| 摘要 |
A pressure regulating valve is provided having a balance diaphragm for positioning a slide valve in flow controlling relation to maintain a fluid outlet in pressure balanced relation despite pressure variations at the inlet. The valve arrangement includes in combination with the inlet a pre-sensing chamber to apply a biassing force component on the valve member in a closing direction, responsive to inlet pressure. In a further embodiment utilizing a pair of such valves in opposed mutually balancing relation as a pressure balancing valve, in addition to modifying the characteristic valve response time, the arrangement has the particular benefit of being able to virtually close off the flow from one of the two sources of line pressure in the event that pressure at the respective other inlet falls to an ineffective value. While useful with many fluids, particular utility is found in mixing hot and cold liquids.
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