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Class Information
Number: 137/516
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > With means for selecting area of valve or seat
Description: Valves provided with means for selecting one of a plurality of diverse effective areas for the valve by selecting from a plurality of preselected valve elements, i.e., from a plurality of valves or from a plurality of valve seats to vary the responsiveness of the valve.

Patents under this class:

Patent Number Title Of Patent Date Issued
5620026 Fluid controller and improved backflow prevention therefor Apr. 15, 1997
5152140 Pressure compensating valve spool positioned by difference in pressure receiving areas for load and inlet pressures Oct. 6, 1992
4597411 Restriction valve device for hydraulic pressure fluids in vehicle shock absorbing mechanisms Jul. 1, 1986
4370999 Pressure limiting device with two pressure levels for a pressure cooker Feb. 1, 1983

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