| 摘要 |
PROBLEM TO BE SOLVED: To enable the upper part of a suction pipe to be positively engaged with the inner face of a suction pipe engaging cylinder hanging perpendicularly from the lower end of a cylinder, and the lower bent part of the suction pipe to easily and securely coincide with the direction of a nozzle by circumferentially forming a recessed groove on the inner face of the suction pipe engaging cylinder. SOLUTION: This suction pipe engaging cylinder 1 is engaged with the interior of a perpendicular cylinder whose upper part penetrates through the top wall rear part of an inner plug and communicates with a cylinder. In addition, a single piece or plural pieces of protrusion strips 11, 11 are provided lengthwise on the inner face of the suction pipe engaging cylinder 1 below an inwardly faced flange-shaped suction valve seat 14 installed on the upper inner face of the suction pipe engaging cylinder 1, leaving some distance from the valve seat 14. Further, a single piece or plural pieces of recessed grooves 12a, 12b, 12c, 12d are circumferentially provided, and lower lateral recessed grooves 12b, 12c, 12d are tapered from top to bottom in inner diameter. Besides, the upper lateral recessed groove 12a is of the same diameter from top to bottom. Thus the suction pipe 4 is prevented from being removed or rotated due to the protrusion strips 11, 11 and the recessed grooves 12a, 12b, 12c, 12d. |
