Pressure swing adsorption apparatus
A pressure swing adsorption apparatus for treatment of gases is disclosed. It includes a main inlet for receiving a flow of gas and one or more adsorption columns containing adsorption material. The columns are connected by a channel and the channel has an annular recess therein to receive a valve. The valve includes a support member formed from a pair of truncated cones and having slots extending therethrough. The valve also has a tubular membrane that surrounds the support member and is movable, in response to pneumatic pressure applied to the membrane, between a first position in which the membrane does not block the slots thereby allowing the gases to flow and a second position in which the membrane blocks the slots thereby preventing said gases from flowing through the valve.
1. A pressure swing adsorption apparatus for treatment of gases, the apparatus comprising:
at least one apparatus inlet for receiving a flow of gas;
at least one adsorption column containing at least one adsorption material for adsorbing at least one component of said gas passing therethrough;
at least one channel connecting at least one said apparatus inlet to at least one said adsorption column such that said flow of gas can pass from said inlet to said column, said channel having at least one recess therein and said recess having at least one recess inlet, at least one recess outlet and at least one valve control inlet; and
at least one valve located between said recess inlet and said recess outlet, the valve including
at least one support member having at least one aperture extending therethrough; and
at least one tubular membrane substantially surrounding said support member, said membrane movable, in response to fluid pressure applied to said membrane through said valve control inlet, between a first position in which said membrane does not block said apertures of said support thereby allowing said gases to flow from said recess inlet to said recess outlet and a second position in which said membrane blocks said apertures of said support thereby preventing said gases from flowing from said recess inlet to said recess outlet.
2. An apparatus according to claim 1 , wherein said adsorption material comprises at least one adsorbent for adsorbing water from said gas.
3. An apparatus according to claim 1 , wherein said adsorption material comprises at least one adsorbent for adsorbing oxygen from said gas.
4. An apparatus according to claim 1 wherein said channel comprises a substantially tubular member formed by extrusion.
5. An apparatus according to claim 1 wherein said recess is machined into said channel.
6. An apparatus according to claim 1 wherein said recess is substantially annular.
7. An apparatus according to claim 1 wherein said support member comprises a pair of frustoconical members engaged with each other and said apertures in said support members extending through curved surfaces of said frustoconical members.
8. An apparatus according to claim 1 wherein said apertures are in the form of slots.
9. An apparatus according to claim 1 wherein said membrane has a thickness substantially equal to the depth of said recess relative to said channel.