DZ/EA-F

Pressure or Vacuum Relief Valve, In-Line With ETFE Lining

Function and Description

The lined PROTEGO® in-line valve DZ/EA-F is a state-of-the-art pressure or vacuum relief valve in right angle design for higher set pressures. The lining makes this model a perfect solution for corrosive, polymerizing or sticky media. All internal parts are manufactured from PTFE or other highly corrosion resistant materials. Typically the valve is installed in the in- or out-breathing lines of tanks, vessels and process apparatus to protect against unallowable high or low pressure. The valve prevents emission losses almost up to the set pressure or provides protection from product entry into the system. This spring loaded model allows higher set pressures than the DZ/EA.

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. Due to our highly developed manufacturing technology the tank pressure is maintained up to set pressure with a tightness that is far superior to the conventional standard. This feature is facilitated by use of hastelloy valve seats and with individually lapped valve pallets (1). After the excess pressure is discharged or the vacuum is compensated, the valve reseats and provides a tight seal.

The optimized fluid dynamic design of the valve body and valve pallet is a result of many years of research work, which allow a stable operation of the valve pallet and optimized performance resulting in reduction of product losses.

Features and Advantages

• “full lift type” technology valve utilizes only 10% overpressure to reach full lift
• high performance seal reducing product loss below EPA’s 500ppm rule preventing environmental pollution
• based on 10% technology the set pressure is close to the opening pressure which results in best possible pressure management of the system compared to conventional 40%- or 100%- technology valves
• internal lining and correct material selection makes this type the perfect solution for corrosive, polymerizing and sticky media
• optimized flow performance, which reduces capital cost to a minimum as smaller sized valves may be used
• can be used as pressure or vacuum relief valve
• compact right angle design saves space
• housing designed to 150 psi (PN 10)
• spring loaded design for higher set pressures
• maintenance friendly design

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