Gas Systems

	Zero pressure regulator;
	Zero pressure system.

Zero pressure regulator.

The balanced zero regulators feature a rugged, large diaphragm actuated valve assembly. Each is sensitively balanced at near zero pressure. A small pressure differential across the main diaphragm initiates gas flow. Gas supply is system-demand-modulated by signals from a Gas-air mixer or controlled pressure from an external source. Even with slight pressure variations, the regulators will deliver gas at exact pressure.

The unique design of the unit assures high accuracy over full flow range.

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Zero pressure system.

Preferable is the use of a zero pressure system (two pipe system).
Such a system means that gas by means of pressure regulators is kept at atmospheric (= zero overpressure) pressure. With a secondary pipe, clean combustion air is transported to the burner.
Mixing of gas and combusting air takes place in a gas-air mixer through a venturi. This venturi creates suction (under pressure) on the gas side, with a ratio cock on the gas side the gas amount can be adjusted very accurately.
This so called zero pressure system brings in terms of operation and maintenance numerous advantages:

No overpressure in the gas-pipe means reduction of danger for leaks etc.;

By means of a simple bypass with a leakage detection valve the gas system can easily be checked on leaks and errors at start up.

Bringing in clean combustion air through a closed system means no more burner pollution through flour, dust etc. and as a result of that less maintenance and a stable and proper combustion.

Further in this document we will point to facts, where a zero pressure system combined with burner management brings advantages if moisture control and color are part of the total oven control.

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