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| Brand Name: | SONGO |
| MOQ: | 1 Piece |
| Price: | USD$ 387/Piece |
| Payment Terms: | L/C,D/A,D/P,T/T,Western Union |
| Supply Ability: | 5000-10,000Pieces/Month |
Overview of Pneumatic Diaphragm SS304 Double Seat Control Valve:
Pneumatic double seat control valve has the characteristics of compact structure, large valve capacity, accurate flow characteristics, etc., can be used for harsh working conditions, rated flow coefficient than the same diameter of the single seat valve, but the leakage is also larger than the single seat valve. Suitable for leakage requirements are not strict, valve before and after the pressure difference is large clean media occasions, widely used in petroleum, chemical, pharmaceutical, metallurgy, power plant and other industrial control departments, mainly control gas, liquid, steam and other media.
Working principle of pneumatic double seat control valve: pneumatic double seat control valve, the seat has two spool, the fluid flow from the left side of the valve body, through the valve seat and spool, from the right outflow. It is the same as the nominal size of the single seat regulator can flow through more media, flow capacity increased about 20%~25%. The force of the medium acting on the upper and lower spool can cancel each other, so the unbalance force is small and the operating pressure difference is large.
Comparison of Pneumatic Double Seat Control Valve And Pneumatic Single Seat Control Valve:
Pneumatic control valve as one of the most commonly used valve production process automation control system, many users in the selection of time are usually easy to wrong "hands", because of the different working conditions, the corresponding control valve products is not the same, for different process conditions, select different regulating valve is the key to control the process parameters. For example, the most common pneumatic double seat control valve and pneumatic single seat control valve, because of their different structure forms, the corresponding use of the occasion is not the same!
Main Components Material Of Stainless Steel Carbon Steel Pneumatic Double Seat Control Valve :
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MATERIAL SPECIFICATION
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Valve body
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WCB/WCC/WC6/CF8/CF8M/CF3M
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Bonnet
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WCB/WCC/WC6/CF8/CF8M/CF3M
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Valve spool
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304/316/316L(overlaying stellite alloy)
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Seat
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304/316/316L(overlaying stellite alloy)
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Packing
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Normal: -196°C～+230°C is PTFE, Special: ＞230°C is flexible graphite
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Bellows
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SS304/316/316L
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Gasket
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Normal: stainless steel with flexible graphite, Special: metal tooth type gasket
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Valve stem
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2Cr13/17-4PH/304/316/316L
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Diaphragm cover
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Normal: Q235, Special: SS304
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Diaphragm
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NBR with reinforced polyester fabric
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Spring
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Normal: 60Si2Mn, Special: 50CrVA
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Main Features ( Accord With GB/T 4213-2008 Standard) Of Pneumatic Control Valve:
| Main Features ( Accord With GB/T 4213-2008 Standard) | |||||
| No. | Item | Without Positioner | Positioner | ||
| Standard Type | Heat Dissipation / Cryogenic Type | ||||
| 1 | Intrinsic Error<(%) | ±8.0 | ±1.5 | ±2.5 | |
| 2 | Hysteresis Error<(%) | - | 1.5 | 2.5 | |
| 3 | Dead Band<(%) | 6 | 0.6 | 1 | |
| 4 | Initial Point Deviation | Air to Open | ±4.0 | ±2.5 | ±2.5 |
| Air to Close | - | ±2.5 | ±2.5 | ||
| 5 | End Point Deviation | Air to Open | - | ±2.5 | ±2.5 |
| Air to Close | ±4.0 | ±2.5 | ±2.5 | ||
| 6 | Rated Stroke Deviation<(%) | +4.0 | +2.5 | 2.5 | |
| 7 | Permitted Leakage Volume | Hard Seal | Level IV | ||
| Soft Seal | Level VI | ||||
Main Technical Data Of Pneumatic Diaphragm Double Seat Control Valve:
| Main Technical Data | ||||||||||||||||||
| Nominal Diameter (Inch) | 3/4" | 1" | 1-1/4" | 1-1/2" | 2" | 2-1/2" | 3" | 4" | 5" | 6" | 8" | |||||||
| Nominal Diameter (mm) | 3/4" 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | |||||||
| Seat Diameter DN(mm) | 5 | 7 | 8 | 10 | 12 | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | |
| Rated flow coefficient Kv(m³/h) |
Linearity | 0.2 | 0.5 | 0.8 | 1.8 | 2.8 | 4.4 | 6.9 | 11 | 17 | 27 | 44 | 69 | 110 | 176 | 275 | 440 | 690 |
| Equal Percentage | - | - | - | 1.6 | 2.5 | 4 | 6.3 | 10 | 16 | 25 | 40 | 63 | 100 | 160 | 250 | 400 | 630 | |
| Rated Stroke L (mm) | 10 | 16 | 25 | 40 | 60 | |||||||||||||
| Actuator Model (Direct Acting) | SGMA-1 | SGMA-2 | SGMA-3 | SGMA-4 | ||||||||||||||
| Actuator Model (Reverse Acting) | SGMB-1 | SGMB-2 | SGMB-3 | SGMB-4 | ||||||||||||||
| Working Temperature (°C) | Standard Type | -20°C～230°C | ||||||||||||||||
| Heat Dissipation Type | 230°C～350°C(Cast Steel) / 230°C～450°C(Stainless Steel) | |||||||||||||||||
| High Temp Type | 450°C～595°C | |||||||||||||||||
| Cryogenic Type | -60°C～-100°C / -100°C～-196°C | |||||||||||||||||
| Cut-off Type | -20°C～150°C(PTFE Seal) / -20°C～230°C(PPL Seal) | |||||||||||||||||
| Bellows Type | -20°C～350°C / -20°C～150°C(PTFE Seal) / -20°C～230°C(PPL Seal) / -60°C～-100°C / -100°C～-196°C | |||||||||||||||||
| Nominal Pressure PN | Bar | 16/25/40/63/100 | ||||||||||||||||
| LB | ANSI: CL150LB / 300LB /600LB | |||||||||||||||||
External Dimension Of Stainless Steel 316 Pneumatic Diaphragm Double Seat Control Valve:
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DN
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Inch
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L
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H
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H1
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H2
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H3
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L1
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A
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D
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PN16
PN25
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PN40
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PN64
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PN16
PN25
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PN40
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PN64
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25
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1"
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185
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190
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200
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117
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124
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130
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165
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298
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177
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280
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282
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220
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32
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1-1/4"
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200
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210
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210
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120
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128
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135
