Absperrorgan

摘要

1,067,419. Valves. GROVE VALVE & REGULATOR CO. June 10, 1965 [June 10, 1964], No. 24658/65. Heading F2V. A rotary spherical closure 74 is housed within a casing comprising a tubular shell 12 welded to a mounting block 14 which is clamped by studs 50 and bolts 52 between end plates 22, 24 to which are welded tubular hubs 26, 27 for attachment in a pipeline. The closure 74 is supported at trunnions 78, 79, formed within the radius of the closure 74, by bearing plates 80, 82 which are provided with rotary and thrust bearing members 84, 88 and which are removably located to the end plates 22, 24 by pins 56; tight clamping between the plates 22, 24 being facilitated by a slight clearance between the shell 12 and end plates 22, 24 which is sealed by ring 20. An operating shaft 16, insertable through block 14, is fixed to trunnion 78 by pins 90 and is sealed by a gland plate 92, provided with seal rings 102, 104 having a leakage detecting passage 115, which is bolted to block 14 and is surmounted by an adaptor plate 110, for a valve operator, secured to block 14 by screws 112 and into which is partially recessed a retainer ring 106 for the upper seal 104. A fixed pin 77 on the closure 74 co-operates with bearing plate 80 to limit and indicate the open and closed position of the closure which seats on seat ring assemblies 28 (Fig. 10, not shown), comprising members (150), (152) interlocked by a snap-fit split ring (160) secured by a pin 166 and resiliently mounted by a plurality of springs 42. The closure cavity may be drained from outlets (117), (118) (Fig. 2 not shown). In an alternative embodiment (Fig. 7, not shown), the body shell (122) comprises a complete ring or pipe to the ends of which are welded flange rings (124) for bolting to the end plates (130), (132) and to which is welded a mounting block (126) through which the operating shaft 16 passes and which is surmounted by a similar gland plate and adaptor plate. Connection to a pipeline of larger size is facilitated (Fig. 7, not shown), by flaring the hubs (142) or welding therein a frusto-conical liner (144) which is vented to the pipeline. In a further embodiment (Figs. 11 and 12, not shown) a valve shaft extension (178) is engaged over flats (172) on the operating shaft (16) within a recessed adaptor block 170 wherein a pair of stop-pins (190) co-operate with arcuate recesses (192) and stop surfaces (194) on either side of a shaft coupling (176).