| 摘要 |
PCT No. PCT/JP81/00131 Sec. 371 Date Dec. 10, 1981 Sec. 102(e) Date Dec. 10, 1981 PCT Filed Jun. 5, 1981 PCT Pub. No. WO82/04300 PCT Pub. Date Dec. 9, 1982.A bonnetless outside-screw type gate valve made of carbon steel, 31/2 nickel steel or other stainless steel material is provided. A yoke 18 is directly screw-joined to the body 1 in which a stuffing box 7 is provided, and a flanged cylindrical buck seatring 16 is screwedly fixed to the lower portion of said stuffing box 7. Seat rings 15 are pressedly attached against a raised fixing surface portion 12 in the fluid conduit hole 11 with the cylindrical end portion of each said seat ring being bent into the stepped edge of said fixing surface portion 12 to thereby fix said seat rings in position.
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