Industriële ventielen volgens API · ASME · DIN · EN
Concentrische Vlinderkranen
Concentrische vlinderkranen houden de as gecentreerd in de schijf en de schijf gecentreerd in de doorstroming, zodat de rubber-zittende schijf gelijkmatig rondom draagt — de economische, lichte kwartslagkeuze voor lagedruk-nuts- en algemene industriële dienst. Het bereik omvat 2" tot 72" (DN 50 tot DN 1800) bij PN6-PN16 (85-232 psi), in nodulair gietijzer-, koolstofstaal-, roestvast staal- of bronzen bodies met wafer-, lug- en RF-geflenste einden, hendel-, versnellingsbak-, pneumatische, elektrische of hydraulische bediening. Afdichting is elastomeergebaseerd — EPDM (drinkwater WRAS), NBR (oliedienst) of PTFE (corrosieve media pH 1-14) — met EN 12266 Klasse A nul-lekkage-afsluiting op gerefereerde zachte-afdichting-bouw en duifstaart/drukring-zittingen die in lijn vervangen kunnen worden. Omdat de schijf over een deel van zijn reis over de zitting wrijft, bepalen zittingswrijving, koppel (≈90-graden slag, ≤80 N-m handmatig bij DN200 op gerefereerde bouw), temperatuur (-20 tot 120 C typisch, -40 C met 304L-upgrade) en media-compatibiliteit de taaklimieten; hogere temperatuur of druk gaat naar enkel- en meervoudig-offset ontwerpen. Normen omvatten API 609, MSS SP-67, ISO 17292, GB/T 12238 en EN 593, met API 598 hydro-acceptatie en API 607 fire-safe-certificering beschikbaar.
Onderdeel van de Vlinderkranen familie
Laatst bijgewerkt: 2026-11
Familiespecificaties
| Nominal valve connection size | 2”~72”(DN50-DN1800) |
|---|---|
| Pressure class / nominal rating designation | 85~232Psi（PN6~PN16） |
| Seat material | NBR, EPDM, PTFE |
| Disc Materials | Ductile Iron, SS304, SS316 |
| Stem material | Stainless Steel 420, Stainless Steel 410 |
| Valve body material | Ductile Iron, Carbon Steel, Stainless Steel, Copper |
| End connection types | Wafer, Lug, RF |
| Operation / closure mode | Lever, Gear, Pneumatic, Electric, Hydraulic |
| Seat leakage class | Seat leakage on the referenced line is specified at EN 12266 Class A with a leakage rate of 5x10-8 m3/s or less, i.e. zero-leakage soft-seal shutoff. |
| Service temperature range | 0 to 80 C |
| Design standards | API 609 |
| Design standards | DIN 3202, DIN 2501 PN10/PN16 |
| Face-to-face dimensional standard | BS 5155 |
| zero offset definition | Definition: a concentric butterfly valve is a quarter-turn valve in which the shaft, disc centre and body centreline are aligned in a zero-offset arrangement, so the disc edge compresses a resilient seat to seal. |
| sealing principle | Sealing is elastomer-based: soft seat materials such as EPDM, NBR or PTFE let the disc press firmly into the seat for a leak-proof seal without excessive torque. |
| seat temp pressure limits | Elastic seats set the operating ceiling: high-temperature or abrasive media compromise the seat, which is why the type is generally kept to moderate conditions. |
| seat friction torque | Because the disc rubs against the resilient seat through part of its travel, seat friction, operating torque, temperature limits and media compatibility must be checked at selection rather than assumed. |
| standards frame | Applicable standards span API 609 (wafer/lug/double-flanged), MSS SP-67, ISO 17292 for petroleum service and GB/T 12238 for flanged and wafer connection valves; EN 593 is cited as the European counterpart. |
| standards project dependent | The exact standard and edition are product- and project-dependent; buyers should specify API 609 or EN 593 plus the required inspection and leakage test requirements. |
| size envelope oem | A representative OEM concentric soft-seal line covers DN40-DN1200 as standard with DN1400-DN2000 available only after engineering evaluation - well inside the tenant band of DN50-DN1800. |
| pressure envelope oem | Standard pressure ratings are PN10/PN16 (1.0/1.6 MPa) with a PN25 (2.5 MPa) upgrade path on the referenced execution. |
| temperature envelope | The referenced soft-seal execution serves water, air and oil media from -20 C to 120 C; a low-temperature tested variant to -40 C requires a 304L material upgrade. |
| low temp option | Cryogenic-leaning duties are handled by option rather than standard build: the referenced line lists low-temperature testing to -40 C with material upgraded to 304L. |
| seat material specifics | Seat media matching: EPDM for drinking water (WRAS certified), NBR for oil media (ASTM No. 3 oil test) and PTFE for strongly corrosive service across pH 1-14. |
