Competitive Valve Solutions at the Highest US and
International Quality Standards
HI/LO Ultra High Pressure Cylinder Valve - CGA347 HP Fill Port / CGA346 Regulated Service Port Breathing Air
HI/LO Ultra High Pressure Cylinder Valve - CGA347 HP Fill Port / CGA346 Regulated Service Port Breathing Air
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Double O-Ring Seal Technology for all Industrial and Medical Gases
Robust Forging For Ultra High Pressure

Tapered, NGT Threads for Steel Cylinders
Tapered, 25E Threads for Steel ISO Cylinders

The VHD Series double o-ring ultra high pressure valves are engineered to meet the most demanding applications on cylinder of 3500 to 4500PSI. Designed for use in high capacity 4500PSI cylinders, the Harrison VHD Series incorporates an integral regulator that reduces standard delivery pressure to 700-1000PSI maximum outlet pressure on the standard 3000PSI outlet. This unique product allows for gas companies to deliver higher capacity 4500PSI cylinders to customer locations with common 3000PSI apparatus. All Harrison valves are produced to meet or exceed the highest US and international standards; including ISO 10297 and CGA V-9. Harrison Valves™ are rigorously tested through a robust quality assurance system, and Harrison Valve™ maintains carefully monitored manufacturing processes to ensure that all Harrison valves meet or exceed design and performance specifications.

  • Fill the higher pressure port (347,680 or 701) to 4500PSI, gas service is safely supplied through the (346, 580 or 540) 3000PSI outlet at 700-1000PSI.
  • Double O-ring seal technology provides superior leak integrity at ultra high pressures.
  • Regulator is cycle tested to exceed the life of the typical cylinder hydrostatic test life.
  • Robust internal components for ultra high pressure service.
  • Extra heavy, robust forging for strength at high pressure and the most demanding applications.
  • The 3000PSI outlet is protected with secondary 2800-3000PSI safety device to protect downstream equipment.
  • Easy operation under all pressures.
  • 100% leak testing on entire production.
  • Meets and exceeds CGA V9 and ISO 10297.
  • Passed stringent adiabatic oxygen compression testing per ISO 10297.
  • All valves bagged for cleanliness no matter the gas service intended.
  • Lower plugs are designed specific for the gas service intended.
  • Unitized plug with robust hex and threads insure easy installation.
  • Common design safety and handwheels readily available.
  • Most valves are tapped for siphon tubes.
Part number VHD347-346-6-1-6750 is pressure reducing integral regulator cylinder valve with CGA347/CGA346 Dual Outlet, 3/4 NGT, 6750PSI
Specifications and Optional Features
All valves are supplied with safety relief devices as specified by the Compressed Gas Association Standard S1.1. Safety relief devices are a CG1, one piece brass plug and disc design for added safety. The suffix xxxx denotes pressure relief device burst disc rupture pressure. Refer to the safety device ordering information chart for pressures available.
Part Number CGA Designation Gas Service Inlet Thread Size Safety Device Service / Safety
VHD347-346-6-1-XXXX CGA347/CGA346 Breathing Air 3/4 NGT CG1 Customer Specified
VHD347-346-6-1-XXXX-24 CGA347/CGA346 Breathing Air 3/4 NGT 24OS CG1 Customer Specified
VHD347-346-25E-1-XXXX CGA347/CGA346 Breathing Air 25E CG1 Customer Specified
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