.~ With means to control dredger operation (e.g., movement of dredged material) in response to sensed condition {3}
311
.~.~ Suction relief valve
DEFINITION
Classification: 37/311
Suction relief valve:
(under subclass 309) Apparatus wherein pressure or force in a dredge pipe is maintained within predetermined limits by operation of a membranous structure which restores the pressure or force back to normal operating conditions by elimination of an obstruction from the pipe. [figure]
[caption]A - Suction pipe; B - Obstruction (e.g., mud ball, stone); C - Tubular passage; D - Nozzle; E - Valve seat; F - Pivoted flap valve; G - Pivot; H - Valve control means
(1) Note. Usually the function of the relief valve is to relieve excessive vacuum in the suction pipe resulting from plugging of the intake end with the material and to correct velocity drop in the discharge pipe resulting from overloading with the material.
(2) Note. The valve eliminates suction-slugging caused by caving banks, sudden changes of material, or pockets of gas.
(3) Note. When triggered by an abnormal pumping condition, the cable will remain open, admitting water in an amount required to maintain velocity. When the abnormal condition no longer exists, the valve closes slowly, at a rate depending upon the recovery characteristics of the pump.
SEE OR SEARCH CLASS
137, Fluid Handling,
455+, for subject matter wherein a valve is controlled in response to a change in the fluid condition. 406, Conveyors: Fluid Current,
29+, for regulating the introduction of the load through the inlet of the fluid current conveyor.
417, Pumps,
307+, for a pressure responsive relief valve used for controlling pumped fluid.
