Description
SMC AR30K-03BG-D — AR-D series modular regulator, 3/8" port, with a built-in check valve that lets downstream air escape when the supply is cut (reverse flow function). The D series is the current generation, replacing the discontinued AR(K)-B.
Specification — AR30K-03BG-D
| Series |
AR20(K)-D to AR60(K)-D (modular regulator, reverse flow) |
| Body size |
30 |
| Port size |
3/8" |
| Function |
Reverse flow (built-in check valve) |
| Gauge |
Round pressure gauge (G), bracket (B) |
| Fluid |
Air |
| Product weight |
270 g |
Features of the D series
- Reshaped handle — easier to grip when releasing the lock
- Choice of gauge: square embedded gauge, round gauge, or digital pressure switch
- Panel mount compatible with the earlier AR(K)-B series; brackets and set nuts are common to both generations
What the reverse flow function does
A standard regulator holds pressure downstream even after the supply is shut off. The K version carries a check valve that lets that trapped air escape back through the regulator, so the downstream side drops to zero as soon as the supply is cut. It matters wherever a cylinder or clamp must not stay pressurised after shutdown.
Replacing an AR(K)-B unit
The D series is the direct successor to the AR(K)-B, which SMC discontinued in March 2025. Panel mounting, brackets and set nuts carry over, so an existing installation usually takes the new unit without rework. Tell us the old code and we will confirm the matching D specification.
Ordering
Order by the full code AR30K-03BG-D. The K marks the reverse flow function, 03 the port size, and BG the bracket and gauge options — one character changes the part. The 20 and 40 body sizes are available in the same configuration.
Supply from Korea
Genuine SMC, stocked and shipped from Gyeonggi-do, Korea, with export packing and commercial documents prepared as standard.
