Morrison Bros. 710SS Series 2 in. Stainless Steel Anti-Siphon Solenoid Valves w/ PTFE Seal - Flanged

304 Stainless Steel Flanged Anti-Siphon Solenoid Valve for Corrosive & High-Purity Fluid Systems

The Morrison Bros. 710FSS Series 2-inch flanged solenoid valve is a normally closed, zero-differential-pressure design built for bulk fluid isolation and anti-siphon protection in pipelines handling aggressive or high-purity liquids. The 304 stainless steel body and stainless steel piston make this size well-suited for chilled water loops, glycol-based coolant headers, and deionized water circuits in data center liquid cooling infrastructure, including CDU inlet/outlet isolation and secondary loop backflow prevention. PTFE seals provide broad chemical resistance across a wide range of process fluids, making this valve a reliable choice wherever elastomeric seal compatibility is a concern.

The hung piston design opens with zero upstream pressure differential, maintaining reliable actuation even in low-pressure gravity-feed or fluctuating-pressure cooling circuits. An integral thermal relief feature bleeds expansion pressure in the reverse direction of flow, protecting downstream infrastructure from pressure spikes during thermal cycling. The continuous-duty Class H coil supports 24/7 energized operation without thermal degradation, and the NEMA 3/4X/7/9-rated enclosure ensures the solenoid housing remains sealed against moisture intrusion and condensation common in cooling environments. A 100-mesh inlet strainer is strongly recommended to protect the piston mechanism and preserve warranty coverage.

Key specifications:

• Body: 304 stainless steel
• Piston: Stainless steel
• Seals: PTFE
• Flange size: 2 in. | Orifice: 1.5 in. | CV: 27
• Operating pressure differential: 0–105 PSI
• Maximum fluid temperature: 302°F
• Power consumption: 30W | Standard voltage: 120V AC (multiple AC/DC voltages available)
• Enclosure: NEMA 3, 4X, 7, 9 — watertight, explosion-proof; Groups C and D
• Connections: Flanged, ANSI 150 RF
• Maximum viscosity: 60 centistokes
• UL Certified (Class I Div. 1, Groups C&D; Class II Div. 1, Groups E, F&G; Class III) | cULus Listed

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
• Several optional coil voltages available
• Enclosure is watertight and rated for hazardous locations—NEMA 3, 4X, 7 and 9; groups C and D
• 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: Stainless steel
• 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