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| Material | Description | Recommended Applications |
|---|---|---|
| Ductile Iron (DI) | Economical with excellent strength and durability for general service. | Water treatment, municipal water, HVAC, fire protection |
| Carbon Steel (WCB) | High mechanical strength for elevated pressure and temperature applications. | Oil & gas, petrochemical, power generation |
| CF8 (SS304) | Good corrosion resistance for clean water and mildly corrosive media. | Food processing, industrial water, general chemical service |
| CF8M (SS316) | Superior corrosion resistance against chlorides and aggressive chemicals. | Chemical processing, marine, pharmaceutical |
| Aluminum Bronze | Excellent resistance to seawater corrosion, cavitation, and erosion. | Marine, desalination, offshore, seawater cooling systems |
| Material | Description | Recommended Applications |
|---|---|---|
| Plated Ductile Iron | Cost-effective with enhanced corrosion resistance for general service. | Municipal water, HVAC, irrigation |
| CF8 (SS304) | Reliable corrosion resistance for potable water and industrial applications. | Water treatment, food & beverage |
| CF8M (SS316) | Excellent resistance to seawater, chlorides, and chemical media. | Chemical processing, marine, pharmaceutical |
| Duplex Stainless Steel | High strength with exceptional resistance to pitting and stress corrosion. | Offshore, desalination, chemical plants |
| Aluminum Bronze | Outstanding wear resistance and excellent performance in seawater. | Marine engineering, shipbuilding |
| Nylon Coated Disc | Low-friction coating with improved wear and corrosion resistance. | Water supply, HVAC, general industrial service |
| PTFE Lined Disc | Provides superior protection against highly corrosive chemicals and aggressive media. | Chemical processing, acids, alkalis, pharmaceutical |
| Material | Description | Recommended Applications |
|---|---|---|
| SS420 | High strength and hardness with excellent wear resistance. | General industrial, water treatment, HVAC |
| SS316 | Superior corrosion resistance for aggressive media and seawater service. | Chemical processing, marine, desalination |
| 17-4PH Stainless Steel | High tensile strength and excellent fatigue resistance for demanding applications. | High-pressure systems, automated valves, power generation |
| Duplex Stainless Steel | Combines high mechanical strength with exceptional corrosion resistance. | Offshore, seawater, chemical and mining industries |
Laux Valve offers multiple body, disc, and shaft material combinations to meet different media, temperatures, pressures, and environmental conditions. Our engineering team can recommend the optimal material configuration for your specific application, ensuring reliable sealing, extended service life, and cost-effective performance.
All concentric lug butterfly valves and wafer butterfly valves are equipped with complete opening-angle Kv flow coefficient table and GPM-PSI pressure drop nomograph, supporting metric & imperial dual-system pipeline design calculation for global industrial projects. Flow coefficient Kv represents the fluid throughput capacity of the valve; higher Kv value brings lower pipeline pressure loss and less operation energy consumption.
| DN | 10° | 20° | 30° | 40° | 50° | 60° | 70° | 80° | 90° Full Open |
|---|---|---|---|---|---|---|---|---|---|
| 50 | 0.1 | 5 | 12 | 24 | 45 | 64 | 90 | 125 | 135 |
| 65 | 0.2 | 8 | 20 | 37 | 65 | 98 | 144 | 204 | 220 |
| 80 | 0.3 | 12 | 22 | 39 | 70 | 116 | 183 | 275 | 302 |
| 100 | 0.5 | 17 | 36 | 78 | 139 | 230 | 364 | 546 | 600 |
| 125 | 0.8 | 29 | 61 | 133 | 237 | 392 | 620 | 930 | 1022 |
| 150 | 2 | 45 | 95 | 205 | 366 | 605 | 958 | 1437 | 1579 |
| 200 | 3 | 89 | 188 | 408 | 727 | 1202 | 1903 | 2854 | 3136 |
| 250 | 4 | 151 | 320 | 694 | 1237 | 2047 | 3240 | 4859 | 5340 |
| 300 | 5 | 234 | 495 | 1072 | 1911 | 3162 | 5005 | 7507 | 8250 |
| 350 | 6 | 338 | 715 | 1549 | 2761 | 4568 | 7230 | 10844 | 11917 |
| 400 | 8 | 464 | 983 | 2130 | 3797 | 6282 | 9942 | 14913 | 16388 |
| 450 | 11 | 615 | 1302 | 2822 | 5028 | 8320 | 13168 | 19752 | 21705 |
| 500 | 14 | 791 | 1674 | 3628 | 6465 | 10698 | 16931 | 25396 | 27908 |
| 600 | 24 | 1222 | 2587 | 5605 | 9989 | 16528 | 26157 | 39236 | 43116 |
Table Instruction: Small opening 10°~30° for precise flow throttling; medium opening 40°~70° for circulating water regulation; 90° full open delivers maximum Kv value with minimum flow resistance for main pipeline isolation.
Figure 1: Flow Rate & Pressure Drop Nomograph for Concentric Butterfly Valve
The pressure drop curve chart adopts US imperial units, with horizontal axis for flow rate GPM and vertical axis for differential pressure (PSI / Feet water head). Diagonal slant lines correspond to matching Kv/Cv flow coefficients, helping North American and ANSI standard clients quickly calculate pipeline medium pressure loss.
