A valve assembly is provided, the valve assembly comprising a body that defines a fluid flow path between an inlet and an outlet with a frangible member between the inlet and the outlet across the fluid flow path so as to block fluid flow The valve assembly also includes a member for rupturing the frangible member, a spring biasing the rupturing member into contact with the frangible member and a member for retaining the rupturing member away from the frangible member. A magnet is spaced apart from the retaining member, and a non-magnetic sleeve is disposed between the magnet and the retaining member. The non-magnetic sleeve blocks a magnetic field provided by the magnet. Also included is a trigger for removing the non-magnetic sleeve, wherein, when the non-magnetic sleeve is removed, in use, the magnetic field attracts the retaining member to release the rupturing member to cause rupture of the frangible member.

A valve assembly is provided, the valve assembly comprising a body that defines a fluid flow path between an inlet and an outlet with a frangible member between the inlet and the outlet across the fluid flow path so as to block fluid flow The valve assembly also includes means for rupturing the frangible member, means for biasing the rupturing means into contact with the frangible member and means for retaining the rupturing means away from the frangible member. A magnet is spaced apart from the retaining means a non-magnetic sleeve is disposed between the magnet and the retaining means. The non-magnetic sleeve block a magnetic field provided by the magnet. Also included are means for removing the non-magnetic sleeve, wherein, when the non-magnetic sleeve is removed, in use, the magnetic field attracts the retaining means to release the rupturing means to cause rupture of the frangible member.