How to read a cylinder valve datasheet

A cylinder valve specification fits on half a page, which makes it easy to skim and easy to misread. The lines look like one list, but they are four different kinds of statement: what the valve is, how much pressure it is rated for, how it connects, and what the factory has not yet confirmed. Reading it well means treating each kind differently.

Take the XF-35H page as an example, because every value on it is a factory record: working pressure 30MPa, bore 4mm, two connection designations, and a safety device setting given as a range. Five lines, four kinds of fact.

The identity line

The model designation is the only identity that matters. A family name groups valves that share a general form; it does not promise that two members are interchangeable. Working pressure, bore, connections and certification scope are all recorded per exact model, so a quotation, a drawing request and an order should all carry the exact designation, not the family.

Cast markings on the body are a separate thing again. They are part of the casting, they help with traceability, and they are not the specification. A figure cast into a body is confirmed against the factory record before it is treated as a rating.

The pressure line

Working pressure is recorded in the unit the factory used. On the XF-35H it reads 30MPa; on the CGA320A it reads 2175Psi. ANYI publishes these without converting them, because a conversion introduces a rounding decision that nobody has signed off. If you need the value in your own unit, convert it yourself and confirm the result with us rather than assuming the published figure was already converted.

A working pressure is not a test pressure and not a burst pressure. If your specification names a different rating, say which one you mean; they answer different questions and are established by different procedures.

The bore line

The bore is a flow dimension. The XF-35H, CGA320A and XF-05B each record a 4mm bore; the QF-10 records 6mm. Two valves with the same connections can differ here, and the difference shows up in filling and discharge time rather than in whether the valve fits.

The connection lines

Two connection designations are recorded per model. Which is the cylinder side and which the outlet is confirmed with the factory before quotation rather than inferred from the order they appear in. That is a deliberate choice: on some pairs the roles are obvious to an experienced buyer, and on others they are not, so no inference is published either way.

Four lines that are easy to over-read

• A value in the factory's own notationThe original is published unchanged and the English description is added once it is confirmed. Until then the row says so, which is a status, not a specification.
• "No record on file"The factory has no record for that item. It does not mean the feature is absent, and it should not be read as one.
• A safety device setting given as a rangeThe XF-35H records 40.5MPa to 45MPa. A range is the record; it is confirmed for the exact model before it is relied on.
• A value your own drawing contradictsSend both. A difference between a drawing, a marking and a record is information, and it is resolved against the factory record rather than by choosing one.