Abstract: A valve for controlling a fluid flow comprises: (a) a valve body having an internal cavity; (b) a valve stem receivable within the internal cavity; the valve stem having a control portion configured and a tail portion; the control portion having a first diameter thereof; (c) a deformable valve seat carried by the control portion in a coaxial conformal manner; and (d) a ring mountable within the internal cavity. The control portion has a circumferentially arranged area adjacent to the tail portion. The circumferentially arranged area is of a second diameter smaller than the first diameter. The ring is mountable between a nut and the valve seat such that the nut when secured to the valve body presses onto the valve seat such that the valve seat is deformed within a space between the circumferentially arranged area defined by the second diameter and fills the space in a sealed manner.

Abstract: A valve for controlling a fluid flow comprises: (a) a valve body having an internal cavity; (b) a valve stem receivable within the internal cavity; the valve stem having a control portion configured and a tail portion; the control portion having a first diameter thereof; (c) a deformable valve seat carried by the control portion in a coaxial conformal manner; and (d) a ring mountable within the internal cavity. The control portion has a circumferentially arranged area adjacent to the tail portion. The circumferentially arranged area is of a second diameter smaller than the first diameter. The ring is mountable between a nut and the valve seat such that the nut when secured to the valve body presses onto the valve seat such that the valve seat is deformed within a space between the circumferentially arranged area defined by the second diameter and fills the space in a sealed manner.

Abstract: A valve for controlling a fluid flow including (a) a valve body; (b) a valve stem securable within the valve body; the valve stem having a control portion configured for blocking the fluid flow and a tail portion configured to transfer a rotating torque; and (c) a deformable valve seat carried thereon in a coaxial and rotating manner; the valve stem and valve seat having inner and outer surfaces, respectively, conformal to each other. The outer surface of the valve stem has a circumferentially-arranged stepped area; the deformable valve seat when secured within the valve is deformed such that a space between the circumferentially-arranged stepped area of the outer surface and the inner surface of the valve seat is filled by the valve seat.