API · ASME · DIN · EN standard industrial valves
Safety Valves product range
Automatic pressure-relief devices protecting boilers, vessels and piping against overpressure, sized to API 520/521/526.
Last updated: 2026-10
Product family
Full Lift Safety Valves
Full lift safety valves pop wide open once set pressure is reached, dumping the full orifice area so accumulated pressure collapses fast on compressible or…
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Low Lift Safety Valves
Low lift safety valves open only a fraction of the seat diameter, releasing a measured slip of fluid along a seat face — the proportionate behaviour that suits…
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Steam Safety Valves
Steam safety valves guard boilers and steam headers, venting overpressure flashes before they can lift a vessel rating — sized on the inlet-by-outlet paired…
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Balanced Bellows Safety Valves
Balanced bellows safety valves hold set pressure stable where back pressure would derate a conventional spring-loaded relief valve: a bellows isolates the…
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Pilot-Operated Safety Valves
Pilot-operated safety valves pair a main valve with an external pilot: the pilot senses line pressure and controls the main valve, giving full lift at set…
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Documents
Ask for the documentation set with the inquiry — typical items (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
Send the medium, temperature, pressure, size and connection for a quotation-ready inquiry. Lead time, MOQ and price are confirmed at quotation, together with the documents to be supplied with the order.
Sample & supply
Supply terms, order quantities and lead time are agreed per order — state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, and keep end-face protectors on until installation; storage limits and shipping arrangements for the selected materials are confirmed at quotation.
Knowledge: selection guides
Frequently asked questions
What standards govern the design and testing of safety valves?
The published specification for this family lists API 520, API 521, API 526 as the design standards. Testing follows API 527, ASME PTC 25.3, API 598, DIN 3230.
What sizes and pressure ratings are available for safety valves?
The published size range is 1/2 x 1/2 inch to 12 x 14 inches, depending on model, and the published pressure ratings are PN16 to PN100, Class 150 to Class 600. Availability of a specific size and rating is confirmed at quotation.
What materials are safety valves available in?
The published specification lists body materials: Cast iron, Ductile iron, WCB, SS304, SS316. Material availability for a specific size and rating is confirmed at quotation.
What end connections do safety valves support?
The published specification lists Threaded NPT, Flanged RF or RTJ facing as the available end connections. The connection for a specific size is confirmed at quotation.
What should a quotation inquiry for safety valves include?
The governing standard and class, nominal size, body and seat materials, the service medium with temperature, and the destination — anything missing is confirmed during quotation.