Dual orifice venturi vacuum drawback assemblies having air breather check valve
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United States of America Patent
Stats
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Jun 15, 2021
Grant Date -
Aug 8, 2019
app pub date -
Feb 7, 2019
filing date -
Feb 7, 2018
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A dual orifice venturi vacuum drawback assembly includes a fluid supply passage that supplies fluid to the device, a fluid return passage that returns fluid from the device, a shutoff valve position on the fluid supply passage, a bypass passage, a bypass valve positioned on the bypass passage, and a dual orifice venturi valve. The bypass passage includes an inlet connected to the fluid supply passage upstream of the shutoff valve, and an outlet connected to the fluid return passage. The dual orifice venturi valve is positioned on the bypass passage upstream of the bypass valve. The dual orifice venturi valve includes a venturi inlet, a venturi outlet, a primary orifice, and a secondary orifice. The primary orifice is connected to a primary drawback opening on the fluid return passage. The secondary orifice is connected to a secondary drawback opening on the fluid return passage.
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