| 摘要 |
<p>1469426 Valves LUNKENHEIMER CO 22 Nov 1974 [28 Jan 1974] 50738/74 Heading F2V In a butterfly valve a casing member 40 of relatively weak cast metal is slidably mounted on a strong sleeve 10 so that diametrically opposed apertures in both are aligned. The valve disc 16 is rotatable on a first stem 58 which is screwed into a bore 44 of the casing member and reacts through a shoulder 60 with a shoulder 62 of the sleeve to lock the casing member to the sleeve. A second valve stem 20 extends through the casing member and is rotatably coupled by flats and a complementary bore with the disc for rotation of the latter by a handle 82. Detents on a fixed disc 73 and apertures in a flexible disc 75 rotatable with the stem 20 co-operate to hold the disc in open, closed and intermediate positions. The handle is also connected to the disc 75 by pins (86) projecting into apertures in the disc. The sleeve has a corrosion resistant liner 39 which is formed with thickened portions to sealingly co-operate with the flattened end portions of the disc. The disc is free to float axially of the stems. In a first modification the stem 20 extends through a bore in the disc and is rotatably supported in a plug screwed into the casing bore 44. In a further modification the stem 20 has a shoulder which is prevented from blow out by co-operation with a shoulder in an enlarged diameter bore 46.</p> |
