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A gas cylinder valve 2 is able to be opened by application of a pilot gas pressure. In certain embodiments the gas cylinder valve 2 is usable with a yoke 8 for engaging with a valve assembly of a gas cylinder 1, the yoke comprising a pilot gas passage 28 able to connect a pilot gas chamber 37 in the

A gas cylinder valve 2 is able to be opened by application of a pilot gas pressure. In certain embodiments the gas cylinder valve 2 is usable with a yoke 8 for engaging with a valve assembly of a gas cylinder 1, the yoke comprising a pilot gas passage 28 able to connect a pilot gas chamber 37 in the cylinder valve assembly to a source of pressurized pilot gas and the cylinder gas port of the gas cylinder valve to an external cylinder gas passage. The valve and yoke enable the tamper-resistance of a gas cylinder to be improved.

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1. 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

1. 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 an interior of the cylinder in communications 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 the source of pressurised pilot gas and the cylinder gas port of the cyIinder gas valve to an external cylinder gas passage;wherein the gas cylinder valve and the yoke are connected by interengageable structures provided on the valve and the yoke, the interengageable structures comprising external locating studs on the gas cylinder valve and cooperating regions in the yoke;wherein the yoke comprises a handle and a connector portion for connection to the cylinder valve, the handle being movable relative to the connector portion from a first position in which the gas cylinder is not locked to the yoke to a second position in which the gas cylinder is locked to the yoke, the connector portion comprising a pair of arms, both of which have cam surfaces which when the yoke is in position engage the external locating studs, the arms being so connected to the handle that operation of the handle causes the cam surfaces to move over the locating studs from a first position in which the yoke engages the gas cylinder valve but is not locked thereto to a second position in which the yoke is locked to the gas cylinder valve; andwherein the cam surfaces have, in use, a snail cam action. 2. 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 an 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 the 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 are connected by interchangeable structures provided on the gas cylinder valve and the yoke;wherein the yoke has a pilot gas passage containing a pilot gas valve, the pilot gas valve having a valve member normally biased into a valve closing position, but able to be displaced from the valve closing position by the action of locking the yoke to the gas cylinder valve. 3. An assembly according to claim 2, wherein the valve member of the pilot gas valve is a poppet. 4. An assembly according to claim 2, wherein the cylinder gas port has a nozzle through which extends from a face thereof to the pilot gas chamber a pilot gas conduit, the nozzle being adapted to displace the valve member of the pilot gas valve so as to open the pilot gas passage thereby permitting flow of pilot gas from the pilot gas passage to the pilot gas chamber via the pilot gas conduit. 5. 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 an 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 the 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 are connected by interengageable structures provided on the valve and the yoke, the interengageable structures comprising external locating studs on the gas cylinder valve and cooperating regions in the yoke;wherein the yoke comprises a handle and a connector portion for connection to the cylinder valve, the handle being movable relative to the connector portion from a first position in which the gas cylinder is not locked to the yoke to a second position in which the gas cylinder is locked to the yoke, the connector portion comprising a pair of arms, both of which have cam surfaces which when the yoke is in position engage the external locating studs, the arms being so connected to the handle that operation of the handle causes the cam surfaces to move over the locating studs from a first position in which the yoke engages the gas cylinder valve but is not locked thereto to a second position in which the yoke is locked to the gas cylinder valve; andwherein the pilot gas passage downstream of the gas cylinder valve communicates with a locking chamber in the yoke, gas pressure in the locking chamber urging a retractable stop into a position in which the retractable stop is received in a complementary aperture in one of the said arms so as to lock the yoke in said second position to the gas cylinder valve. 6. An assembly according to claim 5, wherein one or both of the said arms has a detent which when the cam surfaces are in said second position engages a spring loaded ball carried in the yoke. 7. 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 an 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 the 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 are connected by interchangeable structures provided on the gas cylinder valve and the yoke;wherein the yoke has a pilot gas passage containing a pilot gas valve; andwherein the gas cylinder valve has a pair of guide flanges to facilitate location of the yoke.