Cast steel flange ball valve

Ball valve and gate valve are the same type of valve, the difference is that its closing part is a ball, the ball is rotated around the body core line to achieve the opening and closing of a valve. Ball valves are mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. Flange ball valve standard GB/T21465-2008 "Valve terminology" is defined as: the opening and closing parts (spheres) are driven by the valve stem and rotate around the axis of the valve stem.

Flange ball valve

Nominal pressure PN1.0-32.0MPa, etc

Nominal diameter DN6 ~ 900, NPS 1/4 ~ 36

Connection method flange, butt welding, thread, socket welding, etc

Applicable temperature -196℃ ~ 540℃

Drive mode manual, worm gear transmission, etc

Working principle

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Opening procedure

1. In the closed position, the ball is pressed against the seat by the mechanical pressure of the valve stem.

2. When the handwheel is turned counterclockwise, the valve stem moves in reverse, and its bottom angular plane makes the ball free from the seat.

3. The valve stem continues to lift and interact with the guide pin in the spiral groove of the valve stem so that the ball begins to rotate without friction.

4. Until it reaches the full open position, the valve stem is raised to the limit position, and the ball is rotated to the full open position.

Closing procedure

1. When closing, turn the handwheel clockwise, the stem begins to drop and the ball starts to rotate away from the seat.

2. Continue to rotate the handwheel, the valve stem is subjected to the action of the guide pin embedded in its upper spiral groove, so that the valve stem and the ball rotate 90° at the same time.

3. When close, the ball has rotated 90° without contact with the seat.

4. In the last few turns of the hand wheel rotation, the angular plane at the bottom of the valve stem is mechanically wedged to compress the ball, so that it is tightly pressed against the seat to achieve complete seal.

Packing of Standard Packing:

 Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 2022 gallon liquid totes Special package is available on request. E FORUs’  is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.