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Vacuum Relief Valve (End of line, weight loaded)

Model No: 190

ERGIL Storagetech™’s Model 190 Vacuum Relief Valve ensures that the pressure in the bulk storage tank does not fall below the safe operating range needed to prevent implosion damage. It is fitted on a tank roof flange or pipe that connects to the vapour space of a storage tank.

In the closed position the weight-loaded pallet and diaphragm assembly is held tightly against a seal to prevent the loss of vapour to atmosphere. As the internal pressure in the tank reduces, due to emptying, the balance between the tank pressure and the external atmospheric pressure changes, and when the set pressure of the unit is reached, the diaphragm will open to admit air and rebalance the internal pressure. The opening set-point is selectable from a range between +2.0 mbar and +60 mbar. (+0.8 inch W.C and +24 inch W.C).

The vent will close when the tank returns to a positive pressure. A mesh filter screen over the air inlet port prevents the ingress of atmosphere-borne debris.

Several features are inherent in the valve design to ensure a smooth, positive and effective operation. The body is self-draining and drip rings prevent condensate from settling on seating surfaces. A diaphragm and seal manufactured from Teflon reduce the possibility of ice formation and sticky residues hindering the valve from opening, while the pallet assembly moves freely on guide posts.

Setting Range

Vacuum: Weight-loaded +2.0 mbar and +60 mbar. (+0.8 inch W.C and +24 inch W.C)
Ambient temp: -20°C to +60°C


Construction

Standard sizes: 2” to 12” 50 to 300mm
Flanges: API Class 150 RF, DIN PN16
Body: Carbon steel, stainless steel, or aluminium
Seals: Nitrile, Teflon, and Klingrit
Pallet: Stainless steel AISI 304
Weights: Stainless steel
Paint finish1-) Powder Coating, Colour RAL 9006
2-) Epoxy Paint, Colour RAL 9006
3-) Customer Specification
ATEX cert: Ex II 1/2 G c IIB


Design & Manufacturing Specifications

The integrity of the seal is tested for leakage in accordance with API Standard 2521 - Use of Pressure-Vacuum Vent Valves for Atmospheric Loss.

The size of the vent should be calculated in accordance with API Standard 2000 (ISO 28300) - Venting Atmospheric and Low-Pressure Storage Tanks or other international standards.

Additional Information

Data sheet, Pressure Relief, Vacuum Relief, and Pressure-Vacuum Relief Valves

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