Parker Precision Pneumatic Input Signal Amplifiers | P3BA208 Series

The P3BA208 Precision Pneumatic Input Signal Amplifier is a pneumatic device capable of high flow and exhaust capacity. The device uses a force balance system to control the movement of the supply and exhaust valves.


  • 1/4" ports (NPT, BSPP)
  • Pneumatic input signal for accurately controlling output pressure based on a predetermined ratio
  • Balanced supply valve minimizes the effects of supply pressure variation
  • Optional adjustable by-pass valve (1:1 ratio only) allows tuning for optimum dynamic response
  • Optional fixed negative bias allows operation with pneumatic devices that cannot be adjusted to zero input pressure

Back to Precision Regulators Main Page

Part Numbers

Part Number*  Description

Port Size


Height (E)

mm (in)

Width (A)

mm (in)


1:1 pilot ratio

1/4" 45 (w/ 100 psig supply)
98.3 (3.88) 76.2 (3.00)

1:2 pilot ratio

1/4" 45 (w/ 100 psig supply) 98.3 (3.88) 76.2 (3.00)

1:3 pilot ratio

1/4" 45 (w/ 100 psig supply) 98.3 (3.88) 76.2 (3.00)

*For BSPP ports, add an "H" to the end of the part number. For tapped exhaust option, add an "E" to the end of the part number. For by-pass valve, add "I" to the end of the part number.


Service Kits and Accessories

Part Number Description
PS19513-11 Service kit - 1:1 ratio
PS19513-11I Service kit - 1:1 ratio with bypass valve
PS19513-12 Service kit - 1:2 ratio
PS19513-13 Service kit - 1:3 ratio
PS09921 Mounting bracket kit

Technical Specifications


Flow Capacity: 45 scfm (w/ 100 psig supply)
Maximum Supply Pressure: 250 psig (17 bar)
Maximum Output Pressure: 150 psig (10 bar)

.250" water column - 1:1 ratio

.500" water column - 1:2 ratio

.750" water column - 1:3 ratio

Ambient Temperature: -40°F to 200°F
Port Size: 1/4" (NPT, BSPP)

Warning Triangle WARNING: These products can expose you to chemicals including lead and/or DEHP and/or carbon black, which are known to the State of California to cause cancer or birth defects or other reproductive harm.  For more information go to

Parker Air Preparation

Global Air Prep
  • Modular design allows for quick component change - no need to disconnect piping
  • Can be used without modular connectors using existing piping
Prep-Air II
  • Wide selection of sizes and options
  • Proven design, widely used

Stainless Steel FRLs

  • Suitable for most corrosive environments

Precision Regulators

  • Flows to 150 SFFM
  • Pressures to 500 PSIG

Electronic Proportional Regulators

  • All controls on the same face
  • Highly visible LED Display
  • Modular Mounting