Injector

An injector (I) comprising a body (B) including therein:

• a first outer inlet portion (13) for a fluid to be sent under pressure (F);
• a first outer outlet portion (14) for the fluid sent under pressure;
• a connecting inlet portion (21) communicating with the first outer inlet portion;
• a connecting outlet portion (22) communicating with the first outer connecting outlet portion;
• a second outer inlet portion (31) communicating with the connecting inlet portion;
• a second outer outlet portion (32) communicating with the connecting outlet portion;
• a first chamber (40) including a first intake portion (41) communicating with the first outer inlet portion and a first discharge portion (42) communicating with the first outer outlet portion;
• a second chamber (50) including a second intake portion (51) communicating with the second outer inlet portion and a second discharge portion (52) communicating with the second outer outlet portion;
• a first intake check valve (61) interposed between the first outer inlet portion and the first intake portion for causing the pressured fluid to flow toward the first intake portion;
• a first discharge check valve (66) interposed between the first discharge portion and the first outer outlet portion for causing the pressured fluid to flow toward the first outer outlet portion;
• a second intake check valve (71) interposed between the second outer inlet portion and the second intake portion for causing the pressured fluid to flow toward the second intake portion;
• a second discharge check valve (76) interposed between the second discharge portion and the second outer outlet portion for causing the pressured fluid to flow toward the second outer outlet portion;
• a pressure application mechanism (80) including a first pressure application diaphragm portion (81) with the outer peripheral portion thereof fixed on the inner wall (40a) of the first chamber and a second pressure application diaphragm portion (82) with the outer peripheral portion thereof fixed on the inner wall (50a) of the second chamber, the first pressure application diaphragm portion (81) and the second pressure application diaphragm portion (82) being arranged to be integrally movably by a coupling (83);
• a working fluid influx/outlet portion (90) open to at least one of the first chamber and the second chamber for causing a working fluid (A) for reciprocating the pressure application mechanism to flow into or flow from at least one of the first chamber and the second chamber;
• a first urging diaphragm portion (100) arranged on the outer wall surface (40b) of the inner wall of the first chamber for pressing the first pressure application diaphragm portion toward the second pressure application diaphragm portion when coming into contact with the outer surface of the first pressure application diaphragm portion;
• first urging means for keeping the first urging diaphragm portion urged toward the second pressure application diaphragm portion;
• a second urging diaphragm portion (120) arranged on the outer wall surface (50b) of the inner wall of the second chamber for pressing the second pressure application diaphragm portion toward the first pressure application diaphragm portion when coming into contact with the outer surface of the second pressure application diaphragm portion;
• and
• second urging means for keeping the second urging diaphragm portion urged toward the first pressure application diaphragm portion.