A valve (10) spring three way, two position comprising a housing (12) with a first port (20), a second port (16), a third port work (18) and a camera (14) generally cylindrical valve with a shaft, which chamber (14) valve is defined between a first seat coaxial annular (26) valve associated with said first port (20), and a second annular seat coaxial (28) valve associated with said second port (16), said port work (18) laterally connected to said chamber (14) valve, which valve (10) spring being further comprising a body (36) spring disposed in said chamber (14) valve and intended for performing a reciprocating movement between two positions, such that in a first position, the body (36) spring seals said first seat (26) valve and a communication is provided fluidly between said second port (16) and said port work (18), and in a second position, the body (38) spring seals said second seat (28) valve and a communication is provided for fluid flow between said first port (20 ) and said working port (18); wherein said housing (12) has a first coaxial cylindrical passage (24) adjacent said first seat (26) valve and a second coaxial cylindrical passage (30) adjacent said second seat (28) valve, whose body ( 36) spring has a first cylindrical portion coaxial (46) which fits slidably and sealingly said first conduit (24) pass, and coaxial cylindrical second part (48) which fits slidably and sealingly with said second conduit (30) step, so that said body (36) spring is always supported at least in one of the cylindrical bores (24, 30) pass and communication for passage of fluid between said first port (20) are always prevented and that second port (16).
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