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Model DA8

Back Pressure Regulator

SKU#:

Model DA8

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Overview

The Model DA8 is a differential back pressure regulators used to maintain a constant pressure differential between a fluid loading pressure (PLOAD) piped to the spring chamber and the regulator’s inlet pressure (P1). In the Model DA8 the P1 pressure is higher than the PLOAD (Positive Bias). The amount of bias or differential pressure (∆PDiff) is controlled by the user adjustable setting of the range spring in the spring chamber.

The regulator uses a flow-to-open, cage balanced trim. The diaphragm is isolated from the fluid flow path by a balancing piston, which allows the user to specify either internal or external sensing of the P1 pressure.

 

   

 

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Description

The Model DA8 is a differential back pressure regulators used to maintain a constant pressure differential between a fluid loading pressure (PLOAD) piped to the spring chamber and the regulator’s inlet pressure (P1). In the Model DA8 the P1 pressure is higher than the PLOAD (Positive Bias). The amount of bias or differential pressure (∆PDiff) is controlled by the user adjustable setting of the range spring in the spring chamber.

The regulator uses a flow-to-open, cage balanced trim. The diaphragm is isolated from the fluid flow path by a balancing piston, which allows the user to specify either internal or external sensing of the P1 pressure.

Inlet Design Pressure

  • Up to 300 psig (20.7 Barg)

Outlet Pressure

  • 1 psig (0.07 Barg) to 200 psig (13.8 Barg)

Line Sizes

  • 1/2" (DN15)
  • 3/4" (DN20)
  • 1" (DN25)
  • 1-1/4" (DN32)
  • 1-1/2" (DN40)
  • 2" (DN50)
  • 2-1/2" (DN65)
  • 3" (DN80)
  • 4" (DN100)
 

End Connections

  • NPT
  • FLANGED
  • BSPT
  • EXTENDED PIPE NIPPLES
  • 14" FACE TO FACE
  • EXTENSION TUBE ENDS

Material Combinations: Body / Spring Chamber

  • DI/DI
  • DI/DI
  • CS/DI
  • CS/CS
  • BRZ/BRZ *
  • BRZ/DI
  • SST/DI
  • SST/CS
  • SST/SST
 

* Through 2" body size only.

DI = Ductile Iron
CS = Carbon Steel
SST = Stainless Steel
BRZ = Bronze

Features

  • Versatile: Four basic materials and multiple trim material combinations to select from.
  • Tight Shutoff: Multiple composition materials provide Class IV or VI inboard leakage rates. Designed as a soft-seated valve.
  • Capacity: Highest in the industry. Allows smaller body sizes than competitors in a majority of applications.
  • Pressure Drop: Highest in the industry when coupled with high flow capacity.
  • Trim Design: "DO-ALL" trim design provides FTO and pressure balancing for higher inlet pressure. Results in unmatched sensitivity and stability. Internals are cage-contained within easily removable quick change trim.
  • Rangeability: Basic valve gives outstanding rangeability due to close tolerances, balanced trim, and a broad range of elastomeric diaphragms and soft seats. Can be as high as 1000:1.
  • Heavy-Duty Guiding: Both top and bottom guided to maintain stability and increased diaphragm life.
  • Failure Position: DA8 fails closed on loss of P1 pressure.
 

 

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