| 摘要 |
<p>PURPOSE:To lower the pressure withstanding performance of conduit while to reduce usage of compressed air by controlling the pressure of air pressure source for air pressure cylinder for driving a pump for pressure feeding the liquid with correspondence to the pressure in delivery line. CONSTITUTION:A pump 1b for delivering liquid such as sealant, adhesive,paint, etc. is provided. Said pump 1b is driven through a pneumatic cylinder 1a. Compressed air is fed through a changeover valve 1d into said cylinder 1a. While an air pressure source 8 is coupled with high and low pressure air supply paths 9, 10. Reducing valves 9a, 10a and control valves 9b, 10b for regulating respective pressure are arranged in respective path 9, 10. Respective supply path 9. 10 is coupled through said control valves 9b, 10b to the changeover valve 1d. Said control valves 9b, 10b are controlled by the pressure in the delivery line 2.</p> |
