High-pressure air pressure regulators 302 with inlet up to 60 bar

Current design

High-pressure regulators of the 302 series by EWO reduce the pressure of compressed air from a high-pressure air network or air receiver – up to 60 bar – to the working pressure required by the machine, test equipment or process. They keep the set pressure constant even when the network pressure fluctuates and air consumption changes.

They are piston regulators with secondary venting: when you reduce the set pressure, they release the excess air from the outlet by themselves, even with no air being consumed. Four control ranges cover pressures from 0.5 to 50 bar, and a ⌀ 63 mm pressure gauge is included. The two body sizes have flow rates of 2,175 to 5,437 l/min and threads from G 1/4" to G 1".

What the 302 regulators offer

• inlet pressure up to 60 bar (PN 60), outlet pressure up to 50 bar
• secondary venting – you can reduce the outlet pressure even with no air being consumed
• piston design, the outlet pressure is almost independent of the network pressure
• ⌀ 63 mm pressure gauge included, front or rear mounting
• control ranges 0.5–12, 1–20, 2–35, 3–50 bar
• any mounting position, air flows in the direction of the arrow
• for compressed air as well as neutral and non-toxic gases
• brass body, NBR seals, operation from −10 to +90 °C

Two body sizes

The body size determines the flow rate and dimensions. The smaller BG 30 is made with G 1/4" and G 3/8" connections, the larger BG 60 with a G 1" connection. The G 1/4" version is a G 3/8" body with reducers at the inlet and outlet, which is why its flow rate is slightly lower.

* reduced inlet and outlet, reducers from G 3/8" supplied · Flow rate according to the manufacturer at an inlet pressure of 20 bar, an outlet pressure of 10 bar and a pressure drop of 4 bar. Dimensions: length × width with pressure gauge × height with handle.

All regulators with inlet up to 60 bar

How to choose a regulator

1. Control range according to the working pressure. Choose a range whose upper limit is above the pressure you want to set – but not unnecessarily high, as the pressure can be set more finely in a smaller range. For 10 bar, the 0.5–12 bar range is suitable; for 16 bar, 1–20 bar; for 30 bar, 2–35 bar; and for 40 bar, 3–50 bar.
2. Size according to air consumption. Add up the air consumption of the machines and equipment downstream of the regulator. BG 30 handles 2,175 l/min with a G 1/4" connection and 2,718 l/min with G 3/8", BG 60 with a G 1" connection 5,437 l/min.
3. Thread according to the pipework. The G 1/4" version has the same body as G 3/8", only with reducers at the inlet and outlet. If the pipework allows it, choose G 3/8" – more air flows through it.

Example: test equipment for pressure tests needs 30 bar and consumes up to 1,500 l/min, with 40 bar coming from a high-pressure compressor. Size BG 30 with the 2–35 bar range is sufficient; with a G 3/8" connection, this is 302.335.

Not sure which regulator to choose? Try the pressure regulator selector – based on line pressure, required pressure and flow.

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How a piston regulator with secondary venting works

1. With the adjusting screw with handle you compress the spring. The spring presses on the piston, which opens the valve – air flows from the inlet to the outlet.
2. The outlet pressure acts on the piston against the spring. When it reaches the set value, the valve partially closes and only as much air flows through as is being consumed.
3. Pressure fluctuations in the network show only slightly at the outlet – according to the manufacturer, the outlet pressure is largely independent of the inlet pressure.
4. When you reduce the set pressure or the outlet pressure rises, the piston opens the vent hole and the excess air escapes.

Dimensions

Dimensions according to the manufacturer’s catalogue. BG 30 measures 72 × 102 × 168 mm, BG 60 118 × 138 × 257 mm (length × width with pressure gauge × height with handle). You will find the drawings for the individual threads on the page of each regulator.

Installation and adjustment

• install a high-pressure compressed air filter rated for the network pressure upstream of the regulator – dirt from the pipework would damage the valve seat
• install the regulator so that the air flows in the direction of the arrow on the body; any mounting position is possible
• the pressure gauge is supplied loose – screw it in at the front or the back, depending on where you will read it from
• set the pressure from below: loosen the adjusting screw to below the required value, then tighten it until the pressure gauge shows the required pressure
• for the G 1/4" version, the reducers from G 3/8" are supplied – screw them into the inlet and outlet and seal them in the same way as the pipework
• the regulator is fixed to a wall or frame with a mounting bracket on the cover; size BG 30 can also be mounted in a control panel with an M28 × 1.5 panel nut

Both the bracket and the panel nut are fixed by the thread on the spring housing. In a panel: the nut clamps the regulator in the panel opening (A). On a wall or frame: the nut on the same thread clamps the bracket, which is then screwed on (B).

Parts by size: BG 30 (G 1/4", G 3/8") – bracket BW3040 and nut SM3040 (M28 × 1.5), BG 60 (G 1") – bracket BW5560; it is not mounted in a panel.

Spare parts and accessories

The valve cone in the regulator wears over time – replace it and the regulator will keep on working. Add a mounting bracket when you mount the regulator on a wall or frame, and a panel nut when you mount it in a panel.

Spare pressure gauge ⌀ 63 mm according to the control range: 0.5–12 bar → 215, 1–20 bar → 216, 2–35 bar → 217, 3–50 bar → 218.

You will find all parts for the regulators in the category spare parts and accessories for pressure regulators.

Series specifications

What is the difference between sizes BG 30 and BG 60?

The body size. BG 30 has a G 1/4" or G 3/8" connection and a flow rate of up to 2,718 l/min, BG 60 has a G 1" connection and a flow rate of 5,437 l/min. BG 60 is considerably larger and heavier – 6.71–7.3 kg compared with 1.55 kg.

What is secondary venting?

The regulator can release air from the outlet by itself. When you reduce the set pressure, the excess air escapes through the vent hole and the pressure drops immediately, not only once air is consumed. A short hiss when reducing the pressure is therefore normal.

Which control range should I choose?

One whose upper limit is above the required pressure: 0.5–12 bar for 10 bar, 1–20 bar for 16 bar, 2–35 bar for 30 bar, 3–50 bar for 40 bar. The lower limit of the range is the lowest pressure that can be set.

Is the pressure gauge included?

Yes. The ⌀ 63 mm pressure gauge has a range to match the control range: 0–16 bar for 0.5–12 bar, 0–25 bar for 1–20 bar, 0–40 bar for 2–35 bar and 0–60 bar for 3–50 bar. It is supplied loose; you screw it in at the front or the back.

Why does the G 1/4" regulator have a lower flow rate than the G 3/8" one?

Both have the same BG 30 body, but the G 1/4" version has reducers at the inlet and outlet. The manufacturer states a flow rate of 2,175 l/min for it and 2,718 l/min for G 3/8".

What if I have more than 60 bar in the air network?

Then you need a regulator for a higher inlet pressure – the 120 series withstands up to 200 bar at the inlet and delivers up to 150 bar at the outlet.

Can I use the regulator for a gas other than air?

The manufacturer specifies it for compressed air and neutral, non-toxic gases. For any other gas, please ask us before ordering.

Technical data according to the manufacturer EWO. Flow rate measured at an inlet pressure of 20 bar, an outlet pressure of 10 bar and a pressure drop of 4 bar.

You will find more regulators in the category air pressure regulators.