Steam Injector

Metcalfe Automatic Restarting Injectors

High Pressure Injectors
Our high pressure injectors are available in various sizes from 3/8" to 2 1/2" pipe size. They use less steam than 'standard' injectors at the same operating pressure giving them higher suction life and allowing them to operate with higher water temperatures.
Designed for suction lift applications with pressures from 50 to 200 psi and upto 250 psi with water pressure supply.
Suction Lift  
  • Start at low pressures with 50 psi steam with 3ft lift and 74F water.

  • Work High - upto 200 psi steam pressure - 3ft lift & 74F water.

  • Lift Water - 20ft lift with 80-120 psi and 74F water

Steam Injectors
Standard Steam Injectors

Suitable for pressures upto 250psi with water pressure supply or suction lift applications with steam pressure from 25 to 140psi.

Available in all sizes for screwed connections from 3/8" to 2 1/2" pipe size. Our standard injectors are designed to meet the requirements of most applications.

Max Temperature of suction water with 3ft lift 
  • 120C at 120psi.

  • 115C at 140 psi

  • 105C at 170 psi

  • 90C at 200 psi

Suction Lift  
  • Start at low pressures with 25 psi steam with 3ft lift and 74F water.

  • Work High - upto 140 psi steam pressure - 3ft lift & 74F water.

  • Lift Water - 20ft lift with 60 -80 psi and 74F water

Max Temperature of suction water with 3ft lift 
  • 120C at 60-80psi.

  • 115C at 100 psi

  • 105C at 120 psi

  • 90C at 140 psi

Steam Injector Capacities
Capacity Table 

​Deliveries, Approximate deliveries in imperial gallons per hour.

Feed water at 74 degrees F. 3 foot lift.

Deciding the correct size injector to install
This requires careful consideration with regards to the max and min steam pressure, the position and temperature of the feed water, and the evaporation of the boiler when steaming at full capacity.
The injector selected should be capable of passing approximately 75 per cent more water per hour than will actually be required by the boiler. For example, by referring to the capacity chart that for a boiler working at 100 lbs with an evaporation of 2,000 lbs per hour, feed water 3ft below the injector at a temperature of approx 74 degrees F, an injector capable of passing 3.55lbs or 300 gallons should be fitted. Therefore the correct size would be a 1" size CC. The fact this injector will deliver more is a definite advantage, and under no circumstances should the next smaller size be chosen.
Injectors must be fixed in a vertical position and the injector should work equally well with the water feed water supply either above or below.
Steam Injectors

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