Fluid intensifier for a dry gas seal system

An intensifier for a gas supply system of a mechanical seal comprising;

• a drive cylinder which is operatively connected to a boost cylinder by an intermediate piston rod, said drive cylinder having a pressurized cylinder housing which defines a drive pressure chamber subdivided into variable-volume, first and second cylinder chambers by a reciprocating drive piston;
• said boost cylinder having a pressurized cylinder housing which defines a boost pressure chamber that is subdivided into variable-volume, third and fourth cylinder chambers by a reciprocating boost piston, a piston rod slidably extending between said drive and boost pistons so that said boost piston is driven by said drive piston;
• said first and second chambers being alternately pressurized and depressurized by an air source to drive said drive piston in opposite first and second directions and effect a corresponding driving of said boost cylinder, a diametric area of each of said drive and boost pistons differing wherein the area of the drive piston is larger than the area of said boost piston such that air pressure driving the drive cylinder increases an outlet pressure generated in the boost cylinder and being output from said boost cylinder for supplying a mechanical seal with dry gas as a barrier fluid;
• and
• a valve system to control a flow of a dry gas through said boost cylinder, which comprises a 5/2 way control valve unit having a control valve, said control valve having five ports comprising an inlet port which connects to a source of pressurized air, first and second outlet ports to alternatingly supply pressurized air to said first and second cylinder chambers and first and second exhaust ports to alternatingly exhaust air from said first and second cylinder chambers, said valve system including an automated controller which selectively opens and closes said ports of said control valve and controls operation of said intensifier.