Consolidated 2700 Series Safety Valve Instruction Manual
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Table 11: Nameplate Symbols
ASME Boiler and
Pressure Vessel Code
Section and Symbol
Set pressure tolerance (the valve must “POP” open
within the range indicated below.)
Blowdown requirements
If valve set pressure is less than or equal
to 70 psig (4.83 barg)
± 2 psig (0.14 barg)
After opening, the valve
must reclose within a range
of 98 percent to 96 percent.
However, if the valve set
pressure is 100 psig (6.89
barg) or less, the valve must
reclose within a range of 2
to 4 psig (0.14 to 0.28 barg)
below set pressure.
If valve set pressure is 71 psig (4.90 barg) up to and
including 300 psig (20.68 barg)
± 3 percent of set pressure
If valve set pressure is 301 psig (20.75 barg) up to
and including 1000 psig (68.75 barg)
± 10 psig (±0.69 barg)
If valve set pressure is 1001 psig (69.02 barg)
or greater
±1 percent of set pressure
CODE SYMBOL
STAMP
ASME Section XIII
(UV)
If valve set pressure is less than or equal to
70 psig (4.83 barg)
± 2 psig (±0.14 barg)
After opening, the valve must
reclose before the system
pressure returns to normal
operating pressure.
If valve set pressure is 71 psig (4.90 barg) or greater
± 3 percent of set pressure
V
UV
Table 12: Recommended Operating Gap
Boiler Design Pressure
Minimum Differential as a Percent of Boiler
Design Pressure
Over 15 to 300 psig (1.03 to 20.68 barg)
10 percent but not less than 7 psi (0.48 barg)
Over 300 to 1000 psig (20.68 to 68.95 barg )
7 percent but not less than 30 psi (2.07 barg)
Over 1000 to 2000 psig (68.95 to 137.90 barg )
5 percent but not less than 70 psi (4.83 barg)
CODE SYMBOL
STAMP
ASME Section I
XV. Setting and Testing (Cont.)