ERGIL Storagetech™ Pressure Vacuum Relief Valve (Top mounted, pipe-away, spring-loaded)
Model No: 121
ERGIL Storagetech™’s Model 121 Pressure-Vacuum Relief Valve provides protection to bulk storage tanks and vessels from over and under pressurisation. The valves are mounted on the tank roof flange or a vent pipe from the vapour space.
In the closed position the pressure relief 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 increases, due to product filling and vapour development, the pressure in tank increases and in the event that the set pressure of the unit is reached, the diaphragm will open and discharge the gas to atmosphere. The opening set-point is selectable from a range between +61 mbar and +1000 mbar (+24 inch W.C. and 400 inch W.C.), and the valve will reseal when the tank returns to a safe pressure.
The vacuum pallet and diaphragm assembly is similarly maintained in the closed position. 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 opens to admit air and rebalance the internal pressure. The vacuum set-point is selectable from a range between +61 mbar and +1000 mbar (+24 inch W.C. and 400 inch W.C.). The valve will reseal when the tank returns to a safe pressure.
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.
|Pressure||: Spring-loaded +61 mbar and +1000 mbar (+24 inch W.C. and 400 inch W.C.)|
|Ambient temp||: -20°C to +60°C|
|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|
|Springs||: Stainless steel|
1-) 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.
Data sheet, Pressure Relief, Vacuum Relief, and Pressure-Vacuum Relief Valves
- Elsewedy Electric PSP
Conducting business with ERGIL in the floating suction unit was a smooth process. Professional engineering - Read more
- Aegis Logistics Ltd. States
We feel happy to have been introduced to a team of professionals for our requirement of Internal - Read more
- IE Immanuel Engineering Pte.
While working with ERGIL, response has always been swift and guaranteed, whether it’s a working day or an official - Read more
- Tecnovent SL
We are glad to grow and expand together with ERGIL through the national territory and part South America. We - Read more