Morrison Bros. 710F Series 2 in. Flanged Anti Siphon Solenoid Valves w/ PTFE Seals

2" Flanged Fail-Safe Anti-Siphon Protection for Fuel Systems & Data Center Cooling Infrastructure

The Morrison Bros. 710FSS Series 2" flanged solenoid valve is a normally closed, hung-piston isolation valve designed for dispensing-side installation on above-ground fuel storage systems, where it prevents accidental gravity siphoning in the event of a downstream pipe fracture or leak below tank level. The 304 stainless steel body and PTFE seals make this variant well-suited for aggressive or water-based media, including water-glycol mixtures and compatible dielectric fluids used in coolant distribution units (CDUs). For data center liquid cooling facility infrastructure, the 2" size serves as a compact, code-compliant isolation point on individual tank outlet lines or smaller-diameter transfer headers because the zero-pressure-differential hung piston allows gravity-fed drainage and low-pressure fluid transfers without requiring an active pump to open the valve. The integral thermal relief mechanism vents expansion pressure in the reverse direction of flow, preventing over-pressurization in closed loops where fluid may be trapped between shutoff points. UL certification for Class I, Division 1 (Groups C and D) hazardous locations means this valve can serve double duty in mechanical yards shared with diesel generator fuel systems, which simplifies parts standardization across fuel and cooling infrastructure.

The 2" configuration fits tightly into existing ANSI 150 RF flanged piping at the tank or CDU interface without requiring a major header upsizing, making this model a practical retrofit choice on installations where a 3" valve would be oversized. A continuous duty Class H coil rated at 30 watts operates at 120V AC standard (with alternative voltages available) and the watertight NEMA 3/4X/7/9 enclosure handles outdoor and wash-down environments. Install a 100-mesh inlet strainer upstream as required by the manufacturer to maintain warranty and prevent piston malfunction from particulate contamination.

Key specifications:

• Body: 304 stainless steel; Seals: PTFE
• Flange size: 2"; Orifice: 1.5"; CV: 27
• Operating pressure differential: 0–105 PSI (min–max)
• Max fluid temperature: 302°F
• Max viscosity: 60 centistokes
• Coil: Continuous duty Class H, 30W, 120V AC standard (24, 208, 220, 240, 480V AC and 12, 24, 48V DC available)
• Connections: ANSI 150 RF flanged
• Enclosure: Watertight, explosion-proof NEMA 3, 4X, 7, 9; Groups C and D
• UL Certified: Class I Div. 1 Groups C&D; Class II Div. 1 Groups E, F&G; Class III; cULus Listed
• Conduit: ½" connection; 18" lead wire included
• Mounting: Horizontal pipeline, solenoid vertical and upright

NOTE: Product can only be pumped in one direction, the direction of the flow arrow. Not designed for use as an overfill prevention or process control valve.

Features

• Normally closed, hung piston design
• Install in a horizontal pipeline in the upright vertical position
• Zero pressure differential
• Integral thermal relief allows the valve to relieve expansion pressure in the opposite direction of flow
• Continuous duty Class H standard coil operates at 120 volts
• Enclosure is watertight and rated for hazardous locations—NEMA 3, 4X, 7 and 9; groups C and D
• Several optional coil voltages available
• 710MO has manual override feature. Available in sizes ranging from ¾″ to 2″ for operation during a power outage
• Recommended for use with liquids having a maximum viscosity of 60 centistokes
• A strainer with a 100 mesh screen is recommended at the valve inlet

Construction Details

• Body: Cast bronze
• Seals: Viton®, PTFE
• Solenoid housed in an integral, watertight, explosion-proof shell

Certifications

• CSA approved for hazardous locations
• Class I, Groups C and D
• Class II, Groups E, F and G
• Class III
• T3C