| 摘要 |
<p>The safety valve has a main lid and a servopiston movable in a servopiston chamber. A pilot valve has a lid loaded by a predetermined force in its closing direction and opens in response to a pressure corresponding to such force. Associated with the pilot valve is a piston whose two end faces extend one each into a piston chamber. One piston chamber is directly connected to the chamber to be protected by the safety valve against excess pressure whereas the other chamber is connected to the inflow side of the pilot valve and by way of a restriction to the protected chamber. A duct communicates the chamber of the pilot valve with the servopiston side remote from the main lid that when the pilot lid opens the main lid is opened by the loading of the servopiston.</p> |
