S6500, S8500, S9500 — two-stage industrial gas regulators for constant outlet pressure, inlet up to 200 bar, outlet up to 10 bar

Country: Italy · Model: S6500 / S8500 / S9500

The S6500, S8500 and S9500 reduce pressure in two stages, so an outlet pressure of up to 10 bar stays constant while a cylinder with an inlet of up to 200 bar empties. The body is forged brass, weight 2.0–2.4 kg, complying with ISO 2503. They are used at welding, cutting, heating and inerting stations and in laboratories.

Type: two-stage (multistage) diaphragm regulator, forged brass body
Series: S6500 (medium-heavy duty), S8500 and S9500 (heavy)
Gases: acetylene, argon/helium, nitrogen, CO₂, hydrogen, oxygen, Ar/CO₂ mixtures (S6500)
Inlet pressure: 25 bar (acetylene), 200 bar (compressed gases)

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Technical specifications

Type	two-stage (multistage) diaphragm regulator, forged brass body
Series	S6500 (medium-heavy duty), S8500 and S9500 (heavy)
Gases	acetylene, argon/helium, nitrogen, CO₂, hydrogen, oxygen, Ar/CO₂ mixtures (S6500)
Inlet pressure	25 bar (acetylene), 200 bar (compressed gases)
Outlet pressure	0–1.5 bar (acetylene), 0–4 bar (CO₂, mixtures), 0–10 bar (Ar/He, N₂, H₂, O₂)
Nominal flow to ISO 2503	5 m³/h (acetylene), 30 m³/h (other gases)
Gas purity	for laboratories, gases with purity up to 4.0
Indication	dual-scale gauges to ISO 5171; S6500 has a 0–45 l/min flowmeter tube and a 0–32 l/min flowmeter for mixtures
Weight	2.0 kg (S6500), 2.1 kg (S8500), 2.4 kg (S9500)
Standards	ISO 2503; degreased for oxygen, tested at maximum inlet pressure

Specifications are taken from the manufacturer’s technical documentation. Updated 11/13/2026.

Description

The S6500 belongs to medium-heavy duty, the S8500 and S9500 to heavy duty. The valve assembly is made with EV technology, and the encapsulated valve has a built-in sintered filter. The gas-contact parts have a Monel 500 spring, PTFE TFM 1700 seals, a sintered CuNi filter and a neoprene diaphragm. All regulators are degreased for oxygen and tested at maximum inlet pressure, with dual-scale gauges to ISO 5171. For acetylene the inlet is 25 bar and the outlet 0–1.5 bar. For argon, helium, nitrogen, hydrogen and oxygen the inlet is 200 bar and the outlet 0–10 bar, for CO₂ 200 bar and 0–4 bar. The S6500 is additionally available for Ar/CO₂ mixtures with a 0–45 l/min flowmeter tube (outlet 0–4 bar) and with a preset pressure of 4 bar and a 0–32 l/min flowmeter. Nominal flow to ISO 2503 is 5 m³/h for acetylene and 30 m³/h for the other gases. Laboratories can work with gases of purity up to 4.0. Inlet and outlet connections are made to the customer's requirements.

How to choose

Take the two-stage design when stable pressure is needed regardless of the gas remaining in the cylinder. Select the duty by load. The S6500 weighs 2.0 kg, the S8500 2.1 kg, the S9500 2.4 kg. For Ar/CO₂ shielding mixtures only the S6500 is available. If the pressure in a manifold or monoblock exceeds 200 bar, the same line has the S5200 HP/UHP, and the simpler single-stage S5000, S6000, S6000D and S8000 have an inlet of up to 300 bar.

Request a price and lead time

S6500, S8500, S9500 — two-stage industrial gas regulators for constant outlet pressure, inlet up to 200 bar, outlet up to 10 bar. We reply within one business day.