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    • 5. 发明授权
    • Shearing gate valve
    • 剪切闸阀
    • US5803431A
    • 1998-09-08
    • US521677
    • 1995-08-31
    • Loc Gia HoangBrian Haynes
    • Loc Gia HoangBrian Haynes
    • E21B29/04E21B29/08E21B34/02F16K3/02
    • E21B34/02E21B29/04E21B29/08
    • The shearing gate valve includes a gate reciprocably mounted between opposing seat rings. The gate has an opening which aligns with bores in the mating seat rings. The opening in the gate and the bores of the seat rings each have a cutting recess. The cutting recess in each mouth of the opening of the gate is formed by a counterbore which is filled with a weld overlay material that bonds with the material of the gate. A layer of hard facing material covers the sides of the gate and also extends over the bond formed between the gate and weld overlay material but does not completely cover the weld overlay material thus forming the cutting recess. The cutting recess has a depth equal to the thickness of the hard facing material. The weld overlay material is hard so as to prevent the formation of an upset which will score or gall the sealing surfaces between the gate and seat rings.
    • 剪切闸阀包括可往复地安装在相对的座环之间的门。 门具有与配合座圈中的孔对齐的开口。 门的开口和座圈的孔各有一个切割凹槽。 门的开口的每个口中的切割凹槽由沉孔形成,该沉孔填充有与浇口的材料结合的焊接覆盖材料。 一层坚硬的材料覆盖了浇口的侧面,并且也延伸到形成在栅极和焊接覆盖材料之间的结合处,但是不完全覆盖焊接覆盖材料,从而形成切割凹槽。 切割凹槽的深度等于硬质材料的厚度。 焊接覆盖材料是硬的,以便防止形成将使门和座圈之间的密封表面划伤或磨损的镦粗。