Patents by Inventor Lars A. vall

Lars A. vall has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Switch-over valve, preferably for an air drier
    Patent number: 4781209
    Abstract: A switch-over valve for directing a compressed air flow to either one of two drying towers of an air drier, the other one being vented to the atmosphere. The valve is arranged in a partition wall between the two towers, a conduit to the valve being provided in the partition wall. A valve body is axially movable in a cavity in the wall between two positions sealing off either one of the outlets from the cavity and keeping the other one open. A control piston with a greater length than the valve body is axially movable in a bore in the valve body and is biased towards a neutral position by spring means.
    Type: Grant
    Filed: November 2, 1987
    Date of Patent: November 1, 1988
    Assignee: Garphyttan Haldex AB
    Inventors: Nils A. Nelander, Lars A. vall