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What is the purpose of the pneumatically controlled three-way valve on the air pipeline in the HG instrument installation diagram?

2025-11-26View Original

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It seems that when the air supply is normal, the control valve functions properly; but when the air supply decreases, this air-controlled three-way valve releases the air from the valve cylinder. With this feature, projects now install pressure transmitters directly on the main gas supply line; when the pressure drops below the set interlock value, all valves return to their fault position. In that case, does the pneumatically controlled three-way valve lose its purpose?

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