VD/TS

VD/TS

Pressure/Vacuum Relief Valve
atmospheric deflagration-proof

Function and Description

The atmospheric deflagration-proof VD/TS type PROTEGO® valve is a highly developed combined pressure/vacuum relief valve for high flow capacities with an integrated flame arrester unit. It is primarily used as a safety device 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 losses almost up to the set pressure and also protects against atmospheric deflagration. The PROTEGO® flame arrester unit is designed to achieve minimum pressure drop with maximum safety. The PROTEGO® VD/TS device is available for substances from explosion groups IIA to IIB3 (NEC group D to C MESG ≥ 0.65 mm).

When the set pressure is reached, the valve starts to open and reaches full lift within 10% overpressure. This unique 10% technology enables a set pressure that is only 10% below the maximum allowable working pressure (MAWP) or maximum allowable working vacuum (MAWV) of the tank. After years of development, this typical opening characteristic of a safety relief valve is now also available for the low pressure range.

The tank pressure is maintained up to the set pressure with a tightness that is far superior to the conventional standard due to our state of the art manufacturing technology. This feature is ensured by the valve seats made of high quality stainless steel and with individually lapped valve pallets (1) or with an air cushion seal (2) in conjunction with high quality FEP diaphragm. The valve pallets are also available with a PTFE seal to prevent the valve pallets from sticking when sticky products are used and to enable the use of corrosive fluids. After the excess pressure is discharged, the valve reseats and provides a tight seal.

If the set pressure is exceeded, explosive gas/product-vapour air mixtures are released to the atmosphere. If this mixture ignites, the integrated PROTEGO® flame arrester unit (3) prevents flame transmission into the tank.

The standard design is tested at an operating temperature up to +60°C / 140°F and meets the requirements of European tank design standard EN 14015 – Appendix L and ISO 28300 (API 2000). In addition numerous versions for higher operating temperature are available.

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

Features and Advantages

  • requires only 10% overpressure to full lift
  • extreme tightness and hence least possible product losses and reduced environmental pollution
  • through 10% technology higher set pressures can be used which results in product loss reduction compared to conventional 40% and 100% overpressure technology vents (compare API 2000)
  • the valve disc is guided within the housing to protect against harsh weather conditions
  • can be used as protective system according ATEX in areas subject to explosion hazards
  • FLAMEFILTER® provides protection against atmospheric deflagration
  • FLAMEFILTER® integrated into the valve saves space and reduces cost
  • FLAMEFILTER® protected from clogging through product vapour
  • PROTEGO® flame arrester unit has low pressure drop
  • optimized flow performance
  • maintenance friendly design
  • sturdy housing design
  • superior technology for API tanks
VD/TS
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Design Types and Specifications

Any combination of vacuum and pressure levels can be set for the valve
The valve discs are weight-loaded.

Pressure/vacuum relief valve, basic design

VD/TS

Pressure/vacuum relief valve, basic design

VD/TS

Additional special devices available upon request

Settings

Pressure:

+3.5 mbar +50 mbar
+1.4 inch W.C. +20 inch W.C.

Vacuum:

-2.0 mbar -25 mbar
-0.8 inch W.C. -10 inch W.C.
Higher and lower settings upon request
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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”.

VD/TS
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