Title:
ELECTRICALLY OPERATED VALVE ACTUATOR WITH ELECTRO-MECHANICAL END STOP DETECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/021093
Kind Code:
A1
Abstract:
An electrically operated valve actuator effective for shifting a valve (10) between open and closed positions is disclosed, the valve actuator comprising a movable member in the form of a valve stem (21) connected to a valve body (14), the movable member being driven by an electric motor (22) in linear motion between valve closing and valve opening positions, wherein electrical power to the motor is supplied via a current (25) control including a supplied current detection device. The movable member is designed for an idling length of travel (L) in the opening and closing directions during which the valve (10) is either fully open or fully closed, and the movable member is associated with buffer means (30) that during the idling length of travel gradually increases the torque and power required to move the movable member further in the open and closed positions of the valve (10), respectively.
Inventors:
BORCHGREVINK CHRISTIAN (NO)
FLIDH JON (NO)
FLIDH JON (NO)
Application Number:
PCT/IB2010/002041
Publication Date:
February 24, 2011
Filing Date:
August 18, 2010
Export Citation:
Assignee:
VETCO GRAY SCANDINAVIA AS (NO)
BORCHGREVINK CHRISTIAN (NO)
FLIDH JON (NO)
BORCHGREVINK CHRISTIAN (NO)
FLIDH JON (NO)
International Classes:
F16K31/04
Foreign References:
| EP0287299A2 | 1988-10-19 | |||
| US4770390A | 1988-09-13 | |||
| US5345835A | 1994-09-13 |
Other References:
See also references of EP 2467630A4
Attorney, Agent or Firm:
VETCO GRAY SCANDINAVIA AS (Forskargränd 8 B194, Vasteras, SE)
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