Valve actuation mechanism, valve arrangement and pipe installation for LH2 applications as well as use thereof

A valve actuation mechanism for actuating a rotatable closing element of a valve for at least one of cryogenic applications or hydrogen applications, comprising:

• a housing defining an inner area which is sealed by a sealing membrane from an outer area,
• an input shaft configured to receive a rotational movement wherein the input shaft is arranged in the outer area,
• an output shaft configured to be connected to the closing element, wherein the output shaft is arranged in the inner area, and
• a strain wave gearing connecting the input shaft and the output shaft, wherein the strain wave gearing comprises a wave generator connected to one of the input and output shafts, a rotatable outer gear wheel connected to the other one of the input and output shafts and a stationary flexible ring gear with external teeth which is deformed by the wave generator to engage with internal gear teeth of the outer gear wheel, wherein the flexible ring gear is provided as a portion of the sealing membrane,
• wherein the sealing membrane comprises a pot shaped center area with an annular wall wherein at least a ring portion of the annular wall comprises the external teeth of the flexible ring gear.