Reversing valve with small torque

Abstract

This invention relates to a small torque changeover valve, which comprises valve, tightening dynamic valve core and static valve core one of which is made of politef materials. The invention uses the characteristics of the stainless steel, tungsten alloy and ceramics, which lowering the pressure on the dynamic valve core to ensure the sealing demands of the dynamic and static valves and to lower the resistance torque of the dynamic and static valve cores when in starting to realize the dynamic valve core of small torque.

Description

Technical field [0001] The invention relates to a low-torque reversing valve, in particular to the application of the valve core material of the reversing valve. Background technique [0002] The existing type of reversing valve includes a moving spool and a fixed spool in close contact. The material of the moving spool and the fixed spool is generally stainless steel, tungsten alloy or ceramics. The positional relationship between the moving spool and the fixed spool is changed by rotating the moving spool. To achieve the purpose of changing the fluid flow path. In order to prevent the fluid from flowing out from the contact surface of the driven spool and the fixed spool, in addition to requiring the contact surface of the movable spool and the fixed spool to be fully bonded, it is also necessary to apply a large pressure on the movable spool to make the dynamic The spool and fixed spool are in closer contact. If the movable spool and fixed spool of this kind of reversin...

AI Technical Summary

Problems solved by technology

If the movable spool and fixed spool of this kind of reversing valve remain static and do not rotate for a long time under the action of pressure, a large starting torque will be required to rotate the movable spool, especially for motors or motors. Electromagnetic mechanism drives this kind of reversing valve. After a long period of static time, due to excessive starting torque, it is easy to cause unreliable starting.