| 摘要 |
A cut-off valve is provided for use on a pressurized line wherein pressure is applied to the line at intervals to dispense a fluid from the line. The valve of the present invention is in the nature of a check valve with a piston arrangement whereby as pressure is released from the line, the valve causes a negative pressure on the outlet, sucking back the last few drops, preventing dripping. The valve is particularly applicable to dispensing a viscous fluid such as glue.
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