Patents Assigned to Twinwood Engineering Ltd
  • Control valve apparatus
    Patent number: 6293309
    Abstract: The invention relates to a control valve apparatus (1) providing reciprocal motion, comprising a spool (2) and sleeve (3), a passage (4) for fluid, which is hydraulic fluid in the embodiment, the passage (4) being openable and closable by the spool (2) and sleeve (3), ports (A, B, C) for fluid, and at least one seal (5, 6), the arrangement being such that a seat of one seal (5) reacts with a seat of another (6) whereby to open the another seal (6).
    Type: Grant
    Filed: April 19, 1999
    Date of Patent: September 25, 2001
    Assignee: Twinwood Engineering Ltd
    Inventor: Kok Yong Lim