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Slide Valves

Slide valves can be designed in cold or hot wall configuration. The body for hot wall valves [see chart] has an abrasion resistant lining on hex-mesh. Cold wall valves [see chart] have their carbon steel body lined with refractory material and are capable of operating at temperatures up 950 °C.

Slide valves are named according to their position in the plant:

• Spent
• Recirculation
• Regenerated
• Cooled
• Flue Gas Double Disc

They all have just one disc, except for the Flue Gas type which has two. Single disc valves are used for dense fluids while double disc ones are used for gaseous media.

Regenerated and spent catalyst slide valves are designed to control the catalyst flow to the reactor. In an emergency these types of valves must be able to stop the catalyst flow.

The Flue Gas Double Disc Slide Valve regulates the flue gas flow to the CO boiler and the operating pressure of the regenerator.

Regardless of the type of slide valve, the disc is built as a single piece lined on its entire top and front surfaces and for over 50% of its bottom surface with abrasion resistant material. The sides and the bottom part of the disc in contact with the guides are hard-faced with cobalt-base material and then ground [photo, bottom left].

The orifice plate surfaces facing the disc and those exposed to the flow are also lined with abrasion resistant material cast on hexagonal mesh [photo, right] and then ground.

REMOSA has developed a special procedure for anchoring the abrasion resistant lining to the edges by installing corner tabs, separated from the hexagonal mesh by using binding bars.

Stems are made of SA 182 Tp 304H material for cold wall valves and SA 182 F11 material for hot wall spent catalyst slide valves.

Copyright © REMOSA spa 1998-2008 Last updated on Jan 2, 2008