A valve seat having a tubular valve seat wall portion that extends about a frusto-conical valve member that moves longitudinally into the valve seat to close a valve in which the seat and valve member are included.Needle & Gauge Valves Coaxial openings are formed through the valve seat wall portion to provide for passage of fluids through the valve and at least one longitudinally extending groove is formed in the inner surface of the valve seat wall portion, to extend the length thereof, between the openings.Safety valves A second groove can be formed in the inner surface of the wall portion opposite the first groove or, alternatively, a cut can be formed through the wall portion opposite the first groove. The valve seat can be locked against rotation by making the wall portion thereof square or providing the wall portion with an anti-rotation tab at one end of the wall portion or a notch formed through a flange at one end of the wall portion. GLOBE VALVEThe wall portion can be formed in two semi-tubular halves connected by a foldable web and the web can be placed on the curved surfaces of the halves to form an anti-rotation tab when the web is folded to form the wall portion into a tubular seat.

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