If the valve seatdiameter is not known, the port diameter can be assumed to be the seatdiameter for estimating purposes.
阀门阀座直径。如果不知道阀门阀座的直径，则可以将端口直径作为阀座直径进行估算。
2
The outside diameter, outer ring width and shaft seatdiameter are identical to the dimensions of the standard spherical roller bearings range.
外部直径，外圈的宽度和轴座直径相同的尺寸标准的球面滚子轴承范围。
3
Note: the seats and springs of the first and second check modules are not interchangeable. The heavier spring and smaller diameterseat belong with the first check module.