Air pressure regulators 280 and 406 with inlet up to 25 bar
Pressure regulators of the 280 and 406 series by EWO reduce the pressure of compressed air from the air network or air receiver – up to 25 bar – to the working pressure required by the machine, tool or measuring instrument. They keep the set pressure constant even when the network pressure fluctuates and air consumption changes.
They are diaphragm 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. A ⌀ 63 mm pressure gauge is included. Three body sizes cover flow rates from 2,175 to 5,330 l/min and threads from G 1/8" to G 1".
What the 280 and 406 regulators offer
- secondary venting – you can reduce the outlet pressure even with no air being consumed
- the outlet barely moves when the network pressure changes (inlet pressure influence below 2 %)
- ⌀ 63 mm pressure gauge included, front or rear mounting
- control ranges 0.5–3, 0.5–6, 0.5–10 and 0.5–16 bar
- fine pressure adjustment with the T-handle
- any mounting position, air flows in the direction of the arrow
- for compressed air as well as neutral and non-toxic gases
- die-cast zinc body, NBR diaphragm and seals, operation from −10 to +90 °C
Three body sizes
The body size determines the flow rate. Within one size, all threads have the same flow rate – the smaller threads simply have a reduced inlet and outlet.
| Size | Codes | Threads | Flow rate | Nominal size | Inlet pressure influence | Dimensions | Weight |
|---|---|---|---|---|---|---|---|
| BG 35 | 280.3… | G 1/8"*, G 1/4"*, G 3/8" | 2,175 l/min | DN 10 | < 2 % | 77 / 70 × 160 mm | 1.1–1.22 kg |
| BG 40 | 280.3… | G 3/8"*, G 1/2" | 2,903 l/min | DN 15 | < 2 % | 90 / 82 × 170 mm | 1.37–1.44 kg |
| BG 55 | 406.3… | G 3/4"*, G 1" | 5,330 l/min | DN 20 | < 3 % | 96 / 90 × 186 mm | 1.98–2.13 kg |
* reduced connection · Flow rate according to the manufacturer at an inlet pressure of 8 bar, an outlet pressure of 6 bar and a pressure drop of 1 bar. Dimensions: width × overall height including the T-handle.
All regulators with inlet up to 25 bar
| Code | Size | Thread | Control range | Flow rate | Pressure gauge | Weight |
|---|---|---|---|---|---|---|
| 280.312 | BG 35 | G 1/8"* | 0.5–6 bar | 2,175 l/min | 0–10 bar | 1.22 kg |
| 280.313 | BG 35 | G 1/8"* | 0.5–10 bar | 2,175 l/min | 0–16 bar | 1.16 kg |
| 280.314 | BG 35 | G 1/8"* | 0.5–16 bar | 2,175 l/min | 0–25 bar | 1.15 kg |
| 280.321 | BG 35 | G 1/4"* | 0.5–3 bar | 2,175 l/min | 0–6 bar | 1.22 kg |
| 280.322 | BG 35 | G 1/4"* | 0.5–6 bar | 2,175 l/min | 0–10 bar | 1.22 kg |
| 280.323 | BG 35 | G 1/4"* | 0.5–10 bar | 2,175 l/min | 0–16 bar | 1.15 kg |
| 280.324 | BG 35 | G 1/4"* | 0.5–16 bar | 2,175 l/min | 0–25 bar | 1.22 kg |
| 280.331 | BG 35 | G 3/8" | 0.5–3 bar | 2,175 l/min | 0–6 bar | 1.17 kg |
| 280.332 | BG 35 | G 3/8" | 0.5–6 bar | 2,175 l/min | 0–10 bar | 1.17 kg |
| 280.333 | BG 35 | G 3/8" | 0.5–10 bar | 2,175 l/min | 0–16 bar | 1.13 kg |
| 280.334 | BG 35 | G 3/8" | 0.5–16 bar | 2,175 l/min | 0–25 bar | 1.1 kg |
| 280.351 | BG 40 | G 3/8"* | 0.5–3 bar | 2,903 l/min | 0–6 bar | 1.42 kg |
| 280.352 | BG 40 | G 3/8"* | 0.5–6 bar | 2,903 l/min | 0–10 bar | 1.42 kg |
| 280.353 | BG 40 | G 3/8"* | 0.5–10 bar | 2,903 l/min | 0–16 bar | 1.43 kg |
| 280.354 | BG 40 | G 3/8"* | 0.5–16 bar | 2,903 l/min | 0–25 bar | 1.42 kg |
| 280.361 | BG 40 | G 1/2" | 0.5–3 bar | 2,903 l/min | 0–6 bar | 1.37 kg |
| 280.362 | BG 40 | G 1/2" | 0.5–6 bar | 2,903 l/min | 0–10 bar | 1.39 kg |
| 280.363 | BG 40 | G 1/2" | 0.5–10 bar | 2,903 l/min | 0–16 bar | 1.44 kg |
| 280.364 | BG 40 | G 1/2" | 0.5–16 bar | 2,903 l/min | 0–25 bar | 1.38 kg |
| 406.383 | BG 55 | G 3/4"* | 0.5–10 bar | 5,330 l/min | 0–16 bar | 1.98 kg |
