Control valve balanced 2-way DN 15-80mm - Nodular Cast Iron | Clorius Controls

Clorius G1FBN – Balanced Control Valve 2-Way DN15–DN80

The Clorius G1FBN is a flanged two-way control valve, single-seated, with a body made of spheroidal graphite iron EN-GJS-400-15 and PN25. It is designed for hot water, steam, and thermal oil in industrial processes, district heating, central heating systems, and marine installations.

Construction and Standards

• DN15 to DN80.
• Flanges EN 1092-2 PN25 or ANSI B16.5 Class 150.
• Actuator connection: G1B as per ISO 228.
• Seat, cone, and stem: stainless steel.
• O-ring: A75H FEPM.
• Gasket: stainless steel foil.
• Flow characteristic: quadratic.
• Seat leakage: ≤0.05% of Kvs as per VDI/VDE 2174.
• Control range: Kvs/Kvr >25.

Kvs and Stroke

DN15: Kvs 4 m³/h, 7.5 mm.
DN20: Kvs 6.3 m³/h, 7.5 mm.
DN25: Kvs 10 m³/h, 9 mm.
DN32: Kvs 16 m³/h, 10 mm.
DN40: Kvs 25 m³/h, 11 mm.
DN50: Kvs 35 m³/h, 11.5 mm.
DN65: Kvs 58 m³/h, 14.5 mm.
DN80: Kvs 80 m³/h, 16 mm.

Application Selection

The G1FBN is selected when differential pressure requires greater closing force than a simple single-seated valve can provide, while double-seated valve leakage is unacceptable. Suitable for thermal load regulation in heat exchangers, heating networks, steam installations, and thermal oil circuits.

Operation with Actuator

Without an actuator, the valve remains open via a spring. It closes with force on the stem. Compatible with Clorius thermostats, differential pressure controllers, pneumatic or electric actuators. In temperature rise, the typical setup closes the valve; in cooling circuits, a reverse-acting electric actuator is required.

Installation

Install with vertical or horizontal stem. Up to 170°C, the thermostat or actuator can be mounted above or below the valve. Above 170°C, a cooling unit for the thermostat or a high-temperature adapter for the electric actuator is required.