FLOW PATH SWITCH CONTROL DEVICE
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United States of America Patent
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N/A
Issued Date -
May 5, 2011
app pub date -
Jul 6, 2010
filing date -
Nov 1, 2009
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
Disclosed herein is a flow path switch control device used in a control system such as HVAC, refrigeration system and the like. In the prior art, since the pressure at an upper portion of a piston will drop instantaneously at the moment when a pilot valve is opened and closed, a large pressure difference is formed between the upper and lower sides of a piston to drive the piston to move, which results in a strong impact between a piston stopping member and the piston. Therefore, the life span of a product and the operating stability of the system will be affected. The flow path switch control device of the present invention includes a fluid inlet, a fluid outlet, a valve device arranged between the fluid inlet and the fluid outlet, and a pressure balancing control circuit. An adjusting device is provided in the pressure balancing control circuit to reduce a pressure change in fluid passing through the pressure balancing control circuit when the flow path switch control device is opened/closed, which enables the flow path switch control device to be smooth during the process of opening or closing, and thus avoid the problem of strong vibration and noise occurred at the moment when the solenoid switch is operated under large pressure difference.
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