Patent ID: 9482221
Filing Date: 2016-11-01
CPC Classification: F04B

Claim Text:
1. A gas control apparatus comprising: a housing including an introduction hole and a discharge hole; a first check valve and a second check valve that are disposed between the introduction hole and the discharge hole and configured to block flow of gas from the discharge hole to the introduction hole; a first pump including a suction hole connected to the introduction hole and an ejection hole connected to the second check valve; a second pump including a suction hole connected to the first check valve and an ejection hole connected to the discharge hole; and a directional control valve disposed between the ejection hole of the first pump and the suction hole of the second pump; wherein the first check valve, the second check valve, the first pump, the second pump, and the directional control valve are disposed in the housing; the directional control valve includes a first diaphragm, first and second valve chests partitioned from each other by the first diaphragm, and a first valve seat disposed in the first valve chest; the first diaphragm includes first and second opposed principal surfaces and a region in which the first diaphragm contacts the first valve seat; the first valve seat includes an opening connected to the suction hole of the second pump; the first valve chest is connected to the ejection hole of the first pump; and the directional control valve is configured to switch a state of connection between the first pump ejection hole and the suction hole of the second pump between connected and disconnected states in accordance with a difference between forces applied to both of the first and second principal surfaces of the first diaphragm.