A21 is a spring type micro lift safety valve with external thread connection, equipped with connecting pipe and connecting pipe nut. Design, manufacture and inspection according to GB / t12241-12243. Suitable for air, ammonia, petroleum gas, water and other media equipment and pipelines.

Specification: dn10 ~ 25

Pressure class PN16 ~ 500

Throat diameter 12-20mm

Temperature range ≤ 200 ° C