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SMC 21-ARP20-N01BG-1Z precision regulator, REGULATOR, PRECISION
The ARP20/30/40 series is available with a back flow function that exhausts the air pressure in the outlet side reliably and quickly. 
https://www.smcpneumatics.com/21-ARP20-N01BG-1Z.html
ARP20/30/40, Direct Operated Precision Regulator, Special Applications

The ARP is a modular style, direct operated precision regulator.  A locking adjustment knob allows the pressure to be set, and then locked to prevent accidental setting changes. The ARP20/30/40 series is available with a backflow function that exhausts the air pressure in the outlet side reliably and quickly

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PDF Icon How To Order: Series ARP20 to ARP40 10- 10- 21- 21- Direct฀Operated฀Precision฀Regulator Series ARP20K to ARP40K 10- 10- Direct฀Operated฀Precision 21- 21- Regulator฀with฀Backflow฀Function

https://partbuilder.smcpneumatics.com/hto_pdf/10_ARP.pdf
PDF Icon Catalog: Direct Operated Precision Regulator/Modular Style ARP20 to ARP40 Direct Operated Precision Regulator with Backflow Function/Modular Style ARP20K to ARP40K Regulator JIS symbol Regulator with backflow function

https://www.smcpneumatics.com/pdfs/ARP_3018A.pdf
ARP20/30/40, Direct Operated Precision Regulator, Special Applications

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https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000160692/?Tab=codeList&curSearch={"seriesCode":"332000160692","stockItemFlag":"1"}
PDF Icon ARX Series

Piston assembly Valve Valve spring No. 4 5 6 1348104A 1348105 1348109 SUP OUT 2 ARX Series Specialty Regulators Regulator for 290 psi (2 MPa) ARX20, 21 Dimensions Panel cutout dimensions 1.02 (26) R .1 (2.5) SUP OUT SMC K C O P A A L U S H .5 (12) 1.61, 2.13 [41 (K40)], [49 (K50)] 2.13 (54) .98 (25) 1.6 (max. thickness 4.5) 1.73 (44) .21 (5.4) 3.13 (79.5) (when regulating pressure = 3.23

https://www.smcpneumatics.com/pdfs/smc/70aiarx.pdf
PDF Icon 1

32.5 44.5 6 CJ2 16 12.5 21 33 45 51 75 93 105 6.5 6 12 12 21 25 39 5.5 CM2 D-M9lV 10 13 13 20.5 32.5 44.5 6 16 12.5 12.5 21 33 45 51 75 93 105 6.5 CG1 6 8 17 21 35 1.5 Band mounting D-A9l 10 9 16.5 28.5 40.5 2 MB 16 8.5 17 29 41 47 71 89 101 2.5 6 8 8 17 21 35 1.5 CA2 D-A9lV 10 9 9 16.5 28.5 40.5 2 CQ2 CQS 16 8.5 8.5 17 29 41 47 71 89 101 2.5 6 7.5 16.5 20.5 34.5 1 D-H7l/H7C D-H7lW/

https://www.smcpneumatics.com/pdfs/newproduct1.pdf