D/PA(L)

The D/PA(L) type PROTEGO® valve is a highly developed 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 excellent flow performance. 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 air intake almost up to the set vacuum Set vacuum Internal negative gauge pressure at which a vacuum valve first opens. . The product vapors can be released through a collective line connected to the line flange on the pressure side. Backflow is not possible, i.e. the valve can be used as an overflow valve or backflow protection.

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 superior to the conventional standard. This feature is valve seats made of high quality stainless steel and achieved by valve seats made of high quality stainless steel and with precisely 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 substances. After the excess pressure is released or the vacuum is balanced, the valve reseats and provides a tight seal. The optimized fluid dynamic design of the valve body and valve pallet Valve pallet Valve pallet is the generic term for the assembly that rests on the valve seat. is a result of many years of research, resulting in stable operation of the valve pallet, optimized performance, and reduced product losses.