Two-way pulp stock valve

Claim 1

A PULP STOCK VALVE FOR THE CONTROL OF THE FLOW OF FLUID IN EITHER DIRECTION THROUGH THE VALVE, THE SAID GATE VALVE COMPRISING A HOUSING HAVING A FLUID FLOW PASSAGE THERETHROUGH, A VALVE GATE ALIGNED TRANSVERSELY OF THE SAID PASSAGE AND ADAPTED TO BE MOVED INTO OPENING AND CLOSING POSITIONS RELATIVE TO SAID PASSAGE, THE SAID VALVE GATE HAVING ITS LOWER EDGE TAPERED AND HAVING ITS SIDE EDGES NOTCHES TO PROVIDE CUTTING EDGES, AN ANNULAR RECESS IN THE WALLS OF SAID PASSAGE LOCATED ON ONE SIDE OF THE PLANE OF SAID GATE VALVE, AND ANNULAR FLOATING METAL VALVE SEAT IN SAID ANNULAR RECESS, A STUFFING BOX IN SAID HOUSING, THE SAID STUFFING BOX MAINTAINING THE SAID VALVE GATE FLUID PRESSURE TIGHT IN SAID HOUSING, THE SAID VALVE SEAT BEING MOVABLE INTO THE PLANE OF THE SAID STUFFING BOX AND IS REMOVABLE THERETHROUGH WHEN THE SAID VALVE GATE HAS BEEN REMOVED FROM THE SAID HOUSING, AND MEANS TO MAINTAIN THE SAID VALVE SEAT IN METAL TO METAL SEALING CONTACT WITH THE SAID VALVE GATE WHEN THE SAID VALVE GATE IS IN THE CLOSED POSITION, THE SAID MEANS PROVIDING A PRESSURE SEAL BETWEEN THE SAID VALVE SEAT AND THE SAID HOUSING.