Safety valve assembly
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 24, 2001
Grant Date -
N/A
app pub date -
Feb 15, 2000
filing date -
Feb 19, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A main valve (5) has a first valve seat (11) to which a compression spring (21) urges a first closure member (14). A restricting passage (16) and an actuation chamber (17) for valve closing are arranged within the first closure member (14) in order. A valve-opening holding chamber (25) is formed from an inner space defined by a fitting wall (23) with which the first closure member (14) fits at a final time of its closing movement. The actuation chamber (17) communicates with a second valve seat (31) of a pilot valve (6). A pushing spring (37) brings a second closure member (34) into closing contact with the second valve seat (31). The second valve seat (31), the first valve seat (11), the actuation chamber (17) and the valve-opening holding chamber (25) have respective sectional areas (S), (T), (U) and (V) set to values enlarging one after the other in the mentioned order.
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