초록 ▼

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 t

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.

대표청구항 ▼

[ We claim:] [1.] A gate for a shearing gate valve comprising:an elongated body having flat sides and an aperture therethrough and a counterbore at a mouth of said aperture;a hard material filling said counterbore and forming an annular cutting edge at said mouth;said hard material bonding with said

[ We claim:] [1.] A gate for a shearing gate valve comprising:an elongated body having flat sides and an aperture therethrough and a counterbore at a mouth of said aperture;a hard material filling said counterbore and forming an annular cutting edge at said mouth;said hard material bonding with said body; andhard facing material on said flat sides covering said bond.