the stop valve disc is located in the first position.