Valve and method of operating boiler using the same

Abstract

Disclosed is a valve including a valve housing having an empty space therein, an opening/closing part provided in the valve housing and configured to be movable in an upward/downward direction H, a shaft part fixedly coupled to the opening/closing part and configured to be movable in the upward/downward direction H together with the opening/closing part, a drive part configured to move the shaft part in the upward/downward direction H, and a seating part protruding inward from an inner surface of the valve housing and configured to interfere with the opening/closing part when the opening/closing part moves in the upward/downward direction H by a predetermined distance.

What is claimed is: 
     
         1 . A valve comprising:
 a valve housing having an empty space therein;   an opening/closing part provided in the valve housing and configured to be movable in an upward/downward direction H;   a shaft part fixedly coupled to the opening/closing part and configured to be movable in the upward/downward direction H together with the opening/closing part;   a drive part configured to move the shaft part in the upward/downward direction H; and   a seating part protruding inward from an inner surface of the valve housing and configured to interfere with the opening/closing part when the opening/closing part moves in the upward/downward direction H by a predetermined distance,   wherein the seating part comprises:   an upper seating part provided above the opening/closing part; and   a lower seating part provided below the opening/closing part,   wherein the opening/closing part comprises:   an opening/closing part body configured to define a body of the opening/closing part;   an upper protruding disc protruding upward from an upper surface of the opening/closing part body; and   a lower protruding disc protruding downward from a lower surface of the opening/closing part body, and   wherein a width of the upper protruding disc in the upward/downward direction H and a width of the lower protruding disc in the upward/downward direction H are different from each other.   
     
     
         2 . The valve of  claim 1 , wherein an outer diameter of the upper protruding disc is smaller than an inner diameter of the upper seating part, and an outer diameter of the lower protruding disc is smaller than an inner diameter of the lower seating part. 
     
     
         3 . The valve of  claim 2 , wherein the opening/closing part body comprises:
 a central region;   an upper region having a lower end connected to an upper end of the central region, and an upper end connected to the upper protruding disc; and   a lower region having an upper end connected to a lower end of the central region, and a lower end connected to the lower protruding disc,   wherein an outer diameter of an upper surface of the upper region is larger than the inner diameter of the upper seating part, and   wherein an outer diameter of a lower surface of the lower region is larger than the inner diameter of the lower seating part.   
     
     
         4 . The valve of  claim 1 , wherein the width of the upper protruding disc in the upward/downward direction H is larger than the width of the lower protruding disc in the upward/downward direction H. 
     
     
         5 . The valve of  claim 2 , wherein i) a difference between the inner diameter of the upper seating part and the outer diameter of the upper protruding disc is more than 0 mm and equal to or less than 0.1 mm, or ii) a difference between the inner diameter of the lower seating part and the outer diameter of the lower protruding disc is more than 0 mm and equal to or less than 0.1 mm. 
     
     
         6 . The valve of  claim 3 , wherein a distance in a horizontal direction W between a radially outer peripheral surface of the upper surface of the upper region and a radially outer peripheral surface of the upper protruding disc is larger than the width of the upper protruding disc in the upward/downward direction H. 
     
     
         7 . The valve of  claim 3 , wherein assuming that a position of the opening/closing part when the upper surface of the upper region comes into contact with the upper seating part as the opening/closing part is moved in the upward/downward direction H by the drive part is a top dead center and a position of the opening/closing part when the lower surface of the lower region comes into contact with the lower seating part as the opening/closing part is moved in the upward/downward direction H by the drive part is a bottom dead center, the width of the upper protruding disc in the upward/downward direction H is 0.25 times or more and 0.50 times or less an interval in the upward/downward direction H between the top dead center and the bottom dead center. 
     
     
         8 . The valve of  claim 1 , wherein the opening/closing part body has a rotationally symmetrical shape about a central axis of the shaft part and has a symmetric shape in the upward/downward direction H. 
     
     
         9 . The valve of  claim 3 , wherein the upper region comprises:
 an upper inclined section having a lower end connected to the central region, the upper inclined section having an outer diameter increasing upward; and   an upper cylindrical section extending upward from an upper end of the upper inclined section and having a cylindrical shape, and   wherein the lower region comprises:   a lower inclined section having an upper end connected to the central region, the lower inclined section having an outer diameter increasing downward; and   a lower cylindrical section extending downward from a lower end of the lower inclined section and having a cylindrical shape.   
     
     
         10 . The valve of  claim 3 , wherein an outer diameter of the central region is smaller than the outer diameter of the upper protruding disc and the outer diameter of the lower protruding disc. 
     
     
         11 . A method of operating a boiler using the valve according to  claim 1  in which the width of the upper protruding disc in the upward/downward direction H is larger than the width of the lower protruding disc in the upward/downward direction H, the method comprising:
 a first hot water supply step of supplying hot water through a space between the lower protruding disc and the lower seating part by tightly attaching the upper protruding disc to the upper seating part; and 
 a second hot water supply step of supplying hot water through a space between the upper protruding disc and the upper seating part by tightly attaching the lower protruding disc to the lower seating part. 
 
     
     
         12 . The method of  claim 11 , wherein the hot water in the first hot water supply step is supplied to a pipe connected to a region intended to be heated, and the hot water in the second hot water supply step is supplied to a heat exchanger so as to exchange heat with water to be discharged to the outside. 
     
     
         13 . The method of  claim 11 , further comprising:
 a third hot water supply step of supplying hot water through the space between the upper protruding disc and the upper seating part and the space between the lower protruding disc and the lower seating part by spacing the upper protruding disc apart from the upper seating part and spacing the lower protruding disc apart from the lower seating part.