This is what a buyer checks before they shortlist a machinery and equipment supplier.
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 · Written for valve manufacturers selling to business buyers
What does a buyer check before specifying a valve?
What a buyer needs to identify the product
These are the fields a buyer scans before deciding whether you are worth contacting. Missing one of them usually ends the visit without an email.
- 1
Valve type
Gate, globe, ball, butterfly, check and control valves do different jobs.
- 2
Pressure class and temperature rating
The governing specification for the piping class.
- 3
Body and trim materials
Must survive the fluid and the temperature.
- 4
Size range
A direct filter on the enquiry.
- 5
End connections
Flanged, threaded, welded and wafer must match the pipework.
- 6
Design and test standards
Determine acceptance and leak class.
- 7
Actuation options
Manual, pneumatic, electric and hydraulic change the whole assembly.
The documents buyers ask for
Not all of them belong on a public page. Naming the ones you can issue is what separates a supplier who can be audited from one who cannot.
| 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 |
Where valves sites lose the enquiry
Each of these is common, cheap to fix, and costs an enquiry that never arrives — so nobody ever reports it.
Design standard referenced without a number
Piping specifications name standards. A valve that cannot be mapped to a named standard cannot be written into a specification.
Leak or seat test class not stated
It is the specification difference between two apparently identical valves and the reason one is cheaper.
Trim materials not separated from body materials
Trim is what contacts the flow and what fails. A single material statement for the whole valve is not usable for fluid compatibility.
What the enquiry form should ask
A form that collects these can be answered properly the first time. A form that collects a name and a message cannot.
Enquiry form — valves
Enough to reply usefully, short enough that a buyer finishes it.
- 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.
Documents and standards named here are the ones buyers in this industry commonly ask for; requirements vary by market, customer and contract, so treat this as a starting checklist rather than a compliance list. Clearer pages can help discovery and evaluation. They do not guarantee rankings, AI citations, enquiries or revenue.
Illustrative
An enquiry from this search looks like: Material specification required · Valve type and size · Service fluid, pressure and temperature · End connection standard
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