diff --git a/api/s4_tanks.py b/api/s4_tanks.py
index d7cdff7..68b4364 100644
--- a/api/s4_tanks.py
+++ b/api/s4_tanks.py
@@ -3,8 +3,8 @@ from .s0_base import *
 from .s24_coordinates import *
 
 
-OVERFLOW_YES = 'yes'
-OVERFLOW_NO = 'no'
+OVERFLOW_YES = 'YES'
+OVERFLOW_NO = 'NO'
 
 
 def get_tank_schema(name: str) -> dict[str, dict[str, Any]]:
diff --git a/api/s5_pipes.py b/api/s5_pipes.py
index d8f1e3e..3b90d89 100644
--- a/api/s5_pipes.py
+++ b/api/s5_pipes.py
@@ -2,9 +2,9 @@ from .operation import *
 from .s0_base import *
 
 
-PIPE_STATUS_OPEN = 'open'
-PIPE_STATUS_CLOSED = 'closed'
-PIPE_STATUS_CV = 'cv'
+PIPE_STATUS_OPEN = 'OPEN'
+PIPE_STATUS_CLOSED = 'CLOSED'
+PIPE_STATUS_CV = 'CV'
 
 
 def get_pipe_schema(name: str) -> dict[str, dict[str, Any]]:
diff --git a/api/s7_valves.py b/api/s7_valves.py
index d3f95b2..e7f1df9 100644
--- a/api/s7_valves.py
+++ b/api/s7_valves.py
@@ -2,12 +2,12 @@ from .operation import *
 from .s0_base import *
 
 
-VALVES_TYPE_PRV = 'prv'
-VALVES_TYPE_PSV = 'psv'
-VALVES_TYPE_PBV = 'pbv'
-VALVES_TYPE_FCV = 'fcv'
-VALVES_TYPE_TCV = 'tcv'
-VALVES_TYPE_GPV = 'gpv'
+VALVES_TYPE_PRV = 'PRV'
+VALVES_TYPE_PSV = 'PSV'
+VALVES_TYPE_PBV = 'PBV'
+VALVES_TYPE_FCV = 'FCV'
+VALVES_TYPE_TCV = 'TCV'
+VALVES_TYPE_GPV = 'GPV'
 
 
 def get_valve_schema(name: str) -> dict[str, dict[str, Any]]: