| 摘要 |
<p>1. A butterfly valve of inspectable type, comprising : - a tubular body (1) whose central part (6) defines a closure chamber (7) communicating with the outside through a lateral orifice (15) forming an inspection trap ; - an annular prebody (8) with two diametrically opposite substantially radial bores (9, 10) and able to pass through said orifice (15) for engaging in said chamber (7) with the axis of said bores (9, 10) passing through said orifice (15) ; - means for removably fixing said prebody (8) in said body (1) ; - a butterfly (12) mounted for rotation in said prebody (8) by means of a shaft (11) passing through said bores ; - sealing means adapted for cooperating with said body (1) and/or with said prebody (8) and with said butterfly (12), so as to provide the upstream/downstream sealing of the valve ; and - a cap (28) mountable on said body (1) for sealingly and removably closing said orifice (15), this cap (28) including a passage in which is rotatably mounted a shaft (29) for rotating the butterfly (12), characterized in that said body (1) includes an annular internal radial face (17), in that said fixing means include a plurality of elements (22) for axially clamping a first radial side (20) of said prebody (8) against said radial face (17), and in that all the clamping elements (22) are entirely housed inside the body (1) and are accessible through said lateral orifice (15) due to an appropriate shape of said closure chamber (7).</p> |
