| 摘要 |
An auto-fill sub (10) for reliably and conveniently controlling fluid flow through a sidewall of a tubular string. The auto-fill sub (10) comprises a generally tubular housing (16) having at least one opening (26) formed through a sidewall (28) thereof, and a check valve. The check valve permits fluid flow through the or each opening (26) in a first direction and prevents fluid flow through the or each opening (26) in a second direction. The check valve includes a generally tubular flexible member (30). <IMAGE> |
