| 摘要 |
<p>The hydraulic control valve consists of a valve body (6) moving in an oil stream through a valve housing (4) that has three entries. There is a pressure pipe (12), a user pipe (13) and a control pipe (14) entry. The pressure pipe entry can be shut with a ball (9) supported by a spring (8) in which case the valve body is in its upper position and the user and control pipe are pressureless. When the valve body is moved downwards with the help of an electromagnet the pressure pipe entry opens and the control pipe entry closes. The valve body is exposed to the pressurised oil and the pressure on the valve ring base (6b) causes it to open the entry to the control pipe again.</p> |
