Model DA4

Description

Model DA4 is high performance, pressure loaded diaphragm-type, flow-to-open pressure reducing regulator. Design includes an internal pressure balancing pistoncylinder that provides high flow capacity and high pressure drop capability. The internal trim design allows the same basic unit to cover a broad range of pressure settings. Performance meets or exceeds that of competitive pressure loaded or pilot-operated designs. The DA4 regulator is applied primarily in clean gaseous service, but may also be applied as a liquid or steam valve. Truly a “DO-ALL” pressure regulator.

Inlet Design Pressure

• Up to 3705 psig (255 Barg)

Outlet Pressure

• 1/2" – 1" (DN15–25) ...2.0" WC – 1500 psig (103 Barg)
• 1-1/4" – 2" (DN32–50) ..2.0" WC – 1250 psig (86.1 Barg)
• 2-1/2" – 4" (DN65–100) .2.0" WC – 600 psig (55.2 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

• Standard: Female NPT (screwed)
• ASME Flanged: 125#, 150#, 250#, 300#, 600#
• DIN Flanged: PN16, PN25, PN40
  • (Integral Flanged Body unless listed under Opt.-30)
• Opt-31: British Standard Pipe Threads
• Opt-32: Schedule 80 Extended Pipe Nipples
• Opt-34: 14" Face to Face Flange Dimension
• Opt-41: Extension Tube Ends

Material Combinations: Body / Spring Chamber

• DI/DI
• SST/DI
• HC/SST *
• CS/DI
• SST/CS
• Dup SST/CS
• CS/CS
• SST/SST
• Dup SST/SST
• BRZ/BRZ
• HC/CS *
• Dup SST/DupSST
• BRZ/DI

* Through 2" (DN50) body size only
DI = Ductile Iron
CS = Carbon Steel
BRZ = Bronze
SST = Stainless Steel
HC = Hastelloy "C"
Dup SST= Super Duplex SST

Features

• Versatile: Five basic materials and multiple trim material combinations to select from. Multiple methods of pressure loading.
• 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 majority of applications.
• Droop: Highly accurate outlet pressure control, due to absence of range spring in design, provides almost zero “droop effect”.
• Pressure Drop: One of 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 and metallic diaphragms and soft seats. Can be as high as 2000:1.
• Heavy-Duty Guiding: Both top and bottom guided to maintain stability and increased diaphragm life.
• Failure Position: Fails closed on loss of loading pressure. Fails open on loss of P1 or P2 pressures with loading pressure yet applied.