| 摘要 |
PROBLEM TO BE SOLVED: To improve filling accuracy, and to prevent a splash from being generated and a surrounding area from being contaminated. SOLUTION: The hollow part 3 of a nozzle external cylindrical part 2 is formed by connecting a large diameter cylinder 9 and a small diameter nozzle 10 with a tapered cylinder 11. At the distal end of the small diameter nozzle 10 having a cylinder 10a, a tapered surface-like valve seat 10b which tilts inward is formed. A valve disc 8 is provided at the distal end of a valve rod 4 which advances/retracts in two steps in the hollow part 3 by an air cylinder. The valve disc 8 has a cylinder 8a and a tapered surface-like seating part 8b on the distal end of the cylinder 8a, and the seating part 8b seats on the valve seat 10b and closes the valve. The valve disc 8 takes a main filling position and an adjusting filling position when the valve is opened. Under an adjusting filling state, the cylinder 8a as thick as the outer diameter D1 of the valve disc 8 is located in the cylinder 10a which serves as the inner diameter D2 of the small diameter nozzle part 10, forms a gap S=(D2-D1)/2, and is set in a range of an area ratio of D2<SP>2</SP>/D1<SP>2</SP>=1.005 to 1.150. COPYRIGHT: (C)2004,JPO
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