| 摘要 |
<p>There is provided a valve including a bonnet (10) adapted to be screwed into a tap body (not shown) and tightened to seal the inlet end of the bonnet (10) to the tap body. The outlet from the bonnet (10) to the tap body outlet casting is provided by six apertures (18). A spindle (22) engages the bonnet (10) by spindle engagement threads (15) and (23), and O-ring seal (24). A tap washer assembly (25) is engages the end of the spindle (22). A threaded counter bore (19) in the inlet end of the bonnet (10) receives a removable annular seat (26) having a spigot extension (29). The inner face (33) of the seat (26) forms a sealing face for the washer assembly (25). The outer face (31) of the seat (26) forms, with washer (27), the seal of the inlet end of the bonnet to the tap body. The seat (26) is one of a set having bores (34) of 2, 3, 4 and 6mm respectively. The lead in portions (30) taper in to the bore (34) to provide hydrodynamic quietening, and is confined to the spigot portion (29) to avoid reduction in section of the seat. The apparatus has the advantages of having selective chokes to limit maximum flow rate for a given supply pressure and reduced tap body seat wear.</p> |
