Restarting device of a pump change-over valve which induces a pressure difference within the pump change-over valve to remove the latter from an intermediate stalled position
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United States of America Patent
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-
Sep 16, 2003
Grant Date -
Jul 25, 2002
app pub date -
Jan 22, 2002
filing date -
Jan 23, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A restarting device of a pump change-over valve in a pump is provided, in which the pump includes; a pump main body 1 and a change-over valve 2. The change-over valve 2 is provided with a pair of pressure chambers 31 and 32 formed at respective ends on the back face sides of a valve body 23. The driving fluid is supplied into the chambers to induce a pressure difference to switch the direction of movement of the valve body 23. Also, the pump main body 1 is provided with a balancing valve 49 whose end portions 49A and 49B face driving chambers 4A and 5A, respectively. If the change-over valve 2 malfunctions and the pressures in the two driving chambers 4B and 5B are balanced, the balancing valve 49 is held in an intermediate position and will then induce a pressure difference between the two pressure chambers 31 and 32.
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