Recycling exhaust fumes valve

An accessory mounted on an internal combustion engine for recycling exhaust fumes thereof, comprising in combination, a valve unit mounted along a pipe connected between an exhaust pipe of the engine and an intake manifold of the engine, said valve comprising a cylindrical casing having a first inlet end in fluid communication with the exhaust pipe, and a second outlet end having a pipe extending in said casing toward said first end in fluid communication with the intake manifold;

• said cylindrical casing having a conical valve seat formed therein between said second outlet end and said first inlet end;
• a spherical ball positioned within said cylindrical casing between said first inlet end and said valve seat for movement therebetween, said valve seat being formed by said cylindrical casing and including a constricted portion extending from near said first inlet end toward said second outlet end and terminating in an annular flange portion near said second outlet end;
• a compression spring mounted about said pipe having a first end adjacent said second outlet end of said casing and a second end extending beyond said annular flange, said second end of said spring abutting against said spherical ball to urge said ball toward said first inlet end, said spherical ball being closed in said conical seat when the gas pressure from said first inlet end is greater than the force exerted by said compression spring;
• and a means for varying the compression force of said spring, said means comprising a threaded bolt extending through said second outlet end of said cylindrical casing, said threaded bolt having a first end outside of said casing and a second end in said casing in close proximity to said spring, said second end of said threaded bolt having a groove formed therein, said means further comprising a ring through which a plurality of turns of said spring pass, said ring having an eyelet formed remote from said plurality of turns positioned in said groove of second end of said threaded bolt, whereby the force of said compression spring on said ball may be varied by turning said threaded bolt and therefore varying the location of said plurality of turns.