Functional description

The intended use of the Pressure control panel BT2000AC is the expansion of a gas from a gas source and the distribution of the gas with adjustable outlet pressure.

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 handwheel 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 control panel present here, the set outlet pressure does not remain completely constant as the inlet pressure changes, 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. This can be an acetylene safety device ASG, an automatic quick-acting valve SSE or a manual quick-acting valve KH (ball valve).

The ASG safeguards both the high-pressure section and the low-pressure section of the acetylene supply system against the exceeding of predefined response pressures. It prevents acetylene from escaping.
The ASG is a component with safety function and can completely replace a safety valve or an over-pressure valve.
The ASG is equipped with an automatic shut-off valve controlled by the inlet pressure and the outlet pressure sides. This valve closes if one of the predefined response pressures is exceeded, thus interrupting the gas supply in the high-pressure area. A display element indicates when the shut-off valve is closed. The valve remains closed even if the pressures within the gas supply system fall below the response pressures of the ASG again. The shut-off valve can only be opened and the ASG enabled via a manually operated bleed screw. The gas supply system can then be operated in normal mode again.

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.

The manual quick-acting shut-off device KH (ball valve) can only be closed via manual operation.

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.