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Carbon Steel Globe Valves

  • Dec 10, 2022
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Carbon steel globe valves are mainly used to cut off, distribute and change the flow direction of media in pipelines.

Applications
Carbon steel globe valves are widely used in water treatment equipment, chemical equipment, petrochemical equipment, petroleum equipment, papermaking equipment, mining equipment, power equipment, liquefied gas equipment, food equipment, pharmaceutical equipment, water supply and drainage equipment, mechanical equipment valves, electronic industry valves, urban construction valves, industrial pipeline valves, general parts, industrial equipment, fire HVAC, filtration equipment, environmental protection equipment and other fields.
 
Carbon steel globe valves have the following advantages:
1. The fluid resistance is small, and its resistance coefficient is equal to that of a pipe section of the same length.
2. They have simple structure, small sizes and light weights.
3. They have good sealing and are reliable. At present, plastic is adopted for the sealing surface of the globe valve, which has good sealing performance and has been widely used in vacuum systems.
4. Carbon steel globe valves are easy to operate, with fast opening and closing, and they only need to rotate at an angle of 90 from being fully open to fully closed, which is convenient for remote control.
5. When a carbon steel globe valve is fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and when the medium passes through, it will not cause erosion of the valve sealing surface.
6. Carbon steel pipes have a wide range of applications, with diameters as small as a few millimeters and as large as several meters, and can be applied from high vacuum to high pressure.
 
Matters needing attention for installation and maintenance of carbon steel globe valves:
  • Leave a position for the valve handle to rotate.
  • Cannot be used as throttling.
 
Working principles of carbon steel globe valves
The opening process
1. In the closed position, the valve body is pressed against the valve seat by the mechanical pressure of the valve stem.
2. When the hand wheel is turned counterclockwise, the valve stem moves in the opposite direction, and the angular plane at the bottom of the valve makes the ball removed from the valve seat.
3. The stem continues to lift and interacts with the guide pin in the helical groove of the stem, causing the ball to begin rotating without friction.
4. The valve stem is lifted to the limit position until it reaches the fully open position, and the ball rotates to the fully open position.
 
The closing processes
1. When the carbon steel valve is closed, turn the handwheel clockwise; the valve stem starts to drop, and the ball leaves the valve seat to start rotating.
2. Continue to rotate the handwheel, and the valve stem is acted by the guide pin embedded in the spiral groove on it, so that the valve stem and the valve plate rotate at an angle of 90 at the same time.
3. When the valve is about to close, the valve body has rotated 90° without contacting the valve seat.
4. In the last few turns of the handwheel, the angular plane at the bottom of the stem mechanically wedges against the ball, pressing it tightly against the valve seat to achieve a complete seal.