Qualitrol LPRD 208 Large Pressure Relief Device

Qualitrol LPRD 208 Large Pressure Relief Device

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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 large volumes of gas or fluid in transformers. Its patented dual gasket system provides quick response time and automatically reseals after pressure has subsided. Options include local operation indication, contacts (switches) for operation alarming, and directional shield for hot oil and gas exhaust control.

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The global standard in pressure relief devices

The 208 LPRD by Qualitrol is the world’s leading pressure relief device - made by the pioneers of “automatically resealing” pressure relief devices. The LPRD has been refined for maximum reliability over more than 50 years in service and 400,000 units of field experience. No wonder it is the most frequently customer specified pressure relief device by name.

100% tested for quality and safety when it is most needed

All Qualitrol LPRDs are 100% pressure tested for proper operation pressure, with test results serialised for traceability. The LPRD delivers confidence for all over-pressure protection applications: on oil filled transformers, load tap changers, and other related electrical apparatus.

With robust design and built from rugged materials the Qualitrol LPRD provides reliable protection and long life, even in hard-wearing applications.

 
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Qualitrol LPRD 208 Brochure

Large pressure relief device

 

Features of the Qualitrol 208 Transformer LPRD


  • World’s leading pressure relief device pioneered automatically resealing pressure relief

  • Greater than 50 years and 400,000 units of field experience in pressure relief have enabled Qualitrol experts to refine designs for maximum reliability

  • Most frequently customer specified pressure relief by name

  • Robust design and materials provide reliable protection and long life

  • Dual gasket design provides amplified force for rapid operation

  • Patented secondary seal wiper gasket provides more reliable resealing

  • Stainless steel operating valve, fasteners, and hardware

  • Flange and ring are made from aluminium with a chromate conversion coating with exposed aluminium components receiving an additional epoxy paint coat

  • Switches can be specified to operate as latching or momentary, SPDT or DPDT, high DC, or low current gold contact type, and with connector, terminal box, or flying lead style connections

  • Device can be top mounted horizontally (recommended) or side mounted vertically for maximum installation flexibility

  • 100% tested for quality assurance

  • Test results are serialised for traceability

  • Visual and remote indication of operation

  • Standard units support up to two alarms switches that can be mounted directly to the device or on the directional shield

 
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208 LPRD Options


  • Operating pressure, gasket material and type, hood material, Indicator style and colour

  • Up to 2 latching or momentary switches (single or double pole form C, high DC, or low current gold contacts)

  • Electrical connection style

  • Gas bleed system

  • Optional directional shield can be coupled with piping, providing maximum protection of equipment, personnel and the environment by redirecting the flow of hot oil and gas

  • Optional semaphore (flag) provides visual indication of actuation and is available in different colours and materials

  • Main cover is available in zinc clad steel (208/213) or stainless steel (216) for added durability and corrosion resistance

 
Greater than 50 years and 400,000 units of field experience in pressure relief have enabled Qualitrol experts to refine designs for maximum reliability
— Qualitrol
 
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