Valves and valve actuation – With means to increase head and seat contact pressure – Gate valve
Reexamination Certificate
2006-08-07
2010-10-26
Fristoe, Jr., John K (Department: 3753)
Valves and valve actuation
With means to increase head and seat contact pressure
Gate valve
C251S193000, C251S326000
Reexamination Certificate
active
07819384
ABSTRACT:
A movable member is fitted in the middle in the vertical direction of a valve body core fitting that forms a gate valve body, and the movable member presses an elastic seal member from the inside of the seal member toward a tube inner wall surface located in a direction crossing the direction of insertion of the seal member. The movable member has arms and contact sections. The arms each have a second inclined section for pressing the elastic seal member against the tube inner wall surface upon receiving pressing action from a first inclined section that is formed on a pressing member and changes the direction of pressing. The contact sections are in contact with and press the inside of the elastic seal member. The contact sections of the movable member have recesses having inside the elastic seal member.
REFERENCES:
patent: 6283446 (2001-09-01), Sato et al.
patent: 6893001 (2005-05-01), Maenishi
patent: 7073776 (2006-07-01), Mori
patent: 2003/0222237 (2003-12-01), Maenishi
patent: 2 536 496 (1984-05-01), None
patent: 59-81857 (1984-06-01), None
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patent: 7-167314 (1995-07-01), None
patent: 2003-343748 (2003-12-01), None
Office Action issued by Japanese Patent Office dated Jun. 24, 2010 for counterpart Japanese Patent Application No. 2005-231677.
Asai Hisakazu
Nakano Kiyoharu
Shimizu Haruhiko
Fristoe, Jr. John K
Knobbe Martens Olson & Bear LLP
Waterworks Technology Development Organization
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