DETAILED DESCRIPTION What I claim is: 1.
A water-gas suppressor for internal-combustion engines, the latter including a carburetor (13), a combustion chamber and an exhaust pipe (6); the suppressor comprising, in combination, a water tank (1); a regulator (3) for adjusting the flow of the water supplied from said tank by an adjusting valve (24) operated by negative pressure generated by said carburetor; a steam generator (7) for evaporating the water, that is supplied from said regulator, by the heat of said exhaust pipe in a sealed space (31); and a steam buffer (9) provided between said generator and an air cleaner (10), for leading only the pure steam generated in said generator into said air cleaner; wherein said generator has attached thereto a conduit (5) and a steam tube (8) which both lead to said sealed space, respectively from said water tank by way of said regulator, and from said air cleaner by way of said steam buffer; said conduit leads to a short tube (36), one end of which forms an aperture (38) of a small diameter while its other end leads to the bottom of said sealed space; and said steam tube leads to another short tube (39), one end of which, of a larger diameter than that of the first-named short tube, leads to the top of said sealed space.
2.
The waste-gas suppressor as defined in claim 1, wherein said valve (24) is made of elastic materials, and includes a circular flat part (24a) of a thin film, a conical projecting part (24b) of slight thickness, forming a hollow part (24d) substantially in the center of said flat part, and a ring-shaped peripheral part (24c) formed around said flat part.
3.
The waste-gas suppressor as defined in claim 1, wherein said regulator (3) includes a casing (18, 19) having an opening therein, a plate (26) fixed in said opening, said valve (24) being sealed tightly between said casing and said plate.
4.
The waste-gas suppressor as defined in claim 3, wherein said regulator (3) further includes a chest (21, 30) formed between said casing (18, 19) and said valve (24), and a space formed between said valve and said plate (26) for receiving the negative pressure, said chest being opened and closed by the operation of said valve
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Semiconductor manufacture 
