Breather Valve Products

3B Controls Ltd manufacture and supply low pressure and vacuum relief valves, breather valves, emergency vents, manways, Gas Blanketing valves, gauge hatches, free vents, rim vents, flame arresters and Pilot Operated relief valves, plus associated breather valve spare parts. We also manufacture, supply and service for the biogas industry.

Our breather valves are designed to protect bulk liquid storage tanks from excessive pressure and vacuum. The name relates to the fact that these valves are specifically designed to protect tanks – allowing them to breathe and preventing rupturing or imploding.The valves can be weight-loaded or spring-loaded and are available in various configurations.

Breather valve and PV valve export

Our breather valves are exported throughout the world, deliveries offered to suit our customers varying requirements. For urgent orders, we can despatch in days rather than weeks. Valves are manufactured in a variety of materials aluminium, carbon steel, stainless steel, plastics, hastelloy and specialist coatings.

Steam jackets, proximity switches and cold weather service are some of the options available to our range of equipment.

Spares and support

All products supplied by us can benefit from our excellent support services,  delivered by our  fully trained team of Service Engineers. We offer spare parts for breather valves, Whessoe valves etc and digester valves.

What industries do we serve?

Wherever there is a demand for bulk liquid storage there will be a requirement for our products. For example, Fuel storage, chemical production, Pharmaceuticals, food & drink, and Renewable energy (Biogas).

pressure relief valves

Pressure Relief Valves

The Valves ensure that tanks and vessels are kept safe during periods of excessive pressure and / or vacuum caused by filling and emptying of product and changes in temperature due to climatic or external fire sources.

b400 emergency relief manway

Emergency Relief

The valves ensure 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.

b500 hatch

Gauge Hatches and Vents

Gauge Hatches and Vents are designed to provide access to tanks and vessels for sampling, measurement and inspection whilst also allowing for free venting to atmosphere if required.

model 933s flame arrester

Flame Arresters

Specialised Flame Arresters designed to prevent the passage of flames in storage vessels and pipelines carrying flammable gases and vapours.

nitrogen blanketing valve

Gas Blanketing

Specifically designed to allow full gas blanket pressure supply pressure directly to the tank or vessel, reducing blanketing gas losses to a minimum.

biogas cover equipment


Specialised range of Biogas safety equipment, used in sewage treatment, landfills, food processing plants etc where anaerobic digestion is used for solid waste treatment.