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For electrical zone valves, the motor is often a small shaded-pole synchronous motor combined with a rotary switch that can disconnect the motor at either of the two stopping points ("valve open" or "valve closed"). In this way, applying power to the "open valve" terminal causes the motor to run until the valve is open while applying power at ...
This allows a more granular application of heat, similar to non-central heating systems. Zones are controlled by multiple thermostats. In water heating systems the thermostats control zone valves, and in forced air systems they control zone dampers inside the vents which selectively block the flow of air. In this case, the control system is ...
In 1974, Honeywell released the 68/80 which added cache memory in each processor and support for a large (2-8 million word) directly addressable memory. [3] In 1975, the 6000-series systems were renamed as Level 66 , which were slightly faster (to 1.2 MIPS) and offered larger memories.
A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. [1] This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level.
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Next time, though, you'll want to add Wikilinks where they exist; Honeywell certainly has an article. Atlant ( talk ) 01:58, 17 January 2008 (UTC) [ reply ] I did not expect them to have WP articles, and anyway, most of them do not.
The full name for this most common type of downhole safety valve is a Tubing Retrievable Surface Controlled Sub-Surface Valve, shortened in completion diagrams to TRSCSSV. If a tubing retrievable valve fails, rather than go to the expense of a workover, a "wireline retrievable" valve may be used instead.
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