Which media are suitable for spring-type safety valves respectively?

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This post was last edited by Catalyzing a Grain on 2018-12-29 at 10:53. Spring-type safety valves are classified into full-opening safety valves and slightly-opening safety valves based on their structural design. Generally, the A41 type of slightly-opening safety valve is used for liquid media such as oil and water, while the A42 type is used for gaseous media such as air and natural gas. The A48 type of full-opening safety valve is more commonly used with steam media. But this is a commonly used selection method; ultimately, it depends on the user’s requirements regarding capacity and temperature. For valves of the same diameter, those with full-opening operation will certainly have a greater capacity than those with partial-opening operation, as full-opening valves allow for complete discharge. Additionally, closed-type safety valves help prevent dust and debris from entering and stop toxic and flammable substances from leaking out, while open-type safety valves aid in reducing the temperature of the spring chamber; hence they are suitable for steam-based media. The opening height of a fully open safety valve is ≥ 1/4 of the flow channel diameter, resulting in a high discharge capacity. The opening height of the slightly-opening safety valve is 1/20 to 1/40 of the flow channel diameter, resulting in a low discharge volume.