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Forged Steel Gate Valve Application and Troubleshooting

March 11, 2023

Applications of forged steel gate valves 

Forged steel gate valves are used in different industries for various applications, such as:

  • Chemical processing.
  • Municipal water supply.
  • Steam power plants.
  • Crude oil and natural liquid gas transportation.
  • Ships for the steam circuit.

Advantages of forged steel gate valves 

  • These valves are bi-directional. This feature allows fluid to flow through the valve in both directions without causing malfunctions.
  • Forged steel gate valves have low-pressure drops when fully opened.
  • These valves are easy to install, clean, and repair. Removing the bonnet (top cover) makes it easy to access the internal parts of the valve for effective cleaning and restoration.
  • These valves have a few moving parts, which makes repair and maintenance cheaper.
  • They are versatile in use. This is because they can be used in different applications ranging from hot to cold fluids.
  • These valves are available in various sizes for high pressure and flow rates.
  • They are highly reliable.

Disadvantages of forged steel gate valves 

  • They are not reliable for throttling fluid flow.
  • These valves occupy ample installation space.
  • They are slow in operation.

Troubleshooting forged steel gate valves 

The valve is hard to operate 

  • Foreign materials stuck between gland flange and stem. Disassemble the valve according to the forged steel gate valve manufacturer’s guidelines and remove foreign materials.
  • Gland bolt over torqued. Loosen the gland bolt.
  • Misaligned gland flange. Re-align the gland flange perfectly.

Fluid leakage between the body and the pipe 

  • Loose bolts. Tighten the valve-pipe flange bolts.
  • Worn out gasket. Replace the gasket.
  • Excess fluid pressure. Use a higher-rated valve or reduce pipe pressure to the level the forged steel gate valve manufacturer recommends.

Leakage between body and bonnet 

  • Loose bolts. Tighten the bolts.
  • Damaged or worn-out gasket. Replace the gasket.

Leakage through the valve stem 

  • Damaged or worn-out packing. Replace the packing.
  • Damaged stem. Replace the stem.

The valve does not close or open completely 

  • Foreign materials stuck in the valve. Open the valve and remove all foreign materials.
  • Worn out or damaged valve seats. Replace the seats.

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