A safety opening/closing valve for easy checking of an opened/closed state thereof, the valve comprising:
- a ball valve part comprising:
- a body part having a flow path formed therein, and a rotating shaft part exposed to an upper side of the body part at a portion thereof and configured to open and close the flow path by rotating;
- a housing part being opened at central areas of upper and lower surfaces thereof and configured in a shape of a cylinder having an inner space, the housing part having a plurality of gear teeth formed vertically along an inner circumference of the inner space of the housing part and having a fixing part formed at a lower portion of the housing part such that the fixing part is fixed to an upper portion of the body part;
- a rotating part comprising:
- a disk-shaped plate part arranged in the housing part such that the plate part rotates relative to a central axis of the housing part, at least three protrusions formed on an upper surface of the plate part by protruding vertically upward therefrom such that the at least three protrusions are arranged at same intervals along a circumferential direction of the plate part by being spaced apart by predetermined distances from a center of the plate part, and an insertion part having an insertion groove formed at a lower surface of the plate part, the upward exposed portion of the rotating shaft part being inserted and fixed to the insertion groove of the insertion part;
- a driving part comprising:
- a sun gear part configured to have a rod shape and inserted through an open central area of a top surface of the housing part, the sun gear part having a plurality of gear teeth formed along a circumference of a lower portion of the sun gear part located in the housing part, and a coupling part coupled with a rotating means configured to supply a rotational force thereto, the rotating means being coupled to an upper portion of the coupling part directed toward an upper outside of the housing part, wherein the coupling part is exposed outside of the housing part upon the sun gear part being inserted into the housing part;
- at least three satellite gear parts fitted over the protrusions, respectively, each of the three satellite gear parts having gear teeth engaging with the gear teeth formed at the inner circumference of the housing part and the gear teeth of the sun gear part, wherein when the driving part is rotated by the rotational force supplied from the rotating means, the satellite gear parts rotate along the inner circumference of the housing part, with the gear teeth of the satellite gear parts engaging with the plurality of gear teeth formed at the inner circumference of the housing part, and transmit the rotational force to the protrusions so as to rotate the rotating part;
- and
- a bar-shaped display part coupled to an upper portion of at least one of the at least three protrusions and configured to move while drawing an arc according to the rotation of the rotating part,
- wherein an arc-shaped transparent part made of a transparent material is provided at an area of an upper surface of the housing part corresponding to a trajectory of the movement of the display part,
- wherein, in the driving part and the housing part,
- a diameter of the sun gear part is smaller than a diameter of the open central area of the top surface of the housing part,
- a diameter of an area between the coupling part and the sun gear part is larger than the diameter of the open central area of the top surface of the housing part,
- the area between the coupling part and the sun gear part is located to cover the open central area of the top surface of the housing part upon the sun gear part being inserted into the housing part,
- a sealing member is coupled to a lower circumference of the area and has a diameter larger than the diameter of the open central area of the top surface of the housing part,
- a groove corresponding to a shape of the sealing member is formed at a side surface of the open central area of the top surface of the housing part, and
- the sealing member is held in the groove formed at the side surface of the open central area of the top surface of the housing part upon the sun gear part being inserted into the housing part.