Abstract: A valve device includes a body in which a gas flow passage is provided; and a check valve provided in the gas flow passage, the check valve including a poppet and a valve seat. The poppet excluding a block portion is in a form of a hollow shaft, the block portion being located at a distal end of the poppet and having a taper shape, and the poppet has at least one side hole that provides communication between an inside and an outside of a portion of the poppet, the portion being in the form of the hollow shaft. The at least one side hole extends obliquely with respect to a central axis line of the poppet such that the at least one side hole extends along a gas flow direction inclined with respect to a direction in which the poppet moves when the check valve opens.

Abstract: The pressure reduction valve includes: a cylindrical portion, a piston and a spring. The cylindrical portion includes an inlet communicating with the primary side flow path and an outlet communicating with the secondary side flow path. The piston fitted into the cylindrical portion is slidable along an axis direction of the cylindrical portion within the cylindrical portion, and defines, within the cylindrical portion, a space communicating with the inlet and the outlet. The spring applies, to the piston, a force acting toward the space. The outlet is displaced in one direction from the center of the piston when seen in the axis direction. The force applied to the piston by the spring is distributed so as to deviate from the center of the piston to the side of the outlet.

Abstract: A valve element of a pressure reducing valve includes a taper portion seated on an inner periphery of a valve hole that includes a first area, a second area and a third area in order from an upstream side. The first area is provided such that, when the valve element is open, the height of a passage defined between the first area and the taper portion gradually reduces toward a downstream side. The second area is provided such that the height of a passage defined between the second area and the taper portion is constant when the valve element is open and the entire second area contacts the taper portion when the valve element is closed. The third area is provided such that, when the valve element is open, the height of a passage defined between the third area and the taper portion gradually increases toward the downstream side.

Abstract: A pressure reducer includes a piston slidably accommodated in a cylinder to define a decompression chamber and a pressure adjusting chamber. A seal member includes an elastic member and a sliding portion. The sliding portion is pressed by the elastic member such that the sliding portion slides on an inner circumferential surface of the cylinder. An annular member is located on an outer circumferential surface of the piston and between the seal member and the pressure adjusting surface. The annular member is pressed against the inner circumferential surface of the cylinder with a force that is less than a force with which the sliding portion is pressed against the inner circumferential surface of the cylinder. Thus, the pressure reducer prevents the piston from being moved by an excessive amount with highly accurately adjusting pressure.

Abstract: The pressure reduction valve includes: a cylindrical portion, a piston and a spring. The cylindrical portion includes an inlet communicating with the primary side flow path and an outlet communicating with the secondary side flow path. The piston fitted into the cylindrical portion is slidable along an axis direction of the cylindrical portion within the cylindrical portion, and defines, within the cylindrical portion, a space communicating with the inlet and the outlet. The spring applies, to the piston, a force acting toward the space. The outlet is displaced in one direction from the center of the piston when seen in the axis direction. The force applied to the piston by the spring is distributed so as to deviate from the center of the piston to the side of the outlet.

Abstract: A valve element of a pressure reducing valve includes a taper portion seated on an inner periphery of a valve hole that includes a first area, a second area and a third area in order from an upstream side. The first area is provided such that, when the valve element is open, the height of a passage defined between the first area and the taper portion gradually reduces toward a downstream side. The second area is provided such that the height of a passage defined between the second area and the taper portion is constant when the valve element is open and the entire second area contacts the taper portion when the valve element is closed. The third area is provided such that, when the valve element is open, the height of a passage defined between the third area and the taper portion gradually increases toward the downstream side.

Abstract: A valve device includes a body in which a gas flow passage is provided; and a check valve provided in the gas flow passage, the check valve including a poppet and a valve seat. The poppet excluding a block portion is in a form of a hollow shaft, the block portion being located at a distal end of the poppet and having a taper shape, and the poppet has at least one side hole that provides communication between an inside and an outside of a portion of the poppet, the portion being in the form of the hollow shaft. The at least one side hole extends obliquely with respect to a central axis line of the poppet such that the at least one side hole extends along a gas flow direction inclined with respect to a direction in which the poppet moves when the check valve opens.

Abstract: In a valve device for selectively opening and closing a flow passage formed to open on a valve seat by a valve body through a resin-made seat, a hollow portion is formed on either one of the valve body and the valve seat and receives the resin-made seat therein, the resin-made seat has a thickness so that the resin-made seat partly protrudes from the hollow portion, and when the valve body is operated to close the flow passage, the resin-made seat is compressed to bring an end surface of the valve body into contact with the valve seat.

Abstract: A valve device includes: a valve member that controls flow of a fluid, and a body that has a valve insertion hole in which the valve member is inserted, and whose inner surface is cylindrically formed, and into which the fluid flows, and a lead-in passage that has an opening in the inner surface of the valve insertion hole, and that causes the fluid to flow into the valve insertion hole. A line representing the direction of extension of the lead-in passage is tilted from a line normal to the inner surface of the valve insertion hole at a position of the opening of the lead-in passage, in a view in the axis direction of the valve insertion hole.

Abstract: A valve device is installed on a gas tank and opens and closes a gas filling passage. The valve device includes: a housing having a housing portion therein; a first check valve that is fixed to the housing and has a through hole, through which the housing portion and the filling passage communicate with each other; and a valve pressing member. The housing has a filling port, through which the outside and the housing portion communicate with each other. The housing portion contains a filter, disposed between the filling port of the housing and the through hole of a passage member, and a valve element that is moved between the filter and the filling port by the flow of gas. When the gas in the gas tank flows into the housing portion, the valve element moved toward the filling port seats on a valve seat and closes the filling port.

