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SMC 21-ARP20-01B-1R precision regulator, ARP PRECISION REGULATOR
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-ARP20-01B-1R.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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https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/21-ARP20-01B-1R

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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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