Abstract: In a spool-type switching valve in which a recessed groove in which a packing is mounted is provided at a land portion of a spool, a groove bottom of the recessed groove is formed of an inclined surface that has an axial length half or larger than the length of the groove bottom in the direction of an axis and that continuously decreases in diameter from an upstream end to a downstream end, the inner periphery of the packing is brought into pressure-contact with the groove bottom with stress concentration at a pressure contact point that defines an upstream end of the inclined surface, and an angle ? that a connection surface connecting the pressure contact point on the groove bottom and the upstream end forms with the axis is within the range of 0°????, where ? is an angle that the inclined surface forms with the axis.

Abstract: A manifold includes multiple first valve mount portions, on each of which three electromagnetic valves are arranged side by side, or a plurality of second valve mount portions, on each of which two electromagnetic valves are arranged side by side, or includes at least one of the first valve mount portions and at least one of the second valve mount portions. Waterproof covers are attached to the valve mount portions of the manifold to each cover the three or two electromagnetic valves mounted on the valve mount portion. Thus, a waterproof manifold electromagnetic valve is formed.

Abstract: In a spool-type switching valve in which a recessed groove in which a packing is mounted is provided at a land portion of a spool, a groove bottom of the recessed groove is formed of an inclined surface that has an axial length half or larger than the length of the groove bottom in the direction of an axis and that continuously decreases in diameter from an upstream end to a downstream end, the inner periphery of the packing is brought into pressure-contact with the groove bottom with stress concentration at a pressure contact point that defines an upstream end of the inclined surface, and an angle ? that a connection surface connecting the pressure contact point on the groove bottom and the upstream end forms with the axis is within the range of 0°????, where ? is an angle that the inclined surface forms with the axis.

Abstract: A manifold block is provided with attachment grooves for attaching silencer members and a plurality of individual exhaust paths that are branched from the attachment grooves and open on fixing regions of a valve mounting surface. Openings along the axes of the attachment grooves are formed as exhaust ports in lightening grooves on the bottom surface of the manifold block. The silencer members are held in the attachment grooves. The individual exhaust paths communicate with the exhaust ports through the silencer members.

Abstract: A sealing structure is configured in the following manner. When a packing having a pair of sealing portions formed at opposite edge portions of the outer peripheral surface thereof is installed in a land portion of a spool, the outside diameter of the packing is made smaller than the diameter of a slide surface of a spool hole. In a state in which the outer periphery of the land portion opposes the slide surface and a pressurized fluid is supplied from a gas supply channel to the first space of first and second spaces that are partitioned by the land portion, the edge portion of the packing positioned near the first space is elastically elongated in a radial direction due to pressure of the pressurized fluid and thereby narrows a gap formed between the first sealing portion and the slide surface of the spool hole or abuts the slide surface.

Abstract: Main channels are provided in a base body so as to pass through the base body in a direction of arranging valve mounting regions in a row. In addition, communicating openings are also provided in the base body so as to allow the main channels to communicate with a valve mounting surface that is the top surface of the base body. The communicating openings open at the valve mounting surface so as to cross the valve mounting regions, and silencers is installed in respective communicating openings so as to extend in the longitudinal direction of the communicating openings.

Abstract: An integrated multiple valve manifold that is reduced in size and weight by integrally incorporating a plurality of valve mechanisms in one manifold. The one manifold, which is formed of an extruded material through which a fluid supply hole and fluid discharge holes extend, includes a plurality of valve holes each of which communicates with the fluid supply hole and the fluid discharge holes by directly intersecting both of the fluid supply hole and the fluid discharge holes, output ports that are formed so as to individually communicate with the valve holes, spools that are slidably inserted into the valve holes, and electromagnetic pilot valves that are individually attached to one ends or both ends of the valve holes.

Abstract: A manifold block is provided with attachment grooves for attaching silencer members and a plurality of individual exhaust paths that are branched from the attachment grooves and open on fixing regions of a valve mounting surface. Openings along the axes of the attachment grooves are formed as exhaust ports in lightening grooves on the bottom surface of the manifold block. The silencer members are held in the attachment grooves. The individual exhaust paths communicate with the exhaust ports through the silencer members.

Abstract: [Object] There is provided a manifold base and a manifold-type electromagnetic valve that uses the manifold base, wherein a silencer for attenuating exhaust noise of solenoid valves is embedded in a base body, thereby enabling streamlined designing of the base body. [Solution] Main channels 9a and 9b are provided in a base body 2 so as to pass through the base body 2 in a direction of arranging valve mounting regions 3 in a row. In addition, communicating openings 10a and 10b are also provided in the base body 2 so as to allow the main channels 9a and 9b to communicate with a valve mounting surface 2A that is the top surface of the base body 2. The communicating openings 10a and 10b open at the valve mounting surface 2A so as to cross the valve mounting regions 3, and silencers 50 is installed in respective communicating openings 10a and 10b so as to extend in the longitudinal direction of the communicating openings 10a and 10b.

Abstract: A manifold includes multiple first valve mount portions, on each of which three electromagnetic valves are arranged side by side, or a plurality of second valve mount portions, on each of which two electromagnetic valves are arranged side by side, or includes at least one of the first valve mount portions and at least one of the second valve mount portions. Waterproof covers are attached to the valve mount portions of the manifold to each cover the three or two electromagnetic valves mounted on the valve mount portion. Thus, a waterproof manifold electromagnetic valve is formed.

Abstract: First and second insertion holes and first and second recessed grooves are formed such that, on a plane that is perpendicular to a first side surface and a second side surface and that includes an axis of a spool-sliding hole, the shortest distance from the axis of the spool-sliding hole to a hole wall surface of the first insertion hole, the shortest distance from the axis of the spool-sliding hole to a hole wall surface of the second insertion hole, the distance from the axis of the spool-sliding hole to a bottom wall surface of the first recessed groove, and the distance from the axis of the spool-sliding hole to a bottom wall surface of the second recessed groove are equal to one another.

Abstract: The cross-sectional shape of a valve hole is an elongated shape having a long axis and a short axis, and has left and right hole side walls that are parallel to each other, a first hole end wall that connects one ends of the left and right hole side walls, and a second hole end wall that connects the other ends of the left and right hole side walls, and the cross-sectional shape of land portions of a spool is an elongated shape having a long axis and a short axis, and has left and right land side walls that are parallel to each other, a first land end wall that connects one ends of the left and right land side walls, and a second land end wall that connects the other ends of the left and right land side walls.

Abstract: [Object] To provide a compact, rationally designed, dual 4-port electromagnetic valve that is an electromagnetic valve having functions of two 4-port valves.