Valves and valve actuation – With material guide or restrictor – Baffle or zigzag flow restrictor
Patent
1994-06-08
1996-06-11
Nilson, Robert G.
Valves and valve actuation
With material guide or restrictor
Baffle or zigzag flow restrictor
13762532, 251209, F16K 506, F16K 510
Patent
active
055248632
ABSTRACT:
A rotatable flow control valve mechanism is provided having a valve body having a valve chamber and straight through flow passages intersecting the valve chamber. A rotatable valve element, which may be of straight, spherical or tapered configuration, is positioned for rotation within the valve chamber and is sealed with respect to the valve body by sealing elements that surround the flow passages. The rotary valve element defines a straight through flowway that is aligned with the flow passages of the valve body in the fully open condition of the valve and permits unobstructed flow through the valve and, when the flowway has a dimension at least as great as the dimension of the flow passage, permits objects such as pigs and scrapers to pass through the valve. For flow controlling activity the rotary valve element defines flow controlling passages in the form of holes or contoured slots which intersect the flowway and the outer peripheral surface thereof and incorporates anti-cavitation and noise abatement trim. The ratio of flow control slot length to flowway diameter is in the range of from 2.0 to 1.0 to 4.0 to 1.0 and is determinative of valve diameter. The noise abatement and anti-cavitation trim may be located at least partially within the flowway as well. The rotary valve element is of sufficient diameter relative to the diameter of the flowway that rotational movement between the fully open and fully closed positions is achieved in about 90.degree.. The flow control valve may also be of the top entry variety, thus permitting it to be repairable while installed in a flow line.
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Daniel Industries Inc.
Nilson Robert G.
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