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SAFETY VALVES - LESER

SAFETY VALVESBASIC KNOWLEDGEP rotection against primary purpose of a SAFETY valve is the pro-tection of life, property and environment. A safe-ty valve is designed to open and relieve excess pressure from vessels or equipment and to reclose and prevent the further release of fluid after normal conditions have been restored. P. 04P. 06P. 08 REASONS FOR EXCESS pressure IN A VESSELSPRING LOADED SAFETY VALVESPILOT-OPERATED SAFETY VALVESCONTENTS1. 2. 3. - 4 -- 5 -There is a number of reasons why the pressure in a vessel or system can exceed a predetermined lim-it. API Standard 521/ISO 23251 Sect. 4 provides a detailed guideline about causes of overpressure. The most common are: Blocked discharge Exposure to external fire, often referred to as Fire Case Thermal expansion Chemical reaction Heat exchanger tube rupture Cooling system failureEach of the above listed events may occur individ-ually and separately from the other.

spring force is greater than the force Fp generated by the pressure at the valve inlet. SPRING LOADED 2. SAFETY VALVES Valve closed In a direct spring loaded safety valve the closing force or spring force is applied by a helical spring which is compressed by an adjusting screw. The spring force is transferred via the spindle onto the disc.

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