Abstract: An object is to provide a fuel cell system having a simple structure, which is capable of supplying gas appropriately through an ejector in accordance with the load of a fuel cell. The fuel cell system (1) uses an ejector (24) disposed in a gas supply system (4) to combine a new gas to be supplied to the fuel cell (2) with an off-gas discharged from the fuel cell (2) and supply the fuel cell (2) with the resulting combined gas. The ejector (24) includes a nozzle (46) for ejecting the new gas and generating a negative pressure for aspirating the off-gas, and a flow rate control mechanism (47) for controlling the flow rate of the new gas which passes through the nozzle (46). A first flow path (81) for leading the off-gas to the flow rate control mechanism (47) is provided in the gas supply system (4), and the flow rate control mechanism (47) controls the flow rate of the new gas in accordance with the pressure of the off-gas led from the first flow path (81).

Abstract: A fluid supply valve attachment device that has a tank, a fixing member in which a recessed fitting section is formed, a fluid supply valve that is inserted in and fixed to the recessed fitting section, a first seal member which seals a space between the tank and the fixing member, and a second seal member which seals a space between the fixing member and the fluid supply valve. The maximum inside diameter of the recessed fitting section is defined as D, a distance between a cross-sectional center of the first seal member and a cross-sectional center of the second seal member in a direction that a central axial line of the recessed fitting section extends in an attached state is defined as L1, and L1 is set within 2.5×D.

Abstract: A plug body housing 16 has a receiving recess 17, and the receiving recess 17 includes a first recess 21 opening toward the outside and a second recess 22 connected to the first recess 21. Check valves 8 and 9 are provided in the second recess 22, and a manual valve 14 is provided in the first recess 21. An internal threaded portion 45 is formed in an inner circumferential surface of the first recess 21, and a housing 35 of the manual valve 14 is threaded into the internal threaded portion 45. The check valves 8 and 9 are held between a bottom surface 22a of the second recess 22 and a bottom 35a of the housing 35 so that the check valves 8 and 9 are secured in the second recess 22.

Abstract: A valve device includes: a valve housing defining a cylindrical space connected to a high-pressure source, and having a first communication hole open at a valve seat located at a bottom portion of the valve housing and providing fluid communication between the cylindrical space and a low-pressure source; a seal member arranged in the cylindrical space and providing or shutting off fluid communication between the high-pressure and low-pressure sources so that the seal member moves away from or contacts the valve seat; and a stem having an accommodating recess at one end of the stem and moved axially. The seal member is fitted and held in the accommodating recess. The seal member has a second communication hole that provides fluid communication between a bottom face of the accommodating recess and the low-pressure source when the seal member is in contact with the valve seat.

Abstract: An annular mating portion extends from a fastening surface of a fastening nut. The mating portion has an inner diameter set to be substantially equal to an outer diameter of the portion of a piston in which an accommodating groove is formed. In a state in which the mating portion is inserted into the accommodating groove, and an inner circumferential surface of the mating portion slides in contact with a circumferential wall of the accommodating groove, the fastening nut is mated with a threaded portion, and a lip seal is held between the mating portion and the accommodating groove. This fixes the lip seal to the piston.

Abstract: A pressure reducing valve (10) includes: a valve unit (18) provided between a primary port (32) and a secondary port (34); a cylinder (12) provided downstream of the valve unit (18); a piston (14) that divides a space in the cylinder (12) into a pressure reducing chamber (38) and a pressure regulation chamber (96) and that opens or closes the valve unit 18 by sliding within the cylinder (12); and a seal member (24) that is disposed in an inner peripheral face of the cylinder (12) and that includes a slidably contacting piece (26a) that slidably contacts the piston (14) due to the pressing force of an elastic member (28). The cylinder (12) is formed of a body member (20) that defines the pressure reducing chamber (38) and a cover member (22) that defines the pressure regulation chamber (96). An annular groove (94) in which the first seal member (24) is disposed is formed at the boundary between the body member (20) and the cover member (22).

Abstract: A restriction plate is arranged at a position that is apart from a female screw portion by a distance shorter than a length of a portion of a male screw portion of an operation screw, which is screwed into a female screw portion of a plug body housing, along the axial direction in the valve-closed state. Therefore, when the operation screw is unscrewed, the operation screw contacts the restriction plate before the operation screw is completely unscrewed from the plug body housing.

Abstract: A valve device is installed on a gas tank and opens and closes a gas filling passage. The valve device includes: a housing having a housing portion therein; a first check valve that is fixed to the housing and has a through hole, through which the housing portion and the filling passage communicate with each other; and a valve pressing member. The housing has a filling port, through which the outside and the housing portion communicate with each other. The housing portion contains a filter, disposed between the filling port of the housing and the through hole of a passage member, and a valve element that is moved between the filter and the filling port by the flow of gas. When the gas in the gas tank flows into the housing portion, the valve element moved toward the filling port seats on a valve seat and closes the filling port.

Abstract: A valve device of a high-pressure tank for a vehicle has a valve box that is attached to the high-pressure tank and that houses a gas inlet opening, a gas outlet opening, a flow path connecting the gas inlet opening, the gas outlet opening and the high-pressure tank, and a valve disposed on the flow path. The gas inlet opening, the gas outlet opening, at least a portion of the flow path, and the valve are provided on a plane that intersects perpendicularly with an axis direction of the high-pressure tank.

Abstract: A valve device includes: a valve member that controls flow of a fluid, and a body that has a valve insertion hole in which the valve member is inserted, and whose inner surface is cylindrically formed, and into which the fluid flows, and a lead-in passage that has an opening in the inner surface of the valve insertion hole, and that causes the fluid to flow into the valve insertion hole. A line representing the direction of extension of the lead-in passage is tilted from a line normal to the inner surface of the valve insertion hole at a position of the opening of the lead-in passage, in a view in the axis direction of the valve insertion hole.