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Fully Welded Ball Valves

China fully welded ball valve manufacturers, Suppliers, Factory, Price

Short Description

China Fully Welded Ball Valves, Advanced Design For Safety and Reliability; Pipeline Transportation, Meeting API 6D


Fully Welded Ball Valves Specification
• DDB or DIB Function for option
• Welding Slop with 100% X-Ray Examination
• Full Port, API 6D, API 607 Firesafe
• Injection Port for seat & stem, Drain and Vent Ports
• Stem extension for underground installation on request
• Self relieving seat
• Fire safe design,Anti-static device,Blow-out proof stem

Fully Welded Ball Valves Body Design
The fully welded body design shall carry out the the finit element stress analysis. China fully welded ball valve finit element stress analysis

Fully Welded Ball Valves Seat Design
The seat can be designed to DBB, DIB-1, DIB-2 to better satisfy the working condition.
China fully welded ball valve seat design drawing

Fully Welded Ball Valves Ball Design
When the ball is subject to medium force, the ball passed the force to the trunnion plate(rather than the stem), thus ensure the safety and easy operation for the stem.

China fully welded ball valves ball design drawing

Fully Welded Ball Valves Drawing
fully welded ball valves stem seal drawing from China fully welded ball valve manufacturer, supplier

Fully Welded Ball Valves Main Parts

Part No. Part Name Part No. Part Name
1 Body 15 Seal Gland
2 Anti-fire Packing 16 Thrust Bearing
3 Seat 17 Stem
4 Seat Ring 18 Flat Key
5 O-ring 19 Thrust Bearing
6 Spring 20 Anti-fire Gasket
7 Bonnet 21 Connection Plate
8 Sealant Injection Valve 22 Socket Head Screw
9 Check Valve 23 Packing
10 Ball 24 Packing Gland
11 Thrust Gasket 25 Anti-static Device
12 Sliding Bearing 26 Air Release Valve
13 Pin 27 Drain Valve
14 Bearing Holder    

Corrosion Resistance and Sulfide Stress Resistance
Certain corrosion allowance is left for the body wall thickness. The carbon steel stem, fixed shaft, ball, seat and seat ring are subject to chemical nickel plating according to ASME B733 and B656. The valve material are to meet Nace MR 0175/ISO 15156 or Nace MR 0103 according to customer request, fully meet the reuqirements in standards and meet the service conditions in sulfurization evioronment.

Non Destructive Examination
The forging materials are subject to ultrasonic examination according to ASME non destructive flaw detection requirements. The welding slope in connection connection face is subject to liquid penertration examination, or X-ray examinatiion.

Overview of Fully Welded Ball Valves
Fully welded ball valve are used mainly in Gas Transmission and Distribution pipeline (Mid-stream), typical for underground and buried installation. Fully welded ball valves normally adopt forged steel body; however, cast steel body is also available. There are normally extended stem for fully welded ball valves used for underground. The main advantage of fully welded Ball Valves is that there is no leaking path through the joints. 



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