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Gate Valves:
Following packing materials are optional depending on the conditions.
Packing Materials |
Service conditions |
Flexible Grahite |
Die-formed Rings |
600C(1110F) Corrosion resistant |
Braided Graphite Yarn |
PTFE cup & cone/PTFE V-ring |
150C (300F) Corrosion resistant |
Carbon fiber |
500C (930 F) High pressure |
Inconel wired flexible graphite |
600 C (1110F) Corrosion resistant |
Braided PTFE fiber |
260 C (500F) Corrosion resistant |
Inspection and test:
Every piece of Sakhi cast steel
valves is subjected to 100% pressure tests according to API 598 or BS
6755 part 1 requirement. Manufacturer's material test report and
inspection certificates are available on your request.
Sakhi can do the following test and inspection according to the requirement of order.
| Test/ Inspection Item |
Method |
Evaluation |
| Chemical composition analysis |
|
Relevant ASTM Stds. |
| Mechanical property test |
ASTM A370 |
Relevant ASTM Stds. |
| Pressure test |
API 598 or BS EN12266 |
API 598 |
| Radiographic inspection |
ASTM E142/E49 |
ASME B 16.34 |
| Wet magnetic partice inspection |
ASTM E138 |
| Liquid penetration inspection |
ASTM E165 |
| Low temperature impact test |
ASM E23 |
ASTM A352 |
| Dimensional inspection |
|
Relevant valve Stds. |
| Visual inspection |
|
MSS SP-55 |
| Emission test |
EPA Method 21 and Sheel specification |
|
| PMI |
Manufacturer Std |
Shell specification |
Low Emission Service Valves
Sakhi
offers low emission service valves. The valves comply with
environmental protection requirements. Our developed low emission
valves are designed, manufactured and tested to meet less than 100ppm.
Live-loading.
Two sets of plate springs maintain a permanent packing stress of
3500-4000psi. Live-loading extends low emission service life especially
in services with large pressure/temperature transients or frequent cycling.
Leak-off. For critical
service a lantern ring and double packing can be provided with a
leak-off connection. The leak-off is provided to allow collection of
leakage from the lower packing set.
Stem 16-32 RMS surface finish, straightness and roundness are precisely controlled.
Stuffing box-Maximum 63 RMS surface finish. Cylindricity and
verticality are precisely controlled
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