diff --git a/PHI-CL/control.lua b/PHI-CL/control.lua
index c27e3b4..e30b87f 100644
--- a/PHI-CL/control.lua
+++ b/PHI-CL/control.lua
@@ -426,7 +426,7 @@ local function handle_research_queue(combinator)
     end
 end
 
-local function handle_valve_value(combinator)
+local function handle_valve_value(entity, combinator)
     local combinator_slot = combinator.get_slot(1)
 
     if not (combinator_slot or (combinator_slot.value and combinator_slot.value.name and combinator_slot.value.name == 'signal-SA')) then
@@ -436,8 +436,24 @@ local function handle_valve_value(combinator)
 
     local combinator_slot_value = combinator_slot.get_slot(1).min or 0
 
-    if (combinator_slot_value >= 0 and combinator_slot_value < 101) then
+    if (combinator_slot_value >= -1 and combinator_slot_value < 101) then
         -- every item in front of it?
+        local v = entity.surface.find_entities_filtered{type='valve', position=entity.position, radius=1}
+
+        if not (v or #v == 0) then
+            return
+        end
+
+        for _, valve in pairs(v) do
+            if valve.valve_threshold_override then
+                if combinator_slot_value == -1 then
+                    valve.valve_threshold_override = nil
+
+                else
+                    valve.valve_threshold_override = combinator_slot_value / 100
+                end
+            end
+        end
     end
 end
 
@@ -459,7 +475,7 @@ script.on_nth_tick(10, function(_)
             if combinator and combinator.sections_count then
                 if combinator.sections_count > 0 then
                     handle_research_queue(combinator)
-                    handle_valve_value(combinator)
+                    handle_valve_value(entity, combinator)
 
                 else
                     combinator.add_section()