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GD
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GD
High Vacuum Flapper Valve
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GD high vacuum flapper valve is used to put through or cut off the airflow in vacuum pipeline. Applicable medium can be pure air and noncorrosive gases. According to its shaft seal structure, high vacuum flapper valve is classified into GD-J rubber shaft seal type and GD-J(b)bellows shaft seal type. According to its put-through type, it is classified into GD-J angle type and GD-S three-way type with prepumping.
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Main Technical Performance
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Applicability
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105～1.3×10-4Pa(The rubber seal)
105～1.3×10-5Pa(Seal for the bellows)
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Valve Leak Rate
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≤1.3×10-4Pa.L/S.(The rubber seal)
≤1.3×10-5Pa.L/S.(Seal for the bellows)
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Applicable Temperature
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-25～+80℃(NBR)
-30～+150℃(Viton)
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Materials of Main Parts
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Body, bonnet and stem: aluminium alloy, carbon steel or stainless steel
Sealing element: NBR, Viton, bellows(shaft seal)
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CONSTRUCTION FIGHTS(mm)
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Overall and Connection Dimensions(mm)
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Quick release flange
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Model
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DN
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D1
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D
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A
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H
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P
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Flange Standard
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GD-J10(b)
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10
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12.2
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30
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40
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124.5
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60
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GB4982
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GD-J16(b)
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16
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17.2
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30
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40
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124.5
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60
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GD-J25(b)
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25
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26.2
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40
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50
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134.5
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78
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GD-J32(b)
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32
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34.2
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55
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58
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153
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78
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GD-J40(b)
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40
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41.2
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55
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65
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160.5
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78
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GD-J50(b)
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50
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52.2
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75
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70
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203
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78
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Looper flange
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Model
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DN
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D1
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Do
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D2
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A
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P
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H
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n-φc
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DnyPre-pumping port
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Flange Standard
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GD-J50
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50
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110
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90
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55
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70
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78
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203
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4-φ9
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GB6070
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GD-J63
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63
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130
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110
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68
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88
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160
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380
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4-φ9
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GD-J80
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80
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145
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125
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85
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98
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160
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400
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8-φ9
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GD-J100
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100
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165
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145
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105
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108
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160
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420
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8-φ9
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GD-J(S)160
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160
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225
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200
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165
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158
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160
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575
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8-φ11
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DN40 GB4982
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GD-J(S)200
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200
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285
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260
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208
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200
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160
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655
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12-φ11
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DN50 GB6070
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GD-J(S)250
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250
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335
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310
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258
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208
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250
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690
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12-φ11
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DN63 GB6070
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GD-J(S)320
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320
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425
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395
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328
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250
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250
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785
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12-φ14
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DN80 GB6070
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GD-J(S)150
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150
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220
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195
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156
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158
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160
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575
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8-φ12
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DN40 GB4982
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JB919
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GD-J(S)300
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300
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380
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350
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308
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250
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250
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785
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8-φ14
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DN80 GB6070
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JB919
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