| 406.384 | BG 55 | G 3/4"* | 0.5–16 bar | 5,330 l/min | 0–25 bar | 2.13 kg |
| 406.391 | BG 55 | G 1" | 0.5–3 bar | 5,330 l/min | 0–6 bar | 2.08 kg |
| 406.392 | BG 55 | G 1" | 0.5–6 bar | 5,330 l/min | 0–10 bar | 2.05 kg |
| 406.393 | BG 55 | G 1" | 0.5–10 bar | 5,330 l/min | 0–16 bar | 2.0 kg |
| 406.394 | BG 55 | G 1" | 0.5–16 bar | 5,330 l/min | 0–25 bar | 2.1 kg |
How to choose a regulator
- 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 6 bar, the 0.5–10 bar range is suitable; for 2 bar, the 0.5–3 bar range.
- Size according to air consumption. Add up the air consumption of the machines and tools downstream of the regulator. BG 35 handles 2,175 l/min, BG 40 2,903 l/min and BG 55 5,330 l/min. At a lower network pressure, less air flows through – in that case choose a larger size.
- Thread according to the pipework. The flow rate does not depend on the thread. The smaller threads in a given size (G 1/8" and 1/4" for BG 35, G 3/8" for BG 40, G 3/4" for BG 55) have a reduced inlet and outlet on the same body.
Example: pneumatic tools for 6 bar with an air consumption of 1,200 l/min, with 10 bar in the air network. Size BG 35 with the 0.5–10 bar range is sufficient; with a G 1/4" connection, this is 280.323.
Not sure which regulator to choose? Try the pressure regulator selector – based on line pressure, required pressure and flow.
#showmore#
How a regulator with secondary venting works
- With the T-handle you tension the spring. The spring presses on the diaphragm, which opens the valve – air flows from the inlet to the outlet.
- The outlet pressure pushes on the diaphragm against the spring. When it reaches the set value, the valve partially closes and only as much air flows through as is being consumed.
- The outlet reacts only very slightly to pressure fluctuations in the network: less than 2 % of a change in inlet pressure shows at the outlet (less than 3 % for BG 55).
- When you reduce the set pressure or the outlet pressure rises, the diaphragm opens the vent hole and the excess air escapes. The difference between the valve closing and the start of venting is about 1 bar.
Flow curves
The manufacturer’s graphs show how the outlet pressure drops as the flow rate increases. Each line starts at a set pressure of 2, 4, 6, 8 and 10 bar; the inlet pressure is always 2 bar higher than the outlet pressure. The flatter the line, the more stable the pressure at high air consumption.
Dimensions
Dimensional drawings of sizes BG 40 and BG 55 from the manufacturer’s catalogue, dimensions in mm (width × overall height including the T-handle). The drawing of size BG 35 is above, next to the description of how the regulator works.
Installation and adjustment
- install a compressed air filter 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 T-handle to below the required value, then tighten it until the pressure gauge shows the required pressure
- for panel mounting, the regulator is fixed by the thread on the spring housing (M20 × 1.5 for BG 35, M22 × 1 for BG 40, M28 × 1.5 for BG 55)
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 35 – bracket 280-134 and nut 323-66 (M20 × 1.5), BG 40 – bracket 280-132 and nut 280-133 (M22 × 1), BG 55 – bracket 406-17 and nut 406-18 (M28 × 1.5).
Spare parts and accessories
The diaphragm and the valve cone wear over time – replace them and the regulator will keep on working. Add a bracket and a panel nut when you mount the regulator on a wall or in a panel.
Spare pressure gauge ⌀ 63 mm according to the control range: 0.5–3 bar → 213, 0.5–6 bar → 214, 0.5–10 bar → 215, 0.5–16 bar → 216.
You will find all parts for the regulators in the category spare parts and accessories for pressure regulators.
