Abstract: A high-pressure, high-temperature gate valve which uses a flat faced gate seating on a flat and preferably interchangeable seat, the gate having a wedge-shape on the upstream side which assists in forcing the seating surfaces together which is highly desirable in high-pressure conditions. The inlet and outlet ports are completely covered in the closed position which enables the valve to withstand extreme pressures. The gate valve further includes a valve stem extending through said chamber and said body having a threaded lower end cooperating with a threaded recess in said gate, said stem being axially rotatable in a bearing means in said body to raise and lower said gate between said open and closed positions, said bearing means including a stuffing box, a lower seat and an upper seat through which said stem extends, said stem including an integral collar located between said seats. The upper seat is provided by the stuffing box.