11132018Tue
Last updateMon, 12 Nov 2018 5pm

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Preventive Maintenance and Repair for Sleeved Plug Valves

Preventive maintenance and repair for valves is an important part of keeping operations running smoothly and efficiently. For the sleeved plug valve (SPV), such maintenance is minimal—simply requiring an occasional adjustment to prevent both external and internal leakage in certain applications. The repair process for SPVs can be more extensive—inspection of parts and use of proper replacement parts are vital for ensuring a safe, successful overhaul. Additionally, root cause failure diagnosis is a critical part of this process. This is because the damage detected is the best indicator of the type of change to the valve or modification to the process that, if made, will extend the useful life of the valve.

 


Valve Repair Companies

It’s unwise to pay too much, but it’s worse to pay too little. When you pay too much you lose a little money, that’s all. When you pay too little, you sometimes lose everything, because the thing you bought was incapable of doing the thing it was bought to do. —John Ruskin

That famous quote from social thinker John Ruskin was sent in to Valve Magazine from Urmimala Mukhopadhyay, marketing analyst for Cameron Valves & Measurement. It summarizes very well what many Valve Repair Council (VRC) members feel is the main danger of not using an OEM-certified company in making valve repairs.

 

Just Read the Instructions

Although the situation might change eventually, it’s a reality that most people working in the valve repair industry today are men. It is also a reality that many men hate to read instructions or rely on a map. However, when repairing critical pressure-containing equipment such as valves, a little glance at the words now and then can be important. And when it comes to valve repair instructions and standards, sometimes it takes a little digging to find the right paragraphs of wisdom.

 

A Guide to Valve Cleaning and Specifications

Most of the time we only require that valves be free of basic dirt and debris before they are put in service. However, occasionally service requirements dictate that all traces of oil, dust and grease be removed. A prime example is valves to be used with oxygen. In that case, even a small speck of oil in a 100% oxygen environment can create a devastating explosion. One tiny metallic sliver could cause a minute spark, which is all that would be required to trigger the destruction.

 

The Nuts and Bolts of Nuts and Bolts

Repairing a valve usually means ­discarding old fasteners and replacing them with new ones. But it takes more than just matching thread diameter and pitch to make the correct fastener selection.

First let’s discuss why a bolting change would be necessary. Nuts and bolts serve two purposes: they hold components in alignment or they provide clamping force. In some cases, they do both. In the case of valve body/bonnet joints, the fastener’s function is to clamp the two pressure-containing valve halves tightly together with a gasket between them to prevent fluid leakage. When a bolt is tightened, it is stretched a small amount. If it was not stretched, there would be no clamping force.

 

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