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Guide To Maintenance and Troubleshooting of Globe Valves

The metal globe valve is used for controlling the flow rate or throttling the flow of air, steam, liquid, etc., through a pipe.

Imagine your globe valves as the skilled gatekeepers of fluid dynamics within your industrial operations. To keep these crucial components in top shape, it is vital to stay on top of their maintenance and troubleshooting. Issues can arise, from wear to unexpected mechanical problems, which could impact your system efficiency. As we delve into globe valve maintenance, you will discover critical methods to overcome challenges and ensure your valve's peak performance.

Globe Valve Functionality and Common Issues

Within diverse systems, globe valves are pivotal in controlling fluid pace. Their design features a disc that moves to adjust fluid passage. However, these valves can face problems like:

  • Wear from the disc’s continuous motion against the seat, leading to leaks and potential system damage.
  • Corrosion that jeopardises valve parts and causing device failures.
  • Physical damage from mishandling or external impacts that can impair functionality.

To dodge these troubles, globe valve suppliers recommend proper installation and regular maintenance. Routine checks can reveal early corrosion or wear, prompting necessary actions like repacking glands or replacing worn components. Sometimes, a complete valve replacement may be the best route.

By embracing vigilant installation and upkeep, you help ensure that your globe valves regulate flow with reliability and precision.

Standard Testing Procedures for Globe Valves

Maintaining globe valve integrity means adhering to essential testing routines. These checks verify that valves function safely within their intended environments. The tests you will want to conduct include:

  • Shell Tests- To evaluate the valve body’s robustness, allowing no leaks.
  • Backseat Tests- To ensure no leakage from the stem or shaft to the seal, which is crucial for packing replacement while in service.
  • Closure Tests- To assess the valve’s sealing ability, allowing limited leakage under low and high pressures.

API standard 598 outlines the conditions and fluids for these tests, setting the acceptable leakage rates. Following these guidelines is essential for your globe valve’s safety and effectiveness.

Identifying and Addressing Globe Valve Failures

Globe valves are crucial to your systems, so knowing how to fix their common issues is critical for their dependability.

Common Globe Valve Failures and Solutions

  • Corrosion and Leakage

Corrosion can eat away at a valve’s disc, often due to the wrong materials or corrosive agents. To combat this, select valve materials suited to your system’s fluids. Check the assembly for looseness or flaws if you spot leaks at the seat or body. Disassemble the valve to investigate, and replace the seat if needed.

  • Stem Issues

Stems may bend or snap from too much force or use. Keep valves within their limits and swap out damaged stems.

  • Seat and Disc Cracks

Temperature shifts can crack seats and discs. To prevent this, heat treat parts and fix surfaces as required. For leaks at the cover, tighten bolts evenly and change out any worn gaskets.

  • Sticking and Binding

Valves that stick might be clogged with debris. Clean parts and check for seat or disc damage.

  • Nil or Insufficient Flow

Make sure the valve is correctly positioned and free of blockages. If problems persist, inspect the pipeline for more clogs.

  • Excessive Noise and Actuator Problems

Noise may signal cavitation or water hammer. Adjust the flow or add a pressure-reducing valve. Inspect the control system and any electrical or pneumatic faults for actuator issues.

Taking these steps not only solves immediate issues but also aids in your valve system's overall health. With a proactive stance on troubleshooting, you can keep your globe valves running smoothly, avoiding process disruptions.

Routine Maintenance and Inspection Best Practices

A proactive stance is crucial for maintaining your globe valves. Here is a checklist to ensure your valves work flawlessly:

  • Regular Maintenance Tasks- Lubricate as advised, and check the packing gland and materials for wear, tightening as needed.
  • Inspection Process for External and Internal Parts- Conduct stem and bonnet checks and internal inspections post disassembly, replacing any stiff gland packing to maintain pressure integrity.
  • Importance of Regular Inspection Timetable- Inspect based on valve usage, fluid type, and pressure. Operate the valve during checks and take apart after depressurising for internal examinations.

Correct assembly and thorough installation checks are also vital for your globe valve performance and lifespan.

Step-by-Step Globe Valve Assembly and Installation

Proper assembly and installation are key to your globe valve’s success. To avoid common mistakes leading to early wear or failure, follow these steps

  • Start with the disc and stem connection, ensuring smooth disc movement.
  • Place the stem and disc into the body with the correct alignment.
  • Fit the seat snugly into the body with the right orientation.
  • Attach the bonnet without cross-threading to prevent leaks.
  • Add the wheel handle or actuator, ensuring it turns freely and the stem responds correctly.

With your globe valve assembled and in place, focus on routine maintenance and checks for continued high performance and to head off potential issues.

Guidelines for Globe Valve Seat and Handle Replacement

If your globe valve is not blocking flow properly or you are having control issues, consider replacing the seat or handle. Here is how to handle these replacements effectively.

Replacing the Valve Seat

Recognise the right time to replace a valve seat by looking for damage signs like cracks or sealing issues. If present, swap it out. Select the correct materials for the new seat, guided by the Valve Seat Material Selection Guide. This guide matches seat material to your operation’s specific needs, considering temperature, pressure, and fluid type.

To replace the valve seat, follow these steps:

1. Disassemble the valve, removing the old seat.
2. Clean the area to avoid debris with the new seat.
3. Grease the new seat for easier installation.
4. Secure the new seat, aligning it with the valve disc.
5. Put the valve back together, ensuring tightness.

Replacing the Handle

Handles are crucial for manual valve operation. If worn or broken:

1. Empty the fluid valve and close it.
2. Undo the bolts or screws, remove the old handle.
3. Align the new handle with the stem.
4. Fasten the new handle, checking for tightness.
5. Test the handle’s operation for smoothness.

Following these steps should keep your globe valves ready to manage fluid flow.

Also Read: Evaluating the Differences Between Globe Valves and Butterfly Valves

Lubrication and Care for Long-Term Globe Valve Performance

Regular lubrication is the secret to your globe valve’s longevity and peak function. Proper lube reduces part friction, lessens wear, and lengthens valve life. Use manufacturer-recommended products, applying them with a spray or directly with a cloth or brush as needed. Lubricate every six months or as per the manufacturer's advice, keeping even seldom-used valves ready for action.

Ensuring Globe Valve Reliability Through Expert Maintenance

To guarantee smooth and dependable industrial operations, it's essential to have a comprehensive understanding of the maintenance requirements for globe valves. Detecting early signs of wear and taking swift action can help you maintain strong and resilient valve systems. Staying committed to these practices is crucial to safeguard the efficiency and lifespan of your industrial assets.

Remember to collaborate with your industrial valve supplier in Russia for further insights and expert assistance regarding valve maintenance and repair.

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