A device that prevents product from being spilled when loading arms or hoses are disconnected following a filling operation–as when filling a transport vehicle or large airplane, for example.
The device consists of two parts, a coupler and an adapter. The coupler is typically connected to the end of a hose or loading arm assembly. The mated adapter is permanently attached to a tank vehicle loading or delivery port.
After the coupler is connected to the adapter, the operator moves a handle on the outside of the coupler to allow product to flow. Operation of the handle opens a valve inside the coupler. When the filling procedure has ended, the operator again moves the coupler handle, closing the internal valve before disconnecting the coupler.
Drybreak devices are designed with features that prevent the operator from disconnecting the assembly before he has closed the internal valve.