Types and Parts

Parts of the Safety Valve

    Boiler-Safety-valve  

Types of Safety Valves:

1. Ordinary Lift Safety Valve: This is the simplest and most common type of safety valve. It operates by lifting a disc from the valve seat when the steam pressure exceeds the set pressure. The lift is typically around 1/24th of the valve diameter, and the discharge capacity is proportional to the lift area.

 

2. High-Lift Safety Valve: This type of valve has a longer travel distance between the valve seat and the disc, resulting in a higher lift than the ordinary lift valve. This allows for a higher discharge capacity and reduces the risk of steam choking. High-lift safety valves are commonly used in applications where the boiler pressure is high.

 

3. Improved High-Lift Safety Valve: This is an advanced version of the high-lift safety valve. It has a longer travel distance and a larger lift area, resulting in a significantly higher discharge capacity than the high lift valve. This type of valve is used in high-pressure and high-capacity boilers.

 

4. Full Lift Safety Valve: This valve has a full lift area, which means that the valve disc is lifted completely off the seat when the set pressure is reached. This results in the highest possible discharge capacity, making it suitable for high-capacity boilers.

 

5. Full Bore Safety Valve: This type of valve has a larger valve seat and disc than other safety valves. This reduces the risk of steam choking and provides a higher discharge capacity. It is commonly used in high-pressure and high-capacity boilers.

 

6. Pilot-Operated Safety Valve: This type of valve uses a pilot valve to control the opening and closing of the main valve. The pilot valve is sensitive to changes in pressure and can adjust the main valve’s opening accordingly. Pilot-operated safety valves are used in high-pressure and high-capacity boilers.

 

7. Electro-Magnetic Safety Valve: This valve is controlled by an electromagnet, which opens and closes the valve disc. It is commonly used in applications where rapid opening and closing are required, such as in power plants and other industrial settings.

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