Model 4000ABP Back Pressure Regulator

Enquire about this product:

The Fairchild 4000ABP Pneumatic Precision Regulator is a no bleed design regulator that precisely controls a set pressure. With a control sensitivity of 1/2" water column, it allows use in precision applications.


  • Large Relief Valve provides high exhaust flows
  • An Aspirator Tube compensates upstream pressure build up under flow conditions.
  • A separate Control Chamber isolates the diaphragm from the main flow to eliminate hunting and buzzing.
  • Unit construction lets you service the Fairchild 4000ABP without removing it from the line.

Operating Principles

The Fairchild 4000ABP Regulator uses the force balance principle to open the Relief Valve and vent system pressure when the set point is exceeded.
Upstream pressure is transmitted through the Aspirator Tube to the bottom of the Diaphragm Assembly. When you adjust the range screw for a specific set point, the Range Spring compresses and exerts a force on the top of the Diaphragm Assembly. As long as the pressure acting on the bottom of the Diaphragm Assembly produces a force less than the spring force acting on the top of the Diaphragm Assembly, the Relief Valve remains closed. When system pressure inreases, the force on the bottom of the Diaphragm Assembly increases until it reaches the set point. When system pressure increases beyond the set point, the assembly moved upward, lifting the Relief Valve from its seat and vents the downstream air.
If downstream pressure decreases below the set point, the assembly moves downward closing the Relief Valve.

Catalogue PDF: application/pdf
Located in: Regulators

Latest News

FIPA presents: Oval vacuum cups

Introducing the newly developed oval vacuum cups series.

The vacuum cups are characterised by a very long cycle life, which has also been successfully demonstrated against vacuum cups of competitors in practical operation. The long service life is enabled by means of a new high wear- and oil-resistant NBR material and a special vacuum suction cup construction which minimises the load on the vacuum cup during handling.


FIPA presents: New ID grippers for parts with different diameters

Flexible and service friendly

The pneumatically operated, single-acting ID grippers from FIPA GmbH have already established themselves as the alternative for workpieces with holes or cut-outs or for when vacuum cups or grippers aren’t just right for handling goods. FIPA has completely overhauled its portfolio and now offers users maximum flexibility with minimal set-up time.

The small ID grippers are now equipped with food-safe gripper heads made of polyamide (PA) and are suitable for light and small parts with openings measuring 3 to 10 millimeters in size. If necessary, the gripper heads can be easily exchanged in a non-destructive manner.