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CHECK VALVES TYPES IN API 594

- Check Valves: Wafer, Wafer-Lug, and Double Flanged Type

1 General
1.1 SCOPE
This standard covers design, material, face-to-face dimen-sions, pressure-temperature ratings, and examination, inspec-tion, and test requirements for gray iron, ductile iron, steel, and alloy single and dual plate check valves (supplied by China valve manufacturer). Valve configura-tions include wafer, wafer-lug, and double flanged type with facings that will permit installation between ASME and MSS flanges that conform to the standards and specifications listed in section

1.2 SIZES
This standard covers the following nominal valve size ranges:
a. Classes 125 and 250, NPS 2-48 (excluding NPS 31/2).
b. Classes 150 and 300, NPS 2-60 (excluding NPS 31/2 and 5).
c. Classes 400 and 600, NPS 2-42 (excluding NPS 31/2 and 5).
d. Classes 900 and 1500, NPS 2-24 (excluding NPS 31/2 and 5).
e. Class 2500, NPS 2-12 (excluding NPS 31/2 and 5).

1.3 VALVE NOMENCLATURE
The standard nomenclature for valve parts is shown in Fig-ures 1, 2, 3, and 4. These figures illustrate some wafer, wafer-lug and double flanged type check valve designs (designed by China valve supplier). AlthoughFigures 1, 2, 3, and 4 show typical designs, they are not to be construed as precluding other available designs that comply with the requirements of this standard.

 

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