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ST-90 AND STG-900

Application: Synthetic Turf Sports Fields
Radius: 103′ to 120′
Rotors: ST-90 & STG-900
Flow: 74.5 to 92.0 GPM
Inlet Size: 1½” NPT (ST90) or 1½” ACME (STG900)

Top-quality ST System long-range rotors are dedicated to synthetic turf sports field irrigation.


Simple to specify, contractor-friendly to install, and easy to service and maintain for the end-user, the Hunter ST System is the first and only cost-effective, fully integrated solution designed to exceed the unique and specific needs of the synthetic turf irrigation market.

The Hunter ST System features gear-driven long-range rotors based on Hunter’s legendary rotor technology coupled with a special multi-axis swing joint, low-pressure loss valves and a robust feature-packed vault. Combined, they provide the ultimate in installation flexibility and long-term total access to all irrigation components, including the swing joint point of connection. Such complete access is an absolute must when the surrounding synthetic surface is not easily excavated and restored to original condition without huge expense and specialized equipment and procedures.

  • Arc setting: 40° to 360°
  • QuickCheck™ arc mechanism
  • Through-the-top arc adjustment
  • Water-lubricated gear drive
  • Factory-installed rubber logo cap
  • Nozzle trajectory: 22.5°


ST ROTORS: ST-90 / STG-900

Hunter synthetic turf rotors are designed specifically to satisfy the unique needs of synthetic turf irrigation. Robust, reliable, and engineered for longevity in high flow and high pressure conditions, ST rotors in the 103′ to 120′ category are available in two configurations:


This model features a smaller exposed surface area and jar-top access to the riser assembly. The ST-90 is ideally suited for direct burial in the natural turf that is sometimes adjacent to the synthetic field to be irrigated.


Featuring a slightly larger exposed surface area, this model includes through-the-top access to the riser assembly. The STG-900 is ideally suited for installation within the ST vault that is installed under the synthetic surface. It can also be installed in the natural turf that is sometimes adjacent to the synthetic field to be irrigated.


Traditional swing joints will cause the rotor to move back and forth as the elevation of the rotor is raised and lowered. While appropriate for natural turf installations, synthetic turf systems require a completely different approach. The best way to support the rotor’s tremendous lateral thrust during operation is to place the rotor in a snug fitting hole within the vault’s cover set. In order to set the rotor perfectly to grade and in this very specific location the swing joint must provide flexible movement in every direction, not only up and down, but also forward, backward, left and right. Ideally, this flexibility would include the ability to “reset” the elevation grade of the rotor should the enclosure settle downward during the vibratory compaction of the surrounding field base material. Enter the Hunter Vertical Alignment (VA) swing joint. Offering the ultimate in flexibility, our vertical alignment swing joint includes six pivot points for multi-axis movement plus a seventh pivot at the outlet for rotational adjustments of the valve and rotor assembly. Constructed of rugged 2″  PVC pipe and fittings, this 315 PSI rated swing joint dramatically reduces dangerous water velocities and performance robbing pressure loss through the ST System’s components.


For some, the preferred approach to designing synthetic turf irrigation systems is the “block” type configuration with remotely located valves that are off the synthetic surface. The benefit of this configuration is that it removes all high-pressure mainlines from beneath the synthetic surface. Through the use of a remotely located isolation valve, constantly pressurized supply lines to the quick couplers can be removed from beneath the synthetic surface as well.

For others, the preferred approach is to use valve-in-head (VIH) rotors. However, typical VIH rotors have an unacceptably high-pressure loss at the high flows and pressures that are inherent in all synthetic turf irrigation systems. As a result, the Hunter ST System utilizes a valve adjacent to head (VAH) configuration. This design lowers the pressure loss down to a very acceptable 3.9 PSI at 75 GPM through the valve assembly.


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