FCR-REG-II - Flow regulators

Description

The FCR‑REG‑II series combustion ratio regulators are designed to maintain a precise and stable air‑to‑gas ratio in industrial combustion systems, particularly where preheated combustion air or variable‑pressure combustion chambers are used. They operate by using a differential pressure (Δp) signal generated by calibrated orifices (POP flanges) in the combustion air line. This Δp is proportional to real combustion‑air flow and is used to modulate the gas flow accordingly, ensuring consistent combustion conditions across all operating phases.

The gas flow regulators can be applied in four main configurations:
• FCR‑REG‑II‑STD for standard ratio control with preheated air.
• FCR‑REG‑II‑RMT for remote‑charged systems where gas Δp signals are used to stabilize supply in variable‑pressure chambers.
• FCR‑REG‑II‑PC for driving a BZR‑REG gas modulator when burner gas demand exceeds the regulator’s capacity.
• Premix systems where variable‑section burners require stable ratio control.

Main specifications of gas flow regulators include: maximum operating pressure 200 mbar, operating temperature –10°C to +60°C, flow ratio 10:1, and high precision both at low and full load (±0.1 mbar / ±1 mbar respectively). Materials include GAlSi 9.1 for the valve body, AISI303 disc, steel shaft, and EN549‑approved diaphragms. The regulator uses multiple membranes to balance dynamic and static forces, allowing reliable regulation even when hot air drastically changes density. All regulating components remain in the cold zone, reducing maintenance needs.

Installation must be strictly vertical, with horizontal piping and proper upstream/downstream straight lengths. Impulse signal lines must be metallic, undistorted, and at least 8 mm internal diameter. Upstream filtration ≤50 µm is required. Incorrect mounting orientation leads to malfunction.

Maintenance is limited: the regulators are non‑repairable and must be serviced or recalibrated only by qualified ESA‑Pyronics personnel. PC versions require periodic checks to ensure unobstructed venting. Adjustment is performed via a spring screw to set correct air/gas ratio at minimum load.