Abstract: In a fuel gas circulation apparatus, a diffuser is accommodated in an attachment hole of a body. An injector is provided upstream of the diffuser through an attachment. A vibration absorption member made of elastic material is provided between a proximal end of a large diameter portion of this diffuser and a distal end of a main body in the attachment, and a ring member is provided adjacent to the vibration absorption member.

Abstract: A solenoid valve includes a body having a flow channel, and a solenoid part coupled to the body. The solenoid part includes a core housing. A movable core can be accommodated inside the core housing. A flange part of the core housing is expanded radially outwardly from a guide part which guides the movable core. Further, a thick portion is provided at a boundary portion between the flange part and the guide part on a core part side. The thick portion becomes gradually thick toward the guide part.

Abstract: A hydrogen injection apparatus has an injector attached to an attachment hole of a body. The injector can inject hydrogen. A mounting member made of metal is provided on the outer circumferential side of the injector. An annular elastic member is provided in contact with a base of the mounting member. At the time of mounting the injector to the attachment hole, an elastic member and the mounting member are assembled in a manner that the elastic member and the mounting member are accommodated in a support base of an attachment provided at an opening of the attachment hole.

Abstract: In a valve apparatus, an annular contact portion made of elastic material is provided on a valve portion of a valve plug. A plurality of annular grooves are formed on a proximal end surface of a valve seat member which abuts against the contact portion. The annular grooves are formed around a communication hole through which fluid flows. The annular grooves have different diameters, and are concentric with one another.

Abstract: In a valve apparatus, an annular contact portion made of elastic material is provided on a valve portion of a valve plug. A plurality of annular grooves are formed on a proximal end surface of a valve seat member which abuts against the contact portion. The annular grooves are formed around a communication hole through which fluid flows. The annular grooves have different diameters, and are concentric with one another.

Abstract: A solenoid valve includes a body having a flow channel, and a solenoid part coupled to the body. The solenoid part includes a core housing. A movable core can be accommodated inside the core housing. A flange part of the core housing is expanded radially outwardly from a guide part which guides the movable core. Further, a thick portion is provided at a boundary portion between the flange part and the guide part on a core part side. The thick portion becomes gradually thick toward the guide part.

Abstract: In a fuel gas circulation apparatus, an injector for injecting a fuel gas is inserted into an attachment hole of a body. A cylindrical nozzle is provided integrally with a distal end of the injector. A diffuser is provided downstream of the injector. The diffuser mixes a redundant fuel cell and the injected fuel gas. Connection channels are formed at the proximal end of the diffuser for circulation of the off gas. A reduced diameter portion having the reduced flow channel diameter is formed downstream of a chamber where the connection channels are provided. A nozzle injection hole at the distal end of the nozzle is positioned to face, and coaxially with the reduced diameter portion to circulate the off gas toward a fuel cell stack under operation of the negative pressure generated by the diffuser.

Abstract: A hydrogen injection apparatus has an injector attached to an attachment hole of a body. The injector can inject hydrogen. A mounting member made of metal is provided on the outer circumferential side of the injector. An annular elastic member is provided in contact with a base of the mounting member. At the time of mounting the injector to the attachment hole, an elastic member and the mounting member are assembled in a manner that the elastic member and the mounting member are accommodated in a support base of an attachment provided at an opening of the attachment hole.

Abstract: In a fuel gas circulation apparatus, a diffuser is accommodated in an attachment hole of a body. An injector is provided upstream of the diffuser through an attachment. A vibration absorption member made of elastic material is provided between a proximal end of a large diameter portion of this diffuser and a distal end of a main body in the attachment, and a ring member is provided adjacent to the vibration absorption member.