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VD/KSM-PA

Pressure and Vacuum 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
  • automatic condensate drain
  • high surface quality
  • different plastics can easily be combined
  • maintenance-friendly design

Function and Description

The PROTEGO® valve VD/KSM-PA is a state-of-the-art pressure and vacuum relief valve with excellent flow performance made of high-grade synthetic material. Typically, the valve is installed in the in-breathing and out-breathing lines of tanks, vessels, and process equipment to protect against unallowable overpressure and under pressure.

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 requires 10% overpressure to 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 and vacuum (MAWP and MAWV) of the tank and still safely vent the required mass flow. The opening characteristic for the pressure and vacuum sides is the same.

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 or the vacuum is balances, 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.

Dimensions

To select the nominal size (DN), use the flow capacity charts on the following pages

DN150 / 2" 80 / 3" 100 / 4" 150 / 6" 200 / 8"
DN250 / 2"80 / 3"100 / 4"150 / 6"200 / 8"
a490 / 19.29650 / 25.59775 / 30.51930 / 36.611260 / 49.61
a(750 / 29.53)*(958 / 37.72)*(1200 / 47.24)*
b376 / 14.80521 / 20.51563 / 22.17670 / 26.38879 / 34.61
b(523 / 20.59)*(651 / 25.63)*(912 / 35.91)*
c150 / 5.91200 / 7.87225 / 8.86280 / 11.02350 / 13.78
d200 / 7.87245 / 9.65300 / 11.81370 / 14.57590 / 23.23
d(650 / 25.59)*
e180 / 7.09250 / 9.84300 / 11.81350 / 13.78560 / 22.05
e(405 / 15.94)*(500 / 19.68)*
Dimensions in mm / inches *Dimensions in brackets only for PVDF

Material selection for housing

Design A B C
HousingPEPPPVDF
Valve seatPEPPPVDF
SealingFPMFPMFPM
Pressure valve palletA, C, DB, C, DC, D
Vacuum 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
SealingPTFEPTFEPTFEPTFE
Spindle guidePEPPPVDFHastelloy
WeightPEPPPVDFHastelloy
Special materials and other pressure settings upon request

Material selection for vacuum 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
SealingPTFEPTFEPTFEPTFE
Spindle guidePEPPPVDFHastelloy
WeightPEPPPVDFHastelloy
Special materials and other vacuum settings upon request

Flange connection type

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

Design Types and Specifications

The valve pallets are weight-loaded, and the highest pressure levels are only attained with metal discs.

Pressure/vacuum valve in basic design

VD/KSM-PA

Additional special devices available upon request.

Settings

Pressure:

+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.

Vacuum:

-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 and lower settings upon request

Flow Capacity Chart

The flow capacity charts have been determined with a calibrated and TÜV certified flow capacity test rig. Volume flow V in (m³/h) and CFH refer to the standard reference conditions of air ISO 6358 (20°C, 1bar). For conversion to other densities and temperatures refer to Sec. 1: “Technical Fundamentals”.

VD/KSM-PA