Specifications
The Specifications section on this page provides specifications for the ES-805 and ES-905 Series vent valves. Specifications
such as model number, connection size, date of manufacture, valve type, seal materials and pressure/vacuum settings are
stamped on the nameplate attached to the vent valve. Weights are keyed to the pallet stem. Every weight is stamped with the
setting (oz.), the valve size and the part number.
Available Construction
See Figure 3
Available Sizes
2 through 4 in. / 50 through 100 mm
Set Pressure/Vacuum
(1)
See Table 1
Construction Materials
See Table 2
Approximate Weight
ES-805 Series Vent Valve
2 In. / 50 mm body:
12 lbs. / 5 kg
3 In. / 80 mm body:
17 lbs. / 8 kg
4 In. / 100 mm body:
23 lbs. / 10 kg
ES-905 Series Vent Valve
2 In. / 50 mm body:
11 lbs. / 5 kg
3 In. / 80 mm body:
15 lbs. / 7 kg
4 In. / 100 mm body:
19 lbs. / 9 kg
1. The pressure limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
Product Description
ES-805 and ES-905 Series vent valves represent the latest
development in high-performance, tight-sealing tank venting
products and complement Enardo™’s industry-leading
ES-665 Series thief hatch product line. With a leakage
rate of no more than 0.1 SCFH at 90% of set point, the
ES-805 and ES-905 Series offers unparalleled vent
valve performance.
Model ES-805-SO
- is an In-line vent valve. It is installed
directly into the vent line exhaust. The Model ES-805-SO
has both pressure and vacuum relief capability.
Model ES-805-PSO
- is a pressure only vent valve designed
to relieve pressure only through the vent line. It is designed
the same as the Model ES-805-SO pressure/vacuum except
they omit the vacuum side of the valve that eliminates the
possibility of two way flow.
Model ES-905-SO
- is an end-of-line vent valve. The
end-of-line vent valve is installed directly on the end of the
vent line exhaust. The Model ES-905-SO has both pressure
and vacuum relief capability.
Model ES-905-PSO
- is an end-of-line vent valve. The
end-of-line vent valve is installed directly on the end of the
vent line exhaust. The Model ES-905-PSO only has pressure
relief capability.
Principle of Operation
ES-805 and ES-905 Series vent valves are designed to
prevent the escape of light ends of crude by maintaining
pressure in the storage tank.
The vent valve opens when the system pressure or vacuum
exceeds the set pressure of the valve. When over pressure
occurs, the pallet lifts, breaking the seal between the seat
and pallet, allowing vapors to pass through the valve orifice
and relieving the pressure or vacuum buildup. The valve
closes once the tank pressure goes below the set pressure.
Model Identification
Tagging Information
For ES-805 Series, the nameplate is located on the unit’s lid
and for ES-905 Series, the nameplate is located on the unit’s
hood. Actual layout of nameplate may vary.
Installation
!
WARNING
The valve and its pallet assembly are shipped
separately. The pallet assembly may be heavy
and can cause personal injury or damage to the
unit if not handled with care.
All wing-nuts shall be hand tightened only.
Tools are not to be used.
Prior to installation, remove the unit from its packaging
and discard any protective coverings. Below is a list of
instructions that are recommended for the installation of an
Enardo vent valve.
ES
8
25
PSO
Figure 3. Model Number Identification
Series
8 = 805
9 = 905
Size
25 = 2 in.
35 = 3 in.
45 = 4 in.
Pressure Type
SO = Pressure and Vacuum
PSO = Pressure Only
2
ES-805 and ES-905 Series
North America
Only
