Abstract: A balanced valve for flows operated by the axial driving of a stem which commands a sealing body liable to axially slip between an opened position far from the valve seat and a closed seal in contact with the valve s eat. The valve basically consists in a valve body having an inlet opening for the flow with a valve seat at the bottom. The valve body also has an opening for the flow outlet oriented in a substantially cross-section way to the flow inlet. Between the inlet and outlet of flow there is a cylindrical cavity with a ring-shaped broadening in the zone communicating with the flow outlet above the valve seat. There is an elastomeric sealing body located inside the cylindrical cavity, which is mainly made up of a relatively solid sealing end, with a slightly greater height than the height of the ring-shaped broadening of the cylindrical activity.

Abstract: A flow valve operated by a flow transfer controller which regulates a small flow of control in order to produce a pressure differential between the sides of a sealing wall of a piston able to axially move between an open position far from the valve seat and a closed position in contact with the valve seat. The valve of the invention basically consists of a rigid valve body with an opening for a flow inlet and flow outlet. The body of the valve has a main cavity between the inlet and outlet of flow with the valve seat. The valve body comprises an elastomeric body located inside the main cavity to regulate the flow of fluid through the valve. The elastomeric body is hollow and open at an upper end and has a first sealing zone an a lower base of the elastomeric body. Control flow inlet and outlet ducts communicate with the hollow upper portion of the elastomeric body to actuate the valve.

Abstract: A valve for controlling fluid flow comprises a body having an inlet and an outlet, the body having an opening at one end; a controlling stem disposed axially of the body with one end portion extending through the body opening, the stem being pivotable about the body opening between a normal position when the valve is closed and a pivoted position when the valve is open; and a first elastic ring disposed within the body in sealing contact with the stem and disposed between with the inlet and the outlet, thereby to prevent fluid flow from the inlet to the outlet. The stem when in the pivoted position being adapted to deform the first elastic ring to create an opening between the stem and the first elastic ring, thereby to permit fluid to flow from the inlet through the opening to the outlet.