UB/SF-G
Pressure/Vacuum Diaphragm Valve deflagration- and endurance burning-proof
Features
Suitable for Challenging Applications
Particularly Suitable for Problematic Products Such as Styrene, Acrylates, etc.
Safety Against Endurance Burning
Protection against Atmospheric Deflagration and Endurance Burning
Extreme Tightness
Resulting in Lowest Possible Product Losses and Reduced Environmental Pollution
Digital Level Monitoring
Digital Level Monitoring Available to Optimize Maintenance Intervals
Digital Level Sensors
Digital Level Sensors Can Be Retrofitted to Installed Valves
Safe Venting
Flame Arrester Venting and Ventilation of the Pressurized Chamber
Frost-Proof
Optimal Frost Protection
Condensate Drainage
Automatic Condensate Drain
Monitoring
Monitoring of the Load Liquid by Level Indicator
Modular Design
Allows Replacement and Cleaning of Single FLAMEFILTER®
Easy Operation Monitoring
and Maintenance by Simply Opening the Hinged Valve Cap
Protective System According to ATEX
can Be Used as a Protective System in Areas With Potentially Explosive Atmosphere in Accordance With ATEX
Optimal Pressure Maintenance
Set Pressure Close to Opening Pressure for Optimum Pressure Maintenance in the System
Function and Description
Combined Pressure and Vacuum Relief Valve
The PROTEGO® UB/SF-G diaphragm valve is the only deflagration-proof and endurance burning-proof valve of its kind in the world. It is a highly developed combined pressure and vacuum valve with dynamic and static Flame Arresters. It is primarily used as a safety device for flame transmission-proof in-breathing and out-breathing of tanks, containers, and process equipment. The valve provides reliable protection against overpressure and vacuum, prevents the in-breathing of air and product losses almost up to the set pressure, and protects against atmospheric deflagration and endurance burning if stabilized burning occurs.
High Operational Reliability in Extreme Conditions
The PROTEGO® UB/SF-G diaphragm valve has proven itself over many years under a wide variety of operating conditions in the mineral oil and chemical industries. Worldwide, it is the only vent which works reliably with problem products such as styrene or acrylates. The set pressure is adjusted with a freeze resistant water-glycol mixture which ensures safe operation under extreme cold weather conditions. The Valve Type PROTEGO® UB/SF-G is used for those operating conditions, when heated product vapours condensate due to low ambient temperatures within the vacuum chamber (5) connected to the tank room. This would dilute the liquid load of the standard design type PROTEGO® UB/SF, whereas PROTEGO® UB/SF-G allows the condensate to flow back into the tank via punched diaphragm.
For Explosion Group IIB3
The PROTEGO® UB/SF-G valve is available for substances up to explosion group IIB3.
When the pressure in the tank reaches the set pressure, the diaphragm (1) on the outer valve seat ring (2) is lifted and vapors are released into the environment. The set pressure is adjusted by weight of the liquid load (water-glycol mixture) in the outer ring chamber (3). The overpressure chamber is equipped with an opening (4) to keep the pressure in balance. The opening is equipped with a FLAMEFILTER® to prevent flame transmission into the overpressure chamber. The overpressure is adjusted via the filling level of the load liquid in the chamber and can be checked by a floating level indicator (7).
Composition
If there is vacuum within the tank, the pressure part of the diaphragm (9) is pressed on the valve seat (2) by the liquid load as well as by the atmospherical pressure within the pressure valve chamber, which provides additional sealing. If the tank vacuum, which exists also in the valve chamber (5) because of the holes in the diaphragm part (6), exceeds the valve set pressure, the vacuum part of the diaphragm (10) lifts up due to the external atmospheric pressure, which exists in the valve internal and air flows into the tank.
Advanced Sealing Technology and Dynamic Flame Arresting in Overpressure Relief Valve
If the set pressure is exceeded, explosive gas/air or product vapor/air mixtures are released into the atmosphere. The speed at which these mixtures exit the annular gap between the diaphragm and the outer valve seat ring is considerably greater than the flame speed. If this mixture ignites, flashback into the tank is prevented. If the mixture flow continues, the dynamic flame arresting feature prevents a flashback, even in case of endurance burning. Even at relatively low flow rates, e.g., during thermal out-breathing, the gap formed by the volumetric flow is so narrow, that flames in the gap are extinguished and a flashback is prevented.
Main Component – PROTEGO® Flame Arrester Unit
At very low pressure settings, the explosion pressures resulting from an atmospheric deflagration may be strong enough to lift the diaphragm off the valve seat rings. The ignition into the tank can be prevented by installing the PROTEGO® Flame Arrester Unit (8). This PROTEGO® Flame Arrester Unit provides additional protection against atmospheric deflagration when the valve is open for maintenance and inspection.
Many Individual Certifications
The valve can be used at an operating temperature of up to +60°C / 140°F and meets the requirements of European Tank Design Standard EN 14015 (Appendix L) and ISO 28300 (API 2000).
EU conformity according to the currently valid ATEX directive. Approvals according to other national/international regulations on request.
Product Data
Dimensions
To select the nominal size (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 80/3”), > +45 mbar / +18 inch W.C. (DN 100/4”), > +46 mbar / +18.4 inch W.C. (DN150/6”) with additional liquid reservoir - dimensions upon request
Dimensions for pressure/vacuum diaphragm valves with heating coil upon request
Selection of explosion group
| MESG | Expl. Gr. (IEC / CEN) | Gas Group (NEC) |
| ≥ 0,65 mm | IIB3 | C |
Special approvals upon request
Material selection for housing
| Design | C | D |
| Housing | Steel | Stainless Steel |
| Valve top | Stainless Steel | Stainless Steel |
| Heating coil (UB / SF-H-...) | Stainless Steel | Stainless Steel |
| Valve seat | Stainless Steel | Stainless Steel |
| Gasket | FPM | PTFE |
| Diaphragm | A, B | A, B |
| Flame arrester unit | C | C |
Option: Housing with ECTFE-lining
Special materials upon request
Material selection
| Design | A | B |
| Diaphragm | FPM | FEP |
Special materials upon request
Material combinations of flame arrester unit
| Design | C |
| FLAMEFILTER® cage | Stainless Steel |
| FLAMEFILTER® | Stainless Steel |
| Spacer | Stainless Steel |
Special materials upon request
Flange connection type
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
other types upon request
Flow Capacity Chart
UB/SF-G DN100 pressure
UB/SF-G DN150 pressure
UB/SF-G DN80 vacuum
UB/SF-G DN100 vacuum
UB/SF-G DN150 vacuum
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”.
