The present application provides an on-off valve and a liquid supply path system. The on-off valve includes: a valve housing defining a receiving cavity, the valve housing having a liquid inlet passage and a liquid outlet passage, wherein both the liquid inlet passage and the liquid outlet passage communicate with the receiving cavity; a sealing member provided in the receiving cavity, wherein a buffer chamber is formed between the sealing member and the liquid outlet passage; a buffer member provided between the liquid inlet passage and the sealing member; wherein in an initial state, the buffer member abuts against the sealing member to block communication between the liquid inlet passage and the liquid outlet passage; under action of negative pressure in the buffer chamber, a gap is formed between the sealing member and the buffer member, and the liquid inlet passage and the liquid outlet passage communicate through the gap.

The present application provides an on-off valve and a liquid supply path system. The on-off valve includes: a valve housing defining a receiving cavity, the valve housing having a liquid inlet passage and a liquid outlet passage, wherein both the liquid inlet passage and the liquid outlet passage communicate with the receiving cavity; a sealing member provided in the receiving cavity, wherein a buffer chamber is formed between the sealing member and the liquid outlet passage; a buffer member provided between the liquid inlet passage and the sealing member; wherein in an initial state, the buffer member abuts against the sealing member to block communication between the liquid inlet passage and the liquid outlet passage; under action of negative pressure in the buffer chamber, a gap is formed between the sealing member and the buffer member, and the liquid inlet passage and the liquid outlet passage communicate through the gap.

A timing adjustment valve includes a pilot body provided with a first port, a second port, and a drive port, a check valve mechanism which allows a fluid to flow from the first port to the second port and prevents the fluid from flowing from the second port to the first port, and a timing adjustment mechanism which opens and closes an internal flow passage by supplying and discharging a drive fluid to and from the drive port. The timing adjustment mechanism is configured to be arranged in parallel with the check valve mechanism in the internal flow passage and allow the fluid to flow when the pressure of the drive fluid supplied and discharged to and from the timing adjustment mechanism through the drive port is equal to or less than a predetermined value.

A timing adjustment valve includes a pilot body provided with a first port, a second port, and a drive port, a check valve mechanism which allows a fluid to flow from the first port to the second port and prevents the fluid from flowing from the second port to the first port, and a timing adjustment mechanism which opens and closes an internal flow passage by supplying and discharging a drive fluid to and from the drive port. The timing adjustment mechanism is configured to be arranged in parallel with the check valve mechanism in the internal flow passage and allow the fluid to flow when the pressure of the drive fluid supplied and discharged to and from the timing adjustment mechanism through the drive port is equal to or less than a predetermined value.

A suck-back valve includes a valve main body formed with a suck-back chamber, and a suck-back mechanism unit. The suck-back mechanism unit includes a suck-back piston accommodated in a suck-back cylinder chamber and being slidable between two dead center positions, and a biasing member biasing the suck-back piston in a direction to increase the volume of the suck-back chamber. The suck-back cylinder chamber is divided by the suck-back piston into a first fluid chamber and a second fluid chamber. The biasing member is arranged in the first fluid chamber, and a standby position at which the suck-back piston is positioned when the pressure of a drive fluid in the second fluid chamber becomes the maximum is set to be away from the dead center position on the side closer to the suck-back chamber.

A suck-back valve includes a valve main body formed with a suck-back chamber, and a suck-back mechanism unit. The suck-back mechanism unit includes a suck-back piston accommodated in a suck-back cylinder chamber and being slidable between two dead center positions, and a biasing member biasing the suck-back piston in a direction to increase the volume of the suck-back chamber. The suck-back cylinder chamber is divided by the suck-back piston into a first fluid chamber and a second fluid chamber. The biasing member is arranged in the first fluid chamber, and a standby position at which the suck-back piston is positioned when the pressure of a drive fluid in the second fluid chamber becomes the maximum is set to be away from the dead center position on the side closer to the suck-back chamber.

A method of preventing drippage in a liquid dispensing system includes generating at least a first proxy signal representing at least a first indirect measure of a position of a first automatic control valve (ACV), wherein the first ACV has positions ranging from fully closed to fully open. The method further includes recognizing, based on at least the first proxy signal, whether a failure state exists in which the first ACV has failed to close. The method further includes causing a second ACV to close when the failure state exists, wherein the second ACV is fluidically connected to the first ACV, and the second ACV has positions ranging from fully closed to fully open.

A method of preventing drippage in a liquid dispensing system includes generating at least a first proxy signal representing at least a first indirect measure of a position of a first automatic control valve (ACV), wherein the first ACV has positions ranging from fully closed to fully open. The method further includes recognizing, based on at least the first proxy signal, whether a failure state exists in which the first ACV has failed to close. The method further includes causing a second ACV to close when the failure state exists, wherein the second ACV is fluidically connected to the first ACV, and the second ACV has positions ranging from fully closed to fully open.