Laminar Pte Ltd Singapore

Laminar Pte Ltd

Valves

Pressure Vacuum Relief Valve

Group 1 1
Group 1 1

Description

Pressure Vacuum Relief Valve provides protection to bulk storage tanks and vessels from over and under pressurization. The valves can be 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 are held tightly against a seal to prevent the loss of vapour to the atmosphere. As the internal pressure in the tank increases, due to product filling and vapour accumulation, the pressure in tank increases and in the event that the set pressure of the valve is reached, the diaphragm will open and discharge the gas into the atmosphere. The opening set-point is selectable from a range between +2.0 mbar and +60 mbar. The valve will close when the tank returns to a safe pressure.

The vacuum pallet and diaphragm assembly is also 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 +2.0 mbar and +60 mbar. The valve will close again 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.

Specifications

PN

API Class 150 RF, DIN PN16

DN

2” to 12” (DN50 to DN300)

Body Material

API Class 150 RF, DIN PN16

DN

2” to 12” (DN50 to DN300)

ATEX cert.

Ex II 1/2 G c IIB

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