UB/DF

UB/DF

Pressure Diaphragm Valve

deflagration- and endurance burning-proof

Función y Descripción

The deflagration- and endurance burning-proof UB/DF type PROTEGO® diaphragm valve is a state-of-the-art pressurerelief valve combining the function of a dynamic and static flame arrester. Worldwide this design is unique. It is primarily used as a safety device for flame transmission proof out breathing on tanks, containers and process engineering apparatus. The valve offers reliable protection against excess pressure prevents the inbreathing of air and product losses almost up to the set pressure and protects against atmospheric deflagration and endurance burning if stabilized burning occurs. The PROTEGO® UB/DF diaphragm valve has proven its performance over many years in a great variety of severe applications in the petrochemical and chemical industry. The set pressure is adjusted with a freeze resistant water-glycol mixture, which assures safe operation under extreme cold weather conditions. The PROTEGO® UB/DF valve is available for substances of explosion group IIB3 (NEC group C MESG ≥ 0.65 mm).

When the pressure in the tank reaches the set pressure, the diaphragm (1) on the outer valve seat ring (2) is lifted and vapors vent to the environment. The set pressure is adjusted by the liquid (water-glycol mixture) column height, which is filled into the outer ring chamber (3). The overpressure chamber is equipped with an opening (4) to keep the pressure in balance with the ambient pressure. The opening is equipped with a FLAMEFILTER® to avoid flame transmission into the overpressure chamber. Ambient air can now flow into the tank. The liquid column height which affect the set pressures is checked by a floating level indicator (5).

The tank pressure 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 increases. This is extremely important to reduce leakage to an absolute minimum. After the excess pressure is discharged, the valve reseats and provides a tight seal.

If the tank pressure exceeds the adjusted set pressure, 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 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. 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. 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 so that flashback could result. The ignition into the tank can be prevented by installing the PROTEGO® flame arrester unit (8). This flame arrester unit provides additional protection against atmospheric deflagration during regular maintenance and inspection.

The valve can be used up to an operating temperature of +60°C / 140°F and meets the requirements of European tank design standard EN 14015 – Appendix L and ISO 28300 (API 2000).

Type-approved in accordance with the current ATEX Directive and EN ISO 16852 as well as other international standards.

Características especiales y ventajas

  • high performance seal reducing product loss below EPA’s 500ppm rule preventing environmental pollution
  • set pressure close to opening pressure enables optimum pressure maintenance in the system
  • high flow capacity
  • can be used as a protective system according to ATEX  in areas subject to an explosion hazard
  • protection against atmospheric deflagrations and endurance burning for products up to explosion group IIB3 (NEC group C ≥ 0.65 mm MESG)
  • minimum pressure drop of the FLAMEFILTER®
  • flame-transmission-proof pressure and vacuum chambers
  • freeze protection at sub-zero conditions
  • self draining function for condensate
  • liquid column height is monitored by level indicators
  • easy maintenance through hinged vent cap
  • modular design enables individual FLAMEFILTER® discs and valve diaphragm to be replaced
  • particularly suitable for problematic products such as styrene, acrylics, etc.

Dimensiones

To select the nominal size (DN), please use the flow capacity charts on the following pages

DNpressure pressure 80 / 3"100 / 4" 150 / 6"
aup to +28 mbarup to +11.2 inch W.C.615 / 24.21645 / 25.39680 / 26.77
a> +28 mbar> +11.2 inch W.C.765 / 30.12795 / 31.30830 / 32.68
b410 / 16.14485 / 19.09590 / 23.23
DNpressure pressure 80 / 3"100 / 4" 150 / 6"
aup to +28 mbarup to +11.2 inch W.C.615 / 24.21645 / 25.39680 / 26.77
a> +28 mbar> +11.2 inch W.C.765 / 30.12795 / 31.30830 / 32.68
b410 / 16.14485 / 19.09590 / 23.23

Dimensiones en mm / pulgadas

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

UB/DF

Selección de materiales para la vivienda

Design BCD
HousingCast IronSteelStainless Steel
Valve topStainless SteelStainless SteelStainless Steel
Heating coil (UB / DF-H-...)Stainless SteelStainless SteelStainless Steel
Valve seatStainless SteelStainless SteelStainless Steel
GasketFPMFPMPTFE
DiaphragmA, BA, BA, B
Flame arrester unitACC
Design BCD
HousingCast IronSteelStainless Steel
Valve topStainless SteelStainless SteelStainless Steel
Heating coil (UB / DF-H-...)Stainless SteelStainless SteelStainless Steel
Valve seatStainless SteelStainless SteelStainless Steel
GasketFPMFPMPTFE
DiaphragmA, BA, BA, B
Flame arrester unitACC

Option: Housing with ECTFE-lining

Special materials upon request

Selección de materiales

DesignAB
DiaphragmFPMFEP
DesignAB
DiaphragmFPMFEP

Special materials upon request

Combinación de materiales para la unidad apagallamas

Design  AC
FLAMEFILTER® cageCast IronStainless Steel
FLAMEFILTER®Stainless SteelStainless Steel
SpacerStainless SteelStainless Steel
Design  AC
FLAMEFILTER® cageCast IronStainless Steel
FLAMEFILTER®Stainless SteelStainless Steel
SpacerStainless SteelStainless Steel

Special materials upon request

UB/DF

Selección del grupo de explosión

MESGExpl. Gr. (IEC / CEN)Gas Group (NEC)
≥ 0,65 mmIIB3C
MESGExpl. Gr. (IEC / CEN)Gas Group (NEC)
≥ 0,65 mmIIB3C

Special approvals upon request

Tipo de bridas de conexión

EN 1092-1; Form B1
ASME B16.5; 150 lbs RFSF
EN 1092-1; Form B1
ASME B16.5; 150 lbs RFSF

other types upon request

Modelo y especificación

The diaphragm is pressurized by liquid. Higher pressures can be achieved upon request with a special liquid reservoir.
There are two different designs:

Pressure diaphragm valve, basic design

UB/DF - –

Pressure diaphragm valve with heating coil (max. heating fluid temperature +85°C / 185°F)

UB/DF - H

Pressure diaphragm valve, basic design

UB/DF - –

Pressure diaphragm valve with heating coil (max. heating fluid temperature +85°C / 185°F)

UB/DF - H

In addition to the standard design, a series of specially developed designs, which are particularly suitable for operating conditions to which these products are subjected, can be provided upon request (for example, for acrylics or styrene storage tanks, etc.).

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.

Higher pressure settings up to +140 mbar (56.2 inch W.C.) in special design with additional liquid reservoir as well as lower pressure settings upon request.

UB/DF

Diagrama de flujo volumétrico

Los diagramas de flujo volumétrico han sido determinados con un banco de pruebas de caudal calibrado y certifi - cado por TÜV. El flujo volumétrico V. en [m³/h] y el CFH se refi eren a las condiciones estándar de referencia de aire según ISO 6358 (20°C, 1bar). La conversión a otras densidades y temperaturas están referidas en el Vol. 1: “Fundamentos Técnicos”.

UB/DF
UB/DF