The Belimo Z2100QS-K+CQKB24-SR-LR is a 2-way, 1" sweat ZoneTight (QCV) zone valve assembly that pairs the Z2100QS-K forged brass ball valve (Cv 8.2, 75 psi close-off, 0% leakage) with the Belimo CQKB24-SR-LR electronic fail-safe actuator for modulating 2...10 V control with 2...10 V position feedback at 24 VAC/DC, driving to the closed position on power loss.
Specifications per Belimo Z2100QS-K technical data sheet (2024-06-12) and CQKB24-SR-LR technical data sheet (2024-06-27).
Best for
- Proportional zone control from a 2...10 V or 4...20 mA controller output
- Unit ventilators, fan coil units and VAV reheat coils
- Fin tube casing, radiant panels and duct coils
- Closed chilled-water and hot-water systems, up to 60% glycol
- Zones that must fail closed on loss of power
Key Features
Zero-leakage ball valve
Forged brass body with chrome plated brass ball, 0% leakage, equal-percentage flow and 75 psi close-off.
Field-adjustable Cv
The end stop clip limits maximum flow, with selectable end stop settings from Cv 0.5 to 8.2, set without tools.
Electronic fail-safe
Drives to the closed position on power loss after a 2 s bridging time; fail-safe running time <60 s.
Modulating with feedback
2...10 V control input (4...20 mA with ZG-R01 500 Ω resistor) and 2...10 V position feedback, 2 VDC Open / 10 VDC Close.
Tool-free snap assembly
Actuator snaps onto the valve by hand, mounts in 180° increments and lifts straight off for service.
Plenum rated
UL 2043 compliant for use in air plenums per NEC 300.22(C) and IMC 602.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
| Specification | Value |
|---|---|
| Assembly Part Number | Z2100QS-K+CQKB24-SR-LR |
| Valve Model | Z2100QS-K |
| Valve Series | ZoneTight (QCV) zone valve |
| Valve Size | 1" [DN 25] |
| Pipe Connection | Sweat |
| Flow Pattern | 2-way |
| Cv (full open) | 8.2 |
| Field-Adjustable Cv | Selectable end stop settings, Cv 0.5 to 8.2 |
| Flow Characteristic | Equal percentage |
| Leakage Rate | 0% |
| Body Pressure Rating | 360 psi |
| Close-off Pressure | 75 psi |
| Max. Differential Pressure | 40 psi |
| Fluid | Chilled or hot water, up to 60% glycol |
| Fluid Temperature | 36...212°F [2...100°C] |
| Valve Body | Forged brass |
| Ball | Chrome plated brass |
| Stem | Brass |
| Stem Seal | EPDM O-ring |
| Seat | PTFE, O-ring EPDM |
| Flow Direction | Both directions |
| Installation Orientation | Upright to horizontal (not stem down) |
| Servicing | Maintenance-free |
| Valve Weight | 1.2 lb [0.54 kg] |
| Actuator Model | CQKB24-SR-LR |
| Actuator Type | Electronic fail-safe |
| Control | Modulating 2...10 V |
| Control Direction | 2 VDC Open / 10 VDC Close |
| Fail Position | Closed |
| Nominal Voltage | AC/DC 24 V |
| Nominal Voltage Range | AC 19.2...28.8 V / DC 21.6...28.8 V |
| Frequency | 50/60 Hz |
| Power Consumption, Operation | 2.5 W |
| Power Consumption, Rest | 0.5 W |
| Transformer Sizing | 5 VA |
| Control Signal Range Y | 2...10 V |
| Current Input | 4...20 mA w/ ZG-R01 (500 Ω, 1/4 W resistor) |
| Position Feedback U | 2...10 V |
| Electrical Connection | 22 GA plenum cable, 3 ft [1 m], with 1/2" NPT conduit connector |
| Running Time (Motor) | 75 s / 90° |
| Bridging Time (Power Fail) | 2 s |
| Pre-charging Time | 5...20 s |
| Running Time, Fail-Safe | <60 s |
| Angle of Rotation | 90° |
| Rotation Adjustment | Adjustable with mechanical stop |
| Noise Level, Motor | 35 dB(A) |
| Position Indication | 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 |
| Agency Listing | cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02; CE acc. to 2014/30/EU and 2014/35/EU |
| Quality Standard | ISO 9001 |
| UL 2043 Plenum Rating | 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 | 0.55 lb [0.25 kg] |
Documentation
Belimo Z2100QS-K+CQKB24-SR-LR Technical Data Sheet Belimo Z2100QS-K Valve Technical Data Sheet Belimo CQK Actuator with ZoneTight Valve Installation Instructions Belimo ZoneTight Valve Brochure Belimo Zone Valve Guide SpecificationFrequently Asked Questions
What is the Cv of the Belimo Z2100QS-K+CQKB24-SR-LR?
The Z2100QS-K valve has a Cv of 8.2 at full open. The end stop clip positions limit maximum flow to Cv 0.5, 0.9, 1.5, 2.2, 3.1, 4.3, 6 and 8.2 with no end stop.
What close-off pressure is the valve rated for?
75 psi close-off, 40 psi maximum differential pressure and a 360 psi body pressure rating.
What control signal does it accept?
A 2...10 V input; a 4...20 mA signal can be used with the ZG-R01 500 Ω resistor. The actuator returns a 2...10 V position feedback signal and operates 2 VDC Open / 10 VDC Close.
What happens on a power failure?
After a 2 s bridging time the actuator drives the valve closed, with a fail-safe running time of <60 s. Pre-charging time is 5...20 s.
What transformer size is required?
Size the supply at 5 VA per actuator. Power consumption is 2.5 W in operation and 0.5 W at rest.
What fluids and temperatures can it handle?
Chilled or hot water with up to 60% glycol, at fluid temperatures of 36...212°F [2...100°C].
How should the valve be oriented?
Install upright to horizontal in relation to the stem; do not install with the stem pointing down. Flow is possible in both directions.
- Valve Pattern:
- 2-Way
- Valve Size:
- 1 Inch
- Connection Type:
- Sweat
- CV Rating:
- 8.2
- Max Close-Off Pressure:
- 75 psi
- Max Operating Pressure:
- 360 psi
- Medium Temperature Range:
- 36-212 °F
- Body Material:
- Forged Brass
- Actuator Type:
- Fail-Safe
- Fail-Safe Position:
- Fail Closed
- Voltage:
- 24VAC/DC
- Control Signal:
- 2-10VDC
- Auxillary Switch:
- None
- Power Connection:
- Plenum Cable
