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9 common misunderstandings in gate valve installation

2023-10-27

10 common gate valve installation misunderstandings that are easily overlooked:

1. The bolt is too long.

It is sufficient for the bolts on the gate valve to have only one or two threads extending past the nut. The risk of damage or corrosion can be reduced. Why buy a bolt that's longer than you need? Often, bolts are too long because someone didn't have the time to calculate the correct length, or the person simply didn't care what the end result looked like. This is lazy engineering.

2. The gate valve does not need to be isolated separately.

Although isolation gate valves take up valuable space, it is important to allow personnel to work on the valve when maintenance is required. If space is limited, if the gate valve is considered too long, at least install a butterfly valve, which hardly takes up any space. Always remember that for those who have to stand on them for maintenance and operations, it is easier to work with them and carry out maintenance tasks more efficiently.

3. No pressure gauge or device is installed.

Some utilities like to calibrate testers, and these facilities usually do a good job of providing their field personnel with connections to test equipment, but some even have interfaces for mounting accessories. Although not specified, it is designed so that the actual pressure on the valve can be seen. Even with supervisory control and data acquisition (SCADA) and telemetry capabilities, someone at some point will be standing next to the valve and need to see what the pressure is, and that's so convenient.

4. The installation space of the gate valve is too small.

If installing a gate valve station is a hassle and may involve digging concrete, don't try to save that little cost by making it as small as possible in the installation space. It will be very difficult to perform basic maintenance later.

Something else to keep in mind: the tool can be quite long, so space must be set aside so that the bolt can be loosened. It also requires some space, which allows you to add devices later.

5. No consideration for later disassembly.

Most of the time, installers understand that you can't connect everything together in a concrete chamber without some type of connection to allow for removal of the parts at some point in the future. If all the parts are tightened tightly with no gaps, it will be nearly impossible to separate them. Whether it is groove coupling, flange joint or pipe joint, they are all necessary. In the future, there may be times when components need to be removed, and while this is not usually a concern for the installing contractor, it should be a concern for the owner and engineer.

6. Concentric reducers are installed horizontally.

This may be nitpicking, but it's worth paying attention to. Eccentric reducers can be installed horizontally. Concentric reducers are installed in vertical lines. In some applications where horizontal installation is required, an eccentric reducer is used, but the issue usually involves cost: concentric reducers are cheap.

7. Valve wells that do not allow drainage.

All rooms are wet. Even during valve activation, when the air is expelled from the valve cover, water will fall to the floor at some point. Anyone in industry at any time has seen a flooded valve, but there's really no excuse (unless, of course, the entire area is flooded, in which case you have bigger problems). If a drain pipe cannot be installed, a simple drain pump is used, assuming power is available. In the absence of power, a float valve with an injector will effectively keep the chamber dry.

8.Do not exclude air.

When the pressure drops, air is expelled from the suspension and is diverted into the pipes, which causes problems downstream of the valve. A simple bleed valve will get rid of any air that may be present and will prevent problems downstream. A bleed valve upstream of the control valve is also effective since air in the pilot line may cause instability. Why isn't the air removed before it reaches the valve?

9. Spare tap.

This may be a minor issue, but it always helps to have spare taps in the chamber upstream and downstream of the control valve. This setup provides for ease of future maintenance, whether connecting hoses, adding remote sensing to a control valve or adding a pressure transmitter for SCADA. For the small cost of adding accessories during the design phase, it significantly increases usability in the future. Making maintenance tasks more difficult since everything is covered in paint, it is impossible to read the nameplate or make adjustments.

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