Safety Valves · Customisation & quotation guide
Requesting a Quote for Safety Valves
A safety-valve quotation is sized by set pressure and orifice, not by pipe size alone. The parameters below decide the nozzle area, the spring range and the certification path, so a quote prepared with them in hand moves straight to selection instead of cycling back for missing data.
Last updated: 2026-10
Required inquiry parameters
An inquiry that states these values is quotation-ready — selection can start without a second round of questions.
| Parameter | Why the quote needs it |
|---|---|
| Medium | Decides seat and trim materials and whether the service is gas, vapour or liquid sizing. |
| Set pressure | Primary selection input — the valve must open at the protected system limit. |
| Back pressure | Superimposed and built-up back pressure determine whether a conventional or balanced design is required. |
| Required capacity | The orifice area is chosen from the relieving capacity the system must pass. |
| Size and connection | Inlet/outlet sizes and flange standard fix the installation interface. |
| Temperature | Spring setting, seat materials and body rating all track service temperature. |
Standard ranges and custom options
Published reference ranges for this family, with the question to ask for each dimension when the requirement sits outside the span. Non-standard requirements are confirmed during quotation.
| Dimension | Published range | If non-standard, specify |
|---|---|---|
| Size | 1/2 x 1/2 inch to 12 x 14 inches, depending on model | Inlet and outlet size if different (full-bore vs restricted orifice) |
| Pressure class | PN16 to PN100, Class 150 to Class 600 | Set pressure and allowable overpressure for the protected system |
| Materials | Cast iron, Ductile iron, WCB, SS304, SS316 | Special body or trim materials for corrosive or high-temperature media |
| End connections | Threaded NPT, Flanged RF or RTJ facing | Flange facing and standard (e.g. ASME B16.5 vs DIN) for mating pipework |
| Service media | Steam, Gas, Vapour, Water, Compatible liquids | Media state (gas, vapour, liquid) and any back-pressure at the outlet |
| Design standards | API 520, API 521, API 526 | Market of installation — which code edition and certification marks apply |
Drawings and documentation
What to attach to the inquiry — and what to ask for back with the order confirmation.
Process data sheet
Media, set pressure, back pressure, operating temperature and required relieving capacity.
P&ID excerpt or line list
Shows the protected equipment, inlet/outlet routing and existing connection ratings.
Applicable code reference
The design and testing standard the valve must satisfy for the installation market.
Dimensional envelope constraint
Space or existing flange pattern the valve must fit when replacing in place.
Documents to request with the order
Dimension drawing, material and pressure-test certificates — availability confirmed with the quotation.
Lead time, MOQ and pricing
Supply terms are quoted per inquiry — size, class, materials and certification scope all move them, so they are confirmed rather than published as generic figures.
| Lead time | Contact for confirmation |
|---|---|
| Minimum order quantity | Contact for confirmation |
| Price and validity | Contact for confirmation |
Frequently asked questions
What is the minimum information for a safety-valve quote?
Medium, set pressure, back pressure, required relieving capacity, inlet/outlet size and connection standard, and service temperature. With these seven values selection can start immediately; anything missing is confirmed during quotation.
Can non-standard set pressures or materials be quoted?
Requirements outside the published reference ranges are confirmed during quotation. Send the process data sheet and the applicable code; the confirmation path is the same quotation cycle, not a separate approval process.
How are lead time and MOQ handled?
Lead time and minimum order quantity depend on size, class and certification scope and are provided per inquiry — contact for confirmation rather than relying on a generic figure.
Ordering & documentation
Documents
Ask for the documentation set with the inquiry — typical items (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
Send the medium, temperature, pressure, size and connection for a quotation-ready inquiry. Lead time, MOQ and price are confirmed at quotation, together with the documents to be supplied with the order.
Sample & supply
Supply terms, order quantities and lead time are agreed per order — state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, and keep end-face protectors on until installation; storage limits and shipping arrangements for the selected materials are confirmed at quotation.
Knowledge: selection guides
Ready to request a quote for safety valves?
The inquiry form is on the Safety Valves product page — submit the parameters above there, answered with selection, documents and terms.