Patent ID: 6755354
Filing Date: 2004-06-29
Classification: B05C,F16K

Abstract:
A suck back valve comprising:a main body provided with fluid passage for communicating with a first port formed at one end and a second port formed at the other end; an ON/OFF valve which opens/closes said fluid passage as a valve plug is displaced; a flexible member provided between said first port and said second port of said fluid passage, a flow chamber being formed in said flexible member for connecting said fluid passage having said first port with said fluid passage having said second port; a fixing member for fixing a part of an outer circumferential surface of said flexible member to said main body; a stretching member for increasing a volume of said flow chamber by expanding and deforming said outer circumferential surface of said flexible member; and a displaceable member which is connected to said stretching member for displacing said stretching member, wherein a pressure fluid in said fluid passage is sucked under a negative pressure of said flexible member.