UB/DF
Pressure Diaphragm Valve deflagration- and endurance burning-proof
Features
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
Flow Capacity
Optimized Flow Capacity
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®
Suitable for Challenging Applications
Particularly Suitable for Problematic Products Such as Styrene, Acrylates, etc.
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
Safety Against Endurance Burning
Protection against Atmospheric Deflagration and Endurance Burning
Function and Description
Highly Developed Pressure Relief Valve
The PROTEGO® UB/DF diaphragm valve is a worldwide unique deflagration-proof and endurance burning-proof pressure relief valve combining the function of a dynamic and static Flame Arrester. It is primarily used as a device for flame transmission-proof out-breathing on tanks, containers, and process equipment. The valve offers reliable protection against overpressure, 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.
For Explosion Group IIB3
The PROTEGO® UB/DF diaphragm valve has proven itself over many years under a wide variety of operating conditions in the mineral oil and chemical industries. The set pressure is adjusted with a freeze resistant water-glycol mixture which ensures safe operation under extreme cold weather conditions. The PROTEGO® UB/DF valve is available for substances from explosion group IIB3 (NEC group C MESG ≥ 0.65 mm).
Operation of the Overpressure Relief Valves
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 the 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 setting is determined by the filling level of the loading liquid and can be adjusted by a floating level indicator (5).
Overpressure Protection with Advanced Sealing Technology
The tank pressure is maintained up to the set pressure with a tightness that is above the normal standards due to our highly developed manufacturing technology. This is achieved by the liquid loaded diaphragm pressing tightly around the special designed valve seat surface area even when the operating pressure increases, which reduces surface pressure and unnecessary leakage. After the overpressure is released, the valve re-seats and provides a tight seal.
Dynamic Flame Arresting at Overpressure Conditions
If the set pressure is exceeded, explosive gas/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 flashback, even in the case of endurance burning.
Main Component – PROTEGO® Flame Arrester Unit
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. 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 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 | B | C | D |
| Housing | Cast Iron | Steel | Stainless Steel |
| Valve top | Stainless Steel | Stainless Steel | Stainless Steel |
| Heating coil (UB / DF-H-...) | Stainless Steel | Stainless Steel | Stainless Steel |
| Valve seat | Stainless Steel | Stainless Steel | Stainless Steel |
| Gasket | FPM | FPM | PTFE |
| Diaphragm | A, B | A, B | A, B |
| Flame arrester unit | A | 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 | A | C |
| FLAMEFILTER® cage | Cast Iron | Stainless Steel |
| FLAMEFILTER® | Stainless Steel | Stainless Steel |
| Spacer | Stainless Steel | 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/DF DN100 Pressure
UB/DF DN150 Pressure
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”.
