Pressure switch

A pressure switch comprising:

• a casing equipped with an introduction port for enabling a fluid to be introduced therein;
• a piston accommodated for sliding movement in a chamber which is formed in the interior of the casing and which communicates with the introduction port;
• an elastic member for elastically applying a force to one surface of the piston;
• an elasticity adjusting means for variably adjusting an elastic force applied by the elastic member to the one surface;
• a swivel plate which is engaged with the elasticity adjusting means and on which the elastic member is seated;
• and
• a detecting means for detecting a pressure of the fluid based on displacement of the piston upon receiving the pressure from the fluid introduced and directed from the introduction port,
• the pressure switch further comprising a pointer formed from a resin material integrally with the swivel plate, for indicating a threshold value of the pressure of the fluid detected by the detecting means,
• wherein the elasticity adjusting means variably stretches and compresses the elastic member by movement of the swivel plate, and maintains the elastic member at a position at which a predetermined elastic force is obtained, and
• wherein the swivel plate is colored together with the pointer in a high saturation color.