DV/ZU

The PROTEGO® in-line valve DV/ZU is a state-of-the-art pressure and vacuum relief valve Pressure and vacuum relief valve A pressure and vacuum relief valve is a pressure equalization valve for impermissible pressure and vacuum in a closed system. with separate flange connections for pressure and vacuum Vacuum Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. breathing. Typically, the valve is installed in the in-breathing and out-breathing lines of tanks, vessels, and process equipment Equipment Machines, appliances, fixed or mobile devices, control parts and accessories, and warning and prevention systems, whether separate or combined, intended for the generation, transfer, storage, measurement, control, and conversion of energy, and for the processing of materials, which have their own potential source of ignition and may cause an explosion. to protect against unallowable overpressure Overpressure Overpressure refers to an increase in pressure in a system or vessel above the normal operating pressure. and underpressure. The valve prevents emission losses almost up to the set pressure and prevents unacceptable product entry. It is designed in a way that if the set pressure is exceeded, the vapors are released into anexhaust pipe (e.g., vent header Vent header Piping system that collects and delivers the relief gases to the vent stack. ). If the set vacuum Set vacuum Internal negative gauge pressure at which a vacuum valve first opens. is exceeded, atmospheric air is pulled into the system. For structural reasons, the vacuum valve pallet Valve pallet Valve pallet is the generic term for the assembly that rests on the valve seat. is one size smaller than the pressure valve pallet.

Due to our highly developed manufacturing technology, the tank pressure Tank pressure Tank pressure is the pressure within a tank. is maintained up to set pressure with a tightness that is far above the conventional standard. This feature is ensured by valve seats made of high quality stainless steel and with individually lapped valve pallets (1), or with an air cushion seal Seal A seal prevents or limits unwanted transfer of product from one container to another. Seal is used as superordinate term for all types of sealing elements. (2), in conjunction with high quality FEP diaphragm Diaphragm A diaphragm is a thin layer of material, which has a large surface area. . The valve pallets are also available with a PTFE seal to prevent the valve pallets from sticking when sticky products are used and to enable the use of corrosive fluids. After the overpressure is released or the vacuum is balanced, the valve re-seats and provides a tight seal. The optimized fluid dynamic design of the vent body and vent pallet is a result of many years of research, resulting in stable operation of the valve pallet, optimized performance, and reduced product losses.