| 摘要 |
PROBLEM TO BE SOLVED: To prevent abrasion damage caused by discharge by dividing a taper surface into a valve main body seat surface with which a valve element can be brought into contact with and a valve main body taper surface on the upstream side, and arranging the upstream end of the valve main body seat surface through a process of deviating it downstream from the downstream end of the valve main body taper surface. SOLUTION: A valve body seat member 24 made of abrasion resistant, corrosion resistant and anti-corrosive members is arranged downstream from a valve element main body part 14c by a stud bolt and a nut through an O-ring 26 so as to be attached and detached, and only the valve element seat member 24 can be changed in abrasion damage of a seat surface 24a. A valve main body 20 is formed by assembling a valve main body seat part 20b to the valve main body part 20a by a bolt and a nut through the O-ring 22 so as to be attached and detached. The upstream end of the valve main body seat surface 20c is deviated from the downstream side end of the valve main body taper surface 20d only by the distance (d), the inclinationθS of the valve main body seat surface 20c is made smaller than the inclinationθB of the valve main body taper surface 20d, and the valve main body seat surface 20c is prevented from receiving abrasion damage to be caused by discharging flow.
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