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Valves for anhydrous ammonia service

Valves for anhydrous ammonia service

Valves for anhydrous ammonia service

(OP)
What is a good, basic isolation valve for anhydrous ammonia service, not refrigerated storage. We currently have SS gate valves, 2" and 3" 300# class that are not sealing well at all under nitrogen pressure testing. Is a gate valves appropriate for this service?, metal to metal ball valves or soft seat ball valves?

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