Globe Valves for Steam Aplications

[Sallyj2707]

Hey everyone, just wanted to share an article I read recently surrounding globe valves for Steam Applications.

The article discusses all of the unseen advantages that globe valves have to offer which include regulating flow. Globe valves are designed to stop, start, and regulate the flow of a specific medium in linear motion. This is why they are preferred when comparing with gate valves who have an all or nothing approach.

Hope this helps to anyone studying!

 

[waross]

Anecdote alert:
In an instsllation where condensate lines were run overhead a bank of gate valves were installed with the handles down.
Pipe scale blocked the grooves.
Valves became inoperative in one day.
Replaced with globe valves.

--------------------
Ohm's law
Not just a good idea;
It's the LAW!

 

[Andrew B]

Good Article, one thing to understand that using a a gate valve and even a ball as a comparable is that valves do 1 of 2 things they isolate or they control but never both. So the article is right when it comes globes they should be used to control but the gate valve should never be used to control flow and definitely never with steam for these reasons;

1. Flow Control: Gate valves are designed for fully open or fully closed positions and are not ideal for throttling applications. When used to control steam flow, they can lead to unstable flow conditions and increased turbulence.
2. Temperature and Pressure: Steam systems operate under high temperatures and pressures. Gate valves may not provide a tight seal when partially opened, leading to leaks that can pose safety hazards.
3. Wear and Tear: Continuous operation in a throttling position can cause excessive wear on the gate and seat, leading to premature failure of the valve.
4. Response Time: Gate valves have a longer response time when opening or closing compared to other valve types, making them unsuitable for applications where quick adjustments are necessary.
5. Risk of Water Hammer: If a gate valve is used to throttle steam flow, it can contribute to water hammer, a phenomenon that can cause severe damage in steam systems.

Its always important to understand process conditions before choosing a valve

1. how often will valve be cycled
2. What is the temp
3. What is the pressure
4. When sizing for control and min norm max of pressure
5. Material selection is important extreme temp i.e. F91 F22 forged.

Always stick with a control valve and avoid a valve for isolation.