Patents Assigned to Irrigation Specialties Company
  • Pop-up sprinkler
    Patent number: 4234125
    Abstract: A long-extension pop-up sprinkler for subsurface installation and irrigation of overlying plantings. A wiper seal or ring at the top of the sprinkler body strips sand and dirt from a riser which retracts when inlet water is turned off, and this seal is water flushed during both extension and retraction of the riser. An internal moving seal at the bottom of the riser isolates the wiper ring from line-pressure water, and enables flushing of the ring during both riser extension and retraction by water trapped within the sprinkler body.
    Type: Grant
    Filed: October 17, 1979
    Date of Patent: November 18, 1980
    Assignee: Irrigation Specialties Company
    Inventor: Calvin A. Lieding
  • Dual-function valve
    Patent number: 4131235
    Abstract: A dual-function valve assembly for an irrigation system typically having a plurality of sprinkler heads disposed at different elevations downstream from a control valve. A spring-loaded check valve prevents drainage of the sprinkler lines through the lower heads when the control valve is closed. A second valve in the assembly closes to prevent excessive flow if a sprinkler head is damaged or removed. The valve assembly is especially useful in unattended, automatically actuated irrigation systems.
    Type: Grant
    Filed: November 1, 1976
    Date of Patent: December 26, 1978
    Assignee: Irrigation Specialties Company
    Inventor: Calvin A. Lieding
  • Irrigation valve with metal seat
    Patent number: 3967808
    Abstract: A diaphragm-type irrigation valve having a molded plastic body, and including a metal valve-seat ring with sidewalls embedded in the plastic body. The seat ring has a generally U-shaped cross-section, at least one ring sidewall being non-parallel to a central axis of the ring. An O-ring seal is positioned within the ring to bear against the plastic material in which the sidewalls are embedded.
    Type: Grant
    Filed: September 22, 1975
    Date of Patent: July 6, 1976
    Assignee: Irrigation Specialties Company
    Inventor: Calvin A. Lieding