Produttori di valvole a farfalla should be compared by the suitability and traceability of the exact valve offered—not by size, pressure class, or price alone. For industrial isolation or approved throttling duty, verify the service medium, design pressure and temperature, valve geometry, seat and wetted materials, actuator torque, leakage acceptance, and inspection evidence. This manufacturer-evaluation checklist helps EPC engineers and buyers screen designs, normalize technical bids, and prepare an RFQ without assuming that one model or supplier capability applies to every project.
Raymon Valve presents butterfly valve sourcing and technical coordination for industrial projects. The actual manufacturing entity, inspection responsibility and deliverable scope must be confirmed for each quoted valve. Use this page to compare butterfly valve designs, prepare a technical specification, and identify the evidence to request before placing an order.
Start with the datasheet: Define fluid composition, design pressure and temperature, nominal size, pressure class, end connection, shut-off requirements, operating method, and inspection scope. Final suitability must be confirmed for the selected valve model.
Explore Butterfly Valve Products and Configurations
The existing butterfly valve category page includes product navigation for wafer, lug, flanged, soft-seated, metal-seated, high-performance, triple-offset and actuated configurations. Keep those original product cards and genuine product photographs on the published page. Use the engineering checks below to compare the relevant configurations; individual model availability and specifications require confirmation.
For detailed model-level evaluation, review the high-performance butterfly valve e butterfly control valve pages where relevant, or request a model-specific datasheet. These examples do not imply that all listed configurations share the same ratings or testing.
Scope of this module: Engineering selection, supplier comparison and RFQ preparation. Existing commercial product cards, images and quote tools remain authoritative only to the extent supported by approved model documents.
Industrial Butterfly Valves for Project Requirements
A butterfly valve uses a rotating disc for quarter-turn flow isolation and, where the valve design and operating conditions permit, throttling. Compact construction can be attractive for industrial piping, but a valve suitable for general water service cannot automatically be transferred to corrosive, abrasive, high-temperature, or high-differential-pressure duty.
Before requesting a quotation, the buyer should identify the process medium and phase; normal and design pressure and temperature; nominal size; pressure class; end connections; materials; required shut-off performance; differential pressure; operating frequency; and documentation requirements.
Quick Selection: Match the Valve to the Service
For a broader engineering overview of construction, materials and application considerations, see the Guida alla selezione valvole a farfalla. The checks below support preliminary screening and do not replace model-specific verification.
Use the following as a bid-preparation screen, not as an approval of a valve design. A proposed model must still be checked against its pressure-temperature rating, materials, leakage test basis, and installation conditions.
| Project condition | Initial review | Conferma richiesta |
|---|---|---|
| Water or utility isolation | Consider a compatible resilient-seated design | Water chemistry, seat compatibility, differential pressure and rating |
| Elevated temperature | Review seat limitations and suitable offset constructions | Model-specific pressure-temperature envelope and leakage acceptance |
| Corrosive or abrasive medium | Review all wetted components and solids exposure | Fluid concentration, particle characteristics, corrosion/erosion assessment |
| Automated frequent cycling | Review actuator type and operating duty | Breakaway, running and seating torque, cycle rate and supply conditions |
| Maintenance or dead-end isolation | Review lug or other suitable connection arrangements | Manufacturer-approved dead-end pressure and installation instructions |
| Specified tight shut-off | Evaluate seat design and testing requirements | Test medium, direction, pressure, standard and leakage criterion |
Butterfly Valve Types and Construction Options
Wafer, Lug, and Flanged Butterfly Valves
For a model-level example of wafer construction, review the high-performance wafer shut-off butterfly valve. Confirm the quoted model’s connection dimensions, pressure rating, materials and seat-test requirements before selection.
Wafer butterfly valves are fitted between mating pipeline flanges. Their compact construction can reduce installation space, but flange compatibility, bolting, and maintenance arrangements must be checked.
Lug butterfly valves use lugged body connections. They can be considered for piping arrangements with particular maintenance needs, but dead-end service is permitted only when the specific product design and rating support it.
Flanged butterfly valves incorporate flanged ends. Confirm flange standards, drilling, face-to-face dimensions, gasket arrangement, and pressure rating against the piping specification.
Concentric, Double Offset, and Triple Offset Designs
Concentric butterfly valves commonly use resilient seating and are evaluated for compatible utility and process duties within the manufacturer’s verified limits.
