High temperature solenoid valve +200C

[asimpson]

I am looking for small direct acting soienoid valves for steam at low pressures. Orifice size 2mm to 5 mm.

I have used below valves with PTFE with some sucess.

http://www.betavalve.com/cms/cms.js...6BB25&category=22&description=&page=#E306BB25

Problem is valve may be subject to higher temperatures than 170C for short periods (1-3 sec) that may be detrimental to valve.

Function is to evacuate to athmosphere steam from a chamber that could be running at 600C . At the end of evacuation super heated gas and steam measured around 300C for short periods.

Without adding countermeasures to protect valve does anybody know of a relatively inexpensive valve that can take these temperatures.

Needs to be relatively fast ( less the 0.5 sec). Pressure (0-10 bar) normally (0-3 bar).

Normally open to evacuate.

Many thanks

 

[moltenmetal]

You're probably asking too much of the elastomers that such valves require to function properly. Although Kalrez and similar high tech perfluoroelastomers exist, and can handle DRY gas to 300 C, their Achilles' heel is steam.

The valve construction for your conditions is no problem- the trouble is the solenoid actuation, which exerts so little force that it needs elastomers to have a hope of sealing.

 

[tbuelna]

A valve that uses a seal of an elastomer compound or PTFE will not be suitable for even brief exposure to intimate contact with fluid temperatures of 600degC. There are elastomers that can tolerate extended exposure to temps of 350degF. PTFE can tolerate exposure to 400degF, except that it will suffer creep. The only type of valve that can tolerate the temperatures and pressures you require are all-metal valves.

 

[asimpson]

Many thanks.

Can anyone know a manufacturer of all metal solenoid valves that would be ecconomical for domestic products? 2-5 mm orifice.

So far all I have found is large industrial valves for plant and similar.

Yours,

Alan