... and adjust flow rate, also include oil into outlet pipeline, shut off oil well when necessary, and apply to acid fracturing, water ... convenient operating and repairing.• Can be equipped with (pneumatic) hydraulic safety valve.• Working pressure: 2000PSI~20000PSI• Working medium: oil, natural gas ... LU)• Material class: AA,BB,CC,DD,EE,FF • Specification level: PSL 1-4• Performance level: PR 1-2