Brochure
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A
HIGH/LOW THERMOSTATIC MIXING VALVE FOR PLUMBING
Adjustable thermostatic high low mixing valve for point of distribution in
domestic water systems.
Low-lead brass valve bodies.
Locking set point knobs on thermostatic mixing valves.
Check valves on thermostatic mixing valve cold inlets.
Locking set point knob on pressure reducing valve.
Copper connecting tubing, all sweat construction.
Double union connection on all valves for ease of service.
Removable ½" NPT threaded outlet thermometer.
Pre-mounted to strut for easy mounting.
Max. working pressure: 200 psi.
Max. inlet temperature: 180ºF.
Adjustable range: 95—150ºF.
Flow range: 1 to 50 gpm.
Thermostatic mixing valves meet requirements of ANSI/NSF 372-2011 and
certified to ASSE 1017, CSA B125.3, UPC, IPC, Low Lead Laws and list-
ed by ICC-ES for use in accordance with the U.S. and Canadian plumb-
ing codes. Pressure reducing valve is certified to ASSE 1003, CSA B356,
NSF61, NSF 372 Low Lead Laws and listed by ICC-ES. Meets codes IPC,
IRC & UPC for use in accordance with the U.S. and Canadian plumbing
codes.
NA523
DELTA2
™
Code Description Lbs USD
NA52367HL 1" sweat inlets, 1¼" sweat outlet, copper 25 4,455.00
NA10512 Ball valve stems extension kit 0.9 173.00
Function
The NA523 two-stage high low mixing valve system delivers tempered
water for a wide range of flows in a single assembly, applicable for
institutional and commercial applications such as hotels, nursing
homes, hospitals, schools, and so on. The NA523 is furnished
assembled and pressure tested with large and small mixing valves along
with a pressure reducing valve, to function as one system in providing
a broad flow range from 1 gpm to 50 gpm. This one-piece assembly
also contains an outlet thermometer, cold water inlet check valves,
and shut-off ball valves. The mixing valves are piped in parallel to the
hot and cold inlet lines and the pressure reducing valve is piped on the
outlet (mixed temperature) side of the larger thermostatic mixing valve.
When demand is low, the small thermostatic mixing valve provides the
needed water flow. When demand increases, indicated by increasing
Delta P (differential pressure) in the system, the pressure reducing valve
sees this fall off pressure, and opens to allow flow through the larger
thermostatic mixing valve.
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MIXED
COLD HOT
Application Diagram