Request the tolerance for the height at which the stem of a standard valve protrudes from the bracket
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I am looking for the tolerance values for the stem height of standard valves. Many valves are required by customers to have a bare shaft; the connection flange follows the ISO 5211 standard, and the customers supply their own electric or pneumatic actuators. At this point, it becomes a bit problematic regarding the height to which the valve stem protrudes from the bracket; although there are standards for this, errors always occur during the valve assembly process. . . So, I was wondering, is there such a standard?
The valve assembly diagram should indicate the height deviation; moreover, such a small height deviation will not affect the assembly of the actuator. We’ve never encountered it.
High or low points do not affect the installation of the actuator. However, if it is a bare shaft, things get complicated when third-party quality inspectors hired by foreigners are involved; without providing them with a standard, they will go by the dimensions specified in the drawings. It will be more troublesome to handle
That’s true, especially for Lloyd’s certification; our assembly drawings always indicate the height tolerances.
What is the tolerance for the marked height? Is it based on the factory standards?