| 摘要 |
<p>A tapered plug valve having a spring means to urge the plug (4) towards its bore (3) in the valve body (1) and adjustment means (22; 85; 111; 146; 178) to locate one of the plug (4) and the spring means (26; 87; 106; 145; 166) in relative predetermined positions. The spring means may comprise a flat spring (26, 87) located within the valve body (1), a disc spring (145) in a bore in the drive shaft (12; 133) or a beam (106; 166) on the cover (9) of the valve body (1). The adjustment means may comprise a collar (22; 85; 111; 178) or a screw (146), movably secured to the shaft (12; 133), the plug (4) or the spring means (26; 87; 106; 145; 166).</p> |
