Bidirectional metallic seal butterfly valve

Abstract

The invention relates to a bidirectional metallic seal butterfly valve, which comprises a valve body 6; a butterfly plate 7 is arranged in the valve body 6 through a valve rod 9; the bidirectional metallic seal butterfly valve is characterized in that the butterfly plate 7 is provided with wedged dovetail grooves up and down; an upper wedge block 11 and a lower wedge block 5 are arranged in the upper wedged dovetail groove and the lower dovetail groove of the butterfly plate 7 respectively; the valve rod 9 passes through inner holes of the upper wedge block 11 and the lower wedge block 5; an end cover 1 is arranged at the lower end of the valve body 6; a valve cover 15 is arranged at the upper end of the valve body 6; a stuffing box is arranged in the valve cover 15; a stuffing 14 is arranged in the stuffing box of the valve cover 15 through a stuffing gland bush 16; a guide block 17 is fixed on the valve cover 15 and is inserted into a guide groove of the valve rod 9; a valve rod nut 18 is arranged on the upper part of the valve cover 15 and is screwed on the valve rod 9; a bearing 19 is arranged on a convex shoulder of the valve rod nut 18; a bearing gland bush 20 is connected with the valve cover 15 by screw threads; and a hand wheel 22 is arranged on the valve rod nut 18. The bidirectional metallic seal butterfly valve has good sealing performance and reliability, not only ensures that the butterfly valve can be sealed in a positive state, but also ensures the seal in a reverse state, and has simple design and processing.

Description

technical field [0001] The invention relates to the technical field of metal sealing butterfly valves used in petroleum, chemical industry, electric power, water conservancy and other industries, in particular to a bidirectional metal sealing butterfly valve. Background technique [0002] In the prior art, the main structure of the metal hard-sealed butterfly valve is a double eccentric and triple eccentric butterfly valve. The sealing between the butterfly plate and the valve seat of the double eccentric and triple eccentric butterfly valve is achieved by pressing the butterfly plate to the valve seat by the torque of the transmission device. Sealing; when the medium flows forward, the medium pressure increases the sealing specific pressure and improves the sealing performance; when the medium flows in the reverse direction, the medium pressure reduces the sealing specific pressure between the butterfly plate and the valve seat, and leakage may occur. The metal hard seal bu...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the main structure of the metal hard-sealed butterfly valve is a double eccentric and triple eccentric butterfly valve. The sealing between the butterfly plate and the valve seat of the double eccentric and triple eccentric butterfly valve is achieved by pressing the butterfly plate to the valve seat by the torque of the transmission device. Sealing; when the medium flows forward, the medium pressure increases the sealing specific pressure and improves the sealing performance; when the medium flows in the reverse direction, the medium pressure reduces the sealing specific pressure between the butterfly plate and the valve seat, and leakage may occur. The eccentric structure metal hard seal butterfly valve cannot fully guarantee the sealing of the reverse medium flow

Images