Valve device

A valve device comprising:

• a body having a gas passage and an accommodation hole communicated with the gas passage;
• a solenoid valve accommodated in the accommodation hole;
• and
• a joint member fixed to the body, wherein
• the solenoid valve includes:
• a sleeve having a tubular shape and fitted in the accommodation hole, the sleeve including a passage communicated with the gas passage,
• an opening-closing portion configured to open and close the passage;
• and
• a driving portion configured to drive the opening-closing portion to open and close the passage,
• a seal member is disposed between an outer wall surface of the sleeve and an inner wall surface of the accommodation hole,
• the body has a joint connection opening that is located downstream of the passage of the sleeve, the joint connection opening being opened on an outer surface of the body,
• the joint member is fixedly attached to the joint connection opening,
• the joint member has a communication passage connected to the passage of the sleeve, and
• the joint member includes a backflow reduction valve configured to hinder movement of gas in the communication passage toward the sleeve.