Emerson Fisher's N120 Series are soft seated, holding a differential backpressure on liquid meters. A N120 Series backpressure valve is installed after the meter and it holds backpressure on the meter until vapor is forced back to the tank through the vapor eliminator. Standard product temperature rating is -20 to 160°F (-29 to 71°C). In this way vapor cannot form within the meter during liquid delivery.
Intended for smaller pumps, the N120 Series are ideal on such applications as cylinder filling installations. All units have a 1/4 in. FNPT tapped and plugged boss on the inlet side of the body and can be used for both LPG and Anhydrous Ammonia (NH₃) service. The N120 Series has a 1/4 in. FNPT connection in the closing cap for attachment of an external line from the tank vapor space or vapor eliminator.
Features
- Closing Cap
- Pressure Sensing Orifice
- Piston Inner Valve
- Exclusive Venturi Passage
Specifications
- Liquid Meter Size: Both 3/4 and 1 in.
- PSID Setting: 12 psig (0.83 bar)
- PSID Range: 10 to 20 psig (0.69 to 1.4 bar)
- Maximum Inlet Pressure: 400 psig (27.6 bar)
- Temperature Capabilities: -20 to 160°F (-29 to 71°C)
Downloads
Instruction Manual (PDF Download)
Replacement Parts Sheet (PDF Download)
N120 Series Bypass Valve Schematic (PDF Download)
