Alternative Fuels




Relief Valves

Circle Seal Controls - 8100 Series Pressure Relief Devices (PRD)

Circle Seal Controls 8100 Series Pressure Relief Device

State-of-the-art design, offering unexcelled safety performance

Features

  • Zero Leakage
  • No Fusible Material For Sealing
  • Extremely Stable
  • Meets PRD-1 Standard
  • Wide variety of end connections including Gyrolok®
  • Stable and consistent relief at 219° F (104° C)

Applications

  • Thermal relief
  • Quick dumping of tank pressure
  • CNG, LNG, N2, H2, Air and other gas applications up to 5000 psig (345 bar)

Specifications:

  • Operating Pressure: 0–5,000 psig (0–345 bar)
  • Proof Pressure: 7,500 psig (516 bar)
  • Operating Temperature: −65° F to +250° F (−54° C to +121° C)
  • Nickel-plated brass (standard) or 316 stainless steel

Circle Seal Controls - RV99-700 Series Pressure Relief Device

Circle Seal Controls RV99-700 Series Pressure Relief Device

Applications include thermal relief for GH2 fuel systems and tanks, and for on-vehicle and filling station operations.

  • PRD-1 compliant 700 bar PRD
  • Bubble tight leakage less than 10ncc/hour
  • Eutectic material for activation only

Specifications

  • Operating Pressure: 10,150 psi (700 bar)
  • Proof pressure: 15,000 psi (1034 bar)
  • Operating temperature range −65° F to +275° F (−54° C to +135° C)
  • Activation temperature 219° F (104° C)
  • Flow: 90SCFM of air at 100 psid
  • Materials of construction: 316 SS, Buna-N seals, Teflon® backup rings

Circle Seal Controls/Hoke - R6000 Series Relief Valves

Circle Seal/Hoke R6000 Series Relief Valves

Adjustable relief valves with extremely stable crack and reseal pressure ranges, assuring safe, reliable over pressure protection for your system.

Features

  • Externally adjusted right angle design
  • Pressure relief up to 6000 psig (414 bar)
  • Raised seal lip for bubble tight sealing
  • Cracking pressure remains constant even with changes in downstream pressure
  • Valve pressures can be factory preset and lock wired according to customer specifications
  • Delta stem seal in high pressure models reduces stem leakage, enhancing the performance of the spring and valve.
  • All valves are CE 0035 / PED approved

Applications

  • Safe and consistent overpressure protection for liquids and gases

Specifications

  • Cracking Pressure: 5–6000 psig (0–414 bar)
  • Maximum Operating Pressure: 5–7000 psig (0–482 bar)
  • Proof Pressure: 1050 and 9000 psig (72 and 620 bar)
  • Burst Pressure: over 24,000 psig except LR series (2800 psig)
  • 316 stainless steel body
  • Orifice sizes: 0.188″, 0.082″, 0.094″


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