diff --git a/NON-APPROVED/COMMON/DEVICES/vacuum/COMMON/pressure.py b/NON-APPROVED/COMMON/DEVICES/vacuum/COMMON/pressure.py
index daf29b6277f59c31bbab8fb9d9c622b9be4240a1..822c38b622e02a3d65ebf6e8d0fed9273c9075d3 100644
--- a/NON-APPROVED/COMMON/DEVICES/vacuum/COMMON/pressure.py
+++ b/NON-APPROVED/COMMON/DEVICES/vacuum/COMMON/pressure.py
@@ -3,6 +3,12 @@ from org.csstudio.display.builder.runtime.script import ScriptUtil
 
 tooltip  = "N/A"
 
+# Compatibility with 4.6.3
+try:
+    PVUtil.PVHasNoValueException
+except:
+    setattr(PVUtil, 'PVHasNoValueException', Exception)
+
 try:
     pvStat   = PVUtil.getString(pvs[0]).upper()
     pvPrsStr = PVUtil.getString(pvs[2])
@@ -37,6 +43,8 @@ try:
             tooltip = pressure
     else:
         tooltip = pvPrsStr
+except PVUtil.PVHasNoValueException:
+    pass
 except Exception as e:
     ScriptUtil.getLogger().severe(str(e))
 
diff --git a/NON-APPROVED/COMMON/DEVICES/vacuum/vpi/pressure.py b/NON-APPROVED/COMMON/DEVICES/vacuum/vpi/pressure.py
index 83475c3c97b22c3a8455c0deb5978b5f623dc822..d23b4acd5d1c55a2c921d14f1c67dc6912c814bf 100644
--- a/NON-APPROVED/COMMON/DEVICES/vacuum/vpi/pressure.py
+++ b/NON-APPROVED/COMMON/DEVICES/vacuum/vpi/pressure.py
@@ -3,6 +3,12 @@ from org.csstudio.display.builder.runtime.script import ScriptUtil
 
 tooltip  = "N/A"
 
+# Compatibility with 4.6.3
+try:
+    PVUtil.PVHasNoValueException
+except:
+    setattr(PVUtil, 'PVHasNoValueException', Exception)
+
 try:
     pvStat   = PVUtil.getString(pvs[0]).upper()
 #    pvPrsStr = PVUtil.getString(pvs[2])
@@ -39,6 +45,8 @@ try:
 #            tooltip = pressure
 #    else:
 #        tooltip = pvPrsStr
+except PVUtil.PVHasNoValueException:
+    pass
 except Exception as e:
     ScriptUtil.getLogger().severe(str(e))