The purpose of the thief hatch is to work in tandem with the vent valve to minimize the escape of light ends of crude in lease storage tanks by maintaining a pressure on the tank. A vacuum relief function is also standard to prevent a suction or draw down from collapsing the tank. The thief hatch permits access to the contents of the tank for sampling and gauging.

• Base and Lid Size: Nominal 8″ Round
• Bolt Pattern: 16 Holes at 10 3/8″ Circle (API)
• Construction: All Teflon Coated Aluminum Castings
• System Operations: Spring Loaded Pressure and Vacuum
• Standard Settings: 4 Oz. Pressure 0.4 Oz. Vacuum
• Standard Settings of 4.0 Ounce Pressure and 0.4 Ounce Vacuum With Optional Pressure Springs for 2, 6, 8, 12, and 16 Ounce Settings

Sized to provide emergency relief due to overpressure from tank inside. When internal pressure is beyond the capacity off breather vent, it is your last line of defense for your tank. Pressure is set above that of your PVRV.

• SIZE: 10” – 20” – 24”
• CONSTRUCTED: carbon steel, stainless steel, additional metals and coatings
• Proximity switch option available to notify when EPRV is relieving

The breather valve model 1000 series is part of FNC’s line of high performance pressure-vacuum relief valves. It is designed to provide pressure and vacuum relief to maintain tank vapor space within safe operating parameters in a closed pipe-away design.

• Advanced materials for seat and pallet provide superior resistance to corrosion, chemical attack, liquid and vapor adhesion, temperature extremes and sticking due to valve seat freeze
• Standard test for compliance with API2000 and API 527 (1 SCFH at 90% of set pressure)
• Stainless steel seat and pallet
• Proximity switch option, to detect open and closed position of PVRVs

The breather valve model 1000 series is part of FNC’s line of high performance pressure-vacuum relief valves. It is designed to provide pressure and vacuum relief to maintain tank vapor space within safe operating parameters.

• Advanced materials for seat and pallet provide superior resistance to corrosion, chemical attack, liquid and vapor adhesion, temperature extremes and sticking due to valve seat freeze
• Standard test for compliance with API2000 and API 527 (1 SCFH at 90% of set pressure)
• Stainless steel seat and pallet

Proximity switch option, to detect open and closed position of PVRVs