Locking Device for Diaphragm Valves To prevent unauthorized operation, the valve handwheel can be padlocked in the open or closed position. Resources Data SheetData sheet – Locking Device for Diaphragm ValvesIdeal Applications Include: Chemical Processing, Water & Wastewater, Landfills, Irrigation, Food Processing, Mining Resources Online Tools Resources Datasheet – Locking Device for Diaphragm ValvesDrawing – Locking Device for Diaphragm Valves Online Tools Part number search toolChemical resistanceLocate your nearest distributor