July 16, 1998 - Armstrong Inc.
MegaMix E50W Water Temperature Mixing Unit
Category: Water Temperature Mixing Unit
Type: MegaMix
Model: E50W
The water temperature mixing unit shall be a 3 port mixing valve using a single moving shear action disc for inlet control and fitted with an electronic actuator and integrated temperature sensor. Mixing shall occur within the body of the valve and the temperature probe shall be integrated into the blended water outlet port. The mixing unit shall have an integral control keypad and be capable of both stand alone operation and integration into an automation or remote control system. The actuator shall aggressively respond to inlet pressure and temperature changes and control the mixing valve to minimize outlet temperature variations. The actuator shall be software configurable. Materials of construction and items included shall be:
1. Valve body of 316 stainless steel with 2” NPT hot and cold inlet ports and 2-1/2” NPT blended water outlet port
2. Shear Action Discs of ceramic material
3. Non-contact optical encoder for failsafe zero position feedback
4. Electronic actuator enclosure designed to NEMA 4
5. Integrated temperature sensor
Performance: The valve shall be of a design which provides top entry for inline access to internal parts. The valve shall provide bubble tight zero seat leakage shut off and conform with design verification ASME B16.34. The actuator shall be 100% duty cycle rated and be powered by a regulated 24VDC 5A supply. The actuator shall accept and provide 4-20mA analog control signals. The water temperature mixing unit shall include all of the following capabilities:
1. A valve operating temperature range of -13°F to 257°F
2. Output water temperature control to within +/- 1°F over a 32°F to 212°F control range
3. Blending to within 1°F of either hot or cold inlet temperature
4. Rated pressure of 145 psi
5. Manual override via a handle on the actuator
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