Appeal No. 1997-4117
Application No. 08/344,746
expanded annular chamber. The piston has a centrally located
metering port 46 and a plurality of fluted channels [47]
formed in the outer periphery thereof. The bottom of each
channel [47] is shown as having a curved or concave surface.
See Figure 3 and col. 4, lines 16-63.
Golestan describes an automatic flow control valve [10]
including a valve body [20] and a piston [16]. The valve body
[20] has a longitudinal bore [18] defining a first flow
passage [32] and a second flow passage [28] defined by a side
wall [68] and an end wall [70] (see Fig. 2). The side wall
[68] has at least one longitudinal flow channel or slot [24]
with a first orifice [26] extending therethrough. The piston
[16] is slidably disposed within the bore [18] to vary the
flow area of a fluid flow through the control valve [10]. The
piston [16] preferably slides within the longitudinal bore
[18] to vary the flow area of the first flow passage [32] such
that the fluid flow through the control valve [10] is
substantially constant over a selected
range of pressure differentials across the control valve [10].
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