The Belimo Z3100QS-J+CQKXUP is a 1" sweat, 3-way diverting ZoneTight zone valve assembly: the Z3100QS-J forged brass ball valve (Cv 4.4, 0% leakage, 40 psi close-off) with the CQKXUP electrical fail-safe on/off actuator for AC 100...240 V supply.
Suited to large commercial buildings where higher close-off and the ability to change flow are needed. The valve fits space-restricted areas and assembles without tools: the actuator snaps onto the valve by hand, and its mounting orientation can be turned in 180° increments.
Specifications per Belimo Z3100QS-J technical data sheet rev 2025-01-09; CQKXUP actuator data sheet rev 2024-03-12. Reviewed 2026-10-09.
Best For
- Switching functions and 2-point control on the water side of air-handling units and heating systems
- Change-over (3-way diverting) duty in closed chilled and hot water systems
- Unit ventilators, fan coil units, VAV reheat coils, fin tube casing, radiant panels and duct coils
- Two-position (on/off) zone control
- Control circuits at AC 100...240 V
Warranty
Belimo ZoneTight valves carry a 5-year warranty. 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 and valve and actuator replacement is at the expense of others.
Key Features
3-way diverting ball valve
Diverting flow pattern for change-over duty, linear flow characteristic, Cv 4.4 and 0% leakage.
40 psi close-off
Close-off pressure 40 psi, maximum differential pressure 40 psi, body pressure rating 360 psi.
Electrical fail-safe
Bridging time 2 s, fail-safe running time <60 s.
Tool-free snap assembly
Actuator plugs onto the valve by hand; no tools or linkage needed.
Sweat connection
1" sweat ends; flow in both directions; install upright to horizontal.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
Valve: Belimo Z3100QS-J
| Valve size | 1" [25] (DN 25) |
| Flow pattern | 3-way Diverting |
| Pipe connection | Sweat |
| Cv | 4.4 |
| Fluid | chilled or hot water, up to 60% glycol |
| Fluid temp range (water) | 36...212°F [2...100°C] |
| Body pressure rating | 360 psi |
| Close-off pressure Δps | 40 psi |
| Differential pressure Δpmax | 40 psi |
| Flow characteristic | linear |
| Leakage rate | 0% |
| Operating mode | change-over zone valve adjusted by a rotary actuator controlled by an on/off signal |
| Flow direction | both directions possible |
| Flow setting | remove the end stop clip at the actuator to get the 90° angle of rotation needed for the change-over functionality |
| Installation orientation | upright to horizontal (in relation to the spindle); not in a hanging position with the stem pointing downwards |
| Actuator mounting | tool-free snap assembly; mounting orientation selectable in 180° increments |
| Water quality | keep free from particle debris; installation of a suitable strainer is recommended |
| Servicing | maintenance-free |
| Valve body | forged brass |
| Stem | brass |
| Stem seal | EPDM O-ring |
| Seat | PTFE, O-Ring EPDM |
| O-ring | EPDM (lubricated) |
| Ball | chrome plated brass |
| Suitable actuators | Non Fail-Safe CQB(X); Electronic fail-safe CQKB(X) |
| Valve weight | 0.57 lb [0.26 kg] |
| California Proposition 65 | WARNING: This product can expose you to lead which is known to the State of California to cause cancer and reproductive harm. For more information go to www.p65warnings.ca.gov |
Actuator: Belimo CQKXUP
| Actuator | CQKXUP: On/Off, Electrical fail-safe, 100...240 V |
| Nominal voltage | AC 100...240 V |
| Nominal voltage frequency | 50/60 Hz |
| Nominal voltage range | AC 85...265 V |
| Power consumption in operation | 3 W |
| Power consumption in rest position | 0.5 W |
| Transformer sizing | 7 VA |
| Electrical connection | 19 GA appliance cable, 1 m, with 1/2" NPT conduit connector |
| Overload protection | electronic throughout 0...90° rotation |
| Electrical protection | actuators are double insulated |
| Bridging time (PF) | 2 s |
| Pre-charging time | 5...20 s |
| Angle of rotation | 90° |
| Angle of rotation note | adjustable with mechanical stop |
| Running time (motor) | 75 s / 90° |
| Running time fail-safe | <60 s |
| Noise level, motor | 35 dB(A) |
| Noise level, fail-safe | 35 dB(A) |
| Position indication | pointer |
| 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 |
| Quality standard | ISO 9001 |
| UL 2043 compliant | Suitable for use in air plenums per Section 300.22(C) of the NEC and Section 602 of the IMC |
| Ambient humidity | Max. 95% RH, non-condensing |
| Ambient temperature | 35...104°F [2...40°C] |
| Storage temperature | -40...176°F [-40...80°C] |
| Actuator weight | 0.54 lb [0.25 kg] |
| Housing material | UL94-5VA |
Assembly dimensions
| Dimensions with CQK actuator, A / B / C | 5.3" [135] / 3.9" [100] / 5.6" [141] |
| Dimensions with CQK actuator, D / E / F | 2.8" [70] / 1.2" [30] / 1.2" [31] |
Documentation
FAQ
What is the Cv of the Belimo Z3100QS-J+CQKXUP?
Cv 4.4, with a linear flow characteristic and 0% leakage.
What close-off pressure does the Z3100QS-J+CQKXUP handle?
40 psi close-off, 40 psi maximum differential pressure and a 360 psi body pressure rating.
Does the end stop clip need to be removed on the Z3100QS-J+CQKXUP?
Yes. Remove the end stop clip at the actuator to get the 90° angle of rotation needed for the change-over functionality.
What power does the Z3100QS-J+CQKXUP draw?
3 W in operation and 0.5 W in rest position at AC 100...240 V, 50/60 Hz. Sizing value 7 VA.
What fluids can the Z3100QS-J+CQKXUP control?
Chilled or hot water, up to 60% glycol, from 36 to 212°F [2 to 100°C].
- Valve Pattern:
- 3-Way
- Valve Size:
- 1 Inch
- Connection Type:
- Sweat
- CV Rating:
- 4.4
- Actuator Type:
- Fail-Safe
- Voltage:
- 100-240VAC
- Control Signal:
- On/Off
- Auxillary Switch:
- None
