| 摘要 |
PURPOSE:To prevent any contaminant from mixing into transferred liquid by connecting both ends of a hollow pipe which reciprocatively slides through three valve boxes containing chambers each having a discharge pipe passage communicated with the outside area at respective sides of the chambers. CONSTITUTION:Three valve boxes A-C contain chambers A1-C1 which have discharge pipe passages A2-C2 communicated with the outside areas at one sides of the valve boxes, respectively. Both ends of a sliding hollow pipe 1 which reciprocatively slides through the chambers are connected to each of supply pipe passages. One-end pipe part 1b and the other-side part 1c of the sliding hollow pipe 1 are placed in such positions that the parts 1b and 1c can be opened to both the chambers A1 and B1 and to both the chambers A1 and C1, respectively, within the distance of the reciprocating action of the sliding hollow pipe 1. |
