| 摘要 |
Valve assembly for zone control valves of the type employed in hydronic temperature control systems. The valve incorporates a control unit which can readily be separated from the valve structure without emptying fluid from the system. An improved sealing structure provides the valve itself and allows the separation noted above. In this way, the control unit and the valve seals can be replaced readily in the field, are long-lived and capable of continuous trouble-free usage. Variations in the control of the heating system are also shown.
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