Description
Zone valve, 2-way, DN 20, External thread, G 3/4", PN 25, ps 1600 kPa, Kvs 7.8 m³/h, Fluid temperature 2...100°C [36...212°F] (with actuator 2...90°C)
The Belimo Zone Valve C420Q-K is an advanced, high-performance valve designed for closed cold and warm water systems, ideal for shut-off functions and modulating controls in air-handling units and heating systems. Featuring a tool-free snap-assembly actuator and adjustable kvs values, this valve ensures precision and reliability in various HVAC applications.
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Included Parts and Accessories
Standard Package:
Valve body
Rotary actuator (specific model based on control requirements)
Optional Accessories:
Spindle extension (Type: ZCQ-E)
Pipe connectors for DN15 (Rp 1/2") and DN20 (Rp 3/4") ball valves
Functional Data:
- Fluid: Cold and warm water, water with glycol up to max. 50% vol.
- Fluid Temperature: 2...100°C [36...212°F] with actuator: 2...90°C
- Close-off Pressure (∆ps): 520 kPa
- Differential Pressure (Δpmax): 280 kPa (50 kPa for low-noise operation)
- Flow Characteristic: Equal percentage (VDI/VDE 2173), optimised in the opening range
- Leakage Rate: Air-bubble tight, leakage rate A (EN 12266-1)
- Flow Setting: Adjustable in 2.5° increments
- Angle of Rotation: 90° (Operating range 15...90°)
- Pipe Connection: External thread according to ISO 228-1
- Installation Orientation: Upright to horizontal (in relation to the stem)
- Servicing: Maintenance-free
Materials:
- Valve Body: Brass
- Closing Element: Chrome-plated brass
- Spindle: Brass
- Spindle Seal: EPDM O-ring
- Seat: PTFE, O-ring EPDM
Safety and Compliance:
- Protection Class (IEC/EN): Rated according to specific actuator used
- Degree of Protection (NEMA/UL): Rated according to specific actuator used
- Certification: Compliance with EMC and other relevant standards
Operating Mode: The ball valve is adjusted by a rotary actuator, controlled by an open/close signal or a modulating control system.
Simple Direct Mounting: Tool-free snap assembly for quick and easy installation.
Flow Direction: Can operate in both flow directions.
Flow Setting Adjustability: Angle of rotation can be adjusted to set the kvs value, ensuring optimal flow rates.
Maintenance-Free Design: Engineered for long-term reliability with no maintenance required.
Installation Notes
Orientation: Install upright to horizontal. Avoid hanging positions.
Water Quality: Adhere to VDI 2035 water quality requirements to prevent particle debris.
Flow Setting: Adjust kvs value by modifying the actuator's angle of rotation. Trigger adaptation on modulating actuators after changes.
For more information and to explore our range of Belimo products, visit our website at https://ecospares.co.uk/collections/belimo. If you need any assistance, please get in touch with us on 01772 284 626.
