Type made methods instructions
connecting type code
| connecting type | code | connecting type | code |
| internal thread | 1 | wafer | 7 |
| external thread | 2 | clamp | 8 |
| flange | 4 | ferrule | 9 |
| welding | 6 |
structural type code
| structural type | code | |||
| spring | sealing | with heat radiation disc | fall lift | 0 |
| low lift | 1 | |||
| fall lift | 2 | |||
| with wrench | fall lift | 4 | ||
| unsealing | double spring low lift | 3 | ||
| fall lift | 8 | |||
| low lift | 7 | |||
| with control device | fall lift | 6 | ||
| lever | single lever | |||
| fall lift | 2 | |||
| angle low lift | 5 | |||
| double lever | ||||
| fall lift | 4 | |||
| pilot type | 9 | |||
seat sealing surface material code
| seat sealing surface material | code | seat sealing surface material | code |
| copper alloy | T | Ammonia permeability steel | D |
| rubber | X | Boronizing Steel | P |
| nylon plastic | N | hard alloy | Y |
| Acid-resistant alloy steel or stainless steel | H | body processing | W |
| Tin-based bearing alloy (babbitt) | B |
nominal pressure code
PN code use Arabic numerals, its value is based on MPa as the unit of the nominal pressure value of 10 times. When annotating working temperature and working pressure, working pressure shall be marked with the P and P-word maximum temperature lower right corner of additional media figures, the figure is based on the maximum temperature of 10 in addition to medium derived from an integer value. Such as: an operating temperature is 540 ℃, working pressure is 10MPa, its code is P54100.
body material code
| body material | code | body material | code |
| grey cast iron | H | carbon steel | C |
| ductile cast iron | Q | Cr-Mo alloy steel | I |
| Cr-Ni-Ti steel | P | ||
| Cr-Mo-V steel | V |
