私人影院做爱视频,岛国女优av高清在线,我和亲妺婷婷在浴室作爱经过,女人和拘做受全过程免费,成人无码区免费AⅤ片WWW软件,亚洲AV无码国产成人久久强

current location: Home   >> News >> Company news

Valve control can be electric actuator, why use hydraulic control?

Hydraulic valves are generally used in large diameter valves, if the electric valve is not easy to drive, need a large torque. For example, the valve of cooling water tower flow control in the power plant, the diameter of the general choice of large power plants is about 2 meters, 2 meters, how much force is needed, so the electric valve can not drive.

Another is the power plant in front of the main steam door quickly shut off the valve, listen to the name also know, fast, or a principle, hydraulic pressure has strength. So fast. Another reason is that the electric valve is driven by a screw, want to switch the screw slowly turn. And the hydraulic valve transmission rod is directly lifting, must be fast.


息烽县| 金门县| 谷城县| 遂溪县| 绥德县| 都匀市| 宁南县| 浦北县| 政和县| 大石桥市| 紫阳县| 海口市| 汾阳市| 云龙县| 青州市| 屏山县| 理塘县| 吴堡县|