| seat replaceability | The seat is retained by a dovetail groove or pressure ring so it can be replaced online without removing the valve from the line after wear. |
| lug end function | The lug body carries threaded inserts both sides, letting the valve be installed independent of the downstream flange so pipework can be opened for maintenance without draining the system. |
| connection classification | Connection variants beyond wafer/lug include double-flange bodies for higher pressure or larger diameter and butt-weld bodies welded permanently into petrochemical lines. |
| open flow resistance | Even fully open the disc and shaft remain in the flow passage, so some pressure loss persists and scales with diameter and disc/shaft geometry. |
| eccentric development | The single-eccentric (offset) design exists specifically to answer concentric wear: offsetting the stem from the disc centre reduces friction, extends sealing life and opens the door to higher temperature and pressure duties. |
| actuation torque | Manual builds use a fixed 90-degree stroke with limit-stop feedback; on the referenced line lever operation needs no more than 80 N-m at DN200. |
| testing frame | Acceptance testing on the referenced line runs to API 598 hydrostatic at 1.5 times rating, with API 607 fire-safe certification available through a metal-seal redundancy design. |
| seat temperature ratings table | Buna-N seat: +10 to 180 °F (-12 to 82 °C), EPDM seat (2"–16"): -30 to 275 °F (-34 to 135 °C), EPDM seat (18" and above): -30 to 225 °F (-34 to 107 °C), fluoroelastomer (FKM) seat: 10 to 400 °F (-12 to 204 °C) |
| tight shutoff pressure rating | pressure ratings for tight shutoff up to the seat material temperature limit on wafer and lug bodies: 200 psi for 2"–12" and 150 psi for 14"–72" |
| double flange tight shutoff pressure rating | pressure ratings for tight shutoff up to the seat material temperature limit on double-flanged bodies: 232 psi for 3"–14" and 150 psi for 16"–72" |
| cv fullopen wafer lug | full-open Cv (US-GPM at 1 psi ΔP) spans 115 at 2 in to 73,426 at 30 in on wafer and lug style bodies |
| cv partial open 70deg | Cv at 70° disc opening spans 70 at 2 in to 44,545 at 30 in (US-GPM at 1 psi ΔP) |
| cv partial open 50deg | Cv at 50° disc opening spans 27 at 2 in to 17,010 at 30 in (US-GPM at 1 psi ΔP) |
| torque test basis sizing | seating/unseating torque charts derived from test data with water at 60°F; dry-gas duties multiply by 2.0; figures carry no safety factor — multiply by 1.2 for single-valve actuator sizing or 2.0 for three-way (tee) applications |
| vacuum service rating | vacuum service rating: zero leakage at 24 in Hg vacuum |
| dead end pressure rating | bi-directional dead-end service capability to 200 psi (2"–12") and 150 psi (14"–24") is standard on lug style valves |
| asme flange compatibility | compatible with ASME B16.1 and ASME B16.5 flanges (2"–24"), compatible with ASME B16.47 Series A (MSS SP-44) flanges (28"–72") |
| mss design compliance | designed to comply with MSS SP-67 and MSS SP-25 |
| awwa proof of design | valves 2"–20" meet the intent of and have passed the AWWA C504-87 Section 5 proof of design tests |
| potable water ped certification | CE/PED certification available for 2"–24", NSF/ANSI 61 & 372 certified for potable water and lead-free service (aluminium-bronze or stainless steel builds) |
| marine type approval | type approval certification from ABS and USCG Category A for marine applications (2"–24") |
| seat temperature service caveats | at low temperature the elastomer durometer changes — the hardened seat may increase operating torque beyond the structural limits of the stem and/or disc-to-stem configuration, published temperature ranges may have to be modified in valve duty; ranges shown are adjusted accordingly, on the fluoroelastomer (FKM) seat build the operating pressure is reduced above 275°F, field replacement of seats in sizes 14" and above requires factory service |
| composite execution envelope | composite-body resilient seated wafer line: DN 40 to 300 (NPS 1.5 to 12), -40 to +150 °C (-40 to +300 °F), 10/16 bar (145/232 psi), flange drilling DIN PN 6/10/16, ASME 150, JIS 10K and AS 2129 Table E |
| face to face resilient composite | face-to-face per EN 558-1/Table 5 and API 609 |
| iso5211 integrated top plate | integrated ISO 5211 top plate: actuator flange per ISO 5211 without a separate mounting bracket |
| line velocity limit | usable in high line velocity applications up to 12 m/sec |
