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What is the technical standard of all welded ball valve?

Release date: [2020-06-05] click through rate:

All welded ball valves are widely used in various fields. Its superior quality and high performance stability can not be achieved by ordinary cast steel ball valve, and its service life is far longer than that of cast steel ball valve. All welded ball valve is widely used in city gas, city heating, petrochemical, shipbuilding, steel, pressure regulating station, power plant and other pipeline equipment.

All welded ball valve Working conditions

1. In operation, the flow resistance of the valve is small, the tightness is stable, and the vibration is small when opening and closing.

2. The ball valve is specially designed for district heating system.

3. Integral welding, no external leakage.

Performance requirements of all welded ball valves

1. Pressure: 1.6Mpa

2. Temperature resistance: - 29 ℃ - 200 ℃

3. Leakage level: Grade A III. design

 All welded ball valve

Design of all welded ball valve

1. The design of the valve meets the requirements of ASME / ansib 16.34, GB / t12237-2007, api6d-2008, en 19, en 488, en10204.3.1. B.

2. Valve body: double seal, all welded structure.

3. Sphere: the sphere is hollow.

4. Valve rod: the valve rod shall be designed to prevent the valve stem from falling out when the valve stem sealing ring (such as packing gland) is disassembled under the action of medium pressure. The cross section of the valve stem and the connection surface with the ball shall be able to withstand the maximum operating torque.

5. Requirements: full bore ball valve

All welded ball valve material

1. Valve body: double sealing structure, ා 20 steel or equivalent material, with body weight and thickness indicated

2. Sphere: AISI304 or equivalent, hollow ball with wall thickness indicated

3. Seal: alloy steel hard seal, and mark the brand

4. Stem: AISI304 or equivalent

5. Spring: alloy steel, AISI304 or equivalent

6. O-ring: fluororubber

7. The leakage grade is a

8. Dry bearing: Steel Teflon spcb + PTFE or equivalent.

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