Product model: ZAMDW (P / M)
Nominal diameter: DN20 ~ 200mm
Pressure range: PN1.6 ~ 6.4Mpa
Service temperature: low temperature type - 40 ~ - 196 ℃, ultra-low temperature type - 196 ~ - 254 ℃
Manufacturing standard: JB / T7248-1994
Technical standard: GBT 24925-2016
Flange standard: GB / T12234-2007
Structure length: GB / T12221-2005
Valve material: stainless steel, CF3M, CF8M
Body type: straight through single seat spherical valve
PRODUCT OVERVIEW
The pneumatic diaphragm low temperature regulating valve is composed of a multi spring pneumatic actuator, a single seat regulating valve body and an extension rod. Valve bodies, fittings and extension rods are all subject to special low-temperature treatment and are mainly used for industrial storage tanks or pipelines of low-temperature media (minus - 40 ℃ ~ - 196 ℃ ~ - 254 ℃), such as LO2, LN2, LAR, LNG, LPG, lc2h4 liquid oxygen, liquid nitrogen, liquefied natural gas, liquid carbon dioxide, liquid propane, liquid methane, etc, The signal input (4 ~ 20mA) given by the valve positioner is sent to the air chamber of the pneumatic membrane actuator to generate thrust. The valve core is driven through the connecting rod to change the position and flow cross-sectional area of the valve core, so as to control and adjust the medium flow.
MAIN TECHNICAL PARAMETERS
| Nominal diameter(DN) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seat diameter(dn) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | |
| Rated flow coefficient(KV) | Single seat | 6.9 | 11 | 17.6 | 27.5 | 44 | 69 | 110 | 176 | 275 | 440 | 630 |
| Sleeve | 6.3 | 10 | 16 | 25 | 40 | 63 | 100 | 155 | 250 | 370 | 580 | |
| Allowable differential pressure(MPa) | Single seat | 3.8 | 3.2 | 3.0 | 2.0 | 1.8 | 1.5 | 1.4 | 1.0 | 0,7 | 0.6 | 0.5 |
| Sleeve | 6.4 | 6.4 | 5.2 | 5.2 | 4.6 | 4.6 | 3.7 | 3.7 | 3.5 | 3.1 | 3.1 | |
| Nominal pressure(MPa) | 1.6、2.5、4.0、6.4 | |||||||||||
| Rated stroke(mm) | 16 | 25 | 40 | 60 | ||||||||
| Actuator model | ZHA/B-22 | ZHA/B-23 | ZHA/B-34 | ZHA/B-45 | ||||||||
| Bonnet form | Low temperature type - 10 ~ - 196 ℃, ultra-low temperature type - 196 ~ - 254 ℃ | |||||||||||
| Gland type | Bolt compression type | |||||||||||
| Sealing packing | Low temperature polytetrafluoroethylene, V-type polytetrafluoroethylene filler | |||||||||||
| Spool form | Single seat type, sleeve type | |||||||||||
| Flow characteristics | Equal percentage, linear | |||||||||||
TECHNICAL PARAMETERS OF ACTUATOR
Actuator model
| Configure actuator category | ZHA/BMulti spring thin film actuator | ||||
|---|---|---|---|---|---|
| ZHA/B-22 | ZHA/B-23 | ZHA/B-34 | ZHA/B-45 | ZHA/B-56 | |
| Effective area(cm2) | 350 | 350 | 560 | 900 | 1400 |
| Trip(mm) | 10、16 | 24 | 40 | 40、60 | 100 |
| Spring range（KPa） | 20～100（standard）、20-60、60-100、40-200、80-240 | ||||
| Diaphragm material | Nitrile rubber with nylon cloth, ethylene propylene rubber with nylon cloth | ||||
