I am used to see the nominal pressure of an hydraulic valve to be identified with PN letters. So a PN10 valve would be a valve with a nominal pressure of 10bar. Am I right?Now, for a certain project, a supplier offered, for a PN10 specification, a PS2,5 dismantling joint.Is he talking about the same thing? What is the nominal pressure of a PS2,5 component?terje61/macPT, your last conclusion seems sensible, as any dismantling joint would have to be supplied to a certain norm, and a pressure class within this norm.On the other side a PS joint is normally a 'non lockable' dismantling joint made in one tubular (welded) piece, the two ends to slip over two flangeless pipe-ends of (usually) a slight different dimension, to connect them together.This dismantling joint will not have normal end-flanges. It will however have end flanges to steer throughgoing bolts. The bolts are necessary to tighten clamping flanges (is this the correct expression in english?) on both ends which press and hold the joints profile sealings in place.I mention this, because the holding and clamping flanges might in measurements deviate from normed flange form, and no information about norm might be read from this.Back to basic then: only two ways to determine allowable pressure. Either have supplier to give information, or do a full material calculation and testing against norm.

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