Double offset butterfly valves use eccentric geometry that can reduce certain seat-contact effects during operation. Seat construction, differential pressure, and shut-off requirements remain design-specific.
Triple offset butterfly valves use additional sealing geometry and may be considered for selected demanding isolation services. Triple offset construction alone does not establish a particular leakage class, fire-test qualification, or service rating.
| Progettazione | Initial evaluation direction | Confirm before purchase |
|---|---|---|
| Wafer | Compact installation between flanges | Flange compatibility and installation limits |
| Lug | Maintenance-oriented piping layouts | Dead-end rating and bolting |
| Flangiata | Integral flanged connection | Flange standard and face-to-face dimensions |
| Concentric | Compatible utility and process services | Seat material and pressure-temperature limits |
| Doppio eccentrico | Eccentric sealing design | Seat construction and leakage performance |
| Triplo eccentrico | Selected demanding isolation duties | Sealing qualification and service limits |
Butterfly Valve Materials and Seat Selection
RFQ scenario — seat compatibility: A quotation may list an EPDM seat without stating the cleaning chemicals or maximum process temperature. The material name alone does not establish compatibility: request the fluid composition, concentration, normal and upset temperatures, cleaning cycle, and the exact seat compound approval. If those inputs are unavailable, mark seat suitability Not Confirmed rather than approving the quotation.
Material selection starts with the process medium and the full operating envelope. Review the body, disc, stem, seat, and other wetted components as an assembly, rather than selecting one preferred alloy in isolation.
Corpo
Review pressure-temperature rating, corrosion exposure, mechanical requirements, and applicable design rules. Potential material families include iron, carbon steel, stainless steel, and project-specific alloys, subject to the actual product offering.
Disc and Stem
Check corrosion, erosion, mechanical loads, torque transmission, and seat-contact conditions. Verify the exact material and construction from the proposed datasheet.
Soft Seats
EPDM, NBR, PTFE-based, and other seat constructions have different chemical and temperature limitations. Compatibility must be confirmed for the medium and concentration.
Sedi metalliche
Metal seating may be considered where soft-seat limitations apply. A metal seat does not by itself guarantee a particular shut-off leakage class.
Manual, Pneumatic, and Electric Butterfly Valve Actuation
Actuator review scenario: An actuator selected only from valve size may operate during a shop test yet fail to seat against the maximum specified differential pressure. Request breakaway, running and seating torque for the offered seat and service, then check the actuator output at minimum available air pressure or voltage and the required fail action. Do not infer a suitable actuator size from nominal diameter.
Operation may be manual or automated. A lever may be appropriate where torque and access permit; a gearbox provides mechanical advantage. Pneumatic and electric actuators can support remote or automated operation when matched to the valve and control system.
Actuator selection requires manufacturer-confirmed breakaway, running, and seating torque under the specified differential pressure and temperature. Also define operating time, frequency, supply conditions, accessories, and the required failure position.
Installation and Operating Risks to Review
Installation review scenario: A valve may match the mating flange standard but its rotating disc can extend into a pipe liner, reducer or adjacent spool. Before approval, compare the manufacturer disc-sweep drawing with the actual pipe bore and installation clearance; verify the permitted gasket and bolting arrangement rather than relying on flange size alone.
Even a correctly specified butterfly valve can perform poorly if the installation and operating envelope are overlooked. Flag the following items during design review and technical bid clarification.
| Potential issue | Perché è importante | Verification before release |
|---|---|---|
| Disc interference with adjacent piping | The disc may project beyond the valve body during rotation | Check actual disc sweep, pipe bore, flange and adjacent equipment clearances |
| Unsupported dead-end operation | Connection and bolting loads may differ from normal installation | Request explicit dead-end approval and rating for the selected model |
| Wrong gasket or flange arrangement | Sealing and clamping loads depend on the valve-end design | Follow the manufacturer installation drawing and flange/bolting instructions |
| Excessive differential pressure or throttling duty | May cause vibration, cavitation, noise, erosion or operating difficulty | Review flow conditions, operating opening range and valve suitability |
| Insufficient actuator torque | Valve may fail to open, close or seat reliably | Confirm torque at worst-case differential pressure and supply conditions |
| Seat exposure outside its limits | Can compromise sealing and service life | Verify temperature, chemical compatibility and cleaning/sterilization conditions |
Confirm Manufacturer, Supplier and Inspection Responsibilities
When comparing butterfly valve manufacturers, distinguish the company issuing the quotation from the entity responsible for the offered valve. A commercial butterfly valve supplier may manufacture, assemble, source or coordinate production through different entities. Before technical bid acceptance, request the legal manufacturing entity and production location for the proposed model, identify who controls final assembly and pressure testing, and agree who signs inspection records. Do not infer these details from a website category description alone.
