RZ, 210Z and R700Z zero governors for gas-air mixing, inlet up to 36 kPa

Country: Germany · Model: RZ / 210Z / R700Z

Zero governors RZ (R400Z, R500Z, R600Z), 210Z and R700Z for gas-air mixing in burners. Outlet pressure is kept close to atmospheric, and gas flow follows the vacuum created by the air stream. Inlet pressure is up to 10 kPa in RZ and up to 36 kPa in 210Z.

RZ: R400Z, R500Z, R600Z; Rp 3/8 – Rp 1; inlet up to 10 kPa
210Z: 210DZ, 210EZ, 210GZ (Rp 1 – Rp 3), 210JZ (DN 100, PN 16); inlet up to 36 kPa
R700Z: 1" and 1 1/4" NPT (ISO 7-1); 10–2500 CFH (≈0.3–71 m³/h); −40…+96 °C; optional adjustable bypass
Principle: balanced valve, outlet pressure held near zero (atmospheric)

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Technical specifications

RZ	R400Z, R500Z, R600Z; Rp 3/8 – Rp 1; inlet up to 10 kPa
210Z	210DZ, 210EZ, 210GZ (Rp 1 – Rp 3), 210JZ (DN 100, PN 16); inlet up to 36 kPa
R700Z	1" and 1 1/4" NPT (ISO 7-1); 10–2500 CFH (≈0.3–71 m³/h); −40…+96 °C; optional adjustable bypass
Principle	balanced valve, outlet pressure held near zero (atmospheric)
Applications	premix burners, nozzle mixers, mixing tees, proportional premixers
Body	aluminium
Ambient temperature	−15…+80 °C (RZ/210Z)
Standards	Regulation (EU) 2016/426, EN 88-1 (RZ/210Z); ANSI Z21.18/CSA 6.3 (R700Z)

Specifications are taken from the manufacturer’s technical documentation. Updated 11/06/2026.

Description

The amount of gas entering the mixer is determined by the vacuum from the air stream, so gas and air stay proportional over the whole power range. RZ have Rp 3/8 – Rp 1 threads per ISO 7-1 / EN 10226-1 and are mounted in any position. The 210Z series includes 210DZ (Rp 1 – Rp 1 1/2), 210EZ (Rp 1 1/2 – Rp 2), 210GZ (Rp 2 1/2 – Rp 3) and the flanged 210JZ DN 100 per ISO 7005-2, PN 16, with vertical mounting only. The bodies are aluminium, ambient temperature is from −15 to +80 °C, certification is per Regulation (EU) 2016/426 and EN 88-1, and gases per EN 437. No spring replacement is needed in zero governors. The R700Z, introduced in 2024, is a cost-effective alternative to FRS regulators as a mixing control valve. It has 1 and 1 1/4 NPT (ISO 7-1) connections, a range of 10–2500 cubic feet per hour, ambient temperature from −40 to +96 °C and ANSI Z21.18/CSA 6.3 certification, and optionally a built-in adjustable bypass for an accurate minimum flow.

How to choose

For premix burners, nozzles and mixing tees take a zero governor. RZ suits inlet pressure up to 10 kPa, 210Z up to 36 kPa, and R700Z appliances with a range of 10–2500 CFH. If you need an ordinary pressure stabilizer ahead of the burner, look at R/RS and 210 with a balanced valve, and for lockup at zero flow 325.

Request a price and lead time

RZ, 210Z and R700Z zero governors for gas-air mixing, inlet up to 36 kPa. We reply within one business day.

Or email office@usk.ua or call +38 (044) 339-50-20.

FAQ

What is a zero governor?

It is a regulator that holds outlet pressure close to atmospheric, so gas flow is set by the vacuum from the air stream. This keeps gas and air proportional.

What is the inlet pressure of RZ and 210Z?

Up to 10 kPa for RZ and up to 36 kPa for 210Z.

Does the spring in RZ regulators need replacing?

No, spring replacement is not needed for zero governors.

What is the flow range of R700Z?

10–2500 cubic feet per hour, ambient temperature from −40 to +96 °C. An adjustable bypass for minimum flow is optionally available.

How should 210Z and RZ regulators be mounted?

210Z vertically only, RZ in any position. The 210JZ has a DN 100 flange per ISO 7005-2, PN 16.