The F/FG series valve is the most economical way to protect outdoor pipelines and vessels from expensive freeze damage. A thermal actuator automatically opens the valve before the temperature of the fluid drops to the freezing point. By bleeding the fluid in the system only when the danger of a freeze-up exists, the valve delivers positive freeze protection with minimal waste. This intermittent operation provides substantial savings in water and sewer costs, making the F/FG series valve an ideal, economical replacement for systems with manually operated block valves that are opened seasonally. The F/FG series can also be used in most applications that involve automatic control of fluids, such as glycol, oil, light chemicals, etc.

Note: Specify temperature between 35° and 255°F in 5°F increments. Differential from full open to full closed is typically 10° to 15°F. Valve opens/closes gradually.

Unit of Measure


NPT Thread Size

N/A 3/4 in

Valve Type

N/A FG Series Automatic Freeze Protection and Fluid Temperature Control Valve

Port Size

N/A 1/4 in

Maximum Operating Pressure

N/A 150 psig

Flow Coefficient (Cv)

N/A 1.6

Valve Action

N/A Direct

Body Material

N/A Bronze

Dimensional Drawing

F/FG Schematic Figure 3
Dimension A1 N/A 3-1/2 in
Dimension B2 N/A 7-5/16 in
Dimension C3 N/A 6-1/4 in

Net Weight

N/A 5-1/2 lb

The Ogontz Guarantee

N/A We will repair or replace on a no-charge basis, FOB Willow Grove, PA, any valves or traps returned to us within 18 months, if found to be defective in material or workmanship.

Typical Applications

N/A Air Scrubbers Condensate Returns Cooling Towers Exposed Water Lines - indoors or outdoors Fire Lines Safety Showers Ship Supply Lines Sprinkler Systems Tanks

Plug Material

N/A PTFE Silicone
  • 1 ±1/8 in Tolerance
  • 2 ±1/8 in Tolerance
  • 3 ±1/8 in Tolerance