Index: dialin/hd/valves.py
===================================================================
diff -u -r597b213629a8243dd0d76ee5fe16f7b83e64483f -rd33a3e715c614058e916cb3eb2647dc4c9edc607
--- dialin/hd/valves.py	(.../valves.py)	(revision 597b213629a8243dd0d76ee5fe16f7b83e64483f)
+++ dialin/hd/valves.py	(.../valves.py)	(revision d33a3e715c614058e916cb3eb2647dc4c9edc607)
@@ -340,7 +340,7 @@
         @returns 1 if successful, zero otherwise
         """
 
-        if valve_state == AirTrapState.STATE_OPEN:
+        if valve_state == AirTrapState.STATE_OPEN.value:
             payload = integer_to_bytearray(1)
         else:
             payload = integer_to_bytearray(0)