C225QPT-G - Belimo 2-way PI Zone Valve, DN 25

C225QPT-G - 2-way PI Zone Valve, DN 25

• DN 25, 2-way, Rp 3/4", internal thread
• Vnom 980 l/h, with measuring nipple
• Housing brass body nickel-plated
• Closing element stainless steel
• Stem stainless steel
• Stem seal O-ring EPDM, valve seat PTFE
• Leakage rate A, leak-proof (EN 12266-1)
• Medium temperature +2…+90 °C
• Equal-percentage characteristic curve (VDI/VDE 2178)

Principle of operation: The ball valve is adjusted by a rotary actuator. The actuator is controlled by a commercially available modulating or 3-point control system and moves the ball of the valve – the throttling device – to the position dictated by the positioning signal. Open the characterised control valve counterclockwise and close it clockwise.

Flow characteristic: Equal percentage flow control is ensured by the special design of the ball.

Constant flow volume: With a differential pressure of 16…350 kPa, a constant flow volume is achieved thanks to the integrated pressure regulationg valve. Independent of the differential pressure through the valve, a valve authority of 1 is achieved. Even with pressure variatons and in the partial load range, the flow rate remains constant with each respective opening position (angle of rotation) and ensures a steady control.

Flow limitation: Instead of the electric actuator, the PIQCV-valve can also be operated with a flow limiter (see accessories). The flow limiter ensures that the heat exchanger is continuously supplied with a manually fixed amount of water.

Measurement ports (P/T ports): The C2..QPT-.. type valves have two measurement ports. The total drop in pressure across the valve can be determined using the measurement points at the valve inlet (P1) and outlet (P3). The measurement ports can be used to easily establish whether the effective differential pressure across the valve is within the effective pressure range of 16…350 kPa. If it is, the valve operates independently of pressure and the correct flow rate is automatically ensured by the valve according to the setting table. The differential pressure measurement can also be used to optimise the pump setting. This involves reducing the delivery height of the pump until only the minimum differential pressure required (16 kPa) is still present across the valve at the point of lowest pressure (the furthest away from the pump in hydraulic terms).

Functional data:

• Media Cold and warm water, water with glycol up to max. 50% vol.
• Medium temperature 2...90°C
• Pressure value 16...350 kPa
• Permissible pressure ps 1600 kPa
• Closing pressure ∆ps 700 kPa
• Flow characteristic equal percentage (VDI/VDE 2178), optimised in the opening range
• Pressure stability With a pressure value of 16...350 kPa: ±10%
• Leakage rate Leakage rate A, tight (EN 12266-1)
• Flow setting see Installation instructions
• Pipe connectors Internal thread according to ISO 7-1
• Angle of rotation 90° (Operating range 15...90°)
• Installation position Upright to horizontal (in relation to the stem)
• Maintenance Maintenance-free

Materials: 

• Housing Brass body
• Closing element Stainless steel
• Stem Stainless steel
• Stem seal O-ring EPDM
• Valve seat PTFE, O-ring EPDM
• Diaphragm EPDM

Terms:

Abbreviations Vnom = nominal flow with valve completely opened, Vmax = maximum flow set by the angle of rotation limitation on the actuator