VD/KSM
Pressure and Vacuum Relief Valve made of plastic
Features
10% Technology
for Minimum Pressure Increase up to Full Lift
Extreme Tightness
Resulting in Lowest Possible Product Losses and Reduced Environmental Pollution
Optimal Pressure Maintenance
Set Pressure Close to Opening Pressure for Optimum Pressure Maintenance in the System
Guided Valve Pallet
Valve Pallet Is Guided Inside the Housing to Protect Against Harsh Weather Conditions
Non-Corrosive
Aggressive, Sticky, or Polymerizing Products
Especially Suitable for Aggressive, Sticky, or Polymerizing Substances
Weight Reduction
in Comparison to Steel/Stainless Steel
Condensate Drainage
Automatic Condensate Drain
Different Plastics
can Easily Be Combined
Function and Description
Combined Pressure and Vacuum Relief Valve
The PROTEGO® Valve VD/KSM 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 apparatus to protect against unallowable overpressure or underpressure. The valve prevents emission losses almost up to the set pressure. The valve is a perfect solution for corrosive, polymerizing, or sticky substances.
Full Lift Technology
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 pressure and vacuum side is the same.
Advanced Manufacturing Technology
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 achieved by special valve seats made of high quality synthetic aterial or PTFE. After the excess pressure is released or vacuum is balanced, 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 stable operation of the valve pallet, optimized performance, and reduced product losses.
Product Data
Dimensions
To select the nominal size (DN), use the flow capacity charts on the following pages
| DN | 50 / 2" | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8" |
| a | 376 / 14.80 | 521 / 20.51 | 563 / 22.17 | 670 / 26.38 | 917 / 36.10 |
| a | (542 / 21.34)* | (681 / 26.81)* | (952 / 37.48)* | ||
| b | 430 / 16.93 | 575 / 22.64 | 700 / 27.56 | 825 / 32.48 | 1190 / 46.85 |
| b | (675 / 26.57)* | (880 / 34.65)* | (1100 / 43.31)* | ||
| c | 180 / 7.09 | 250 / 9.84 | 300 / 11.81 | 350 / 13.78 | 560 / 22.05 |
| c | (405 / 15.94)* | (500 / 19.68)* |
Dimensions in mm / inches
* Dimensions in brackets only for PVDF
Material selection for housing
| Design | A | B | C |
| Housing | PE | PP | PVDF |
| Valve seat | PE | PP | PVDF |
| Sealing | FPM | FPM | FPM |
| Pressure valve pallet | A, C, D | B, C, D | C, D |
| Vacuum valve pallet | A, C, D | B, C, D | C, 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 pallet | PE | PP | PVDF | Hastelloy |
| Sealing | PTFE | PTFE | PTFE | PTFE |
| Spindle guide | PE | PP | PVDF | Hastelloy |
| Weight | PE | PP | PVDF | Hastelloy |
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 pallet | PE | PP | PVDF | Hastelloy |
| Sealing | PTFE | PTFE | PTFE | PTFE |
| Spindle guide | PE | PP | PVDF | Hastelloy |
| Weight | PE | PP | PVDF | Hastelloy |
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
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”.
