The Belimo Z2100Q-K is a 1" NPT, 2-way ZoneTight zone valve (QCV): a forged brass ball valve with a chrome plated brass ball, Cv 8.2, 0% leakage, 75 psi close-off and a 360 psi body pressure rating, for chilled or hot water up to 60% glycol. It takes a CQB(X) non fail-safe or CQKB(X) electronic fail-safe ZoneTight actuator, sold separately.
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 Z2100Q-K technical data sheet rev 2024-12-17; CQ installation instructions 71694-00001.K; CQK installation instructions 71775-00001.L. Reviewed 2026-10-09.
Best For
- Unit ventilators, fan coil units and VAV reheat coils
- Fin tube casing, radiant panels and duct coils
- Space-restricted installations, assembled without tools
- Pairing with a CQB(X) non fail-safe or CQKB(X) electronic fail-safe actuator chosen for the zone
Warranty
Belimo warrants the valve for 5 years from the date of production. The warranty becomes invalid if fluid temperature exceeds 212°F because of a boiler control failure: the valve will safely contain the hot water, but valve and actuator replacement is then at the expense of others.
Key Features
Zero leakage ball valve
0% leakage rate, chrome plated brass ball, PTFE seat with EPDM O-rings, equal percentage flow characteristic.
75 psi close-off
Close-off pressure 75 psi, 40 psi maximum differential pressure and a 360 psi body pressure rating.
Field adjustable Cv
The end stop clip sets maximum flow in 2.5° increments, from Cv 0.5 at position 1 to Cv 8.2 with no end stop.
Two actuator families
Takes a CQB(X) non fail-safe or CQKB(X) electronic fail-safe ZoneTight actuator; the actuator mounts in 180° increments.
Tool-free snap assembly
Actuator plugs onto the valve by hand; no tools or linkage needed.
1" NPT connection
1" female NPT ends; flow in both directions; install upright to horizontal.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
Valve: Belimo Z2100Q-K
| Valve size | 1" [25] |
| Flow pattern | 2-way |
| Pipe connection | Internal thread, NPT (female) |
| Cv | 8.2 |
| 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 | 75 psi |
| Differential pressure Δpmax | 40 psi |
| Flow characteristic | equal percentage |
| Leakage rate | 0% |
| Valve angle of rotation | Operating range 15...90° |
| Controllable flow range | 75° |
| Flow direction | both directions possible |
| Installation orientation | upright to horizontal (in relation to the stem); not hanging with the stem pointing downwards |
| Flow setting | end stop clip in 2.5° increments; trigger an adaptation on modulating actuators after every change |
| 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 | 0.71 lb [0.3 kg] |
| Assembly dimensions A / B | 4.6" [118] / 2.8" [70] |
End stop clip positions
| End stop position | V'max |
|---|---|
| 1 | 0.5 |
| 2 | 0.9 |
| 3 | 1.5 |
| 4 | 2.2 |
| 5 | 3.1 |
| 6 | 4.3 |
| N | 6 |
| No end stop | 8.2 |
Documentation
FAQ
What is the Cv of the Belimo Z2100Q-K?
Cv 8.2 with no end stop. The end stop clip reduces maximum flow in steps down to Cv 0.5 at position 1.
What close-off pressure does the Z2100Q-K handle?
75 psi close-off, 40 psi maximum differential pressure and a 360 psi body pressure rating.
Which actuators fit the Belimo Z2100Q-K?
CQB(X) non fail-safe and CQKB(X) electronic fail-safe ZoneTight actuators. The actuator snaps onto the valve by hand, without tools.
Can the Z2100Q-K be installed with the stem pointing down?
No. Install it upright to horizontal in relation to the stem, never hanging with the stem pointing downwards. Flow is possible in both directions.
What fluids can the Z2100Q-K control?
Chilled or hot water, up to 60% glycol, from 36 to 212°F [2 to 100°C].
- Valve Pattern:
- 2-Way
- Valve Size:
- 1 Inch
- Connection Type:
- NPT
- 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:
- Valve Only
