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Pneumatic single seat control valve product description
ZJHP pneumatic diaphragm single-seat regulating valve is composed of a multi-spring pneumatic diaphragm actuator and a low flow resistance precision small single-seat regulating valve body. The pneumatic single-seat regulating valve has a compact structure, light weight, sensitive movement, pressure The advantages of low loss, large valve capacity, accurate flow characteristics, and easy maintenance make it suitable for harsh working conditions. Multi-spring actuators are low height, light weight and easy to equip. Pneumatic single-seat control valve is equipped with a valve positioner to convert the current signal into a corresponding linear displacement and automatically control the opening of the regulating valve to achieve continuous adjustment of the process parameters such as pressure, flow, temperature and liquid level of the fluid in the pipeline. . Pneumatic diaphragm single-seat control valve is widely used in precise control of gases, liquids, steam and other media, and is especially suitable for work places where the pressure difference is small and the allowable leakage is small.
Pneumatic diaphragm single-seat control valve has stable operation, reliable operation characteristics, tiny valve seat leakage, accurate flow characteristics, and wide adjustable range. It will surely achieve high quality control effects in a wide range of applications with unique advantages.
| Nominal diameter(DN) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | |
| Valve seat diameter(DN) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | |
| Rated flow coefficient(KV) |
straight line | 6.9 | 11 | 17.6 | 27.5 | 44 | 69 | 110 | 176 | 275 | 440 | 630 | 875 | 1250 |
| Equal percentage | 6.3 | 10 | 16 | 25 | 40 | 63 | 100 | 160 | 250 | 360 | 570 | 850 | 1180 | |
| Allowable pressure difference(MPa) | 3.2 | 3.0 | 2.0 | 1.8 | 1.5 | 1.4 | 1.0 | 0.7 | 0.6 | 0.5 | 0.3 | 0.2 | 0.1 | |
| Nominal pressure(MPa) | 1.6、2.5、4.0、6.4、10.0 | |||||||||||||
| Rated route(mm) | 16 | 25 | 40 | 60 | 100 | |||||||||
| With actuator type | ZHA/B-22 | ZHA/B-23 | ZHA/B-34 | ZHA/B-45 | ZHA/B-56 | |||||||||
| Valve cover form | standard type(-17～+250℃)、High temperature type(+250～+450℃)、Low temperature type(-40～-196℃)、Bellows sealed type(-40～+350℃) | |||||||||||||
| Capping form | Bolt compression type | |||||||||||||
| Seal packing | V type PTFE packing、V type flexible graphite filler | |||||||||||||
| Valve body material | Cast Steel (WCB), Stainless Steel (CF8, CF8M, CF3, CF3M), Chrome Molybdenum Steel, Cast Steel Backing PTFE (WCB+F46) | |||||||||||||
| Valve core form | single seat Plunger type valve core |
| Flow characteristics | Linear, equal percentage |
| valve core material | stainless steel (304、316、316L) |
| Actuator type | ZHA/B Multi-spring film actuator | ||||
| Actuator model | ZHA/B-22 | ZHA/B-23 | ZHAB-34 | ZHA/B-45 | ZHA/B-56 |
| Effective area(cm2) | 350 | 350 | 560 | 900 | 1400 |
| route (mm) | 10、16 | 25 | 40 | 40、60 | 100 |
| Spring range(KPa) | 20～100（standard）、20～60、60～100、40～200、80～240 | ||||
| Diaphragm material | Nitrile rubber clip nylon cloth, ethylene propylene rubber clip nylon cloth | ||||
| Air supply pressure | 140～400KPa | ||||
| Air interface | RC1/4" | ||||
| Ambient temperature | -30～+70℃ | ||||
| equipped with accessories | Locator, air filter pressure reducer, retention valve, hand wheel mechanism, etc. | ||||
| Form of action | Air-to-close (B)—Valve open (FO) when deaeration; Air-opening (K)—Valve off (FC) when deaeration | ||||
| Item | Without positioner | With positioner | ||
| Basic error % | ±5.0 | ±1.0 | ||
| Backlash % | ≤3.0 | ≤1.0 | ||
| dead zone % | ≤3.0 | ≤0.4 | ||
| Starting to end point deviation % |
Air open | Starting point | ±2.5 | ±1.0 |
| Starting point | ±5.0 | ±1.0 | ||
| Air shut | Starting point | ±5.0 | ±1.0 | |
| end point | ±2.5 | ±1.0 | ||
| Rated route deviation % | ≤2.5 | |||
| Leakage L/h | 0.01%× Valve rated capacity | |||
| Adjustable range R | 50：1 | |||
