| 摘要 |
<p>An elongated tubular wand (20) including an inlet end portion (24) and an outlet end portion equipped with a spray discharge nozzle (22). A mounting sleeve (26) is loosely disposed over the wand outlet end portion with the latter being slidingly reciprocal relative to the former. Seal structure (28) is provided establishing a fluid tight sliding seal between the external surfaces of the wand (20) and the internal surfaces of the mounting sleeve (26). A tubular full opening and closing valve (50) is sealingly mounting on the end of the mounting sleeve (26) corresponding to the wand outlet end portion and through which the latter may be lengthwise extended and retracted. The valve (50) includes structure for support from a tubular inlet fitting (16) opening into a closed pipe section or other closed vessel (10) and the inlet end portion of the wand (20) includes fluid inlet structure (36) for sealed communication with a source of fluid under pressure.</p> |
