Gate valve seat and seat ring

The invention relates to a gate valve seat and a seat ring. A gate valve (40) has a body (42) having a cavity (45) and a flow passage (44) intersecting the cavity (45). A seat (50) is mounted to the body (42) at the intersection of the flow passage (44) and the cavity (45). A gate (46) is installed...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	GRAY DENNIS, WOLFE CHRISTOPHER E, AJDELSZTAJN LEONARDO
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ACTUATING-FLOATS BLASTING COCKS DEVICES FOR VENTING OR AERATING EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING ENGINEERING ELEMENTS AND UNITS FIXED CONSTRUCTIONS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MECHANICAL ENGINEERING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS TAPS THERMAL INSULATION IN GENERAL VALVES WEAPONS
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Beschreibung
Zusammenfassung:	The invention relates to a gate valve seat and a seat ring. A gate valve (40) has a body (42) having a cavity (45) and a flow passage (44) intersecting the cavity (45). A seat (50) is mounted to the body (42) at the intersection of the flow passage (44) and the cavity (45). A gate (46) is installed at the cavity (45) and has an engaging face (80) that slidingly engages the seat (50) while the gate (46) is being moved between open and closed positions. The end faces (58,72) between a seat pocket and the seat are hard-coated layers (70,74) and smooth-finished to provide sealing when mated. The hard-coated pocket and seat sealing surfaces (58,72) extend the life of the valve (40) by eliminating the need for an elastomeric seal of limited life.