Patent ID: 8720850
Filing Date: 2014-05-13
Classification: F16K

Abstract:
1. A suck back system, comprising: an integral-type suck back valve, the integral-type suck back valve comprising: a protective on/off valve provided at an adjacent upstream side in the fluid channel relative to the on/off valve of the integral-type suck back valve, the protective on/off valve configured to perform a fully closing operation to fully close the fluid channel at the adjacent upstream side in the fluid channel relative to the on/off valve by a second pneumatic actuator; and an opening and closing control unit that controls the protective on/off valve to complete the fully closing operation of the protective on/off valve earlier than full closing of the on/off valve of the integral-type suck back valve when the on/off valve of the integral-type suck back valve is operated to close the fluid channel.