Gas line flow monitor fitment comprises cock with rotary ball carried on ring seals and accessible by inlet passage so ball skews between seated end setting for flow reversal.

摘要

The shutoff fitment includes an externally accessible closable inlet (5) into the connecting line (4) and a pressure-actuated shutoff valve in the inlet which opens when the outside pressure exceeds that in the line (4). The cock (1) includes a bored (10) ball (11) rotated via shaft (6) whose own passage (5) acts as inlet communicating via a first orifice with the ambient atmosphere and with a second orifice with the connecting line (4). The ball (11) is carried between two sealing rings (9,13) and seals onto these in open and closed settings. In intermediate skewed-ball settings, so pressure build-ups in line (3) re-instate the underground monitor.