The SPRD is used on zone systems when the automatic closing of various zone dampers can create an excessive increase in air pressure and velocity throughout the duct system.
SPRD旁通阀是当各种区域风门自动关闭时用在区域系统中,可以在管道系统中增加空气压力盒速度。
2
Morever and from south to north and from east to west, the velocity and distance of rift opening became smaller and the velocity of rift closing faster.
而且裂谷从南到北,从东到西,拉张的速度、距离变小,而闭合速度变快。
3
Application Cavitation, liquid hammer and pressure peak may occur in hydraulic systems with changes in flow velocity, e. g. fast closing of a valve or pump starts and stops.