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Emergency Relieving Manway

Emergency Manway

The B400 Series ensures that tanks and vessels are kept safe during periods of excessive pressure due to external fire sources and also allows access to the tank for inspection / cleaning purposes.

Available as Emergency Pressure Only and Emergency Pressure and Vaccume Relief.

Standard Pressure settings + 4 mbarg to 140 mbarg

Standard Vacuum settings -2 mbarg to – 50 mbarg

Pressure Only Size Range  range 8″ ( 200 mm) – 36″ ( 900 mm )

Pressure with Vacuum Relief Size range 18" (450mm) - 36" (900 mm)

Standard body materials – Aluminium, Carbon steel, Stainless steel

Standard trim material – Stainless steel

Diaphragm material – PTFE

Flanges – Drilled only API / ANSI / DIN / JIS / Specials

Hinged cover ensures automatic re seat

Steam Jackets available

Proximity Switches to indicate pallet lift

Alternative materials for hazardous applications

Non standard applications consult factory


Low cost maintenance
Lightweight design provides easy handling whilst interchangeable components ensure standard parts
are easily replaced

Testing / Quality
All products are factory tested and fully certified.

Self Draining
All products are designed so that any condensate drains away from seating areas.

Low leakage
Standard seating design ensures minimum leakage of less than 1 scfh at 90% of set pressure.

Internal Parts
Internal parts are stainless steel as standard. Non standard materials available upon request.

All valves are supplied with drilled flanges to meet individual requirements.

Non Standard Applications
There are numerous options available for special applications. Exotic materials such as Hastelloy and
various plastics can be offered to suit the most hazardous of environments. Special coatings can be
applied for extreme service. For low temperature duties, internal parts can be PTFE coated to prevent


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