The Belimo Z2075Q-K+CQX24-SR is a 3/4 in. NPT, 2-way ZoneTight (QCV) zone valve assembly that pairs the Z2075Q-K valve (Cv 9.8, 0% leakage) with the CQX24-SR non fail-safe actuator for modulating 2...10 V or 0.5...10 V control at AC/DC 24 V: X model with factory clip setting.
The ball valve closes off against 75 psi and handles chilled or hot water with up to 60% glycol from 36 to 212°F. The body is forged brass with a chrome plated brass ball and a 360 psi body pressure rating. The actuator snaps onto the valve by hand, with no tools or linkage.
Best For
- Unit ventilators
- Fan coil units
- VAV reheat coils
- Fin tube casing
- Radiant panels
- Duct coils
- Large commercial buildings where higher close-off and the ability to change flow is needed
- Space-restricted installations
Warranty
Belimo warrants ZoneTight zone valve components for 5 years from the date of production. If fluid temperature exceeds the 212°F operating range because of a boiler control failure, the valve will safely contain the hot water but the manufacturer warranty becomes invalid.
Key Features
0% leakage ball valve
Chrome plated brass ball on a PTFE seat with EPDM O-rings: 0% leakage and an equal percentage flow characteristic.
Factory clip setting
X model actuator: the end stop clip is set at the factory to the maximum flow position specified at order.
Tool-free snap assembly
The actuator plugs onto the valve by hand, with the mounting orientation selectable in 180° increments.
75 s runtime
Non fail-safe actuator, 75 s / 90° motor running time.
Modulating with feedback
Accepts 2...10 V or 0.5...10 V (4...20 mA with the ZG-R01 500 Ω resistor) and returns a 2...10 V position feedback signal.
Low power draw
0.4 W in operation, 0.3 W at rest; size the transformer at 1 VA.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
Valve
| Valve model | Z2075Q-K |
| Valve type | ZoneTight (QCV) zone valve, 2-way, NPT |
| Cv (no end stop) | 9.8 |
| Nominal size | 3/4 in. [DN 20] |
| Pipe connection | Internal thread NPT (female) |
| Flow pattern | 2-way |
| Flow characteristic | Equal percentage |
| Leakage rate | 0% |
| Fluid | Chilled or hot water, up to 60% glycol |
| Fluid temperature range (water) | 36...212°F [2...100°C] |
| Body pressure rating | 360 psi |
| Close-off pressure (Δps) | 75 psi |
| Differential pressure (Δpmax) | 40 psi |
| Operating range (angle of rotation) | 15...90° |
| Controllable flow range | 75° |
| Flow direction | Both directions possible |
| Installation orientation | Upright to horizontal; not hanging with the stem pointing downwards |
| Valve body | Forged brass |
| Ball | Chrome plated brass |
| Stem | Brass |
| Stem seal | EPDM O-ring |
| Seat | PTFE, O-ring EPDM |
| O-ring | EPDM (lubricated) |
| Servicing | Maintenance-free |
Actuator
| Actuator model | CQX24-SR |
| Actuator type | Modulating, Non fail-safe, 24 V |
| Nominal voltage | AC/DC 24 V |
| Nominal voltage frequency | 50/60 Hz |
| Nominal voltage range | AC 19.2...28.8 V / DC 21.6...28.8 V |
| Power consumption in operation | 0.4 W |
| Power consumption in rest position | 0.3 W |
| Transformer sizing | 1 VA |
| Electrical connection | 22 GA plenum cable, 3 ft [1 m], with 1/2 in. NPT conduit connector |
| Operating range Y | 2...10 V |
| Operating range Y, 4...20 mA | 4...20 mA w/ ZG-R01 (500 Ω, 1/4 W resistor) |
| Operating range Y, variable | 0.5...10 V |
| Feedback signal U | 2...10 V |
| Feedback signal U, variable | 0.5...10 V |
| Angle of rotation | 90° |
| Angle of rotation adjustment | adjustable with mechanical stop |
| Running time (motor) | 75 s / 90° |
| Noise level, motor | 35 dB(A) |
| Visual indicator | pointer |
| Overload protection | electronic throughout 0...90° rotation |
| Electrical protection | actuators are double insulated |
| Power source UL | Class 2 Supply |
| Degree of protection IEC/EN | IP40 |
| Degree of protection NEMA/UL | NEMA 2 |
| Enclosure | UL Enclosure Type 2 |
| Agency listing | cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02 CE acc. to 2014/30/EU and 2014/35/EU |
| UL 2043 compliant | Suitable for use in air plenums per Section 300.22(C) of the NEC and Section 602 of the IMC |
| Ambient temperature | 35...104°F [2...40°C] |
| Ambient humidity | Max. 95% RH, non-condensing |
| Storage temperature | -40...176°F [-40...80°C] |
| Housing material | UL94-5VA |
| Actuator weight | 0.39 lb [0.18 kg] |
Maximum Cv by end stop clip position (X models: set at the factory)
| Clip position | 1 | 2 | 3 | 4 | 5 | 6 | N | No end stop |
|---|---|---|---|---|---|---|---|---|
| Max Cv | 0.5 | 1.0 | 1.5 | 2.3 | 3.3 | 4.6 | 6.6 | 9.8 |
| Runtime (s) | 30 | 37 | 43 | 49 | 55 | 62 | 68 | 75 |
Specifications per Belimo Z2075Q-K technical data sheet rev 2024-06-12, CQX24-SR technical data sheet rev 2024-06-27, CQ Quick Mount manual 71694-00001.K. Reviewed 2026-09-24.
Documentation
FAQ
What is the Cv of the Belimo Z2075Q-K+CQX24-SR?
The Z2075Q-K valve has a Cv of 9.8 at full rotation. On this X model actuator the end stop clip that limits maximum Cv is set at the factory to the position specified at order.
What size and pipe connection is the Belimo Z2075Q-K?
3/4 in. (DN 20), internal thread NPT (female). The forged brass body is rated 360 psi, with a 75 psi close-off and 40 psi maximum differential pressure.
What fluids and temperatures can the Z2075Q-K handle?
Chilled or hot water with up to 60% glycol, at fluid temperatures of 36...212°F [2...100°C].
What control signal does the Belimo CQX24-SR actuator use?
Modulating 2...10 V or 0.5...10 V, on AC/DC 24 V. A 4...20 mA signal can be used with the ZG-R01 500 Ω resistor.
Is the Belimo CQX24-SR a fail-safe actuator?
No. It is a non fail-safe actuator. Belimo CQKB(X) electrical fail-safe actuators are listed as suitable for the Z2075Q-K valve.
- Valve Pattern:
- 2-Way
- Valve Size:
- 3/4 Inch
- Connection Type:
- NPT
- CV Rating:
- 9.8
- Actuator Type:
- Non Fail-Safe
- Voltage:
- 24VAC/DC
- Control Signal:
- 2-10VDC
- Auxillary Switch:
- None
