What does a buyer check before specifying a valve?
They check the pressure class and temperature rating, the body and trim materials against the fluid, and the end connection standard. Then the test standard the valve is proved to, because leak class is what distinguishes valves that look identical on a datasheet.
A piping engineer is selecting valves for a specification that an inspection authority will review line by line.
Reviewed 4 August 2026
Scope and specifications
- Valve type
- Gate, globe, ball, butterfly, check and control valves do different jobs.
- Pressure class and temperature rating
- The governing specification for the piping class.
- Body and trim materials
- Must survive the fluid and the temperature.
- Size range
- A direct filter on the enquiry.
- End connections
- Flanged, threaded, welded and wafer must match the pipework.
- Design and test standards
- Determine acceptance and leak class.
- Actuation options
- Manual, pneumatic, electric and hydraulic change the whole assembly.
Documents buyers may need
| Document | What it proves | Where it belongs |
|---|---|---|
| Pressure test certificateAsked at: every valve, with delivery | Shell and seat test results against the applicable test standard | Per shipment |
| Material test certificateAsked at: acceptance | Composition and properties of body, bonnet and trim | Per shipment |
| Design standard conformityAsked at: specification stage | That the valve is designed to the standard the specification names | Publish it |
| Fire safe test certificateAsked at: hydrocarbon services | Fire-safe performance where the service requires it | Name it, share on request |
| Fugitive emission test reportAsked at: environmental compliance | Stem sealing performance against a named standard | Name it, share on request |
| Third-party inspection acceptanceAsked at: project orders | Willingness to be inspected by the buyer's nominated agency | Publish it |
| Dimensional standard conformityAsked at: installation planning | Face-to-face dimensions to the standard named | Publish it |
Details for a useful enquiry
- Service fluid, pressure and temperature
- The basis of any selection.
- Valve type and size
- Determines whether you can quote.
- Material specification required
- Usually fixed by the piping class.
- End connection standard
- Must match the pipework.
- Actuation requirement
- Changes the assembly and the price.
- Test and inspection requirements
- Third-party inspection needs planning.
Questions suppliers ask
What is the most useful page a valve manufacturer can publish?
A pressure and temperature rating table by material, with face-to-face dimensions and the design standard named. Piping engineers work from exactly that table, and its presence is often the reason a manufacturer gets specified rather than merely quoted.
How should test standards be presented?
Name the test standard and the leak class achieved, per valve type. Valves are compared on price constantly, and the test class is usually where the difference is. Making it explicit turns a losing price comparison into a specification argument you can win.
Do buyers need actuator information on the valve page?
They need to know the mounting standard and the torque figures, so an actuator can be sized without contacting you. Whether you supply the actuator or not, publishing the interface data makes your valve easier to design in and harder to substitute.
Check which documents and standards your buyer needs; requirements vary by market, customer and contract.
Plact Research. Plact's editorial desk for buyer-evidence research. Industry standards, documents and buyer questions are researched and drafted with Plact's AI tools, then reviewed by Praveen Kavuri before publication. Every claim cites the standard, regulation or public source it rests on.
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