Abstract: A method for determining the end-of-travel positions of a diaphragm in a diaphragm valve having an actuator: initiating displacement of the diaphragm into a first end-of-travel position; ascertaining the first end-of-travel position of the diaphragm, wherein said first end-of-travel position is ascertained by monitoring an actuating current value, wherein the first end-of-travel position is reached when a predefined current value is reached; saving the first end-of-travel position; moving autonomously, preferably in the opposite direction, towards a second end-of-travel position of the diaphragm; ascertaining the second end-of-travel position of the diaphragm, wherein said second end-of-travel position is ascertained by means of a predefined travel length (a) of the diaphragm from the first end-of-travel position; saving the second end-of-travel position.

Abstract: Hand lever, preferably produced from plastics material, for operating a valve, preferably a butterfly valve or a ball valve, including a lever and a locking plate, wherein the lever comprises a locking element and a lever upper part, wherein a fastening element for fastening on a valve and for connection to the locking plate is arranged on the lever upper part and the locking plate comprises a receiving opening for receiving the fastening element, characterized in that the receiving opening is realized in an oval manner and the fastening element comprises a round cross-sectional area or the fastening element comprises an oval cross-sectional area and the receiving opening is realized in a round manner, wherein the oval and round contour of the receiving opening preferably comprises at least one recess or slot.

Abstract: A method for determining the end-of-travel positions of a diaphragm in a diaphragm valve having an actuator: initiating displacement of the diaphragm into a first end-of-travel position; ascertaining the first end-of-travel position of the diaphragm, wherein said first end-of-travel position is ascertained by monitoring an actuating current value, wherein the first end-of-travel position is reached when a predefined current value is reached; saving the first end-of-travel position; moving autonomously, preferably in the opposite direction, towards a second end-of-travel position of the diaphragm; ascertaining the second end-of-travel position of the diaphragm, wherein said second end-of-travel position is ascertained by means of a predefined travel length (a) of the diaphragm from the first end-of-travel position; saving the second end-of-travel position.

Abstract: Hand lever, preferably produced from plastics material, for operating a valve, preferably a butterfly valve or a ball valve, including a lever and a locking plate, wherein the lever comprises a locking element and a lever upper part, wherein a fastening element for fastening on a valve and for connection to the locking plate is arranged on the lever upper part and the locking plate comprises a receiving opening for receiving the fastening element, characterized in that the receiving opening is realized in an oval manner and the fastening element comprises a round cross-sectional area or the fastening element comprises an oval cross-sectional area and the receiving opening is realized in a round manner, wherein the oval and round contour of the receiving opening preferably comprises at least one recess or slot.