THERMOSTATIC BYPASS VALVE

摘要

A thermostatic bypass valve functions to regulate fluid temperature and also to act as a pressure relief valve using a single valve bore. The poppet valve includes a cylinder with a chamber that is thermally immersed in a source passageway such that the valve state is determined by the temperature of the fluid flowing through the source passageway as opposed to the fluid flowing through a return passageway. When the fluid in the source passageway is hot, a poppet is forced against the return passageway side of a valve seat. The poppet may either be rigidly attached to the cylinder or may slide with respect to the cylinder and be forced against the valve seat by a spring. A piston may either be rigidly attached to the housing or may be forced toward the valve seat by a spring.

主权项

1. A transmission system comprising:
a heat exchanger having a fluid loop with an inlet and an outlet; a housing defining a source passageway between a source of pressurized fluid and the inlet, a return passageway between the outlet and a transmission lubrication circuit, and a bypass passageway between the source passageway and the return passageway; and a poppet valve disposed within the bypass passageway and configured to i) permit flow through the bypass passageway when a temperature in the source passageway is less than a predefined temperature, ii) permit flow through the bypass passageway when a pressure difference between the source passageway and the return passageway exceeds a predefined value, and iii) block flow through the bypass passageway when the temperature in the source passageway exceeds the predefined temperature and the pressure difference is less than the predefined value.