How to Troubleshoot Issues and Maintain Gate Valves

Gate valves are one of the most widely used types of valves in industrial settings. These valves are used by hospitals, waterworks facilities, chemical plants, gas and oil companies, and many others. Gate valves are so common because they're the best way to stop, start, and regulate the flow of liquids, including water, gas, and other media. 

Another reason that gate valves are so popular is because of their durability and longevity. However, gate valves will only have these qualities if you maintain them properly and know how to troubleshoot common issues. Otherwise, they have a significantly reduced lifespan and are prone to potential problems. 

If you're having issues with a gate valve and need troubleshooting assistance, you've come to the right place. This article will discuss how to solve common gate valve problems, as well as how to perform important maintenance items to ensure your gate valves last as long as possible.

While gate valves are highly durable and require little ongoing maintenance, there are a few issues they're prone to. 

The most common reason that a gate valve might fail to close is because sediment has built up inside the valve. Therefore, when you try to close it manually or automatically, the sediment blocks the valve from completely closing.

The best way to fix this issue is to try repeatedly opening and closing the valve to work the sediment loose. If this doesn't work, however, you'll need to turn off the water, drain the system, remove the valve and clean it.

If there are leaks around the valve stem or body, there are several potential reasons. It's possible that you installed the wrong size valve or that the valve has a production defect. It's also possible that the valve has sustained damage due to wear and tear or another issue. 

The first thing you should do when there's a leak around the valve stem or body is tighten the packing nut. If that doesn't work, you may need to replace one of the valve components, such as the washer or packing material, or the entire valve.

Corrosion and rust buildup are perhaps the most common issues with gate valves. This is because of the moist and corrosive nature of their surroundings. It's also because gate valves are typically made of bronze, cast iron, steel, and similar products. 

The best way to guard against rust is to apply an anti-corrosion coating to your valves prior to installation. If the valve is already rusty, you'll need to wash it in baking soda and vinegar or apply a rust-busting spray. In some cases, however, replacing your valve is the only option. 

The final most common gate valve issue is that the valve gets stuck and doesn't seal properly when you open or close it. The best way to take care of sticking is to turn off the water, drain the system, and apply oil to the valve. If the valve is still stuck, use a blow torch to warm the valve and a wrench to forcefully open and close it. 

Whether you're having one of the issues above or another problem, here's a step-by-step guide for how to troubleshoot gate valve problems.

1. The first thing you need to do is identify the problem, whether it's a leak, rust, improper closing, or something else.
2. Next, look for the most common causes of these problems, such as sediment in the valve stem, wear and tear, worn seals, corrosion, and more.
3. You should also check for signs of physical damage or misalignment of the valve and its components.
4. Once you identify the problem as well as the probable root cause, you can take action and make your repair.

Most of the issues that hamper gate valves are fairly minor and you can get by with a quick fix. Here are some of the most common: 

1. For leaks and sticky valves, start by flushing the valve to clear up debris.
2. For leaks around the valve stem, try tightening the packing nut.
3. If there is corrosion on your valve, clean the valve and its components.
4. If the valve is stuck, apply lubricant to loosen the valve up.
5. Check the valve and what it's attached to to ensure it's the right size.

If it's more cost-effective to replace the valve or its components than to fix them, you should replace them. Additionally, if your gate valve is 20 to 25 years old, you should replace it, as this is the average lifespan of most gate valves. 

Although most gate valve problems are fairly easy to troubleshoot and fix, it's much easier if you prevent them in the first place. The best way to do this is with proper maintenance, including: 

1. Regularly lubricate the stem
2. Adjust the packing gland and material as needed
3. Rotate the valve on a monthly or bi-monthly basis
4. Perform a regular inspection of the gate valve for rust, leaks, and damage

In some cases, you may need to replace certain parts of the valve if a fix isn't possible. The most common components that require replacement include: 

1. Valve seat
2. Seals
3. Washers
4. Packing gland
5. Valve handle

You can replace most of these components using a screwdriver and wrench. Simply take the valve apart, replace the damaged component, and put the valve together again exactly as you took it apart. If the valve is extra stuck, you may need a hammer or heating torch to loosen it enough to take it apart. Be sure to wear gloves and safety glasses anytime you're performing valve maintenance or repairs.

While all gate valves will need repairs, maintenance, and eventual replacement, it definitely pays off to invest in high quality valves. High quality valves require fewer repairs and less maintenance, and last longer than low-quality valves. 

In addition to saving time and money on repairs, maintenance, and replacement, high quality gate valves also save money in other ways. They're more efficient and will suffer less downtime due to repairs and maintenance.