Apparatus for controlling drop-wise flow of fluid material

Details Apparatus for controlling drop-wise flow of fluid material Apparatus for controlling drop-wise flow of fluid material

1982-08-12

1984-06-05

Schwadron, Martin P.

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

604253, F16K 3140

Patent

active

044522738

ABSTRACT:
A flexible tube connected to a drop chamber is closed off by a clamping force applied by a pinch clamp. A cam which presses against the pinch clamp to initiate the drop-wise flow of a fluid forms an electrical contact with an extension of the clamp. Prior to the start of drop-wise feed when the cam and clamp are not in contact, the cam is driven toward the clamp at high speed until contact is made, at which point the drop-wise feed begins. At the instant of contact, a control signal is produced in response to which a speed changeover circuit is actuated to drive the cam at low speed, whereby control is executed in such a manner that the fluid drop rate gradually approaches a set drop rate at the low speed.

REFERENCES:
patent: 3450153 (1969-06-01), Hildebrandt et al.
patent: 3800794 (1974-04-01), Georgi
patent: 4261388 (1981-04-01), Shelton

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