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Pressure Relief Valve made of plastic

  • 10% technology for minimum pressure increase up to full lift
  • extreme tightness, resulting in lowest possible product losses and reduced environmental pollution
  • set pressure close to opening pressure for optimum pressure maintenance in the system
  • valve pallet is guided inside the housing to protect against harsh weather conditions
  • non-corrosive
  • especially suitable for aggressive, sticky, or polymerizing substances
  • weight reduction in comparison to steel/stainless steel
  • high surface quality
  • automatic condensate drain
  • different plastics can easily be combined
  • maintenance-friendly design

Функция и описание

The PROTEGO® valve D/KSM is a state-of-the-art pressure relief valve with excellent flow performance made out of high grade synthetic material. It is primarily used as a safety fitting for relieving pressure in tanks, containers, and process engineering equipment. The valve prevents emission losses almost up to the set pressure. The valve is a perfect solution for corrosive, polymerizing, or sticky substances. The device will start to open as soon as the set pressure is reached and only required 10% overpressure to reach full lift.

Continuous investments in and a commitment to 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 at just 10% below the maximum allowable working pressure (MAWP) 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 the set pressure with a tightness that is far superior to the conventional standard. This feature is achieved by special valve seats made of high quality synthetic material or PTFE. After the excess pressure is released, the valve re-seats 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, resulting in a stable operation of the valve pallet, optimized performance, and reduced product losses.

Таблица параметров

To select the nominal size (DN), use the flow capacity chart on the following page

DN50 / 2" 80 / 3" 100 / 4" 150 / 6" 200 / 8"
a376 / 14.80521 / 20.51563 / 22.17687 / 27.05952 / 37.48
a(543 / 21.38)*(681 / 26.81)*
b180 / 7.09250 / 9.84300 / 11.81350 / 13.78560 / 22.05
b(405 / 15.94)*(500 / 19.68)*
размер в мм * Dimensions in brackets only for PVDF

Выбор материала корпуса

Design A B C
Valve seatsPEPPPVDF
Valve palletA, C, DB, C, DC, D
Special materials upon request

Material selection for pressure valve pallet

Design A B C D
Pressure range [mbar]
[inch W.C.]
+6,0 up to +16
+2.4 up to +6.4
+5,5 up to +16
+2.2 up to +6.4
+9,5 up to +30
+3.8 up to +12

+30 up to +100

+12 up to +40

Valve palletPEPPPVDFHastelloy
Spindle guidePEPPPVDFHastelloy
Special materials and other pressure Settings are available upon request

Вид фланцевого соединения

 EN 1092-1, Форма B1
ASME B16.5 CL 150 F.F.
other types upon request

Модели и спецификация

The valve pallet is weight-loaded, and the highest pressure levels are only attained with metal disks.

Pressure valve in basic design


Additional special devices available upon request.



+6.0 mbar +100 mbar (DN 50/2”)
+2.4 inch W.C. +40 inch W.C.
+4.0 mbar +100 mbar (DN 80/3”)
+1.6 inch W.C. +40 inch W.C.
+4.5 mbar +100 mbar (DN 100/4” - DN 200/8”)
+1.8 inch W.C. +40 inch W.C.
Higher pressure settings upon request.

Диаграммы пропускной способности

Диаграммы пропускной способности были определены с помощью калибрированной и сертифицированной объединением технического надзора (TÜV) проточной измерительной установки. Пропускная способность V. в м³/час определена воздухом при нормальных атмосферных условиях в соответствии с ISO 6358 (20°C, 1 бар). Преобразование для различных плотностей и температур см. главу 1: Технические основы