Apollo Valves A108 Series Pressure Relief/Sustaining

A108 Series Pressure Relief/Sustaining Description

The A108 Series Pressure Relief/Pressure Sustaining Automatic Control Valve has a wide range of applications: anywhere a system must be protected from pressures that are too high (relief) or too low (sustaining). The normally closed, spring-loaded pilot, sensing upstream pressure, responds to changes in pressure and causes the main valve to do the same. The net result is a constant modulating action of the pilot and main valve to hold the upstream pressure constant. The pilot system is equipped with a closing speed control that fine tunes the valve response to the system variables. Proudly made in the USA.

Apollo Valves A108 Series Pressure Relief/Sustaining
A108 Series Pressure Relief/Sustaining


  • Relief Valve: Limits Inlet Pressure by Relieving Excess Pressure
  • Pressure Sustaining: Prevents Inlet Pressure from Dropping Below a Predetermined Minimum
  • Operates Over a Wide Flow Range
  • Inlet Pressure is Adjustable with Single Screw
  • Quick Opening and Adjustable Closing Speed
  • Can be Maintained without Removal From the Line
  • Factory Tested and can be Preset to Your Requirements


  • NSF/ANSI 372 Lead Free
  • NSF/ANSI 61 Water Quality: 4” – 24”

Another Article:



  • Screwed Ends: 1-1/4” – 3”
  • Grooved Ends: 1-1/2” – 4”
  • Flanged Ends: 1-1/4” – 24” (Globe) 1-1/4” – 16” (Angle)

Standard Materials List

Body/Bonnet Ductile Iron (epoxy coated), Carbon Steel (epoxy coated), Stainless Steel, Bronze -Others available (consult factory)
Seat Ring Bronze, Stainless Steel
Stem Stainless Steel, Monel
Spring Stainless Steel
Diaphragm Nylon Reinforced Buna-N, Viton, EPDM
Seat Disc Buna-N, Viton, EPDM
Pilot Stainless Steel Other pilot system components: Bronze/Brass -All Stainless Stee
Tubing & Fittings Copper/Brass, Stainless Stee

Ref : www.apollovalves.com

Download Data Sheets : Apollo Valves A108 Series Pressure Relief/Sustaining

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