The ARP20/30/40 series is available with a back flow function that exhausts the air pressure in the outlet side reliably and quickly. 

ARX Series

B G P BG GP 1 Specialty Regulators ARX Series Regulator for 290 psi (2 MPa) ARX20, 21 Flow Characteristics ARX20-N02 130.5 ARX20-N01 Conditions: Supply pressure 290 psig 130.5 116 116 101.5 101.5 Secondary pressure (psig) Secondary pressure (psig) 87 87 72.5 72.5 58 58 43.5 43.5 30 30 15 15 0 3.5 7.1 10.6 14.1 17.7 21.2 24.7 28.3 31.8 35.3 0 3.5 7.1 10.6 14.1 17.7 21.2 24.7 28.3 31.8 35.3

Nozzle Diameter: 10 (ø1.0mm), Vacuum Pressure: L (-48 kPa), SUP: N01 (Screw-in NPT 1/8), VAC: N01 (Screw-in NPT 1/8)

Nozzle Diameter: 10 (ø1.0mm), Vacuum Pressure: S (-89 kPa), SUP: N01 (Screw-in NPT 1/8), VAC: N01 (Screw-in NPT 1/8)

Size: 20, Backflow Function: None, Thread: N (NPT), Port Size: 01 (1/8), Accessory: None, Specifications: 1R (1 + R), Pressure Unit: Z (Name plate & Pressure Gauge in Imperial Units: psi)

Size: 20, Backflow Function: None, Thread: N (NPT), Port Size: 01 (1/8), Accessory: None, Specifications: 1Y (1 + Y), Pressure Unit: Z (Name plate & Pressure Gauge in Imperial Units: psi)

Size: 20, Backflow Function: None, Thread: N (NPT), Port Size: 01 (1/8), Accessory: None, Specifications: 1 (0.005 to 0.2 MPa Setting), Pressure Unit: Z (Name plate & Pressure Gauge in Imperial Units: psi)

Size: 20, Backflow Function: None, Thread: N (NPT), Port Size: 01 (1/8), Accessory: None, Specifications: 3Y (3+Y), Pressure Unit: Z (Name plate & Pressure Gauge in Imperial Units: psi)

Size: 20, Backflow Function: None, Thread: N (NPT), Port Size: 01 (1/8), Accessory: None, Specifications: Y (Upward Facing Knob), Pressure Unit: Z (Name plate & Pressure Gauge in Imperial Units: psi)

Size: 20, Backflow Function: None, Thread: N (NPT), Port Size: 01 (1/8), Accessory: None, Specifications: 3R (3 + R), Pressure Unit: Z (Name plate & Pressure Gauge in Imperial Units: psi)

Size: 20, Backflow Function: None, Thread: N (NPT), Port Size: 01 (1/8), Accessory: None, Specifications: 3 (0.008 to 0.6 MPa Setting), Pressure Unit: Z (Name plate & Pressure Gauge in Imperial Units: psi)

Size: 20, Backflow Function: None, Thread: N (NPT), Port Size: 01 (1/8), Accessory: None, Specifications: 1RY (1 + R + Y), Pressure Unit: Z (Name plate & Pressure Gauge in Imperial Units: psi)

Size: 20, Backflow Function: None, Thread: N (NPT), Port Size: 01 (1/8), Accessory: None, Specifications: 3RY (3+R+Y), Pressure Unit: Z (Name plate & Pressure Gauge in Imperial Units: psi)

Size: 20, Backflow Function: None, Thread: NPT, Port Size: 1/8, Accessory: None, Specifications: 1 + R, Pressure Unit: Name plate & Pressure Gauge in Imperial Units: psi

Size: 20, Backflow Function: None, Thread: NPT, Port Size: 1/8, Accessory: None, Specifications: 3+Y, Pressure Unit: Name plate & Pressure Gauge in Imperial Units: psi

Size: 20, Backflow Function: None, Thread: NPT, Port Size: 1/8, Accessory: None, Specifications: Upward Facing Knob, Pressure Unit: Name plate & Pressure Gauge in Imperial Units: psi

Size: 20, Backflow Function: None, Thread: NPT, Port Size: 1/8, Accessory: None, Specifications: 3 + R, Pressure Unit: Name plate & Pressure Gauge in Imperial Units: psi

Size: 20, Backflow Function: None, Thread: NPT, Port Size: 1/8, Accessory: None, Specifications: 1 + R + Y, Pressure Unit: Name plate & Pressure Gauge in Imperial Units: psi

Size: 20, Backflow Function: None, Thread: NPT, Port Size: 1/8, Accessory: None, Specifications: 3+R+Y, Pressure Unit: Name plate & Pressure Gauge in Imperial Units: psi

Regulator, Pressure Boosting Valve: Regulator, Regulator Type: Precision Control, Shape: Standard, Operating Environment: Standard, Compatible Fluid: Air, Exhaust Mechanism (Air Bleed): [Included] Bleed, Reverse Flow Function (Relief): No, Supply Side Connection Type: [NPT] NPT, Supply Side, Connection Diameter: 1/8, Flow Direction: [Right] From Left to Right, Control Side Connection Type