The valve consists of 4 main parts or units:

  • A body, the bottom of which screws onto the cylinder, with a
    standard O ring seal.
  • A check that can move within the bore of the body, thus enabling
    the valve to open.
  • A cap that screws on to the upper part of the body and contains a
    tripping orifice for instantaneous valve operation.
  • A safety device protects the cylinder against overpressure due to
    excessive temperature, this device operates if the temperature
    exceeds 70 C at the maximum filling ratio.