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Design Features:
1 Double block and bleed design (DBB)
2 Double stem sealing. The ball can maintain pressure sealing of pipeline when it is closed or fully opened.
3 Shorter upper sleeve reduces bearing load and operating torque.
4 Limit device ensures the accurate opening and closing position of the valve.
5 The ball and stem are separated so as to reduce stem load. The stem adopts anti-blow-out design.
6 The sealing surface is inserted into the metal seat by polymer or plastic.
7 The metal backed self-lubricating PTFE bearing and PTFE thrust washers reduce the opening torque and prolong the service life of the valve.
8 Stem leakage can be prevented through the emergency grease fitting.
9 Nickel and phosphor treatment to the parts can enhance the anticorrosive performance.
10 The fireproof design of metal wound gasket composed of stainless steel and graphite can prevent external leakage.
11 Anti-static design.
Structural Features:
1 Class 150LB, 300LB all adopt two-piece trunnion mounted casting structure.
2 Class 600LB below 12" ( including 12" ), class 900LB, 1500LB, 2500LB
Below 4" ( including 4") adopt three-piece trunnion mounted forging structure.
3 Class 600LB above 14" ( including 14" ), class 900LB, 1500LB, 2500LB
Above 6" ( including 6") adopt three-piece supporting board type forging structure.
Design and manufacturing: ASME 16.34 / API6D & BS53551
Pressure temperature ratings: ASME 16.34
Top flange: ISO 5211
Minimum wall thickness of valve: ASME 16.34
Valve body and trim are in accordance with: NACE MRO 1-75
Valve bore: API 6D
Face to face: ASME 16.10 / API 6D
Flange connection dimension: ASME 16.5 / ASME 16.47
Butt welding end dimension: ASME 16.25
Pressure test: API 6D / API 598
Fireproof test: API 607 / API 6FA
Vent / drain / bypass: API 6D / MSS SP 45
Corrosion protection and painting of valve:
I. The unmachined surfaces of all castings are subjected to metal shot blasting
Treatment. The surface and interior of parts are thoroughly cleaned before assembly.
Ultrasonic cleaning is carried out before the valve surface is painted. Epoxy zinc phosphate primer is carried out, followed by drying and polishing. Final epoxy coat
Is applied according to customer requirements on color.
II. The valve after being painted will be packed by plastic bags with desiccant to prevent
Corrosion of machining surfaces. External packing is made according to customer requirement.
Trunnion Mounted Ball Valve (B6-600)
