WE CLAIM:
[Claim 1]
A manifold base for mounting plurality of solenoid valves thereon in an arranged manner, the manifold base comprising:
a base body having
a valve mounting surface on which multiple valve mounting regions for mounting the solenoid valves thereon are arranged in a row,
an air supply channel through which compressed air is supplied to the solenoid valves, and
an air discharge channel through which air discharged from the solenoid valves is discharged to outside; and
a silencer that attenuates exhaust noise of the discharged air, wherein
the air discharge channel is constituted by
a main channel that passes through inside the base body in a direction of arranging the valve mounting regions in the row, and
a communicating opening that opens at the valve mounting surface and enable the main channel to communicate with the valve mounting regions, and
the silencer is installed inside the communicating opening. [Claim 2]
The manifold base according to Claim 1, wherein
the communicating opening is formed as an elongated groove extending along the main channel, and
the silencer is formed into a square bar made of a porous noise reduction material having air permeability. [Claim 3]
The manifold base according to Claim 2, wherein
the communicating opening is formed so as to successively cross all of the

valve mounting regions, and
the silencer is accommodated inside the communicating opening in such a manner that the silencer successively crosses all of the valve mounting regions. [Claim 4]
The manifold base according to Claim 2, wherein
a support groove is formed at a bottom of the main channel at a position opposing the communicating opening, and
the silencer has a bottom portion installed inside the support groove. [Claim 5]
The manifold base according to Claim 4, wherein
the support groove is formed between a pair of support walls that stand on a bottom wall of the main channel and that extend parallel to each other. [Claim 6]
The manifold base according to Claim 1, wherein
the air supply channel is constituted by
a main air supply channel through which compressed air to be supplied to the solenoid valves is simultaneously circulated and
multiple branched air supply channels that are branched from the main air supply channel and that open at the valve mounting surface, and
the main air supply channel passes through inside the base body so as to extend parallel to the air discharge channel. [Claim 7]
The manifold base according to Claim 6, wherein two air discharge channels are disposed in both side regions of the main air supply channel, respectively. [Claim 8]
A manifold-type electromagnetic valve comprising-
the manifold base according to Claim 1, and

solenoid valves mounted on respective valve mounting regions of the valve mounting surface of the manifold base.