Tamper-resistant valve and connection arrangement

An assembly of a gas cylinder fitted with a gas cylinder valve able to be opened by application of a pilot gas pressure, and a yoke, wherein the gas cylinder valve comprises a pilot gas chamber having an inlet connectable to a source of pressurised pilot gas, and a displaceable member able to act in concert with a valve member to open and close a gas passage placing the interior of the cylinder in communication with a cylinder gas port in the gas cylinder valve, wherein the displaceable member is normally biased into a valve closing position, but is able to be displaced by the pilot gas pressure against the bias from the valve closing position to a position in which the gas cylinder valve is open, wherein the yoke is able to connect the pilot gas chamber to a source of pressurised pilot gas and the cylinder gas port of the cylinder gas valve to an external cylinder gas passage, wherein the gas cylinder valve and the yoke core connected by interchangeable structures provided on the gas cylinder valve and the yoke, and wherein the yoke has a pilot gas passage containing a pilot gas valve.

An assembly according to 13, wherein the gas cylinder valve further comprises a poppet valve, actuatable by an actuator provided on the yoke, for controlling cylinder gas flow.