# GPS Valves

### GPS Valve Cycles 

GPS valves are the microvalves and GC valves in the manifolds. The high-
conductance valve (HCV) and the multi-function valve (MFV) are documented
in another entry.

Valve cycles are determined by examining the message log and counting
the number of times a valve transitions from closed to opened. When
counting valve cycles for a TID, the state of the valve cycles in the
previous TID is accounted for. The exact regexes used (as of Feb 22)
are:

```
VALVE_OPENED_REGEX = r'.*valve \d opened$'
VALVE_CLOSED_REGEX = r'.*valve \d closed$'
```