A booster actuator 10 may be positioned between the solenoid 12 and a valve 14, and increases the energy output from the solenoid to activate the valve. In an embodiment, the present invention provides a de-registration method, comprising: initiating, by an HNB GW, release of pre-registration resources corresponding to user equipment after the HNB GW receives indication information indicating that the UE moves to another cell from a source HNB. The first plate has a plurality of first holes located adjacent to the check valve. Accordingly, electric tools typically requiring surface intervention by an operator via an electric cable may be operated on slickline.