Product model: ZMAN, ZJHN
Nominal diameter: DN25 ~ 300mm
Pressure range: PN1.6 ~ 6.4Mpa
Temperature range: - 40 ℃ ~ + 450 ℃
Flange size: GB / T9113.2-2000
Valve body type: double seat straight through type
Valve material: WCBZG230-450、ZG1Cr18Ni9Ti
Valve core material: 1Cr18Ni9Ti(304) or stellite alloy surfacing
Sealing packing: V-type polytetrafluoroethylene (F4), flexible graphite, stainless steel bellows
PRODUCT OVERVIEW
The pneumatic diaphragm double seat regulating valve is composed of a multi spring pneumatic diaphragm actuator and a straight through double guide double seat valve. It has the characteristics of compact structure, light weight, sensitive action, small pressure drop loss, large valve capacity and accurate flow characteristics. The compressed air drives the valve stem and spool to control the flow medium and realize the automatic regulation and control of the fluid medium in the process pipeline, It is applicable to clean media occasions where the leakage requirements are not strict and the pressure difference between the front and back of the valve is large. It is widely used in petroleum, chemical industry, pharmacy, metallurgy, power station and other industrial control fields, mainly controlling gas, liquid, steam and other media.
STRUCTURAL FEATURES
1. The pneumatic thin film actuator is equipped with positioner to accurately adjust and control the process parameters of fluid medium;
2. Positive action of actuator: air closed - normally open type (valve position moves downward when signal pressure increases), type B;
3. Actuator reaction: air open normally closed type (the valve position moves upward when the signal pressure increases), type K;
4. Double seat plunger valve core is suitable for occasions with large differential pressure, large flow, not very clean medium and lax leakage requirements.
MAIN TECHNICAL PARAMETERS
| Nominal diameter(DN) | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seat diameter(dn) | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | |
| Rated flow coefficient(KV) | straight line | 12.5 | 19.5 | 30.5 | 48.4 | 76 | 125 | 195 | 305 | 484 | 760 | 1000 | 1600 |
| Equal percentage | 11 | 17,6 | 27.5 | 44 | 69 | 110 | 176 | 275 | 440 | 690 | 900 | 1300 | |
| Allowable differential pressure(MPa) | ≤ Nominal pressure | ||||||||||||
| Nominal pressure(MPa) | 1.6、2.5、4.0、6.4、10.0 | ||||||||||||
| Rated stroke(mm) | 16 | 25 | 40 | 60 | 100 | ||||||||
| Matching actuator model | ZHA/B-22 | ZHA/B-23 | ZHA/B-34 | ZHA/B-45 | ZHA/B-56 | ||||||||
| Bonnet form | Standard type (- 17 ~ + 250 ℃), high temperature type (+ 250 ~ + 450 ℃), low temperature type (- 40 ~ - 196 ℃), bellows sealing type (- 40 ~ + 350 ℃) | ||||||||||||
| Gland type | Bolt compression type | ||||||||||||
| Sealing packing | V-type PTFE packing, V-type flexible graphite packing | ||||||||||||
| Spool form | Double seat plunger guide valve core | ||||||||||||
| Flow characteristics | Straightness, equal percentage | ||||||||||||
TECHNICAL PARAMETERS OF ACTUATOR
ambient temperature
| Configure actuator category | ZHA/B Multi spring thin film actuator | ||||
|---|---|---|---|---|---|
| Actuator model | 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" | ||||
| -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 | base | WCB | 304 | 316 | 316L |
|---|---|---|---|---|---|
| 2 | Valve body | WCB | 304 | 316 | 316L |
| 3 | Spool | 304 | 304 | 316 | 316L |
| 4 | Valve seat | 304 | 304 | 316 | 316L |
| 5 | Copper sleeve | Brass | |||
| 6 | Guide sleeve | 304 | 304 | 316 | 316L |
| 7 | Shim | PTFE\Graphite gasket | PTFE\Graphite gasket | PTFE\Graphite gasket | PTFE\Graphite gasket |
| 8 | Valve cover | WCB | 304 | 316 | 316L |
| 9 | Valve stem | 304 | 304 | 316 | 316L |
| 10 | Filler | PTFE/Graphite | PTFE/Graphite | PTFE/Graphite | PTFE/Graphite |
| 11 | Packing gland | WCB | 304 | 316 | 316L |
| 12 | Bolt | 25 | 0Cr18Ni9Ti | 1Cr18Ni9Ti | 1Cr18Ni9Ti |
MAIN PERFORMANCE INDEXES
| 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) | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L | PN16/25 | 185 | 200 | 220 | 250 | 275 | 300 | 350 | 410 | 450 | 550 | 670 | 770 |
| PN40 | 190 | 210 | 230 | 255 | 285 | 310 | 355 | 425 | 460 | 560 | 740 | 805 | |
| PN64 | 200 | 210 | 235 | 265 | 295 | 320 | 370 | 440 | 475 | 570 | 750 | 820 | |
| H | PN16/25 | 117 | 120 | 139 | 144 | 188 | 208 | 220 | 268 | 278 | 320 | 441 | 503 |
| PN40 | 124 | 128 | 145 | 150 | 195 | 220 | 230 | 280 | 290 | 335 | 465 | 528 | |
| PN64 | 130 | 135 | 155 | 170 | 205 | 240 | 255 | 295 | 310 | 360 | 480 | 550 | |
| H1 | 165 | 185 | 185 | 205 | 245 | 255 | 270 | 335 | 365 | 430 | 560 | 680 | |
| H2 | 298 | 298 | 298 | 298 | 380 | 380 | 380 | 510 | 510 | 510 | 650 | 650 | |
| H3 | 177 | 177 | 177 | 177 | 182 | 182 | 182 | 182 | 182 | 218 | 218 | 218 | |
| L1 | 280 | 280 | 280 | 280 | 350 | 350 | 350 | 475 | 475 | 475 | 560 | 560 | |
| A | 282 | 282 | 282 | 282 | 360 | 360 | 360 | 470 | 470 | 470 | 580 | 580 | |
| D | 220 | 220 | 220 | 220 | 270 | 270 | 270 | 320 | 320 | 320 | 400 | 400 | |
