Low-torque valve

A valve for controlling a fluid flow, comprising:

• a. a valve body having an internal cavity;
• b. a valve stem receivable within said internal cavity;
• said valve stem having a control portion configured for blocking said fluid flow and a tail portion configured to transfer a rotational torque;
• said control portion having a first diameter thereof;
• said control and tail portions having control-portion and tail-portion diameters;
• c. a deformable valve seat carried by said control portion in a coaxial conformal manner;
• d. a ring mountable within said internal cavity;
• and
• e. a nut configured for securing said ring within said internal cavity;
• wherein said valve stem comprises a middle portion located between said control and tail portions, said middle portion being generally cylindrically shaped;
• said middle portion has a middle-portion diameter smaller than said control-portion diameter but greater than said tail-portion diameter;
• wherein said ring is mountable between said nut and said deformable valve seat such that said nut when secured to said valve body presses onto said deformable valve seat such that said deformable valve seat is deformed to fill a space in a sealed manner, said space defined between said middle portion and said valve body.