Automatic Cascading Sequence Valve | 6000 psi Aluminum


The model 1018 valve is an open-shut valve having two control pressure ports. When pressure is applied
to the top port the valve opens. When pressure is applied to the side control port the valve closes. When no pressure or equal pressures up to 6000 psi are applied to both control ports the valve is held open by a bias spring. Its primary function is control of cascade systems used for such purposes as filling breathing air cylinders and vehicle CNG (compressed natural gas) tanks. Used between a compressor and cascade system of storage tanks the 1018 valve can be used to fill the highest pressure bank first, then the next highest, etc. without operator assistance.



Type Sequence Valve
Maximum Rated Pressure 6000 psi
Maximum Differential Pressure 6000 psi
Outlet Pressure Rating 6000 psi
Maximum Control Pressure 6000 psi
Bias Pressure  250 psi standard
Open Bias Pressure 7% greater pressure required on shut control relative to open control to actuate valve closed
Inlet Port Size 1/4 in MNPT
Outlet Port Size 1/4 in FNPT
Control Port Size Close Control = 1/4 in FNPT
Open Control = 1/4 in MNPT
Flow Coefficient (Cv) 0.05 (equals 0.07 in orifice)
Leakage Bubble tight
Weight 15.5 oz (440 g)
Overall Length 7.25 in
Hex Diameter 1-3/8 in
Minimum Temperature -15ºF (-26ºC)
Body Material Anodized Aluminum
Internal Materials Brass 
Seal Materials Kel-F
Flow Coefficient (Cv) 0.094 in orifice diameter
Special Note Safety wire holes on device; no safety wire included.

Typical Applications

  • Automatic control of flow from cascade banks or air, CNG or other gases to portable tanks.
  • Automatic control of compressor operation when filling cascade banks such that the compressor can operate at pressure no higher than the bank being filled.
  • Application where it is economical or desirable not to have electronic controls, such as in CNG fill stations, where such controls could be a hazard.
  • Numerous other applications where two reference pressures are compared and the valve is to be open when one reference pressure exceeds the other.