| 摘要 |
<p>A ball valve assembly and method of construction. The valve includes a one-piece ball (13) and shaft (14) in a valve housing (18) formed of a body portion (19) and an end portion (20), the body portion (19) being cast. The body portion (19) has a flow port (24) at a first end (19') thereof and a large opening (22) at a second end (19") thereof, and an elongated passageway (P) is formed in the body portion for receipt of the shaft (14). A relatively thick wall (28) portion is disposed toward the body first end (19') and a relatively thin wall portion (29) toward the body second end (19") around the passageway (P). The passageway (P) can be smooth bore or threaded throughout its length. A scallop (40) may be formed in the relatively thin wall portion (29) extending substantially perpendicular to the direction (D) of elongation of the passageway (P), the scallop (40) being machined or being formed during casting. The shaft (14) is inserted through the body portion large opening (22) and through the scallop (40) to and through the passageway (P), and then the ball (13) is moved so that it is in sealing relationship with sealing means (35) associated with the body portion. The end portion (20) is connected to the body portion (19), and a bushing (37) is affixed in operative association with the passageway threads or bore for supporting and sealing the shaft (14). The interfaces between the body portion (19) and the end portion (20), and between the bushing (37) and the body portion (19) may be welded where a poisonous fluid or the like is to be valved by the assembly.</p> |
