API safety relief valves are critical pressure protection devices used across oil and gas, petrochemical, chemical, power generation, and industrial process applications. Designed to protect vessels, pipework, equipment, and personnel from excessive pressure, these valves automatically open when system pressure reaches a defined set point and safely discharge the excess pressure.
Selecting the correct API safety relief valve is essential for safe, reliable, and compliant operation. Key considerations include set pressure, inlet and outlet connection size, pressure rating, orifice size, valve material, service media, temperature, back pressure, and whether a conventional, balanced bellows, or pilot-operated design is required.
When replacing or specifying API safety relief valves, one of the most common questions is whether valves from different manufacturers share the same dimensions. In many cases, API 526 standard safety relief valves are designed around standardised flange sizes, pressure ratings, orifice designations, and centre-to-face dimensions, helping improve interchangeability across approved manufacturers.
However, not every valve described as an “API safety valve” is automatically a direct drop-in replacement. Overall height, bonnet design, lifting lever arrangement, accessories, weight, and maintenance clearances can vary between brands. That is why it is important to compare the valve datasheet and general arrangement drawing before ordering a replacement.
At Flowstar, we supply and support a wide range of API safety relief valves for gas, steam, vapour, and liquid applications. Whether you need a new valve, a direct replacement, or help identifying the correct API orifice and connection arrangement, our team can help you find a suitable valve for your process requirements.