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PILOT OPERATED TANK BLANKETING VALVE
Series No. 20
 Protectoseal Series No. 20, Pilot
Operated Tank Blanketing Valve, is designed to regulate the flow of a blanketing
gas (usually Nitrogen) into the vapor space of a flammable liquids storage tank.
The valve senses the pressure in the vapor space and opens to allow a flow of
gas into the tank when the pressure drops below its set point. When tank
pressure returns to the valve's set point, the flow of gas is stopped.
The Series No. 20 valve consists of a main valve (which controls the flow of
inert gas into the tank), and the pilot valve (which accurately senses the
tank's pressure and controls the opening and closing of the main valve). This
tandem valve arrangement provides extremely accurate control of the flow of gas
into the tank. The pressure balanced poppet in the pilot ensures that a
consistent opening set pressure is realized over the range of allowable inert
gas supply pressures. The Series No. 20, Pilot Operated Tank Blanketing Valve,
requires a very small band of pressure to cycle from closed, to open and fully
flowing, to resealed.
 | Designed specifically for tank blanketing
| Pilot operated design provides very tight operating band
| Compact, light weight design
| 1" NPT inlet and outlet standard
| Optional inlet and outlet connections available
| Accommodates inlet gas pressures from 20 PSIG to 200 PSIG
| Set points from -0.5 inches water column to 69.2 inches water
column
| Optional flow plugs to meet specific flow requirements
| Fully field serviceable
| Pressure balanced poppet provides consistent opening over a full
range of inlet gas pressures
| Optional pilot and sense line gauges
| System purge and field test capability available
| Factory tested and certified
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Materials of Construction
VALVE BODY &
COMPONENTS |
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STANDARD:
CUSTOM: |
316 Stainless Steel
Others |
FITTINGS &
HARDWARE |
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STANDARD:
CUSTOM: |
316 Stainless Steel
Others |
| SPRINGS |
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302 Stainless Steel |
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| SOFT GOODS |
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STANDARD:
CUSTOM: |
Buna-N
Neoprene, Viton®, EPDM,
Chemraz®, Kalrez® & others |
| DIAPHRAGM |
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Teflon® |
| FILTER |
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STANDARD:
CUSTOM: |
Aluminum/Zinc/Polypropylene/
Buna-N/Acetal
Stainless Steel/Polypropylene/
Viton®/Acetal |
| Viton® is a registered trademark of DuPont
Dow Elastomers. |
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