in steam systems simply because they are full port. It isn't always possible or practical to drip before an isolation valve. A globe valve in a horizontal steam line will present a "dam" and back up condensate, and cause hammer. Large ball valves have there own problems, you think Gates get stuck! Perhaps the question of installation with stem up, horizontal or down should be asked. Stem up and all the c**p in the pipe lodges in the lower channel. Stem horizontal and the side channel is full. Down and the blade has a clean seating area? Any thoughts?
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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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