Resources Contact Us Home
Browse by Category: Main > Engineering
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

  Recently Added Patents
Block polymers and their process of preparation
Etching composition
Antenna device and wireless communication apparatus
Lubricating oil compositions
Method of analyzing cell structures and their components
Gas cap removal tool
Method and apparatus for determining storage capacity error for a data storage device
  Randomly Featured Patents
Photochemical labelling of nucleic acids with digoxigenin reagents and their use in gene probe test systems
Alumina sintered products and process for their production
Electrolytic reduction of dihydrobenzopyranoxanthenones
Candy holder and candy feeding device
Method and device for automated palletizing of packages
Programmable logic array integrated circuit incorporating a first-in first-out memory
Ear covering and manufacturing method
Voltage level shifting device
System and method for synthetic commodity and synthetic legal tender creation