Small built-in leaks prevent overheating. Downstream flow-control globe valve replaced with modified gate valve. Modification consists of drilling small hole through valve gate, so valve never turned completely off. This "leaky" valve provides enough flow of coolant to prevent overheating causing probe to fail. Principle also applied to automatic control system by installing small bypass line around control valve.
Coolant-Control Valves For Fluid-Sampling Probes
NASA Tech Briefs ; 13 , 5
1989-05-01
Miscellaneous
No indication
English
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