A control valve for limiting pressure down-surges during hydrant operations

配水系统的设计要求系统中任何点的压力保持在最低水平以上，以确保满足预期需求的足够流量。最小压力标准通常是为配水系统的安全运行而设定的，其目标是允许供应所需的流量，以防止运行期间的直接污染。然而，最小压力标准往往是违反瞬态事件，如快速消防栓开口的事件。一种便携式控制装置，可以快速连接到一个消防栓被认为是在这里限制低瞬态压力，以期望的水平，即使消防队员打开消防栓一样快，他们会。如何设计和应用这种新型器件进行瞬态保护是本提案的核心。通过使用该装置，在消防栓或阀门操作期间，可以更好地控制供应系统和其他液体系统中的压力，使得供水公司和保险公司可以降低他们所要求的最小压力标准。由此产生的超压的减少可以通过减少管道破裂频率、泄漏率、系统能量使用和水需求而为公用事业带来大量的运营节省。

The design of water distribution systems requires that pressures at any point in the system be maintained above a minimum level to ensure adequate flows for satisfying expected demands. A minimum pressure criterion is typically set for the safe operation of water distribution systems with the goal of allowing the supply of the required flows to prevent direct contamination during operations. However, the minimum pressure criterion is often violated during transient events resulting from events like rapid fire hydrant openings. A portable control device which can be quickly attached to a hydrant is conceived here to limit low transient pressures to desired levels even if fire crews open the hydrant as fast as they would. How the novel device can be designed and applied for transient protection is the heart of this proposal. With the use of this device, pressures in supply systems and other liquid systems can be better controlled during hydrant or valve operations such that water utilities and insurance companies can reduce the minimum pressure criterion that they require. The resulting reduction of excess pressures can result in large operational savings to utilities through reduced pipe break frequencies, leakage rates, system energy use, and water demands.