Caterpillar Inc.

Shin Caterpillar Mitsubishi Ltd.

Yun Guo

Pengfei Ma

Xinyu Ge

Aleksandar M Egelja

Mark Vonderwell

Mikhall A Sorokine

An emission reduction system is provided. The emission reduction system includes a tank configured to store a reductant. The emission reduction system also includes a pump configured to draw the reductant from the tank and supply the reductant to an exhaust system. The pump is further configured to draw in air from an ambient air source. The emission reduction system further includes a control assembly disposed in fluid communication with the ambient air source and the pump. The control assembly is configured to selectively allow the pump to access the ambient air source for purging the pump.

Emission reduction system

A valve for a fluid circuit is disclosed. The valve has a main valve element with a first end and a second end. The main valve element is movable between a flow-passing and a flow-blocking position in response to fluid pressure exerted on the first and second ends. The valve also has a solenoid mechanism operatively associated with the main valve element to move the main valve element toward one of the flow-passing and the flow-blocking positions. The valve further has a main valve spring configured to bias the main valve element in opposition to movement caused by the solenoid mechanism. The valve additionally has a relief valve element configured to communicate a fluid with the first end of the main valve element in response to a fluid pressure to initiate movement of the main valve element.

Electronically and hydraulically-actuated drain value

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Peoria, IL, United States of America

Yun Guo