How to select a safety valve spring
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How to select qualified safety valve springs: L
1. Spring operating pressure class: It refers to the pressure rating of the spring. 2. Spring heat treatment and elongation amount
The spring operating pressure grade is selected based on the nominal pressure of the safety valve. The relationship between the nominal pressure of the safety valve and the spring operating pressure is shown in the table below: Table of Relationship between Nominal Pressure PN and Spring Operating Pressure. Table 1: PN – Spring Operating Pressure Grades 1.6: 0.06–0.1; >0.12; >0.16–0.25; >0.25–0.4; >0.4–0.5; >0.5–0.6; >0.6–0.8; >0.8–1.0; >1.0–1.3; >1.3–1.6. 2.5: >1.3–1.6; >1.6–2.0; >2.0–2.5. Suitable only for pressures greater than 1.3 MPa. 6.4: ->1.3–1.6; >1.6–2.0; >2.0–2.5; >2.5–3.2; >3.2–4.0; >4.0–6.4. Suitable only for pressures greater than 1.3 MPa. 10: >4–5; >5–6.4; >6.4–8; >8–10. Suitable only for pressures greater than 4.0 MPa