The pneumatically controlled filling head SAS is an independent unit designed for operation with a filling machine or an evacuation unit. The SAS is semi-automatic and is used for safe and accurate filling/evacuation of LPG cylinders with screw valves. It is mounted on the machine (e.g. a UFM filling machine) with a retractable spring balancer.
The filling head connection is performed in two steps after it is manually pulled down and connected onto the cylinder valve. When the operator activates the filling process, a pair of clamping jaws lock the filling head with the cylinder valve, and an internal filling nozzle is connected with the cylinder valve creating an air-tight seal. Then, the built-in gas stop valve opens the LPG flow inside the filling head. Filling starts when the cylinder valve is opened by turning the hand wheel on the cylinder valve. This can be done manually or automatically with a valve opener/closer.
The filling head disconnection is performed in two steps. First, the built-in gas stop valve closes to cut off the LPG flow. Then, the nozzle is retracted away from the cylinder valve, and the clamping jaws are automatically unclamped from the cylinder valve. Finally, the filling head retracts back under the spring force of the retractable spring balancer.