Low Pressure Check and Excess Flow Valves

Low Pressure to 15,000 psi (1034 bar) Ball and O-ring Check Valves

Since 1945 Parker Autoclave Engineers has designed and built premium quality valves, fittings and tubing. Parker Autoclave's low pressure O-ring and ball check valves are capable of operating to 15,000 psi (1034 bar) and range in size from 1/16" to 1/2" tube size.     


  • O-ring and ball check valves.
  • O-ring and ball excess flow check valves.
  • Single-ferrule compression sleeve.
  • Fast easy make-up of connection.
  • Tubing sizes are 1/16, 1/8", 1/4", 3/8", and 1/2".
  • Molybdenum disulfide-coated gland nuts to prevent galling.
  • Operating temperatures from 0°F (-17.8°C ) to 650°F (343°C).


The low-pressure series uses Parker Autoclave's Speed Bite connection. This single-ferrule compression sleeve connection delivers fast, easy make-up and reliable bubble-tight performance, in liquid or gas service. Parker Autoclave's low pressure check valves are used for fluid handling for the chemical/petrochemical, research, and oil and gas industries.