Patents Assigned to Tomco
  • Patent number: 3933167
    Abstract: A pilot operated check valve having pressure actuated poppet valves positioned to limit flow in one direction through each of two flow paths through the valve, each poppet valve including a one-way check valve to control reverse flow through the two flow paths and a spool positioned in said valve and being responsive to inlet pressure in one or the other of the flow paths to open the check valve in the opposite fluid flow path when the pressure differential between inlet pressure and return pressure is within a predetermined ratio.
    Type: Grant
    Filed: February 20, 1974
    Date of Patent: January 20, 1976
    Assignee: Tomco, Inc.
    Inventor: James Otto Byers, Jr.