Manifold-type solenoid valves

A manifold-type solenoid valve, comprising:

• a manifold holding a plurality of change-over valves on a top portion thereof and having common supply and discharge ducts communicating through the manifold with supply and discharge ports respectively of change-over valve openings in a top portion thereof and a pair of first output openings provided in a front surface of the manifold and individually communicating with a pair of first output ports in each change-over valve through said supply and discharge ducts, each of said change-over valves having said pair of first output ports and a pair of second output ports communicating therewith in a valve body thereof, with the second output ports opening in the top portion of the change-over valves, and a solenoid actuating said valve body and switching communication of the output ports between the supply ports and said discharge ports:
• a first fit-in groove having legs disposed on both sides of the first pair of output openings in the manifold and separated from each other by a distance smaller than a diameter of the first output openings;
• a first substantially U-shaped stopper pin having legs which are inserted into the first fit-in groove and which project into the first output openings;
• and
• one of a pipe fitting and a closing plug which is fitted into the first output openings and having around a periphery thereof an engaging groove with which the legs of the stopper pin are engageable;
• said change-over valve having a second pair of output openings having the same diameter as said first output openings, a second fit-in groove situated on both sides of the second output openings and which have legs;
• a second stopper pin positionable in said second fit-in groove and having legs which are separable from each other by the same distance as that between the legs of the first fit-in groove;
• wherein said one of said pipe fittings and said closing plug are fitted in each of the first and second output openings by using one of said first and second stopper pins wherein the legs thereof are engageable in the engaging grooves around the pipe fittings and closing plugs.