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Limiting Orifice Valve Manual Gas Adjuster GAF

  • Sizes: ½” to 4”
  • Viton seal
  • Max. pressure = 5 PSI
  • Min. fluid temperature = -20°F
  • Max. fluid temperature = 360°F
Limiting Orifice Valve Manual Gas Adjuster GAF

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Description   Documentation   Ordering Information

Ordering Information

Ordering Information


Alternate Product

Model Model Inlet Outlet Connection Lead time Price Cart   Model Lead Time Order
Model 4GAF4
Inlet: ½"; Outlet: ½"; Connection: NPT
4GAF4 ½" ½" NPT Not Available N/A Not Available   NV1.N
Model 6GAF6
Inlet: ¾"; Outlet: ¾"; Connection: NPT
6GAF6 ¾" ¾" NPT
Model 8GAF8
Inlet: 1"; Outlet: 1"; Connection: NPT
8GAF8 1" 1" NPT
Model 10GAF10
Inlet: 1¼"; Outlet: 1¼"; Connection: NPT
10GAF10 1¼" 1¼" NPT
Model 12GAF12
Inlet: 1½"; Outlet: 1½"; Connection: NPT
12GAF12 1½" 1½" NPT
Model 16GAF16
Inlet: 2"; Outlet: 2"; Connection: NPT
16GAF16 2" 2" NPT
Model 20GAF20
Inlet: 2½"; Outlet: 2½"; Connection: ANSI (Weld)
20GAF20 2½" 2½" ANSI (Weld)
Model 24GAF24
Inlet: 3"; Outlet: 3"; Connection: ANSI (Weld)
24GAF24 3" 3" ANSI (Weld)
Model 32GAF32
Inlet: 4"; Outlet: 4"; Connection: ANSI (Weld)
32GAF32 4" 4" ANSI (Weld)


GAF gas adjusters are designed to provide accurate flow control. The conical needle or cylindrical plug valve has a micrometric adjusting stem, allowing excellent regulation capabilities even at reduced flows. A common screwdriver is used to perform adjustments with the GAF; no special tools are needed. A seal cap protects the adjustment screw and prevents leakage.


  • Micrometric flow regulation for non-aggressive gases (i.e. natural gas, LPG, air, nitrogen, etc.)

Installation and Regulation Notes

  • It is recommended to mount the GAF downstream of the measuring orifice.
  • Check that the GAF’s valve seat is free of foreign material prior to installation. If necessary, purge GAF with compressed air.
  • Disassemble GAF’s connection flanges (inlet/outlet) and install on the pipeline. Reassemble the connection flanges. Check for proper tightness of the gaskets.
  • Verify the pressure taps are closed and tight.

Flow rate regulation is controlled by manipulating the valve stem. Remove the plug cap and adjust the stem position using a common screwdriver.

  • Extract the stem to increase the flow rate.
  • Insert the stem to decrease the flow rate.

The GAF’s stem is fitted with positioners for maximum open/close positioning.


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