The Belimo Z3075QPF-J+CQKB24-S-LL is a 3/4 in. press fit, 3-way diverting ZoneTight (QCV) zone valve assembled with an electronic fail-safe CQKB24-S-LL actuator for on/off control with a fail position of 100% Open. The forged brass valve has a Cv of 4.6, a linear flow characteristic, 0% leakage and a 40 psi close-off pressure, and it is rated for chilled or hot water with up to 60% glycol from 36 to 212°F. The change-over valve is adjusted by the rotary actuator, which is controlled by an on/off signal. The actuator runs on AC/DC 24 V (2.5 W in operation, 5 VA transformer sizing), and it has one built-in SPST auxiliary switch rated 1 A resistive @ DC 30 V.
Specifications verified 2026-10-09 against Belimo Z3075QPF-J technical data sheet (rev. 2024-12-17) and Belimo Z3075QPF-J+CQKB24-S-LL assembly data sheet (actuator rev. 2024-03-15).
Best For
- Closed chilled and hot water systems
- Switching functions and 2-point control on the water side of air-handling units and heating systems
- Unit ventilators, fan coil units, VAV reheat coils, fin tube casing, radiant panels and duct coils
- Space-restricted installations where the valve must be assembled without tools
- Applications that require the valve to drive to 100% Open on power loss
Warranty
5-year Belimo manufacturer warranty, subject to Belimo's terms and conditions of sale. If the fluid temperature exceeds the 212°F operating range due to a boiler control failure, the valve will safely contain the hot water but the manufacturer warranty becomes invalid.
Key Features
3-Way Diverting Ball Valve
Change-over ball valve with a Cv of 4.6, linear flow characteristic and 0% leakage. Flow is possible in both directions.
40 psi Close-Off
Close-off pressure and maximum differential pressure of 40 psi, with a 250 psi body pressure rating.
Tool-Free Snap Assembly
The actuator plugs onto the valve by hand, and the mounting orientation can be selected in 180° increments. Remove the end stop clip so the actuator rotates the full 90° needed for change-over.
Electronic Fail-Safe
Electronic fail-safe on/off actuator with a fail position of 100% Open. Fail-safe running time is <60 s, with 5...20 s pre-charging time.
Built-In Auxiliary Switch
One SPST auxiliary switch rated 1 A resistive @ DC 30 V for end position indication, interlock control or fan startup.
Plenum Rated
UL 2043 compliant: suitable for use in air plenums per Section 300.22(C) of the NEC and Section 602 of the IMC.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
Valve: Belimo Z3075QPF-J
| Valve size [DN] | 0.75" [20] |
|---|---|
| Flow pattern | 3-way Diverting |
| Cv | 4.6 |
| Flow characteristic | linear |
| Leakage rate | 0% |
| Body pressure rating | 250 psi |
| Close-off pressure Δps | 40 psi |
| Differential pressure Δpmax | 40 psi |
| Fluid | chilled or hot water, up to 60% glycol |
| Fluid temperature range (water) | 36...212°F [2...100°C] |
| Pipe connection | Press fit |
| Installation orientation | upright to horizontal (in relation to the spindle) |
| Flow direction | both directions possible |
| Valve body | forged brass |
| Stem | brass |
| Stem seal | EPDM O-ring |
| Seat | PTFE, O-Ring EPDM |
| Ball | chrome plated brass |
| Servicing | maintenance-free |
Actuator: Belimo CQKB24-S-LL
| Actuator | CQKB24-S-LL |
|---|---|
| Control | On/Off |
| Fail-safe | Electronic fail-safe |
| Fail position | 100% Open |
| 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 | 2.5 W |
| Power consumption in rest position | 0.5 W |
| Transformer sizing | 5 VA |
| Electrical connection | 22 GA plenum cable, 3 ft [1 m], with 1/2" NPT conduit connector |
| Auxiliary switch | 1x SPST, 1 A resistive @ DC 30 V |
| Overload protection | electronic throughout 0...90° rotation |
| Electrical protection | actuators are double insulated |
| Angle of rotation | 90° |
| Running time (motor) | 75 s / 90° |
| Running time fail-safe | <60 s |
| Bridging time (PF) | 2 s |
| Pre-charging time | 5...20 s |
| Noise level, motor | 35 dB(A) |
| Noise level, fail-safe | 35 dB(A) |
| Position indication | pointer |
| 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 |
| 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] |
| Housing material | UL94-5VA |
| Actuator weight | 0.57 lb [0.26 kg] |
| Auxiliary switch contacts | S1 / S2, NO |
Documentation
FAQ
What is the Cv of the Belimo Z3075QPF-J+CQKB24-S-LL?
The Z3075QPF-J valve has a Cv of 4.6 with a linear flow characteristic and 0% leakage.
Is the Belimo Z3075QPF-J+CQKB24-S-LL a mixing or diverting valve?
It is a 3-way diverting (change-over) ZoneTight ball valve. Flow is possible in both directions.
Can the maximum Cv of the Z3075QPF-J+CQKB24-S-LL be field adjusted?
No. On this 3-way change-over valve the end stop clip on the actuator has to be removed to get the 90° angle of rotation needed for change-over.
What is the close-off pressure of the Z3075QPF-J+CQKB24-S-LL?
Close-off pressure and maximum differential pressure are both 40 psi. The body pressure rating is 250 psi.
What control signal and power does the CQKB24-S-LL actuator need?
The change-over valve is controlled by an on/off signal. The CQKB24-S-LL runs on AC/DC 24 V, with 5 VA transformer sizing.
What happens to the Z3075QPF-J+CQKB24-S-LL on power loss?
The CQKB24-S-LL is an electronic fail-safe actuator. On power loss it drives to its fail position of 100% Open, with a fail-safe running time of <60 s.
Does the Z3075QPF-J+CQKB24-S-LL have an auxiliary switch?
Yes. It has one built-in SPST auxiliary switch rated 1 A resistive @ DC 30 V.
What fluids and temperatures can the Z3075QPF-J+CQKB24-S-LL handle?
Chilled or hot water with up to 60% glycol, from 36 to 212°F [2 to 100°C], in closed systems.
- Valve Pattern:
- 3-Way
- Valve Size:
- 3/4 Inch
- Connection Type:
- Press Fit
- CV Rating:
- 4.6
- Actuator Type:
- Fail-Safe
- Voltage:
- 24VAC/DC
- Control Signal:
- On/Off
- Auxillary Switch:
- (1) SPST 1A @ 30VDC