| Responsibility | Evidenza da richiedere | Acceptance status |
|---|---|---|
| Manufacturing entity and location | Named entity, production location and agreed scope | Pending project confirmation |
| Product model and rating | Approved datasheet, drawing and pressure-temperature limits | Pending model documents |
| Tracciabilità dei materiali | Specified material certificates and identification records | Per purchase specification |
| Test e ispezione | Agreed ITP, test procedures, witness points and signed reports | Per purchase specification |
| Documentation release | Deviation list, as-built documents and final document index | Per purchase specification |
Raymon Valve’s company overview describes wider manufacturing and quality activities, but this page does not independently establish that every activity applies to the specific butterfly valve offered. Request evidence against the quotation and purchase order.
Manufacturing Quality, Inspection, and Documentation
Receiving inspection scenario: A material test certificate can be complete while a component identification or heat-number transfer is missing. Where the project requires positive material identification (PMI), agree the component coverage and acceptance procedure; PMI is an alloy-verification check, not a replacement for the material certificate, heat-treatment record or traceability chain.
When evaluating butterfly valve manufacturers, request documented evidence suited to the project risk and purchase specification. General marketing descriptions do not replace model-specific technical records.
Tracciabilità Materiali
Where specified, define which components require material certificates, heat-number identification, and traceability records. Request the relevant material specifications and document format before purchase.
Manufacturing and Assembly Controls
Relevant controls may include dimensional checks, component identification, assembly verification, and functional testing. For critical projects, agree the inspection and test plan (ITP), hold points, and witness points in advance.
Shell and Seat Testing
Shell testing addresses pressure-boundary integrity under defined test conditions. Seat testing addresses closure leakage under a specified test procedure and acceptance criterion. Neither test alone proves fitness for every operating environment. See the valve pressure testing guide for additional background.
A functional test checks specified operation, not pressure-boundary integrity or seat tightness. NDT methods such as RT, UT, MT and PT address different discontinuity types and coverage; a successful hydrostatic test does not exclude every internal defect. Fire-safe and fugitive-emission qualification, where specified, require their own applicable evidence and cannot be inferred from routine shell or closure testing.
Ispezione di terze parti
Specify any third-party witness requirements, inspection milestones, reports, and acceptance criteria at RFQ stage. Ask the supplier to confirm the available evidence and identify deviations.
For broader context, review the processo di produzione valvole resource. This link provides background, not proof that every capability applies to the quoted product.
Butterfly Valve Standards and Testing Requirements
Different standards govern different aspects of a valve purchase. The buyer must identify the applicable scope, edition, project requirements, and documented conformity of the proposed model. For primary references, consult the International Organization for Standardization (ISO) e sulla American Petroleum Institute (API); these organizations publish standards information, but referencing a standard does not establish certification or model-specific compliance.
| Standard | General reference area | Procurement check |
|---|---|---|
| API 609 | Butterfly valve product requirements within its scope | Confirm applicability and specified edition |
| EN 593 | Industrial metallic butterfly valves within its scope | Confirm product scope and edition |
| API 598 | Ispezione e prova di pressione della valvola | Specify relevant tests and acceptance criteria |
| ASME B16.5 | Pipe flanges and flanged fittings within its scope | Verify flange dimensions and pressure class |
| ISO 5208 | Collaudo di pressione delle valvole metalliche | Define applicable leakage acceptance criteria |
Refer to the valve standards resource for related terminology. The standards listed above are general references; they do not constitute a claim that every Raymon Valve product has been tested or certified to them. Confirm the latest ISO 5208 edition and its applicability with the official standards publisher and the controlling project specification before purchase.
