Control valve 2-way DN 20-80mm - Nodular Cast Iron | Clorius Controls

Clorius G2F – 2-Way Control Valve DN20–DN80

The Clorius G2F is a flanged, double-seated control valve made from spheroidal graphite iron EN-GJS-400-15, rated at PN25. It is designed for flow regulation in hot water, steam, and thermal oil systems, applicable in industrial processes, district heating, central heating systems, and marine installations.

Construction and Standards

• DN20 to DN80.
• Flanges according to EN 1092-2 PN25.
• Available in DIN, ANSI, and JIS standards on the product page.
• Actuator connection: G1B as per ISO 228.
• Shaft, seats, and cone: stainless steel.
• Gasket: stainless steel foil and graphite.
• Counter flanges: DIN 2634.
• Pressure/temperature diagram according to DIN 2401.

Hydraulic Characteristics

The G2F is double-seated, selected when system pressure requires greater closing force than a single-seated valve with the available actuator can provide. The flow characteristic is quadratic, maintained until flow drops below approximately 4% of full flow. Seat leakage is ≤0.5% of Kvs as per VDI/VDE 2174, thus not suitable as a tight shut-off valve.

Kvs and Stroke

• DN20: Kvs 5 m³/h, stroke 6.5 mm.
• DN25: Kvs 7.5 m³/h, stroke 7 mm.
• DN32: Kvs 12.5 m³/h, stroke 8 mm.
• DN40: Kvs 20 m³/h, stroke 9 mm.
• DN50: Kvs 30 m³/h, stroke 10 mm.
• DN65: Kvs 50 m³/h, stroke 11 mm.
• DN80: Kvs 80 m³/h, stroke 13 mm.

Operation with Actuator

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

Installation

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