SR400/SR500/SR600 — two-stage gas pressure regulators (hi-lo), nominal inlet 3.4 kPa
Country: Germany · Model: SR400/SR500/SR600
SR400, SR500 and SR600 two-stage gas pressure regulators with a nominal inlet pressure of 3.4 kPa and a capacity of up to 28.3 m³/h. One device sets two outlet pressure levels, high and low flame, so a separate regulator and a second gas manifold for the burner are not needed.
- Models
- SR400, SR500, SR600
- Connections
- 3/8"–1" NPT or ISO 7-1 thread
- Function
- pressure regulation + staged flame change (two outlet pressure setpoints)
- Nominal inlet pressure
- CSA: 1/2 psi (3.4 kPa); tested by the manufacturer up to 1 psi (6.9 kPa)
Technical specifications
| Models | SR400, SR500, SR600 |
|---|---|
| Connections | 3/8"–1" NPT or ISO 7-1 thread |
| Function | pressure regulation + staged flame change (two outlet pressure setpoints) |
| Nominal inlet pressure | CSA: 1/2 psi (3.4 kPa); tested by the manufacturer up to 1 psi (6.9 kPa) |
| Emergency limit | 2.5 psi (17.2 kPa) |
| Flow | up to 1000 CFH (28.3 m³/h) |
| Body | aluminium, vertical mounting only |
| Ambient temperature | −40…+79 °C |
| Certification | ANSI Z21.18/CSA 6.3 (except versions with the -2 suffix) |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The SR series combines pressure regulation and staged flame change (hi-lo) without an extra regulator or duplicate piping. The connection is threaded from 3/8 to 1 inch (NPT or ISO 7-1), the body is aluminium, and mounting is vertical only. The nominal inlet pressure under CSA is 1/2 psi (3.4 kPa), the manufacturer tests the regulators at 1 psi (6.9 kPa), and the emergency limit at the inlet is 2.5 psi (17.2 kPa). Capacity reaches 1000 cubic feet per hour (28.3 m³/h), and ambient temperature is from −40 to +79 °C. The regulators work on natural, manufactured and mixed gases, LPG and LPG-air mixtures. Certification to ANSI Z21.18/CSA 6.3 covers all versions except those with the -2 suffix. Typical applications are direct-fired air heaters with two-speed fans, outdoor heaters, and switching between LPG and natural gas. A nominal inlet of up to 5 kPa classes the device as low-pressure equipment.
How to choose
SR400, SR500 and SR600 are chosen by gas flow and connection; diagrams of minimum controllable flow and capacity are given in the manufacturer's catalogue. If the inlet pressure is above 3.4 kPa but does not exceed the tested 6.9 kPa, the manufacturer's instructions apply. For other tasks there are direct-acting regulators RV52–RV111 with an inlet up to 20 kPa and lever-type 325 with an inlet up to 100 kPa.
Request a price and lead time
SR400/SR500/SR600 — two-stage gas pressure regulators (hi-lo), nominal inlet 3.4 kPa. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What inlet pressure do SR regulators allow?
Nominal under CSA 3.4 kPa, manufacturer's tests up to 6.9 kPa, emergency limit 17.2 kPa.
What is the capacity of SR regulators?
Up to 1000 cubic feet per hour, that is 28.3 m³/h.
Can SR be mounted horizontally?
No, only vertical mounting is permitted; the body is aluminium.
What gases and temperatures does SR work with?
Natural, manufactured and mixed gases, LPG and its mixtures with air, at an ambient temperature from −40 to +79 °C.
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