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Model TWBS.EWE, lead-free Emergency Valve (patent pending) thermostatically mixes hot and cold water to provide a safe fluid supply for emergency 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.)
APPLICATION: Tempering valve to blend hot and cold water to deliver tepid water. Valve has flow capacity of 0.5 to 6 gallons per minute (GPM). Valve can be used with eyewash, eye/face wash, dual purpose eyewash/drench hose and drench hose units.
TEMPERATURE CONTROL: Valve has bimetallic thermostat that senses incoming water temperature and automatically blends water to 85F (29C). High temperature limit stop is set to 90F (32C). Valve has dial thermometer on outlet to monitor temperature of delivered water. Note: Valve may need to be adjusted when installed based on incoming water temperature. Refer to "Installation Instructions" for further information.
FAIL SAFE: In event of restriction or failure of hot water supply, internal bypass allows valve to deliver cold water to emergency unit. In bypass mode, valve will deliver 4 GPM of cold water at 30 PSI flow pressure. In event of loss of cold water supply, valve will close and not deliver water.
FLOW CAPACITY: Refer to chart below for flow capacity of valve at specified pressure drops:
System Pressure Drop (PSI) 5 10 15 20 25 30 35 40
Flow Rate (GPM) 2.5 4 5 6 7 8 8.5 9.5
System Pressure Drop (bar) .3 .7 1.0 1.4 1.7 2.4 2.4 2.8
Flow Rate (Liters per Minute) 9.5 15 19 23 27 30 32 35
SUPPLY PRESSURE: 30 PSI minimum supply pressure is required for proper operation of valve. Maximum supply pressure is 125 PSI.
MOUNTING: Furnished with heavy duty mounting bracket for securing valve to panel or wall.
INLETS: 1/2" nominal sweat female hot and cold water inlets. Each inlet has check valve and supply stop.
OUTLET: 1/2" NPT female outlet.
QUALITY ASSURANCE: Valve is completely assembled and water tested prior to shipment. Unit is certified to ASSE 1071. Important: Pursuant to ANSI Z358.1-2004, the water delivered by emergency equipment should be "tepid". Tepid is defined as moderately warm or lukewarm, and is generally considered to be between 60F (15C) and 90F (32C). However, in certain circumstances, a chemical reaction may be accelerated or otherwise affected by the water temperature. Please consult with a medical adviser to determine the optimum delivered water temperature prior to specifying, installing or using a tempering valve. Tempering valves will not deliver the appropriate water temperature if the system has not been sized correctly. Please refer to the flow capacities and supply pressure requirements listed above when designing the tempered water system and selecting tempering valves. Tempering valves, like all emergency eyewash and shower equipment, must be installed in accordance with the manufacturer's instructions and maintained on a regular basis. Under ANSI Z358.1-2004, all emergency equipment should be activated weekly and inspected at least annually. Tempering valves should be treated the same and, in addition, must be regularly cleaned and cycled. br>
APPLICATION: Tempering valve to blend hot and cold water to deliver tepid water. Valve has flow capacity of 0.5 to 6 gallons per minute (GPM). Valve can be used with eyewash, eye/face wash, dual purpose eyewash/drench hose and drench hose units.
TEMPERATURE CONTROL: Valve has bimetallic thermostat that senses incoming water temperature and automatically blends water to 85F (29C). High temperature limit stop is set to 90F (32C). Valve has dial thermometer on outlet to monitor temperature of delivered water. Note: Valve may need to be adjusted when installed based on incoming water temperature. Refer to "Installation Instructions" for further information.
FAIL SAFE: In event of restriction or failure of hot water supply, internal bypass allows valve to deliver cold water to emergency unit. In bypass mode, valve will deliver 4 GPM of cold water at 30 PSI flow pressure. In event of loss of cold water supply, valve will close and not deliver water.
FLOW CAPACITY: Refer to chart below for flow capacity of valve at specified pressure drops:
System Pressure Drop (PSI) 5 10 15 20 25 30 35 40
Flow Rate (GPM) 2.5 4 5 6 7 8 8.5 9.5
System Pressure Drop (bar) .3 .7 1.0 1.4 1.7 2.4 2.4 2.8
Flow Rate (Liters per Minute) 9.5 15 19 23 27 30 32 35
SUPPLY PRESSURE: 30 PSI minimum supply pressure is required for proper operation of valve. Maximum supply pressure is 125 PSI.
MOUNTING: Furnished with heavy duty mounting bracket for securing valve to panel or wall.
INLETS: 1/2" nominal sweat female hot and cold water inlets. Each inlet has check valve and supply stop.
OUTLET: 1/2" NPT female outlet.
QUALITY ASSURANCE: Valve is completely assembled and water tested prior to shipment. Unit is certified to ASSE 1071. Important: Pursuant to ANSI Z358.1-2004, the water delivered by emergency equipment should be "tepid". Tepid is defined as moderately warm or lukewarm, and is generally considered to be between 60F (15C) and 90F (32C). However, in certain circumstances, a chemical reaction may be accelerated or otherwise affected by the water temperature. Please consult with a medical adviser to determine the optimum delivered water temperature prior to specifying, installing or using a tempering valve. Tempering valves will not deliver the appropriate water temperature if the system has not been sized correctly. Please refer to the flow capacities and supply pressure requirements listed above when designing the tempered water system and selecting tempering valves. Tempering valves, like all emergency eyewash and shower equipment, must be installed in accordance with the manufacturer's instructions and maintained on a regular basis. Under ANSI Z358.1-2004, all emergency equipment should be activated weekly and inspected at least annually. Tempering valves should be treated the same and, in addition, must be regularly cleaned and cycled. br>
WARNING: California Residents
This product and/or packaging can expose you to chemicals including Styrene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.