A method for linkage alarm between a gas alarm and a gas meter is provided. The method comprises: obtaining a detection signal through electrical connection with the alarm; in response to the detection signal meeting a preset alarm condition, determining a target alarm event corresponding to the detection signal; when the target alarm event is the abnormal gas concentration in the target area, closing, by the gas meter, a gas valve of the gas meter; when the target alarm event is the abnormal operation of the alarm or the abnormal connection of the alarm, receiving a reset instruction; determining a reset alarm event corresponding to the at least one reset operation; determining a credibility of the target alarm event; determining whether to send a control closing instruction to the gas meter based on the credibility; and closing the gas valve of the gas meter based on the control closing instruction.

A computer-implemented method and/or system for controlling a material handler comprises: processing, by an electronic control unit (ECU), a plurality of electronic input signals from at least one joystick; determining an adjustment for at least one of a pair of solenoids based on at least the plurality of electronic input signals from the joystick; controlling the pair of solenoids by the ECU and each solenoid acting in opposition to each of a pair of biasing elements of an open-center directional control valve to move the directional control valve to an extension position or a retraction position from a central position; determining a setpoint buildup pressure for a central passageway of the directional control valve; and actuating a constrictive solenoid of a pressure buildup valve to constrict the central passageway based on the setpoint buildup pressure whereby the constrictive passageway increases a pressure in the central passageway of the directional control valve.

A computer-implemented method and/or system for controlling a material handler comprises: processing, by an electronic control unit (ECU), a plurality of electronic input signals from at least one joystick; determining an adjustment for at least one of a pair of solenoids based on at least the plurality of electronic input signals from the joystick; controlling the pair of solenoids by the ECU and each solenoid acting in opposition to each of a pair of biasing elements of an open-center directional control valve to move the directional control valve to an extension position or a retraction position from a central position; determining a setpoint buildup pressure for a central passageway of the directional control valve; and actuating a constrictive solenoid of a pressure buildup valve to constrict the central passageway based on the setpoint buildup pressure whereby the constrictive passageway increases a pressure in the central passageway of the directional control valve.