| 摘要 |
<p>PURPOSE:To ensure a predetermined descending speed regardless of a load to a riding cage by providing both a flow-rate measuring valve which measures a flow-rate in the main pipe passage and a throttle valve which operates in correspondence with the flow-rate measuring valve so as to control the pilot flow-rate. CONSTITUTION:A flow-rate measuring valve 22 is installed in the main pipe passage. By using this flow-rate measuring valve 22, a throttle valve which controls a flow-rate control valve 5 is regulated. With this constitution, it is possible to regulate the opening of the throttle valve 24, corresponding only to the flow-rate, without being affected by the pressure of pressured oil. As a result, variation in speed of a hydraulic elevator due to the change in the elevator load can be eliminated.</p> |
