In January 2017, powerful valve co., LTD., received by the zhejiang province bureau of quality and technical supervision issued by the "special equipment manufacturing license (pressure piping components), TS certification number: TS2733D08-2021, were allowed to engage in the following pressure piping components manufacturing:" levels: B1, B2, varieties range: metal valve; note: gate valve PN = 6.4 MPa, DN < 200 mm, the PN < 6.4 MPa, DN 450 mm or less; stop valve PN = 6.4 MPa, DN < 200 mm, the PN < 6.4 MPa, DN 400 mm or less; ball valve PN = 6.4 MPa, DN < 200 mm, the PN < 6.4 MPa, DN 300 mm or less; check the PN = 6.4 MPa, DN < 200 mm, the PN < 6.4 MPa, DN 450
