Best Performance XPRD Safety Valve

Application areaApplication area

Mechanical overpressure protection devices with built-in directional discharge pipe. Provides pressure relief and storage of insulating fluid (requires additional piping) on ​​transformers and transformer winding tap changers when overpressure conditions occur. Automatically restores seal after pressure release.

Used to provide maximum critical overpressure protection on critical oil-filled transformers, load winding switches and other liquid-filled equipment.

Advantages:

  • 50% percent better transformer protection at critical overpressures
  • Less impact on the environment and less cleanup work
  • Protect workers and equipment from hazardous oil spills
  • Corrosion resistant design
  • Wide range of installation options

Possibilities:

  • Double spring valve ensures precise actuation and re-closing after pressure situation
  • 50% higher flow rate than LPRD to increase tank protection during overpressure situations (12600 SCFM)
  • Uses the same bolt pattern as LPRD and industry standards allowing direct replacement
  • Standard built-in guard with 8" outlet diameter for fastest, targeted release of hot oil and gas
  • Reduces risk to the environment, surrounding assets and people in the immediate area when used in conjunction with piping kits
  • A variety of optional piping, flange and animal screen kits are available from Qualitrol for hot oil drainage

Options:

  • Operating pressure, seal material and indicator type
  • Up to 2 latching or momentary switches (single or double pole Form C, high DC or low current contacts)
  • Electrical connector type
  • Gas release system
  • Stainless steel piping and housing options
Specifications
Dimensions Recommended tank opening   171.5 mm [6.75 in]
  Casing bending radius:                323.3 mm [12.73 in]
Electrical parameters Switch options Standard – 10 A at 125/250 VAC
    Non-inductive – 0.5 A at 125 VDC
    Non-inductive – 0.25 A at 250 VDC
    High Current (SPDT only): 10 A at 125 VDC (DC)
    Low Level Circuits (Gold Contacts): 0.1 A at 125 VAC
    DPDT Switch: 10 A @ 125/250 VAC; 0.5 A at 125 VDC, non-inductive; 0.25 A at 250 VDC, non-inductive; 0.25 A at 250 V (DC), non-inductive
  Dielectric strength        AC 2000V, 50/60Hz for 1 minute
Working conditions Working temperature                  -40 to 80°C (-40 to 176°C) at 30°C ambient oil temperature
  Salt chamber test     The materials and coating have withstood 1,000 hours of salt chamber testing per ASTM B:117 without noticeable loss of strength in any structural members
  Switch housing                  Meets IP54 requirements
Materials Basic flange                         Die-cast aluminum, light gray powder coated ASA 70
  Ring                                       Aluminum casting, ground conversion coating
  Valve                                       Stainless steel, seal areas lubricated with silicone-based lubricant
  Indicator (semaphore)                 Aluminum with nylon or epoxy/polyester coating
  Spring                                    ASTM A229 Oil Tempered Spring Wire, Epoxy/Polyester Coated
  Seals                               Nitrile (standard) or Viton (optional)
  Casing/housing                             Stainless steel
 
Signal contact                  block housing                            
Die-cast aluminum with polyester powder coating

Pressure Relief Characteristic             
Bandwidth 356.8 m3 per minute at a pressure of 1.05 atm., operating pressure 0.7 atm.