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Large Pressure Relief Device. Operating and Testing Instructions. Background. The Qualitrol Series 208/213/216/LPRDOO Large Pressure Relief Devices (PRD)Qualitrol LPRD/208/213/216 Large Pressure Relief Device. Mechanical device for relief of excessive pressure buildup in large volumes of gas or fluid. []. Contact your local sales representative or QUALITROL Application Engineer to review your special requirements. ? Page 3. ELECTRICAL. CONNECTION. (QUALITROL. Available with a stainless steel pull ring to allow for manual operation. Optional port protection with cover for inhibiting matter from entering the valve body Mechanical device for relief of excessive pressure buildup in large volumes of gas or fluid. Patented dual gasket system provides quick response time and The Qualitrol LPRD 208 is the global standard for Transformer Pressure Relief Devices. The LPRD is used for the relief of excessive pressure buildup in Medium Pressure Relief Device (MPRD) is designed for over-pressure conditions on oil filled transformers, load tap changers, and other related electrical Mechanical over pressure protection device with integrated directional discharge outlet. Provides pressure relief and insulating fluid containment (requires QUALITROL manufactures monitoring and protection devices for high value electrical assets and OEM manufacturing companies. Established in 1945, QUALITROL