Spring-Loaded Safety Relief Valve 1900 Series
Series 1900 safety relief valves are designed for use with gaseous and liquid fluids, as well as steam. All internal valve components are made of stainless steel. The high reliability of the design is confirmed by many years of successful operation.
Technical specifications
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Type spring-loaded
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Nominal diameter Inlet DN 25…300 mm Outlet 50…400 mm
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Nominal pressure Inlet ANSI class 150 to 2500 (PN 2,0 ÷ 42 MPa) Outlet ANSI class 150 to 600 (PN 2,0 ÷ 10 MPa)
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Operating temperature - 267 to 815 °C
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Set pressure 0,035 to 42 MPa
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Flow area 16 sizes from 0,71 to 509,65 cm²
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Material of construction carbon steel / stainless steel / cold-resistant carbon steel / special steels and alloys
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Leakage test API 527
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Type of connection flanged
Execution options
With a balanced bellows
Balanced bellows design (with auxiliary balanced piston)
With a lifting lever
Packed or open lifting lever
Cap with a test gag
With a test gag to hold the safety relief valve closed during hydrostatic test
With soft seat
Soft seat design (seat tightness at an operating pressure equal to 95% of the set pressure)
Thermodisc
Special design of the disc for steam service – Thermodisk
With a bellows stem seal
Designed for applications with increased requirements for tightness and safety. Tightness is achieved through a metal bellows, which completely prevents the working medium from escaping into the atmosphere, even during prolonged operation. The bellows operates under external pressure and is protected by guide bushes, ensuring resistance to vibrations and pressure fluctuations. This design is optimal for toxic, explosive, and vacuum services where leakage is unacceptable, and guarantees durability, reliability, and maintenance-free operation of the packing assembly.
With a steam jacket heating
To maintain the temperature of the working medium inside the valve. The steam jacket ensures uniform heating of the body, preventing thickening or crystallization of viscous or temperature-sensitive fluids, and also reduces the risk of condensate formation. It is used in systems with high medium viscosity or in low-temperature environments.
Features
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Trim made of stainless steelTrim made of stainless steel in standard design
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Eductor tubeEductor tube for removing the working fluid from the spring area