How to Evaluate Butterfly Valve Manufacturers
A technical bid evaluation of butterfly valve manufacturers should compare suppliers on the same documented requirements. Ask each supplier for model-specific drawings, material details, pressure-temperature ratings, testing scope, actuator data when applicable, and an explicit deviation list.
| Evaluation area | Evidenza da richiedere | Risk controlled |
|---|---|---|
| Costruzione della valvola | Datasheet and dimensional drawings | Wrong configuration or connection |
| Materiali | Material specifications and certificates | Unverified compatibility |
| Classe di pressione | Model-specific rating information | Incorrect service envelope |
| Seat performance | Test basis and results where required | Unacceptable leakage |
| Azionamento | Valve torque and actuator specification | Inadequate operating capability |
| Ispezione | ITP and inspection records | Missing acceptance evidence |
| Commercial scope | Quotation and technical deviation list | Unclear exclusions |
Verify whether the quoted company performs manufacturing activities, supplies third-party products, or offers both. Manufacturing responsibility, traceability, inspection arrangements, and warranty scope should be established from documents rather than inferred from the word “manufacturer.”
Normalize Technical Bids Before Comparing Price
Two quotations may use the same nominal size and pressure class while offering different seats, end connections, leakage acceptance, test records or actuator accessories. Record each proposed exception as Compliant, Deviation o Not Confirmed; request a written clarification before treating the bids as equivalent.
Example clarification: “Please confirm whether the offered lug butterfly valve is rated for the specified dead-end service at the design differential pressure, and provide the model-specific supporting document.”
Documentation by Procurement Milestone
| Milestone | Documents or decisions to agree |
|---|---|
| RFQ / technical bid | Datasheet, GA drawing, material list, pressure-temperature rating, exceptions and testing proposal |
| Before manufacture or inspection | Approved drawings, ITP, hold/witness points, traceability and inspection scope |
| Before dispatch | Agreed test reports, material records, inspection release, marking, packing and O&M documents |
Butterfly Valve RFQ Checklist
Provide the following information when requesting quotations from butterfly valve manufacturers, so technical offers can be compared on the same basis:
Process Conditions
- Medium, composition, and phase
- Normal and design pressure
- Temperatura normale e di progetto
- Pressione differenziale massima
- Isolation or throttling duty
Valve Configuration
- DN/NPS and PN/Class
- End connection and flange standard
- Body, disc, stem, and seat materials
- Required leakage acceptance
- Standard di progettazione e collaudo
Azionamento
- Lever, gearbox, pneumatic, or electric
- Operating time and duty cycle
- Air/electric supply
- Fail position and control accessories
Inspection and Delivery
- Shell and seat testing
- Material certificates and traceability
- ITP and witness points
- Drawings, manuals, and records
- Marking, packing, and shipping scope
Domande frequenti
What should buyers look for in butterfly valve manufacturers?
Evaluate product suitability, material compatibility, pressure-temperature ratings, testing, traceability, documentation, technical deviations, and the supplier’s ability to support the specified project.What is the difference between a butterfly valve manufacturer and a supplier?
A manufacturer performs defined manufacturing activities, while a supplier may provide products made by another organization. Confirm actual manufacturing responsibilities and documentation rather than relying on the company description alone.Which butterfly valve type is best for industrial applications?
No single design suits every service. Concentric, double offset, and triple offset valves have different characteristics. Final selection depends on verified process conditions and product data.Can butterfly valves be used for throttling?
Some designs can be used for throttling where approved. Check flow characteristics, differential pressure, cavitation, erosion, vibration, and actuator requirements with the manufacturer.What testing documents should a butterfly valve manufacturer provide?
The purchase specification may require shell and seat test records, material certificates, dimensional inspection reports, functional test records, and an ITP. Exact requirements depend on the project.Can butterfly valves use pneumatic or electric actuators?
Many designs can be configured for pneumatic or electric operation. Actuator selection must be based on confirmed valve torque and operating conditions.
Request a Butterfly Valve Quote
Send your datasheet or project specification for a technical and quotation discussion. Include the medium and composition, normal/design pressure and temperature, maximum differential pressure, size, pressure class, end connection, materials, leakage acceptance, operating method, required inspection documents, and requested delivery scope. If any field is not yet known, identify it as to be confirmed so the technical review can address the gap.Submit Your Butterfly Valve Datasheet
Final valve suitability and any applicable ratings, qualification, or testing scope must be confirmed for the proposed model.
Nota ingegneristica: Prepared by Raymon Valve Technical Content Team for preliminary engineering and procurement review. The selection tables are screening tools, not approval of a particular product. Confirm current standards, project requirements, manufacturer-approved datasheets, service ratings, test evidence and actuator torque before ordering. Named individual technical reviewer and product-specific evidence have not yet been supplied.
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