The Belimo Z3050Q-H is a ZoneTight QCV 3-way diverting zone valve body: a 1/2" NPT female forged brass ball valve with Cv 2.7, linear flow and 0% leakage, supplied without an actuator.
The valve closes off against 40 psi, carries a 360 psi body pressure rating and handles chilled or hot water with up to 60% glycol from 36 to 212°F. Its compact body fits space restricted equipment, and the actuator snaps on by hand with no tools or linkage. Order it on its own to pair with a separately purchased CQB or CQKB actuator, or as a replacement Z3050Q-H valve body.
Best For
- Change-over and diverting duty on fan coil units and unit ventilators
- VAV reheat coils, duct coils and fin tube casing
- Radiant panels in closed chilled and hot water systems
- Space restricted installations in commercial buildings
- Replacing a valve body or pairing with a CQB or CQKB actuator already on hand
Warranty
5-year Belimo warranty covering ZoneTight valve components.
If the 212°F operating range is exceeded due to a boiler control failure, the valve will safely contain the hot water but the manufacturer warranty becomes invalid.
Key Features
Zero-leakage ball valve
Leakage rate 0% with a chrome plated brass ball, PTFE seat and EPDM O-rings.
3-way diverting, Cv 2.7
Linear flow characteristic through a 1/2 in. NPT female forged brass body; flow is possible in both directions.
High pressure capability
Body pressure rating 360 psi with 40 psi close-off and 40 psi maximum differential pressure.
Actuator ready
Accepts CQB(X) non fail-safe or CQKB(X) electronic fail-safe ZoneTight actuators with tool-free snap assembly.
Wide fluid range
Chilled or hot water up to 60% glycol, 36...212°F [2...100°C].
Maintenance-free
Install upright to horizontal; the actuator mounts in 180° increments.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
Valve
| Valve type | ZoneTight QCV zone valve, 3-way, internal thread |
|---|---|
| Valve size | 1/2 in. [DN 15] |
| Pipe connection | Internal thread, NPT (female) |
| Flow pattern | 3-way diverting |
| Flow characteristic | Linear |
| Cv | 2.7 |
| Fluid | Chilled or hot water, up to 60% glycol |
| Fluid temperature range | 36...212°F [2...100°C] |
| Body pressure rating | 360 psi |
| Close-off pressure | 40 psi |
| Maximum differential pressure | 40 psi |
| Leakage rate | 0% |
| Flow direction | Both directions possible |
| Installation orientation | Upright to horizontal; not stem-down |
| 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 |
| Valve weight | 0.44 lb [0.2 kg] |
| Suitable actuators | CQB(X) non fail-safe; CQKB(X) electronic fail-safe |
| Valve body length (B) | 2.0 in. [52 mm] |
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
Documentation
FAQ
What is the Cv of the Belimo Z3050Q-H?
The Z3050Q-H has a Cv of 2.7 with a linear flow characteristic in a 3-way diverting pattern.
What close-off pressure does the Z3050Q-H handle?
Close-off pressure is 40 psi, maximum differential pressure is 40 psi and the body pressure rating is 360 psi.
Which actuators fit this valve?
CQB(X) non fail-safe actuators and CQKB(X) electronic fail-safe actuators snap onto the valve without tools.
Why remove the actuator end stop clip?
The end stop clip must be removed from the actuator to get the 90° angle of rotation the change-over function needs.
How must the valve be installed?
Upright to horizontal in relation to the stem. Do not install it hanging with the stem pointing downward. A strainer is recommended.
What fluids and temperatures is the Z3050Q-H rated for?
Chilled or hot water with up to 60% glycol, 36...212°F [2...100°C], in closed systems.
Specifications sourced from Belimo Z3050Q-H technical data sheet (2026-02-07); verified 2026-10-09.
- Valve Pattern:
- 3-Way
- Valve Size:
- 1/2 Inch
- Connection Type:
- NPT
- CV Rating:
- 2.7
- Max Close-Off Pressure:
- 40 psi
- Max Operating Pressure:
- 360 psi
- Medium Temperature Range:
- 36-212 °F
- Body Material:
- Forged Brass
- Actuator Type:
- Valve Only
