Which gate valve is better?

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The following expert spindle checks require additional testing which may or may not be provided by the manufacturer:
 

Tip 6: Spindle material

• Confirm that the spindle material of the gate valve matches what is claimed by the manufacturer. This can be done using a spectrometer, which provides a break-down of a material&#;s chemical composition.
   
• Based on the chemical composition, you can then calculate or look up the pitting resistance equivalent number (PREN), a reliable indicator for through-wall corrosion resistance. As a general rule, if you are unsure about the corrosivity of the water and/or the soil around your valve, you should choose a spindle material with a PREN value of 25 or greater.

The spindles of Hawle E3 gate valves are cold-rolled, also on the shaft, thereby achieving extremely smooth surfaces. This preserves the wedge nut as well as the spindle sealing O-rings.

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Before selecting your valve, you will need to determine what it will be used for. Will it be used to regulate a fluid or stop its flow?

It is then necessary to verify the type of media that will circulate in the system: is it a gas or a liquid? Is the media corrosive, chemically neutral, a food product or a medical fluid that requires special hygiene conditions?

When it comes to the operation system of the valve it is important to know whether it is powered manually or automatically. In one case, someone must be on-site to operate the valve, while in the other case the valve can be operated remotely, from a control station for example.

Finally, it is important to know how the valve will be integrated into the system and the type of assembly or installation used, especially if it needs to be welded, bolted through flanges or screwed in.

Once you have determined these different elements, you can focus on the technical characteristics of your installation, in particular the flow and pressure that will allow you to determine the dimensions of your valve.

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