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Enardo 450 and Enardo 550 Series
Specifications
The Specifications section on this page provides specifications for the Enardo 450 and Enardo 550 Series
pressure/vacuum relief valve. Specification is stamped on the nameplate attached to the relief valve. Refer to
Product Identification and Marking section for the nameplate details.
Available Construction
See Figures 3 and 4
Available Sizes
2 to 12 in. / 50 to 300 mm
Pressure Setting Range
Enardo 450 Series:
0.5 to 12.0 oz./sq. in.
1.0 to 21.0 in. w.c.
2.0 to 50.0 mbar
Enardo 550 Series:
0.5 to 12.0 oz./sq. in.
1.0 to 21.0 in. w.c.
2.0 to 50.0 mbar
(1)(2)(3)
Vacuum Setting Range
Enardo 450 Series:
0.5 to 12.0 oz./sq. in.
1.0 to 21.0 in. w.c.
2.0 to 50.0 mbar
1. The pressure limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
2. Pressure or vacuum setting has an increment of 0.5 oz./sq. in., 0.5 in. w.c. or 2.2 mbar.
3. Pressure and vacuum settings vary by size. Refer to Table 1 for details.
x
Enardo 450 —
Inlet
Connection
Connection
Size
2 to 12 in.
Figure 3. Enardo 450 Series Pressure/Vacuum Relief Valve Available Constructions and Model Numbering System
Teflon
®
®
and Viton
are marks owned by E. I. du Pont de Nemours and Co.
2
(1)(2)(3)
—
Outlet
Housing
Material
Size
3 to 14 in.
1 = Aluminum
2 = 316
4 = Stainless
steel
5 = Carbon
steel
Vacuum Setting Range
Enardo 550 Series:
0.5 to 12.0 oz./sq. in.
1.0 to 21.0 in. w.c.
2.0 to 50.0 mbar
Maximum Pressure/Vacuum Setting
See Table 1
Housing Material
Aluminum, Carbon steel or Stainless steel
Certification
EN IEC 60079-0:2018
EN IEC 60079-11:2012
EN ISO 80079-36:2016
EN ISO 80079-37:2016
Pallet
Pallet
Pressure
Material
Seal
Settings
Material
1 = FEP Teflon
®
z = oz./sq. in.
Stainless
2 = Buna-N
n = in. w.c.
steel
3 = Viton
®
mb = mbar
0.5 to 12.0 oz./sq. in.
(0.5 oz./sq. in. increments)
1.0 to 21.0 in. w.c.
(0.5 in. w.c. increments)
2.0 to 50.0 mbar
(2.2 mbar increments)
(1)(2)(3)
(continued)
(1)
/
—
Vacuum
Options
Settings
O = No Options
A = Special Coating
B = S.S. Weights
E = Optional Gasket
Material
G = Steam Jacket or
Trace
J = Seat Material
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