| 摘要 |
<p>A fluid control and/or metering assembly (5, 10) is accommodated in a composite housing sunk into the ground. Access to the assembly is through a lid (2) which fits the upper end of an adjustable sleeve (40) telescoped over a rim (37) at the top of an upper housing (1). By fitting selected spacers (48) within, between the rim and a shoulder formation (42) on the sleeve, the lid can be made substantially flush with the ground. The upper housing seats in a lower housing (21) fitted around pipes (33, 34), which are laid horizontally and turn upwards at elbows within the lower housing for their ends to have a sliding entry into the assembly. This lower housing ensures the necessary vertical alignment, while allowing for limited relative movement between the pipes and the housing both vertically and skewing about a vertical axis. Free space within the housing is packed with insulation (36, 47, 48).</p> |
