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Class Information
Number: 137/105
Name: Fluid handling > Self-proportioning or correlating systems > Supply and exhaust type > Vacuum or suction pulsator type (e.g., milking machine) > With pulsation responsive pilot valve
Description: Apparatus wherein the flow controlling valve is moved by a fluid servo under control of a second valve which is itself fluid operated under control of the first valve, there being no mechanical linkage between the two valves.

Patents under this class:

Patent Number Title Of Patent Date Issued
7139219 Hydraulic impulse generator and frequency sweep mechanism for borehole applications Nov. 21, 2006
6161580 Pulsator Dec. 19, 2000

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