Composite-action butterfly valve
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 28, 1999
Grant Date -
N/A
app pub date -
Aug 12, 1998
filing date -
Nov 13, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In the valve, a valve element (4) is supported on a valve element operating shaft (7) by a fixed-length support means (5) and a variable-length support means (6) connected to its back surface opposite the front surface facing a valve seat (3). The fixed-length support means (5) has an arm (5a) of a fixed length pivotally connected to the valve element (4) and mounted for turning on the valve element operating shaft (7), and the variable-length support means (6) of a variable length comprises an elastic member (6a) acting to reduce the distance between the opposite ends of the variable-length support means (6), a transmission mechanism for converting the torque of the valve element operating shaft (7) into a force to increase the distance between the opposite ends of the variable-length support means (6), and a stopper (6f) for limiting the range of variation of the distance between the opposite ends of the variable-length support means (6). An external torque is applied to the valve element operating shaft (7) to operate the valve element (4).
First Claim
Other Claims data not available
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
- 7 Citation Count
- F16K Class
- 3.48 % this patent is cited more than
- 26 Age