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All Categories > Regulators (Water, Steam, Air) > Main Valves > Type E8 Main Valve  

Type E8 Main Valve

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Air Loaded
  • Normally Closed
  • Single Seat
  • Balanced Metal Diaphragms
  • ANSI/FCI 70-2 Class IV Shutoff
  • No Minimum Operating Differential Pressure
  • Packless Construction
  • No Pilot Needed
  • Maximum 50 PSI Air Delivery Pressure
  • Permits Remote Operation and Control
  • Economical Alternative to Control Valve
Typical Configurations
  • Pressure Reducing - Type E8 65A
  • Pressure Reducing - Type E8 A Panel
  • Pressure Reducing - Type E8 B Panel
  • Pressure Reducing - Type E8EPC
  • Temperature Control - TypeE8T61
  • Temperature Control - Type E8EPC
Applicable Data
  • Pressure Regulating for Steam Distribution
  • Regulating for Process Control (Temperature or Pressure)
  • Maintain Back Pressure or Differential Pressure
  • To use Air Load Pressure to Control Delivery Pressure
  • Single Point or Multiple Use Applications
  • Slow Start-up or Shutdown
  • Use where "Dirty Steam" Conditions Exist
The valve shall be air operated, single seated, metal diaphragm actuated, normally closed design. The valve will function quickly and shut tight on dead end service. Internal parts including seats, discs, stems and diaphragms shall be of stainless steel. There shall be no springs in the steam space and no stuffing box. The valve shall be easy to maintain with all parts accessible without removal from the line.



3/8 to 12 in

Pressure at 406ºF

250 psig

Body Material

Cast Iron - ASTM A126 Cl. B

Stem Material

303 Stainless Steel ASTM A582

Disc Material

3/4 - 5" - 420 Stainless Steel ASTM A743 CA-40
6 - 12" - 304 Stainless Steel ASTM A167/A240

Seat Material

3/4 - 5" - 420 Stainless Steel ASTM A743 CA-40
6 - 12" - 316 Stainless Steel ASTM A743-79 CF-8M

Gasket Material


Diaphragm Material

Stainless Steel MIL-S-5059C

Spring Material



Composition Disc
Balanced Construction

Insulcap Insulating Jacket

Parabolic Disc


EZ Connections


·  Valve Rating (Type E8 Main Valve)

·  Dimensions & Weight (Type E8 Main Valve)

·  Rated Flow Coefficients (Type E8 Main Valve)


Main Valve Options
(PDF, 192KB)

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