Highly reliable service port
A port for use in introducing a fluid into an internal fluid chamber includes a plug bore, a valve disposed in the plug bore and a plug. The plug includes one or more seal grooves and a ring seal in each of the one or more seal grooves. The ring seal creates a seal between the plug and the plug bore. The port further includes a positive stop barrier that prevents the plug from being removed from the plug bore.
1. A port for use in transferring a fluid to and from an internal fluid chamber, the port comprising:
a plug bore, wherein the plug bore comprises:
a non-threaded upper bore; and
a lower bore with a threaded portion;
a plug configured for a non-threaded engagement with the plug bore to selectively close and seal the plug bore, wherein the plug comprises:
a head configured to be accepted within the non-threaded upper bore, wherein the head includes one or more seal grooves;
a stem extending into the lower bore above the threaded portion, wherein the stem does not include a passage that permits the fluid to pass through the stem; and
one or more ring seals, wherein each of the one or more ring seals is captured in a corresponding one of the one or more seal grooves; and
a valve assembly captured by a threaded engagement within the threaded portion of the lower bore.
2. The port of claim 1 , wherein the plug bore comprises:
a service opening; and
a stop groove adjacent the service opening.
3. The port of claim 2 further comprising a positive stop barrier retained within the stop groove.
4. The port of claim 3 , wherein the positive stop barrier is a snap ring.