What’s the Eccentric semi-ball valve used for?

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The eccentric semi-ball valve is consist of the valve body, eccentric shaft, valve cover, semi-ball, bushings, valve seat, and other parts, it rotates the eccentric shaft by 90 °to open/close the valve to cut off the medium, suitable for sewage disposal, petroleum, chemical, electricity and paper industries processing of slurry, slurry ash, paper pulp, alumina and other sealing tightness occasions, especially in two-phase flow medium. According to its installation structure, the eccentric semi-ball valve can be divided into a top entry eccentric semi-ball valve and side entry eccentric semi-ball valve.

The design of the eccentric ensures no friction between the valve seat and semi-ball during opening or closing, extending the valve serving life. There is a certain eccentricity between the rotation of the eccentric axis and the center of the valve body, that is, the half-ball changes the axial displacement with the change of angular displacement when it is opened and closed so that they are in a linear proportional relationship, and its motion path is a semi-parabolic trajectory. The trajectory of the hemispheric body from the lowest point to the highest point automatically wedges the seat, and the seat also automatically generates a preload depending on the elastic modulus of the material to close tightly.

Eccentric semi ball valve provides many advantages like, simple structure, lightweight, small resistance and torque, tight sealing, easy online maintenance, just open the valve cover and take out the eccentric shaft. The semicircular port has good flow performance and linear regulation performance, and impurities will not be deposited in the valve body cavity. In addition, she has the function of cutting, that is, in the closing of the media can be cut off debris, to ensure the normal opening and closing of the valve. The semi-ball and seat of the valve can be surfacing with different alloys to meet the needs of different occasions.

 

Design and manufacture: MSS SP-108

Size: DN2″-40″

PN: CLASS150-CLASS900

 

Materials

Part Material
Valve body WCB、A105
Shaft 420、410
Disc Nitriding steel, wear-resistant steel
Seat Nitriding steel, wear-resistant steel
Bearing Aluminum – bronze
Packing PTFE、Flexible graphite

 

Specifications

PN（Mpa） 0.6 1.0 1.6 2.5 4.0
DN（mm） 40-600 40-600 40-600 40-600 40-600
Sealing test pressure（Mpa） 0.66 1.1 1.76 2.75 4.4
Body test pressure（Mpa） 0.9 1.5 2.4 3.75 6.0
Working temperature（℃） －29～300、－29～425、－29～540
Medium Liquids like seawater, sewage, acid and alkali or slurry, steam, gas, oil, mud, ash etc.
Operation Handwheel, electric, pneumatic
Connection Flanged, wafer
Installation Vertical and horizontal

 

Size

PN(MPa) DN(mm) Size (mm)
d1 L D D1 D2 D6 f f2 b Z-φd H1 H2
1.6 25 25 150 115 85 65 – 2 – 14 44 – 75
32 32 165 135 100 78 – 2 – 16 48 – 105
40 40 180 145 110 85 – 3 – 16 48 – 95
50 50 200 160 125 100 – 3 – 16 48 – 107
65 65 220 180 145 120 – 3 – 18 48 – 142
80 80 250 195 160 135 – 3 – 20 88 – 152
100 100 280 215 180 155 – 3 – 20 88 – 178
125 125 320 245 210 185 – 3 – 22 88 – 252
150 150 360 280 240 210 – 3 – 24 8-23 – 272
200 200 400 335 295 265 – 3 – 26 12-23 – 342
2.5 25 25 150 115 85 65 – 2 – 16 44 – 75
32 32 165 135 100 78 – 2 – 18 48 – 85
40 40 180 145 110 85 – 3 – 18 48 – 95
50 50 200 160 125 100 – 3 – 20 48 – 107
65 65 220 180 145 120 – 3 – 22 88 – 142
80 80 250 195 160 135 – 3 – 24 88 – 152
100 100 280 230 190 160 – 3 – 28 8-23 – 178
125 125 320 270 220 188 – 3 – 30 8-25 – 252
150 150 360 300 250 218 – 3 – 34 8-25 – 272
200 200 400 360 310 278 – 3 – 34 12-25 – 342
4.0 25 25 150 115 85 65 58 2 4 16 44 – 75
32 32 180 135 100 78 66 2 4 18 48 – 107
40 40 200 145 110 85 76 3 4 18 48 – 95
50 50 220 160 125 100 88 3 4 20 48 – 107
65 65 250 180 145 120 110 3 4 22 88 – 142
80 80 280 195 160 135 121 3 4 22 88 – 152
100 100 320 230 190 160 150 3 4.5 24 8-23 – 178
125 125 400 270 220 188 176 3 4.5 28 8-25 – 252
150 150 400 300 250 218 204 3 4.5 30 8-25 – 272
200 200 502 375 320 282 260 3 4.5 38 12-30 – 342

 

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