Safety valve Model 51

Safety valve at 90º between the inlet and the outlet connections, full nozzle and direct action and spring loaded, with pop action and full lift.


Performance Features

  • Suitable for all overpressure process applications requiring a flanged connection and a re-closeable relief technology
  • Set Pressure available from 7.5 to 6,000 psig
  • Sizes from 1/2" x 3/4" to 1" x 1 1/4" (15mm x 20mm to 25mm x 35mm)
  • Conventional and bellows versions available for applications with variable back pressures
  • Continuous processing (automatic spring reset to continue operation)
  • Suitable Hazardous service
  • ASME “UV” stamped, section XIII
  • European Pressure Equipment Directive “CE” marked

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  • Set Pressures
  • Materials
  • Accessories/Connections
  • Documentation

Set Pressures

Model 51™ Capabilities
Inlet Size Outlet Size Flow Area Orifice (Designator) Diameter Lift Set Pressure Range Media
0.5 - 1 NPS 0.75 - 1 NPS 0.048 sq in [C] 0.248 in 0.071 in 15-6237 psi Air
0.5 - 1 NPS 0.75 - 1 NPS 0.048 sq in [C] 0.248 in 0.071 in 15-2900 psi Steam
0.5 - 1 NPS 1 NPS 0.122 sq in [D] 0.394 in 0.118 in 15-4206 psi Air
0.5 - 1 NPS 1 NPS 0.122 sq in [D] 0.394 in 0.118 in 15-2900 psi Steam
0.75 - 1 NPS 1 NPS 0.196 sq in [E] 0.5 in 0.15 in 15-2900 psi Air
0.75 - 1 NPS 1 NPS 0.196 sq in [E] 0.5 in 0.15 in 15-2900 psi Steam

 

Inlet Size Outlet Size Flow Area Orifice (Designator) Diameter Lift Set Pressure Range Media
0.5 - 1 NPS 0.75 - 1 NPS 0.048 sq in [C] 0.248 in 0.087 in 15-6237 psi Water
0.5 - 1 NPS 1 NPS 0.122 sq in [C] 0.394 in 0.138 in 15-4206 psi Water
0.75 - 1 NPS 1 NPS 0.196 sq in [C] 0.5 in 0.177 in 15-2900 psi Water

Materials of Construction

Minimum Standard Materials
  Carbon Steel Stainless Steel Low Temp Carbon Steel
Body ✓ ✓ ✓
Disc and Spindle (Internals)   ✓  
Alternative Materials availabile upon request, e.g Inconel 625, Duplex, Supler Duplex

Dimensions

Accessories

Test-Gag

O-Ring

Heating Jacket

Lever

Connections

Threaded Female

Threaded Male

Socket Welding

Butt Welding

Product Literature

Model 51 Brochure

Installations

Model 51 Installation Instructions