| Air supply pressure | 140～400KPa | ||||
| Air connection | RC1/4" | ||||
| Ambient temperature | -30～+70℃ | ||||
| Accessories available | Positioner, air filter pressure reducer, holding valve, travel switch, valve position transmitter, hand wheel mechanism, etc | ||||
| Action form | Air off (B) - valve position open (FO) in case of gas loss; Gas open (K) - valve position closed (FC) in case of loss of gas | ||||
MATERIAL OF MAIN PARTS
| 1 | Valve body | WCB | 304 | 316 | 316L |
|---|---|---|---|---|---|
| 2 | shim | PTFE\Graphite gasket | PTFE\Graphite gasket | PTFE\Graphite gasket | PTFE\Graphite gasket |
| 3 | Seat / sleeve | 304 | 304 | 316 | 316L |
| 4 | spool | 304 | 304 | 316 | 316L |
| 5 | Guide sleeve / cap | 304 | 304 | 316 | 316L |
| 6 | Middle cushion | PTFE\Graphite gasket | PTFE\Graphite gasket | PTFE\Graphite gasket | PTFE\Graphite gasket |
| 7 | Valve cover | WCB | 304 | 316 | 316L |
| 8 | Valve stem | 304 | 304 | 316 | 316L |
| 9 | Heat shield | Carbon steel | 304 | 316 | 316L |
| 10 | Filler | PTFE/Graphite | PTFE/Graphite | PTFE/Graphite | PTFE/Graphite |
| 11 | Bolt | 25 | Stainless steel | Stainless steel | Stainless steel |
| 12 | Packing gland | WCB | 304 | 316 | 316L |
MAIN PERFORMANCE PARAMETERS
| Project | Without positioner | With locator | ||
|---|---|---|---|---|
| Basic error% | ±5.0 | ±1.0 | ||
| Return difference% | 3.0 | 1.0 | ||
| Deadband% | 3.0 | 0.4 | ||
| Deviation from starting point% | Gas on | Starting point | ±2.5 | ±1.0 |
| Starting point | ±5.0 | ±1.0 | ||
| Gas off | Starting point | ±5.0 | ±1.0 | |
| end | ±2.5 | ±1.0 | ||
| Rated stroke deviation% | ≤2.5 | |||
| Leakage L / h | 0.01% × Valve rated capacity | |||
| Adjustable range R | 30：1 | |||
MAIN CONNECTION DIMENSIONS
| Nominal diameterDN(mm) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L | PN16/25 | 181 | 184 | 200 | 222 | 254 | 276 | 298 | 352 | 410 | 451 | 600 |
| PN40 | 194 | 197 | 200 | 235 | 267 | 292 | 317 | 368 | 425 | 473 | 610 | |
| PN64 | 206 | 200 | 210 | 251 | 286 | 311 | 337 | 394 | 440 | 508 | 650 | |
| H | PN16/25 | 52.5 | 57.5 | 75 | 75 | 85.5 | 92.5 | 100 | 110 | 142.5 | 158 | 170 |
| PN40 | 52.5 | 57.5 | 75 | 75 | 82.5 | 92.5 | 100 | 117.5 | 150 | 167.5 | 187.5 | |
| PN64 | 65 | 40 | 85 | 85 | 90 | 102.5 | 107.5 | 125 | 172.5 | 195 | 207.5 | |
| H1 | Design the extension rod size of pneumatic low temperature regulating valve according to the actual minimum temperature on site | |||||||||||
| H2 | 298 | 298 | 298 | 298 | 298 | 380 | 380 | 380 | 510 | 510 | 510 | |
| H3 | 180 | 180 | 180 | 180 | 180 | 236 | 236 | 236 | 310 | 310 | 310 | |
| L1 | 289 | 289 | 289 | 289 | 289 | 347 | 347 | 347 | 476 | 476 | 476 | |
| A | 282 | 282 | 282 | 282 | 282 | 360 | 360 | 360 | 470 | 470 | 470 | |
| D | 220 | 220 | 220 | 220 | 220 | 270 | 270 | 270 | 320 | 320 | 320 | |
