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Sampling and Air Bleed Valve deflagration proof

Function and Description

The PROTEGO® sampling and air bleed valve is used for flame transmission-proof venting of pipelines and equipment that transports or processes flammable liquids and for taking liquid samples. The valve incorporates an end-of-line deflagration flame arrester. Should the gas/air mixtures or product vapor/air mixtures ignite during venting, the valve prevents flash back into the protected system.

The sampling and air bleed valve PROTEGO® ZE/WU consists of the threaded angle valve in pressure stage PN25 (1) with hand wheel as standard design, a female threaded connection (pipe thread G½“up to G1“), and the flame arrester (2) with cover (3).

Optionally, an elbow fitting (4) is available as outlet for sampling. The PROTEGO® flame arrester (2) consists of the flame arrester casing with FLAMEFILTER®.

The valve opens manually with the hand wheel. For sampling, a suitable container is required.

The simple and sturdy design makes it suitable for nearly all flammable liquids. This device can be installed in any position.

Flame transmission protection is guaranteed against atmospheric deflagrations of gas/air mixtures or product vapor/air mixtures of explosion groups up to IIB IIB (NEC group D to C) up to an operating temperature of +60°C / 140°F and an absolute operating pressure of up to 1.1 bar / 15.9 psi.

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


DNabØ cdef
G½"40 / 1.57140 / 5.5170 / 2.7680 / 3.1596 / 3.7867 / 2.64
G¾"50 / 1.97165 / 6.5085 / 3.3580 / 3.1589 / 3.5067 / 2.64
G1"65 / 2.56200 / 7.87100 / 3.9495 / 3.74104 / 4.0967 / 2.64
Dimensions in mm / inches


Threaded angle valveStainless Steel
ElbowStainless Steel
CoverStainless Steel
FLAMEFILTER®Stainless Steel
The valves must be sufficiently resistant to corrosion through the gas/air mixtures or product vapour/air mixtures. This applies mailnly to the FLAMEFILTER®.

Explosion group

MESGExpl. Gr. (IEC / CEN)Gas Group (NEC)
≥ 0,50 mmIIBB

Type of connection

Pipe thread DIN ISO 228 T1DIN

Design Types and Specifications

There are two designs available:

Sampling and air bleed valve, standard design

Sampling and air bleed valve with elbow

ZE/WU - 1

Special designs for higher pressures are available

ZE/WU - 2

Optionally available with fl ange connection (see fi gure)