Series specifications
| Parameter | Value |
|---|---|
| Inlet pressure | max. 25 bar (PN 25) |
| Control ranges | 0.5–3 / 0.5–6 / 0.5–10 / 0.5–16 bar |
| Flow rate | 2,175 / 2,903 / 5,330 l/min (BG 35 / BG 40 / BG 55) |
| Nominal size | DN 10 / DN 15 / DN 20 |
| Inlet pressure influence | < 2 % (BG 35 and 40), < 3 % (BG 55) |
| Secondary venting | yes, hysteresis approx. 1 bar |
| Pressure gauge | ⌀ 63 mm, range 0–6 to 0–25 bar depending on the control range, included |
| Adjustment | T-handle |
| Mounting position | any, flow in the direction of the arrow |
| Operating temperature | −10 to +90 °C |
| Medium | compressed air, neutral and non-toxic gases |
| Material | die-cast zinc body and spring housing, NBR diaphragm and seals |
Ventilek advises
Install the regulator downstream of the filter and as close to the point of use as possible. The pressure gauge then shows the pressure the machine really receives.
- higher network pressure: regulators 286 with inlet up to 40 bar or regulators 302 up to 60 bar
- high flow rate: regulators 417 up to 25,000 l/min
- very precise control: FDR regulators
- 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. For 6 bar, the 0.5–10 bar range is suitable. A range that is too large (for example 0.5–16 bar for 2 bar) only allows coarse adjustment.
- Is the pressure gauge included?
- Yes. The ⌀ 63 mm pressure gauge has a range to match the control range: 0–6 bar for 0.5–3 bar, 0–10 bar for 0.5–6 bar, 0–16 bar for 0.5–10 bar and 0–25 bar for 0.5–16 bar. It is supplied loose; you screw it in at the front or the back.
- Why does the G 1/4" regulator have the same flow rate as the G 3/8" one?
- Both have the same body of size BG 35. The G 1/8" and G 1/4" versions only have a reduced inlet and outlet. The flow rate is determined by the body size, not by the thread.
- What if I have more than 25 bar in the air network?
- Then you need a regulator for a higher inlet pressure – the 286 series up to 40 bar or the 302 series up to 60 bar.
- 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 8 bar, an outlet pressure of 6 bar and a pressure drop of 1 bar.
You will find more regulators in the category air pressure regulators.
Product sorting
List of products
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1/2"control range 0.5–16 bar, inlet pressure up to 25 barflow rate...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1/4" (reduced inlet and outlet)control range 0.5–16 bar, inlet pressure...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1"control range 0.5–16 bar, inlet pressure up to 25 barflow rate 5,330...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1/4" (reduced inlet and outlet)control range 0.5–10 bar, inlet pressure...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 3/4" (reduced inlet and outlet)control range 0.5–16 bar, inlet pressure...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 3/4" (reduced inlet and outlet)control range 0.5–10 bar, inlet pressure...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1"control range 0.5–6 bar, inlet pressure up to 25 barflow rate 5,330...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1"control range 0.5–10 bar, inlet pressure up to 25 barflow rate 5,330...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 3/8"control range 0.5–16 bar, inlet pressure up to 25 barflow rate...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 3/8" (reduced inlet and outlet)control range 0.5–16 bar, inlet pressure...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1/4" (reduced inlet and outlet)control range 0.5–6 bar, inlet pressure...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1/8" (reduced inlet and outlet)control range 0.5–16 bar, inlet pressure...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1/2"control range 0.5–3 bar, inlet pressure up to 25 barflow rate 2,903...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 3/8"control range 0.5–3 bar, inlet pressure up to 25 barflow rate 2,175...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 3/8" (reduced inlet and outlet)control range 0.5–3 bar, inlet pressure...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1/4" (reduced inlet and outlet)control range 0.5–3 bar, inlet pressure...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 3/8"control range 0.5–10 bar, inlet pressure up to 25 barflow rate...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 3/8" (reduced inlet and outlet)control range 0.5–10 bar, inlet pressure...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1"control range 0.5–3 bar, inlet pressure up to 25 barflow rate 5,330...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1/2"control range 0.5–10 bar, inlet pressure up to 25 barflow rate...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1/2"control range 0.5–6 bar, inlet pressure up to 25 barflow rate 2,903...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1/8" (reduced inlet and outlet)control range 0.5–10 bar, inlet pressure...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 1/8" (reduced inlet and outlet)control range 0.5–6 bar, inlet pressure...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 3/8"control range 0.5–6 bar, inlet pressure up to 25 barflow rate 2,175...
EWO diaphragm pressure regulator with secondary venting for compressed air and neutral gases.connection G 3/8" (reduced inlet and outlet)control range 0.5–6 bar, inlet pressure...