Three-way poppet valve for work exchanger

A three-way two-position poppet valve comprising a housing with a first port, a second port, a third working port and a generally cylindrical valve chamber with an axis, said valve chamber being defined between a first coaxial annular valve seat associated with said first port, and a second coaxial annular valve seat associated with said second port, said working port being connected laterally to said valve chamber, said poppet valve further comprising a poppet body disposed in said valve chamber and adapted for reciprocation between two positions so that in a first position the poppet body seals said first valve seat and fluid communication is provided between said second port and said working port, and in a second position the poppet body seals said second valve seat and fluid communication is provided between said first port and said working port;

• wherein
• said housing has a first coaxial cylindrical passage adjacent said first valve seat and a second coaxial cylindrical passage adjacent said second valve seat, said poppet body has a first coaxial cylinder part slidingly and sealingly fitting said first passage, and a second coaxial cylinder part slidingly and sealingly fitting said second passage, so that said poppet body is always supported in at least one of the cylindrical passages and fluid communication between said first and said second ports is always prevented.