In-Line Reducing Regulator: 6000 psi In > 100–300 psi Out


The model 1247 is a small, piston type, suitable for in-line mounting. Although the outlet pressure is adjustable it is primarily used in application where it is preset and not adjusted in the field. It has one inlet and one outlet port. Maximum inlet pressure in 6000 psi. Outlet pressure range: 100–300 psi (7–21 bar). The regulator is self venting when outlet pressure exceeds set pressure by 20 to 40%. It offers an economical way to provide low pressure service air from a high pressure storage system or compressor.



Type In-line reducing regulator
Maximum Rated Pressure 6000 psi (414 bar)
Outlet Pressure Range 100–300 psi (7-21 bar)
Outlet Pressure Rating 1000 psi (69 bar)
Flow coefficient (Cv) 0.03 (equals 0.04 inch orifice)
Outlet Pressure Variation
with Inlet Pressure
8 psi drop/1000 psi inlet drop
Weight 5.3 oz (150 g)
Overall Length 3.75 in
Hex Diameter 1 in 
Minimum Temperature -15°F (-26°C)
Inlet Port Size 1/4 in FNPT
Outlet Port Size 1/4 in FNPT
Body Material Anodized Aluminum
Internal Materials Brass 
Steel Spring
Seal Materials Buna-N

Typical Applications

  • Component testing
  • Air tank fill stations to eliminate need of low pressure compressors and storage
  • Firefighting air stations to provide tire inflating air
  • Instrumentation and calibration of panels
  • Process industry control
  • Aircraft service carts to eliminate need for low pressure compressor
  • Low pressure air to operate high pressure operated valves