Functional description

The intended use of the Pressure control panel BU47AC is the expansion of a gas from a gas source and the distribution of the gas with adjustable outlet pressure.

The pressure control panels BU47AC are equipped with an over-pressure valve which does not represent a component with safety function in the context of Directive 2014/68/EU.

Pressure reduction is performed by the pressure regulator. It is equipped with one pressure gauge to display the inlet pressure and the outlet pressure. The outlet pressure is set to the desired value by turning the of the adjusting screw on the pressure regulator and is not permitted to exceed a defined maximum value given on the label.

In the case of the single-stage pressure regulation present here, the set outlet pressure does not remain completely constant and instead rises slightly as the inlet pressure decreases (e.g. caused by a draining cylinder).

Especially in the case of acetylene, this increase in the outlet pressure is taken into account by the manufacturer in the limitation setting of the maximum possible pressure setting value, so that the outlet pressure cannot exceed the maximum permissible 1.5 bar for the low-pressure range in the event of no actual acetylene inlet pressure occurring.

For the safe execution of the main task, the Pressure control panel is equipped with other components in addition to the pressure regulator. The quick-action valve is located upstream of the pressure regulator in terms of flow.

The automatic quick-acting device SSE closes when acetylene decomposition occurs and thus prevents its propagation into the Pressure control panel and into the line network. After being triggered, the SSE must be replaced.

Downstream of the pressure regulator, a flashback arrestor and an optional ball valve are installed to shut off the outlet of the Pressure control panel and disconnect it from the line network.

The flashback arrestor protects the Pressure control panel against problems arising out of the line network, such as backflowing gas, flame setbacks, flame breakdown, acetylene decomposition or other inadmissible heat input.