Measurement method for steam valve and measurement device for steam valve
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsShingo Nishida, Kazuo Hirota, Fumiyuki Suzuki, Masaki Hata
Life of this patent
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Abstract
A measurement method for a steam valve according to at least one embodiment of the present disclosure, includes: a step of measuring acceleration of a valve stem when a slave valve is opened by driving the valve stem with an actuator from a fully closed state of a master valve and the slave valve; a step of detecting a timing at which the slave valve is fully opened, based on the measured acceleration of the valve stem; and a step of calculating an amount of movement of the valve stem from a reference position to a position where the slave valve is fully opened.
Claims10
A measurement method for a steam valve including:
- a valve body that includes a steam flow path through which steam flows, and a valve seat disposed in the middle of the steam flow path and having an opening portion;
- a stop valve that includes a valve stem which extends in an axial direction where an axis extends and is movable back and forth in the axial direction, a slave valve disposed at a distal end of the valve stem in a distal end portion of the valve stem, and a master valve which includes a penetrating portion where a part, of the distal end portion of the valve stem, located closer to a proximal end side of the valve stem than the distal end is inserted, closes the steam flow path by being brought into contact with the valve seat, and is formed with a through hole where steam flows in when the slave valve is opened;
- and
- an actuator for driving the valve stem,
- the measurement method for the steam valve, comprising:
- a step of measuring acceleration of the valve stem when the slave valve is opened by driving the valve stem with the actuator from a fully closed state of the master valve and the slave valve;
- a step of detecting a timing at which the slave valve is fully opened, based on the measured acceleration of the valve stem;
- and
- a step of calculating an amount of movement of the valve stem from a reference position to a position where the slave valve is fully opened.
A measurement device for a steam valve including:
- a valve body that includes a steam flow path through which steam flows, and a valve seat disposed in the middle of the steam flow path and having an opening portion;
- a stop valve that includes a valve stem which extends in an axial direction where an axis extends and is movable back and forth in the axial direction, a slave valve disposed at a distal end of the valve stem in a distal end portion of the valve stem, and a master valve which includes a penetrating portion where a part, of the distal end portion of the valve stem, located closer to a proximal end side of the valve stem than the distal end is inserted, closes the steam flow path by being brought into contact with the valve seat, and is formed with a through hole where steam flows in when the slave valve is opened;
- and
- an actuator for driving the valve stem,
- the measurement device for the steam valve, comprising:
- an acceleration sensor for measuring acceleration of the valve stem;
- a first detection unit for detecting a timing at which the slave valve is fully opened, based on the acceleration of the valve stem measured by the acceleration sensor;
- and
- a calculation unit for calculating an amount of movement of the valve stem from a reference position to a position where the slave valve is fully opened.
Dependencies are inferred from the claim text.