M4000A0 pages
Model 4000A Pneumatic Pressure Regulator
nnnnModel
nnnn4000A
nnnnThe Model 4000A Pneumatic Precision
nnnnRegulator is a no bleed design regulator
nnnnthat precisely controls a set pressure.
nnnnFeatures
nnnn• Control sensitivity of 1/2" water column
nnnnallows use in precision applications.
nnnn• Large Supply and Exhaust Valves provide
nnnnhigh forward and exhaust flows.
nnnn* Soft Supply and Exhaust Valve seats
nnnnminimize air consumption.
nnnn■ A balanced Supply Valve minimizes the
nnnneffect of supply pressure variation.
nnnn■ An Aspirator Tube compensates
nnnndownstream pressure droop under flow
nnnnconditions.
nnnn■ A separate Control Chamber isolates the
nnnndiaphragm from the main flow to eliminate
nnnnhunting and buzzing.
nnnn* Unit construction lets you service the Model
nnnn4000A without removing it from the line.
nnnn• Canadian Registration Number (CRN)
nnnncertification for all territories and provinces.
nnnnOperating Principles
nnnnWhen you adjust the Range Screw to a
nnnnspecific setpoint the Range Spring exerts a
nnnndownward force against the top of the
nnnnControl Diaphragm. This downward force
nnnnopens the Supply Valve. Output pressure
nnnnflows through the Outlet Port and the
nnnnAspirator Tube to the Control Chamber
nnnnwhere it creates an upward force on the
nnnnbottom of the Control Diaphragm.
nnnnWhen the setpoint is reached, the force of
nnnnthe Range Spring that acts on the top of the
nnnnControl Diaphragm balances with the force
nnnnof output pressure that acts on the bottom
nnnnof the Control Diaphragm and closes the
nnnnSupply Valve.
nnnnWhen the output pressure increases above
nnnnthe setpoint, the Diaphragm Assembly
nnnnmoves upward to close the Supply Valve
nnnnand open the Exhaust Valve. Because the
nnnnPoppet Valve is closed, pressure flows
nnnndown the Connecting Tube to the bottom of
nnnnthe Motor Diaphragm. This pressure keeps
nnnnthe Supply Valve tightly closed while in the
nnnnexhaust mode, The Poppet Valve opens
nnnnand output pressure exhausts through the
nnnnVent on the side of the unit until it reaches
nnnnthe setpoint.
nnnnRange
nnnnScrew
nnnnRange
nnnnSpring
nnnnPoppet
nnnnValve
nnnnControl
nnnniaphragm
nnnnExhaust
nnnnValve
nnnnConnecting
nnnnTube
nnnnOutlet Port
nnnnAspirator
nnnnTube
nnnnSupply
nnnn'' live
nnnnValve
nnnnMotor
nnnnDiaphragm
nnnn4 1/2
nnnn114.3
nnnn63/64 i
nnnn21/4
nnnn57.?
nnnn■ MA
nnnnJ Fu
nnnn1/4-20 x.50 Deep
nnnn■ - Thread [2)
nnnnMounting Holes
nnnn1/4 NPT
nnnnGage Ports (2)
nnnn(typical)
nnnnTamper Proof
nnnn#77 800-334-8422
nnnn^A#CTO#-#fl_D itf www.fairchildproducts.com
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