CN2280175Y - High performance butterfly valve - Google Patents

Abstract

The utility model relates to a high performance butterfly valve, which is composed of a valve body, a double eccentric sphere butterfly plate, a rotating shat and a sealing seat. A metal type or a polytetrafluoroethylene type sealing ring, a flexible graphite spacing sleeve and a press ring are arranged between a butterfly plate and the sealing seat. A a groove and a b groove are respectively arranged on the outer diameter and the inner diameter of the metal type sealing ring. The utility model adopts the metal type sealing ring to make a product run in a long time under the condition of t=-50-+500DEG. C, PN<=4.0MPa. The utility model adopts the polytetrafluoroethylene type sealing ring to make the product run in a long time under the condition of t=-50-+200DEG. C, PN<=4MPa.

Description

The high-performance butterfly valve

The utility model relates to a kind of valve, particularly a kind of high-performance butterfly valve of non-resilient, non-rigid seal ring of two eccentric spherical sealing surfaces.

Known butterfly valve comprises line style butterfly valve or eccentric flange butterfly valve in the wafer type, they all exist working pressure low, be nominal pressure PN=1MPa, PN=1.6Mpa, below serviceability temperature t=100 ℃, when under High Temperature High Pressure, the end face of butterfly valve promptly produces seepage and can not use, and has limited the purposes of butterfly valve greatly.

The purpose of this utility model is the shortcoming that overcomes existing butterfly valve, improves its heatproof and withstand voltage properties, makes the working pressure of butterfly valve can reach PN=4Mpa, and serviceability temperature reaches 500 ℃ and do not produce seepage.

The utility model is realized in such a way: the high-performance butterfly valve of being made up of valve body, butterfly plate, rotating shaft and sealing seat, its butterfly plate adopts two eccentric spherical butterfly plates, two kinds on the seal ring employing metal mold of valve seat or polytetrafluoroethylplastic plastic type, be respectively equipped with an elastic telescopic groove on the internal diameter of metal o-ring and the external diameter, corresponding work laterally or longitudinally shrinks or expansion to guarantee butterfly valve seal ring in the using process that is in temperature variation to be out of shape with the linear expansion of butterfly valve, forever contacts with the tight of spherical butterfly plate with solution high temperature, high pressure lower sealing surface.Moreover, because the end face of valve seat insert also has an Expanded graphite circle (cover), Expanded graphite belongs to flexible material, and it is high temperature resistant, high pressure, therefore, being used of valve seat insert and Expanded graphite circle, can guarantee that the spherical butterfly plate butterfly valve can be at high temperature, can not produce seepage under the high pressure, make this butterfly valve can be for a long time at PN≤4Mpa, ℃ (teflin ring be at PN≤4Mpa in t=-50～+ 500, t=-50～+ 200 ℃) use down, make butterfly valve reach high performance requirement, when this butterfly valve is installed on pipeline, pipeline and valve body are clamped by the bolt at valve body two ends, and can not directly compress seal ring, can guarantee that like this valve seals has enough elasticity.

Below in conjunction with accompanying drawing enforcement of the present utility model is described in further detail:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is a spherical butterfly plate schematic representation of the present utility model;

Fig. 3 is the schematic representation of metal mold valve seat insert of the present utility model;

Fig. 4 is a sealed structural representation of the present utility model.

As shown in Figure 1, by valve body 1, butterfly plate 5, rotating shaft 4 and 7 and the high-performance butterfly valve formed of sealing seat 11, it is characterized in that butterfly plate 5 is two eccentric sphericals, sealing surface is sphere (Fig. 2), cover 17 and pressure ring 9 (Fig. 4) between a metal mold seal ring 8 (or teflin ring) and Expanded graphite are arranged between sealing seat 11 and the butterfly plate 5, be respectively equipped with a groove a and groove b (Fig. 3) on the external diameter of metal mold valve seat insert 8 and the internal diameter.The axis hole that up/down perforation is arranged on the valve body 1 of the present utility model, there is a bearing 10 supporting in the upper shaft hole and goes up rotating shaft 7, a graphite packing 14 and Packing seat 13 are housed on the diameter of axle of rotating shaft, and it is compressed with gland 15, by support 16 with its supporting, last rotating shaft and butterfly plate 5 are fixed by the fixing pin 18 of band tapering, the axis of fixing pin is parallel with the base of valve plate, and be positioned at the neat seam place of rotating shaft and valve plate axis hole, like this, when valve plate was opened and closed, fixing pin only bore axial pressure, to reduce the diameter of fixing pin.In the through hole of valve body lower portion, by bearing 3 supporting lower rotary shafts 4, lower rotary shaft is by the bottom cover support, and uses screw in compression, and a pad 2 is arranged between valve body and the sealing seat.The center countershaft center line that two eccentric butterfly plate of the present utility model is meant the butterfly plate sealing surface is axially and a throw of eccentric H and L arranged respectively radially, this two eccentric butterfly plate can guarantee equidistant even contact, and raising seal pressure, butterfly plate is steadily entered and leave, in the time will sealing, can revolve tighter and tighter, guarantee sealing, and moment can reduce; In the time will opening butterfly plate, also can speed away, with passing through of dependable flow.The sphere of butterfly plate sealing surface is to be the centre of sphere of the point of L with center and distance vertical and by the working seal face, is the sphere of radius with R.

The utility model is non-resilient, non-rigid structure owing to its sealing ring, metal mold Be equipped with on the external diameter of valve seat insert and the internal diameter between groove and end face cover have one high temperature resistant, The soft graphite circle of high pressure, thereby guaranteed to make the close contact of spherical butterfly valve butterfly plate End face can not produce seepage, makes the product can be in t=-50～+ 500 ℃, PN≤4.0Mpa Lower long-time running, when adopting polytetrafluoroethylene (PTFE) to make sealing ring, also can t=-50～+ 200 ℃, long-time running under PN≤4Mpa. The utility model is simple in structure, and operation economizes Power, good seal performance has high temperature resistant, high pressure, and anti abrasive characteristics are applicable to Use on the pipeline of water, oil product, steam, coal gas and active sulfur body medium.

Claims (4)

1, a kind of high-performance butterfly valve, by valve body (1), butterfly plate (5), rotating shaft (4) and (7), and sealing seat (11) is formed, it is characterized in that butterfly plate (5) is two eccentric sphericals, sealing surface is a sphere, and a seal ring (8) and cover (17) and a pressure ring (9) are arranged between sealing seat (11) and the butterfly plate (5).

2, butterfly valve according to claim 1 is characterized in that described seal ring is meant metal mold or teflon type.

3, butterfly valve according to claim 1 and 2 is characterized in that on the external diameter of metal mold seal ring and the internal diameter groove a and groove b being arranged respectively.

4, butterfly valve according to claim 1, the material of cover (7) is an Expanded graphite between it is characterized in that.

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