| 摘要 |
<p>1,016,401. Valves. GROVE VALVE & REGULATOR CO. June 6, 1963 [June 7, 1962], No. 22646/63. Heading F2V. In a gate valve having a unitary, e.g. cast, body construction, the gate member is coupled to an actuator and movable between end walls containing fluid passages smaller than the gate; one passage being formed directly within one end wall and the other by an annular insert into an opening in the other end wall through which the gate can be inserted into position between the walls. Circular gate member 40 is inserted through opening 22 into position between end walls 14 and 15 of cast valve body 12 and acts in sealing engagement between spring-seated seat rings 50 and 51, operatively retained in position by annular insert 26 fixed to the body by bolts 29 circumferentially spaced alternately with tapped openings (not shown) for fixing to a pipe line. During assembly, the gate member 40 is raised through the opening between the walls 14 and 15 and joined by a coupling pin 45 to a coupling element 43 to which is attached an operating stem 42 carrying a seal block 46 which is subsequently seated within the opening between the walls. In a further embodiment, the circular gate member 70 is inserted in a similar manner and operated by a crank 88 rotated upon an offset shaft 80 which is journalled within a bearing 81 threadedly removable from the casing 62 to permit insertion of the crank-pin 90 into the arm 92 of the member 70 during assembly A guide-pin 94 is screwed into the arm 92 of member 70 through a normally closed valve body opening 99 to keep the arm 92 centred and engaged with the pin 90 and a valve body stop 96 limits movement of the arm 92 to stop at the closed position. Alternatively (Fig. 13) the crank-pin 90a may be retained in position by a plate 106 acting as bearing surface for a washer 109 screwed into the pin 90a, or the retaining plate 106 may be replaced by an internal flange on the arm 92a extending across the crank-pin opening. The spindle 80 is fitted with an indicating pointer 85.</p> |
