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An angled valve body with a spring above it.
Also known as: Safety relief valve symbol, PSV symbol, Pressure relief device symbol
On a piping diagram a pressure safety valve is drawn as an angled body with a spring, opening automatically to relieve pressure above a set point and protect the equipment.
Denotes a valve that opens automatically at a set pressure to protect equipment from overpressure.
Contexts: Technical drawing
Is a protective device rather than a control element, and its set pressure is a safety parameter recorded on the drawing rather than an operating adjustment.
Contexts: Technical drawing
An angled valve body with an inlet below and an outlet to the side, with a zigzag spring drawn above the closure.