초록 ▼

A through-conduit, double-wedging parallel seat gate valve. The valve has a monolithic body forming a spherical segment with a cylindrical flow passage and flange end connections. The body has a transverse chamber mounting a rectangular gate moved across the passage between opened and closed positio

A through-conduit, double-wedging parallel seat gate valve. The valve has a monolithic body forming a spherical segment with a cylindrical flow passage and flange end connections. The body has a transverse chamber mounting a rectangular gate moved across the passage between opened and closed positions. The chamber has an obround cross section with parallel sides facing the sides of the gate and rounded ends facing the edges of the gate. Integral parallel guide surfaces on the body separate the rounded ends from the parallel sides, and these guide surfaces engage the edges of the gate. Replaceable seats about the flow passage seal to the sides of the gate. Upper and lower closure members are releasably secured on annular sealing surfaces on the body and enclose the gate within the chamber. The flanges and body can have the same radii as the bar stock from which the body is machined. The guide surfaces are tangents at the intersection of semicylindrical grooves in the parallel sides with the rounded ends. These grooves facilitate removal of the seats.

대표청구항 ▼

In a through-conduit gate valve having a body containing a cylindrical flow passage extending therethrough between end parts for connecting said valve into a piping system; a transverse chamber through said body extending across said flow passage, and said chamber housing a gate moved transversely a

In a through-conduit gate valve having a body containing a cylindrical flow passage extending therethrough between end parts for connecting said valve into a piping system; a transverse chamber through said body extending across said flow passage, and said chamber housing a gate moved transversely across said flow passage between open and closed positions, first and second closure members releaseably secured on annular seal surfaces to said body for enclosing said chamber; an elongated gate having parallel sides and edges with a substantially rectangular cross section, and said gate having in longitudinal spaced relationship an imperforate portion and a perforate portion with an opening conforming to said flow passage; said body carrying removable annular seats releaseably mounted in annular recesses about said flow passage and said seats engaging fluid tightly the parallel sides of said gate in its open and closed positions: gate guide means in said body for controlling transverse and lateral movement of said gate between open and closed positions; one of said closure members receiving said imperforate portion of said gate when in its open position; the improvement comprising: (a) said body having unitary gate guide means wherein said transverse chamber has a symmetrical oblong cross section defined by parallel sides facing the sides of said gate and rounded ends adjacent to the edges of said gate; (b) transverse gooves extending inwardly into said body from said transverse chamber and between said parallel sides and said rounded ends; and (c) said transverse grooves within said rounded ends providing parallel strip guide surfaces for engaging the edges of said gate during its movement between opened and closed positions.