Apparatus for continuous detection of load in an electric valve actuator
US5836567A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1996 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Apr 30, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K37/0041
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In an electric valve actuator, an apparatus is provided for preventing overload of a motor by continuously detecting the torque of the motor as a prime mover. The apparatus includes a valve stem which is moved up and down by the motor through a reduction transmission mechanism. The reduction mechanism includes a screw feed system such as a worm and a worm wheel. A pressure reception plate is disposed to receive the thrust from this feed system, and a strain gauge is fitted to the pressure reception plate. The torque of the motor can be detected continuously according to the change in resistance of the strain gauge caused by deformation of the pressure reception plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.