Patent ID: 7467641
Filing Date: 2008-12-23
Classification: F16K,Y10T

Abstract:
1. A metering valve for hydrofluoric plants, comprising a flow chamber for the flow of the fluid, housing a plug and having an inlet passage and another outlet passage located according to perpendicular directions; a guide body through which the actuator stem for actuating the plug member runs, with a sealing with regard to the flow chamber; and an actuator head in which the actuator mechanism for actuating said stem is assembled; which flow chamber internally has guides parallel to the actuator stem, between which guides the plug is assembled and guided, and with a ring on the outlet passage for the seating of said plug, wherein the plug is constituted of a body coated with a hydrofluoric acid-resistant iron, copper and nickel based alloy, having a double seat on the ring assembled at the outlet passage, and in the maximum aperture position, it is situated with the lower base in alignment with the upper edge of the inlet passage, said body being guided in its movement between the on and off positions by guides which are coated with the same iron, copper and nickel alloy; and in that the guide body internally has, in a position adjacent to the flow chamber, a tapering where a lower bushing is screwed, between which bushing and an upper gland a packing is assembled which seals the passage of the stem, said bushing and gland being constituted of an iron, copper and nickel based alloy, and the guide body being coated with the same alloy in the section occupied by these components.