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The Type 3500 relief/safety relief valve is designed to have a short ‘simmer’, then to open rapidly to the full open position, and to re-seat at a controlled pressure. When the valve is in its fully lifted position, the discharge area is controlled by the bore of the nozzle, which ensures that flow calculations for various mediums can be reliably made.

Valves are supplied in sizes 1” x 2” to 8” x 10”, orifices 'D' through to 'T' and can be manufactured in Cast Steel, Stainless Steel and many other materials to suit the application, with flanges to customers requirements.

Valves can also be supplied with a packed lever or open lever lifting device, limit switch to indicate opening and closing of the valve, governing ring to limit adjustment of the spring to the set point, for ease of re-setting, balanced bellows when there is a variable back pressure.

Below is a brief summary of our Type 3500 Safety Relief Valve. 


1" x 2" up to 8" x 10"

Design Standards

ASME Section VIII Division 1 (Latest Ed.)

API 520 (Latest Ed.)

API 526 (Latest Ed.)


In accordance with ASME B16.5, DIN EN 1092-1 or JIS 2220

(Other standards/options available upon request)


Carbon Steel, Stainless Steel, Duplex, Super Duplex, Inconel and more

Orifice Designations

API orifice designations from 'D' to 'T'

Set Pressure

0.34 Barg to 425 Barg


Gas, liquid and vapour applications

Further information for this valve can be found in the Type 3500 Safety Relief Valve technical datasheet.

Technical datasheets for all of our other valves can be found on the Technical section of our website.

If further assistance is required please contact our sales team on +44 (0)1482 619601 or email

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