| 摘要 |
<p>A spool-type bypass valve is provided for controlling the flow of oil either to a circuit including an oil cooler or to a circuit bypassing the oil cooler. The valve includes an axially shiftable valve spool which is normally operated by an axially extendible and retractable thermostatic element which is in fluid communication with fluid upstream from the cooler and responsive to the temperature thereof to shift the valve spool between first and second positions for respectively directing fluid to the cooler circuit or to a reservoir. A pilot pressure circuit is connected to the valve spool to act in opposition to the thermostatic element so as to override the latter to cause fluid to be directed to the reservoir when the pressure of the fluid upstream from the cooler reaches an abnormally high value indicative of a condition such as would occur in the event that the oil cooler circuit became clogged.</p> |
