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High temperature operator for valve

High temperature operator for valve

High temperature operator for valve

(OP)
I need to install a small valve inside an oven operating at 150C.  The oven wall is also a contamination control boundary so the valve operator will have to be inside the oven.  Can anyone recommend a source of commercial valve operators which would operate in this service?  I have sketched out a spring-to-close, air-to-open metal bellows actuator which could be designed, but I would rather purchase a commercial product.  Any suggestions?

RE: High temperature operator for valve

On-off or proportional control?
At 150C, you are within the reasonable range for Viton or Kalrez seals, at least for an on-off actuator. Proportional control is touchier as you cant afford any stiction or hysteresis, and even an old-fashioned pneumatic positioner is likely to worry at 150C. But I would suggest go talk to your most cooperative control valve salesman; you may be surprised.

RE: High temperature operator for valve

(OP)
The actuation is on-off.  I didn't mention the size of the valve.  The maximum size will be 1/4" tube.  I would prefer metal bellows sealed valves, but would live with Kalrez if necessary.  The valve and seal bellows will be Hastelloy C-276.  A Kalrez seat would be fine.  Viton won't handle the chemical service.

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