| 摘要 |
<p>PURPOSE: To generally reduce costs by constituting a selector valve from three molded plastic parts, assembling these parts by a simple fixing means such as a screw, and aligning them without any additional sealing. CONSTITUTION: A gas regulator main body 124 as one component for constituting a selector valve is formed of a plastic material excellent in shock resistance. Inlet and outlet ports 130, 132 are formed on the circular flat surface 128, a switching dial 144 is arranged on this surface so as to be superposed on it, and a central opening 147 provided on the dial 144 is fitted to a strut 140 provided on the main body 124. The dial is rotatable around the strut with the appropriate fit tolerance. Moreover, the dial 144 constitutes a seal in relation to the surface 128 of the main body 124, a plurality of detents 150 are formed on outer surface 148, and the depth and the width are increased from the central part. In assembling a unit, a screw is screwed from a hole 160 of a switching plate 154 into a hole 142.</p> |