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185
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298
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177
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280
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282
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220
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40
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1-1/2"
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220
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230
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235
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139
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145
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155
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185
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298
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177
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280
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282
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220
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50
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2"
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250
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255
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265
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144
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150
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170
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205
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298
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177
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280
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282
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220
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65
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2-1/2"
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275
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285
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295
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188
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195
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205
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245
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380
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182
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350
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360
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270
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80
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3"
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300
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310
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320
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208
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220
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240
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255
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380
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182
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350
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360
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270
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100
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4"
|
350
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355
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370
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220
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230
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255
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270
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380
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182
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350
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360
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270
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125
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5"
|
410
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425
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440
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268
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280
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295
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335
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510
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182
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475
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470
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320
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|
150
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6"
|
450
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460
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475
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278
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290
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310
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365
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510
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182
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475
|
470
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320
|
|
200
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8"
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550
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560
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570
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320
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335
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360
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430
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510
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218
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475
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470
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320
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|
250
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10"
|
670
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740
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750
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441
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465
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480
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560
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650
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218
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560
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580
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400
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300
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12"
|
770
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805
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820
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503
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528
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550
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680
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650
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218
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560
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580
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400
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Pneumatic Diaphragm Actuator Acting Comparison:
| Direct Acting (Air To Close) | Reverse Acting (Air To Open) |
| Spindle Movement With Increase In Air Pressure | Spindle Movement With Increase In Air Pressure |
| Spring Retract Normally Open | Spring Extend Normally Closed |
| Fail To Close FO | Fail To Close FC |
29 Years Valve Factory Founded In 1996:
Good Feedback From 12382 Clients:
No Worries After Buy Our Valves With Our Engineers:
R & D Team Technical Supporting:
Frequently Asked Questions:
