Zhejiang Chengyi Valve Co., Ltd is one professional manufacturer of many kinds of valves such as high pressure valves such as ball valve, gate valve, check valve, globe valve as well as butterfly valve, strainers, flanges and the specials valves according to custom's requirement.

Our company has got the certificates of ISO 9001: 2000, API 6D, API 607 and CE.

With superior quality ensured, our valves are extensively used in the industries of oil refining, chemical fiber, chemical engineering, power station, chemical fertilizer and medicine. Our products have been exported to United States, Germany, France, Italy, Morocco, Czech Republic, Singapore, Brazil and Qatar and so on.

Design and Manufacture: API 600 (ISO 10434)or API 6D.
Inspection and Test: API 598, API 600 or API 6D.
End flange dimension: ASME B16.5(for NPS≤24); ASME B16.47 series B\API 605 or ASME B16.47
Series A\MSS SP-44(for NPS>24).
BW end dimension: ASME B16.25.
Socket-weld dimension: ASME B16.11.
Face to face and end to end: ASME B16.10.
Pressure-temperature ratings: ASME B16.34.

Adopt the following structure:
Fullbore
Flexible or rigiddisc or soft seal structure
Self-centering gland or plate Renewable seat
Bolted bonnet, spiral would eight-square gasket
Sealing bonnet or pressure seal bonnet