Spring loaded safety relief valve or direct-acting spring valves is a self-actuated spring-loaded pressure relief valve which is designed to open at a predetermined pressure and protect a vessel or system from excess pressure by removing or relieving fluid from that vessel or system.

This type of safety valve meet all the requirement of ASME SECIII, API 520, API 521, API 526 such as orifice area, sizing procedure, dimension, pressure rate, flange connection size.