We provide our customers with a friendly, experienced point of contact to source Birkett WB Series Safety Relief Valves. We have a broad range of capabilities and bring a wealth of experience and additional value. This means we can supply spare parts or complete products with competitive pricing and delivery. Please complete the form at the bottom of this page or send your RFQ to baileybirkett@chaseint.co.uk.
Bailey produce a wide range of dependable pressure reducing valves. They independently and without intervention monitor the supply pressure and automatically deliver a consistent reduced pressure for the operator.
CHASE has supplied Bailey Birkett safety valves for many years. We have a close working relationship with Bailey Birkett manufacturers, Emerson.
Birkett manufacture a comprehensive range of high performance pilot operated safety valves and spring loaded safety relief valves. They protect plant and equipment by relieving excess pressure.
BIRKETT WB SERIES SAFETY RELIEF VALVES
Spring loaded safety relief valves with a full lift and full nozzle to relieve excess pressure safely in a variety of process vessels.

Birkett has designed the WB Series to relieve excess pressure safely in pumps, pipe work, tanks, calorifiers, gas and oil separators and other process vessels. Models are available for gas, steam, vapor and liquid applications.
- Full nozzle, full lift provides high discharge coefficients and high capacities.
- Broad selection of valve types: conventional or bellows for gas or liquid service enables optimum valve selection.
- Wide range of materials provides solutions for any application.
- Lightweight construction reduces handling and shipping costs and benefits
offshore service. - Seat leakage integrity minimizes fugitive emissions.
- Interchangeable parts enable simple modification from gas to liquid and
conventional to bellows. - In-situ testing capability reduces maintenance costs.
- Reduced number of parts minimizes inventory and reduces maintenance costs.
- Valves conform to API 526 pressure/temperature ranges, orifice areas
and dimensions. - Extensive accessory range enables valves to be adapted to meet specific code and
application requirements. - Optional cleaning for cryogenic and oxygen services available.
Model Options
The WB Series is available in four different valve types to suit differing service requirements:
- WB400 – conventional gas type.
- WB300 – bellows gas type.
- WB200 – conventional liquid type.
- WB100 – bellows liquid type.
Conventional Safety Relief Valves
These valves can be used on systems where the discharge is relatively simple. The pressure in the discharge system can be atmospheric, at a constant level or where it may build up to a maximum of 10% of the set pressure. When a constant back pressure exists, the valve should be set at the differential pressure.
Bellows Safety Relief Valves
WB Series bellows valves are statically balanced and can be used on more complex discharge systems such as common discharge manifolds and flares where several valves may discharge. These types of system create a variable superimposed back pressure. The balanced bellows unit cancels out the effects of variable back pressure on the valve’s set pressure.