VD/SV-PA (L) Pressure Vacuum Relief Valve

The VD/SV-PA(L) type Protego valve is a highly developed pressure and vacuum relief valve with excellent flow performance. 

Typically the valve is installed in the in-and outbreathing lines of tanks, vessels and process apparatus to protect against unallowable high and low pressure. 

The valve prevents emission losses almost up to the set pressure and prevents air intake almost up to set vacuum. 

The product vapors can be discharged through a collective line connected to the line flange on the pressure side. 

The device will start to open as soon as the set pressure is reached and only requires 10% overpressure to full lift. 

Continuous investments into research and development have allowed Protego to develop a low pressure valve which has the same opening characteristic as a high pressure safety relief valve. 

This "full lift type" technology allows the valve to be set just 10% below the maximum allowable working pressure or vacuum (MAWP or MAWV) of the tank and still safely vent the required mass flow. 

The opening characteristic is the same for pressure and vacuum relief.