UB/SF-IIA1
Pressure/Vacuum Diaphragm Valve with internal coating, deflagration- and endurance burning-proof
Features
Function and Description
Combined Pressure and Vacuum Relief Valve
The Deflagration Deflagration Explosion propagating at subsonic velocity. -Proof and Endurance-Burning-Proof PROTEGO® UB/SF-IIA1 type diaphragm Diaphragm A diaphragm is a thin layer of material, which has a large surface area. valve is a state of the art pressure Pressure (gauge pressure) Pressure for which the value is equal to the algebraic difference between the absolute pressure and the atmospheric pressure. and vacuum Vacuum Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. - relief valve combining the function of a dynamic Flame Arrester Flame arrester Device fitted to the opening of an enclosure, or to the connecting pipe work of a system of enclosures, and whose intended function is to allow flow but prevent the transmission of a flame. . Worldwide this design is unique. It is primarily used within biogas plants as a 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. for flame transmission proof in- and outbreathing on tanks, containers and process engineering apparatus. The valve offers reliable protection against excess pressure and vacuum, prevents the inbreathing of air and product Product Includes equipment, protective systems, devices, components and combinations of these. losses almost up to the 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. and protects against atmospheric deflagration and endurance burning Endurance burning Stabilized burning for an unlimited time. if stabilized burning Stabilized burning Steady burning of a flame stabilized at, or close to the flame arrester element. occurs.
Usable Under Extreme Climatic Conditions
The set pressure is adjusted with a freeze resistant water glycol mixture, which assures safe operation under extreme cold weather conditions. The liquid is capsuled and is not discharged or diluted during operation. The valve can also be operated at temperatures lower than 0°C without ice constricting the function of the valve.
Composition
When the pressure in the tank reaches the set pressure, the FPM-diaphragm (1) on the outer valve seat Valve seat The valve seat is a component on which the valve pallet rests when the valve is closed. ring (2) is lifted and vapours vent to the environment. The set pressure is adjusted by the liquid (glycol water mixture) column height, which is filled into the outer ring chamber (3). The overpressure Overpressure Overpressure refers to an increase in pressure in a system or vessel above the normal operating pressure. chamber is equipped with an opening (4) to keep the pressure in balance with the ambient pressure. If a vacuum builds up in the tank, it is transmitted through pressure balancing tubes into the vacuum chamber (5) (inner chamber). If the set vacuum Set vacuum Internal negative gauge pressure at which a vacuum valve first opens. , which depends on the liquid column height in the vacuum chamber, is reached the atmospheric pressure lifts the diaphragm up off the inner valve seat ring (6). Ambient air Ambient air Normal atmosphere surrounding the equipment and protection system. can now flow into the tank. The liquid column heights, which affect the set pressures and vacuum, can be checked by floating level indicators (7).
Advanced Sealing Technology for Reliable Pressure Maintenance in Tanks
The tank pressure Tank pressure Tank pressure is the pressure within a tank. is maintained up to the set pressure with a tightness that is far superior to the conventional standard due to our highly developed manufacturing technology. This is achieved because the liquid loaded diaphragm presses tightly around the special designed valve seat surface area, even when the operating pressure Operating pressure Operating pressure is the pressure existing at normal operating conditions within the system being protected. increases. This is extremely important to reduce leakage to an absolute minimum. After the excess pressure or vacuum is discharged, the valve reseats 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. .
Dynamic Flame Arresting Safety at Overpressure Conditions
If the tank pressure exceeds the adjusted set pressure Adjusted set pressure Adjusted set pressure is the pressure at which a valve opens on a test bench. , as the case may be explosive gas/product-vapour air mixtures exit. The speed at which these mixtures exit the annular gap between the diaphragm and the outer valve seat ring while overcoming the set pressure is much faster than the flame speed. If this mixture ignites, flashback Flashback Phenomenon occurring in a flammable mixture of air and gas when the local velocity of the combustible mixture becomes less than the flame velocity, causing the flame to travel back to the point of mixture. into the tank is prevented. If the mixture flow continues, the dynamic flame arresting feature prevents flashback ignition even in the case of endurance burning.
Many Individual Certifications
Even at relatively low flow rates, which occur during thermal outbreathing, the gap formed by the volumetric flow is so narrow that flames are extinguished in the gap and flashback is prevented. The PROTEGO® UB/SF-IIA1 valve is available for substances of explosion Explosion Abrupt oxidation or decomposition reaction producing an increase in temperature, pressure, or in both simultaneously. group IIA1 - methane. The valve can be used up to an operating temperature Operating temperature Temperature reached when the equipment is operating under design conditions. of +60°C / 140°F and an operating pressure up to ≥3.5 mbar / 1.4 inch W.C. and meets the requirements of European Tank Design Standard EN 14015 – Appendix L and API 2000 EU conformity according to the currently valid ATEX directive. Approvals according to other national/international regulations on request.
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), please use the flow capacity charts on the following pages
| DN | pressure | pressure | 80 / 3" | pressure | pressure | 100 / 4" | pressure | pressure | 150 / 6" |
| a | up to +28 mbar | up to +11.2 inch W.C. | 615 / 24.21 | up to +28 mbar | up to +11.2 inch W.C. | 645 / 25.39 | up to +25 mbar | up to +10 inch W.C. | 680 / 26.77 |
| a | > +28 mbar | > +11.2 inch W.C. | 765 / 30.12 | > +28 mbar | > +11.2 inch W.C. | 795 / 31.30 | > +25 mbar | > +10 inch W.C. | 830 / 32.68 |
| b | 410 / 16.14 | 485 / 19.09 | 590 / 23.23 |
Dimensions in mm / inches
Pressure settings > +50 mbar / +20 inch W.C. (DN 80), > +45 mbar / +18 inch W.C. (DN 100), > +46 mbar / +18.4 inch W.C. (DN150) with additional liquid reservoir - dimensions upon request
Dimensions for pressure/vacuum diaphragm valves with
heating coil
Heating coil
A heating coil is a pipe connection consisting of several pipe sections.
upon request
Material for housing
| Design | B |
| 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. | Steel |
| Coating Coating Coating is the application of a firmly adhering layer of shapeless material to the surface of a workpiece. of housing | 2 components polymere coating |
| Valve top | Stainless Steel |
| Heating coil (UB / SF-H-...-I) | Stainless Steel |
| Valve seats | Stainless Steel |
| Gasket | FPM |
| Diaphragm | FPM |
Special materials upon request
Selection of explosion group
| MESG | Expl. Gr. (IEC / CEN) |
| ≥ 1,14 mm | IIA1 |
Special approvals upon request
Flange connection type
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
other types upon request
Design Types and Specifications
Almost any combination of vacuum and pressure settings can be utilized for the valve. The diaphragm is pressurized by liquid. Higher pressures can be achieved upon request with a special liquid reservoir.Settings:
| DN 80 | +3.5 mbar | +50 mbar |
| +1.4 inch W.C. | +20 inch W.C. | |
| DN 100 | +3.5 mbar | +45 mbar |
| +1.4 inch W.C. | +18 inch W.C. | |
| DN 150 | +3.5 mbar | +46 mbar |
| +1.4 inch W.C. | +18.4 inch W.C. | |
| Vacuum | -3.5 mbar | -35 mbar |
| -1.4 inch W.C. | -14 inch W.C. |
Higher pressure settings up to +150 mbar (60 inch W.C.) in special design with additional liquid reservoir upon request.
Flow Capacity Chart
UB/SF DN80
UB/SF DN100
UB/SF DN150
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”.
