VD/KSM
Pressure and Vacuum Relief Valvemade of plastic
Features
10% Technology
for minimum pressure increase up to full
lift
Lift
Lift is the actual travel of the valve pallet from the main valve out of the closed position.
Extreme Tightness
resulting in lowest possible
product
Product
Includes equipment, protective systems, devices, components and combinations of these.
losses and reduced environmental pollution
Optimal Pressure Maintenance
set pressure
Set pressure
Set pressure is the gauge pressure at the device inlet at which the relief device is set to start opening under service conditions.
close to opening pressure for optimum pressure
maintenance
Maintenance
Combination of all technical and administrative actions, including supervision actions, intended to maintain or restore a unit in working order.
in the system
Guided Valve Pallet
valve pallet
Valve pallet
Valve pallet is the generic term for the assembly that rests on the valve seat.
is guided inside the
housing
Housing
A housing is a solid shell, which surrounds a content, either protecting the content from external influences, or protecting the environment from the content.
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
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 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
Overpressure
Overpressure refers to an increase in pressure in a system or vessel above the normal operating pressure.
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
Device
A device is a pipe component that influences the media flow by opening, closing, or partially shutting off the flow channel or by dividing or mixing the media flow.
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
Vacuum
Vacuum is the pressure in an enclosed space that is lower than the ambient pressure.
(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
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 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
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.
.
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 and Features
Dimensions
To select the nominal size Nominal size The nominal size is an alphanumeric designation of size for components in a piping system, used for reference purposes, comprising the letters DN followed by a dimensionless integer that is indirectly related to the physical size of the bore or outside diameter of the connections, expessed in millimeters. (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 Valve seat The valve seat is a component on which the valve pallet rests when the valve is closed. | 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
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 designVD/KSM
Additional special devices available upon request.
Settings
| Pressure: | +6.0 mbar | +100 mbar |
| +2.4 inch W.C. | +40 inch W.C. | |
| +4.0 mbar | +100 mbar | |
| +1.6 inch W.C. | +40 inch W.C. | |
| +4.5 mbar | +100 mbar | |
| +1.8 inch W.C. | +40 inch W.C. | |
| Vacuum: | -6.0 mbar | -100 mbar |
| -2.4 inch W.C. | -40 inch W.C. | |
| -4.0 mbar | -100 mbar | |
| -1.6 inch W.C. | -40 inch W.C. | |
| -4.5 mbar | -100 mbar | |
| -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”.
Applications