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About us
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Welflow is a combined company of four factories whose products are complementary to each other.
In addition to the mainland China market, the products are exported to South Korea, Taiwan（China）, the United States, Singapore, Malaysia, Australia， and other countries and regions.
1. Fluid Media
This series of products are used for ordinary piping for steam, air, water, oil, and gas. (except flammable or toxic gas).
2. Pressure-Temperature Ratings
| Temperature ℃ | -20-40 | 100 | 150 | 200 | 220 |
| Non-shock Max(Working Pressure) | 2 | 1.65 | 1.5 | 1.4 | 1.35 |
Note 1: Pressure for intermediate temperatures may be determined by the interpolation method.
Note 2: Temperatures indicated are those of internal fluid.
Note 3: Piping loads, stresses, and moments are not taken into account.
3. Material Standard
Casting
| Nation | GB | JIS | KS | DIN | ASTM |
| Steel |
ZG07Cr19Ni9, ZG07Cr19Ni11Mo2 |
SCS13A,SCS14A | SCS13A,SCS14A | 1.4308,1.4408 |
CF8,CF8M |
| Standard | GB/T2100 | JIS G5121 | KS D4103 | DIN 17445 | ASTM A351 |
Pipe
| Nation | GB | JIS | KS | DIN | ASTM |
| Steel | 06Cr19Ni10, 022Cr19Ni10, 06Cr17Ni12Mo2, 022Cr17Ni12Mo2 | SUS304TP, SUS304LTP, SUS316TP,SUS316LTP | SUS304TP, SUS304LTP, SUS316TP, SUS316LTP |
1.4301,1.4307, 1.4401,1.4404 |
TP304,TP304L, TP316,TP316L |
| Standard | GB/T14976 | JISG3459 | DIN17456 | ASTM A312 |
4. Thread Standard
| Nation | GB | JIS | KS | DIN | BS | ASTM |
| Thread | R, Rc, Rp, G | PT, PF | PT, PF | R, Rp | BSPT,BSP | NPT, NPSC |
| Standard |
GB/T7306, GB/T7307 |
JIS B0203, JIS B0202 |
KS B0221, KS B0222 |
DIN2999 | BS21 | ANSI/ASME B1.20.1 |
5. Installation Precautions
a. Before installation, please confirm that the material, thread, and pressure of the product conform to the standard. Whether it is in conformity with the installation environment or regulations in order to avoid a safety accident.
b. Before installation, please check whether the product is clean, so as to prevent the foreign objects from falling into the pipe or attaching to thread.
c. If the sealant is used for sealing, please note that do not let it get into the pipe when installing.
d. Select the correct wrench when installing in order to prevent deformation or damage to the pipe fittings.
