| 摘要 |
The present invention provides an improved knifegate valve (1), comprising a body (3), a knifegate (2), a gland box (4), an actuator (9, 10, 11) for inserting the knifegate (2) through the gland box (4) into the valve body (3) and retracting it therefrom, a support (5, 6) for supporting the actuator (9, 10, 11) in spaced relation to the gland box (4) and the body (3) and a securing device (20) for securing the gland box (4) in such a way that it is capable of retaining packing material (17) contained therein in a compressed state, wherein the improvement comprises connecting the securing device (6) to the support (5). The support may comprise a bridge (5) supported in spaced relation to the body (3) by pillars (6) connected to the body (3), in which case the securing device may comprise nuts (20) that are capable of cooperating with corresponding external threads on the pillars (6) to secure the gland box lid (14) to its base (13). The actuator may comprise a hand wheel (9) having a central threaded bore (10) and a corresponding spindle (11) connected to the knifegate (2). The knifegate (2) may also be pneumatically actuated or actuated by a solenoid. Alternatively the knifegate may be connected to a piston that is lever operated. |
