1. advanced equipment 2. strong commonality 3. compact form 4. reliable in use 5. matching spool are provided
It widely used in chemical, petroleum, power plants, light industry, textile, metallurgical industrial production.
pneumatic diaphragm double-seated control valve
Main parts materials: Valve body, valve cover: ZG230-450, ZGlCr18Ni9Ti Spool, the valve seat: 1Cr18Ni9T, Levin Titanium Alloy Welding Division + 1Cr18Ni9Ti
stuffing : PTFE flexible graphite PTFEGasket: Rubber,, graphite spiral wound gasket Membrane covered: A3 1Cr18Ni9TICorrugated Diaphragm: NBR folder enhanced polyester fabric Spring: 60Si2Mn Stem, putting: 2Cr13, 1Cr18Ni9Ti
| Specification and technical data | ||||||||||||
| DN | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | |
| rated flow coefficient Kv | line | 7.6 | 12.1 | 19.4 | 30.3 | 48.3 | 75.9 | 121 | 193.6 | 302.5 | 484 | 759 |
| percentage | 6.9 | 11 | 17.6 | 27.5 | 44 | 69.3 | 110 | 176 | 275 | 440 | 693 | |
| actuator | drect action | PZMA-4 | PZMA-5 | PZMA-6 | PZMA-7 | |||||||
| Reverse action actuator | PZMB-4 | PZMB-5 | PZMB-6 | PZMB-7 | ||||||||
| stroke | 16 | 25 | 40 | 60 | ||||||||
| diaphragm Ae(cm2) | 280 | 400 | 600 | 1000 | ||||||||
| PN | 1.6 4.0 6.4 10.0(Mpa) ANSI 150 300 400 600 | |||||||||||
| inheret flow coefficient | Linear percentage | |||||||||||
| inerent ajustment | 50 | |||||||||||
| signal(kpa) | 20-100 40-200 80-240 | |||||||||||
| air supply | 0.14 0.25 0.28 0.40 | |||||||||||
| Performance index | |||||||
| number | item | stanard control valve | hot&low temperature control valve | ||||
| no positioner | positioner | no positioner | positioner | ||||
| 1 | intrinsic error<(%) | ±5 | ±1 | ±15 | ±4 | ||
| 2 | Hysteresis<(%) | 3 | 1 | 10 | 3 | ||
| 3 | Dead<(%) | 3 | 0.4 | 8 | 1 | ||
| 4 | Deviation<(%) | open | start | ±2.5 | ±1 | ±6 | ±2.5 |
| end | ±5 | ±15 | |||||
| close | start | ±5 | ±15 | ||||
| end | ±2.5 | ±6 | |||||
| 5 | rated stroke deviation<(%) | ±2.5 | ±2.5 | ±6 | ±2.5 | ||
Ordering Information:1. Product name and model2. DN3. Rated flow coefficient KV4. Nominal pressure and differential pressure5. Valve and valve components of materials6. Connection7. Transmission8. Flow characteristics9. Suitable temperature
pneumatic diaphragm double-seated control valve (ANSI ,API,GB)
