A supporting member supporting a valve body includes a supporting member body having a semispherical bottom portion that makes contact with the top face of the valve body and a securing recess that is provided in the center and at a predetermined axial location to adjoin a through hole provided in the valve body, and a securing member including an engaging portion that has a form of a shaft having a predetermined diameter made of an elastic material and protrudes from a proximal end and a securing projection that swells out from a predetermined axial location of the shaft portion to fit into a securing recess provided in a through hole in the supporting member body.

Example embodiments relate to a gas-pressure regulator having an inlet, an outlet, a housing, a diaphragm, a control element, a control chamber and a discharge chamber. The inlet and the outlet each open onto the control chamber, wherein the diaphragm partially delimits the control chamber. The diaphragm and the control element are movable relative to each other, wherein a passage between the control chamber and the discharge chamber is open in a relative discharge arrangement of the diaphragm and the control element. An adjustable biasing element impedes a relative movement between the diaphragm and the control element.

A pneumatic pressure controller includes a body, an inflation plunger, a vent and a deflation diaphragm or piston. The body defines an input chamber and an output chamber for connection of a pneumatic pressure source and pneumatic container respectively. The plunger is biased towards a closed condition wherein it inhibits fluid flow from the input chamber to the output chamber and is movable against the bias to allow such fluid flow for inflation of the pneumatic container. The diaphragm or piston is variably biased towards a closed condition wherein it closes the vent. The diaphragm or piston is configured to move away from the vent to an open condition under the influence of fluid pressure in the output chamber when the inflation plunger is in the closed condition and the variable bias is sufficiently reduced, enabling fluid from the pneumatic container to egress to the atmosphere via the vent.