Thermostatic Mixing Valve

Part Ref: EU-TWBS.SHE


Model TWBS.SHE; Lead-free AXION® Emergency Tempering Valve thermostatically mixes hot and cold water to provide a safe fluid supply for emergency shower and eyewash equipment, with a flow rate of 74 gpm (280 L).

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Description

Model TWBS.SHE, lead-free Emergency Valve (patent pending), thermostatically mixes hot and cold water to provide a safe fluid supply for emergency shower and eyewash equipment. The valve contains a secondary high temperature limit valve to provide additional protection to the user in the event of main tempering valve malfunction. Additionally, to ensure a fail-safe water supply for emergency shower and eyewash stations, a series of cold water by-pass valves open in the event of hot water pressure loss. (No gauges supplied – ASSE 1071 standard recommends gauges be placed 5 to 8 feet (1.52 to 2.44 m) downstream for the most accurate temperature measurement.)

  • A flow rate of 1 to 74 gpm (280 L) for better temperature control across the operating range
  • AXION’s superior design and technology provide a complete safety solution for increased victim comfort.
  • Lowest internal pressure drop for this class of valve (advantage where supply pressure is low)
  • Wax based thermostat technology for fast response time with proven highly reliable temperature control
  • Highest Cold Water Bypass flow rate in the industry (68% of rated tepid flow rate)
  • Modular lead-free brass design with internal check stops
  • Over-sized valve seats resist failures caused by foreign matter
  • A new and efficient shuttle design eliminates valve binding
  • A custom funnel design improves temperature control at low flow rates
  • Outlet temperature is factory set to 85® F (29® C)
  • Tempered water: High temperature limit is factory set to 87® F (30® C)
  • Cold water by-pass valves are closed during normal operation, regardless of flow rate

Technical Details

Model TWBS.SHE (patent pending) is a thermostatic mixing valve that mixes hot and cold water to supply tempered water to emergency eyewash fixtures requiring flow up to 74 gpm (280 L). Unit employs a paraffin filled thermostatic mixing element and a secondary high temperature limit valve to provide additional protection. Lowest internal pressure drop where supply pressure is low, and a high Cold Water Bypass flow rate of 50 gpm (189 L). The modular lead-free brass design with a one piece casting uses internal check stops, over-sized valve seats, a shuttle design that eliminates valve sticking, and a funnel design to improve temperature control with better mixing at low flow rates. Lime and calcium resistant components are used throughout. The outlet temperature factory setting is 85® F (26® C). Maximum operating pressure: 125 psi (8.62 Bar). Temperature adjustment range 60 – 90® F (16 – 35® C). Maximum inlet temperature: 180® F (82® C). Recommended inlet temperature: 140® F (60® C). Minimum inlet temperature: 120® F (49® C) Inlet 1-1/4″ NPT(F). Outlet 1-1/4″ NPT(F).

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