| bidirectional leak rate | bubble-tight shut-off in both directions per EN 12266-1 leak rate A |
| water marine approvals | water approvals KIWA, WRAS and NSF; certified and approved per Det Norske Veritas (DNV) |
| iso5211 pad series by size | ISO 5211 pad series F-05 (DN40–DN50), F-07 (DN65–DN150) and F-12 (DN200–DN300) |
| shaft diameter envelope | shaft diameter (h9 class) 12 mm at DN40–DN50 up to 25 mm at DN250–DN300 |
| stem seal dual design | primary stem sealing exceeds the valve pressure rating and prevents shaft-area leakage to atmosphere; a secondary shaft sealing provides back-up safety |
| kv fullopen largest size | highest tabulated Kv/Cv value is 9,872.0 / 11,452.00 at the largest listed size fully open (90° column) |
| composite weight envelope | valve mass 0.6 kg (DN40) rising to 10.8 kg (DN300) on the composite execution |
| face to face din series | face-to-face EN 558 Series 20, face-to-face ISO 5752 Series 20, face-to-face API 609 Table 1 |
| flange accommodation standards | flange drilling EN 1092 PN 6/10/16, ASME Class 150, AS 4087 PN 16, flange face EN 1092 Form A/B, ASME RF/FF |
| top flange iso5211 marking | top flange per EN ISO 5211; valve marking per EN 19 |
| tightness dual standard | tightness check per EN 12266 leakage rate A and ISO 5208 Category 3 |
| extended temp pressure envelope | a resilient wafer execution rated -40°C to +200°C (depending on pressure, medium and material) at a maximum operating pressure of 16 bar |
| kv test basis throttling | Kv is the water flow in m³/h at 5°C to 30°C (41°F to 86°F) at 1 bar ΔP; published Kv values based on tests by the Delft Hydraulics Laboratories (Netherlands); throttle function linear between 30° and 70° opening |
| flow velocity limits | permissible flow velocity max. 4.5 m/s for liquids and max. 70 m/s for gases |
| breakaway torque basis | published torque values are initial breakaway torques taken with liquids and lubricating media, to be treated as approximate: the effective value depends on pressure, medium, rubber quality and temperature |
| shaft guidance design | triple shaft bearings prevent shaft deflection and guarantee valve guidance over long service; four flange mounting holes locate the valve between flanges; installation in any desired position; maintenance-free |
| seat material code options | seat material options NBR, EPDM, CSM, FPM and VSI |
| shaft material options | shaft material options stainless steels X39CrMo17-1 and X14CrMoS17, or nickel-molybdenum alloy |
| size | 2”~72”(DN50-DN1800) |
| Pressure Rating | 85~232Psi（PN6~PN16） |
| end connection | Wafer, Lug, RF |
| medium | Water, Oil, Gas |
| top flange | ISO 5211 |
Omvang & bronnotities
| size envelope | Size envelope: tenant band DN50-DN1800 (2in-72in) exceeds the referenced Tianyu standard range DN40-DN1200, which only reaches DN1400-DN2000 after engineering evaluation - the tenant band is an aggregate of OEM envelopes, not one build. |
|---|---|
| pressure framing | Pressure framing: tenant reference 85-232 psi (PN6-PN16) matches the standard PN10/16 builds, but the Tianyu line offers a PN25 (2.5 MPa) upgrade path that sits outside the tenant reference range. |
| standard coverage | Standard coverage: existing design_standard lists API 609 only, while industry practice spans API 609, MSS SP-67, ISO 17292, GB/T 12238 and EN 593 - edition and scope are project-dependent. |
| leakage claim | Leakage claim: EN 12266 Class A zero-leakage soft-seal shutoff is a referenced-OEM figure; hard-seated or high-temperature builds will not meet the same class. |
Bestelling & documentatie
Documenten
Vraag de benodigde documentatieset mee aan bij de aanvraag — gebruikelijke items voor deze uitvoering (materiaalcertificaten, testrapporten volgens de genoemde inspectienorm, maattekeningen) worden in de offerte bevestigd en meegestuurd.
Offerte
Een offerteklare aanvraag noemt: nominale maat en drukklasse, voorkeur voor huis- en zittingsmateriaal, aansluiting, bediening, en het medium met temperatuur. Typische waarden op deze pagina zijn benchmarkreferentiebereiken; de bindende waarden worden in de offerte bevestigd.
Sample & levering
Leveringsvoorwaarden, orderhoeveelheden en levertijd worden per order afgesproken — noem het bestemmingsland en het gewenste schema bij de aanvraag.
Opslag & verzending
Bewaar ventielen met zittingen en afdichtingen beschermd tegen UV, ozon en vervorming, houd de vlakbeschermers op de aansluitvlakken tot installatie, en vermijd bij uitvoeringen met elastomeer- of PTFE-zittingen langdurige buitenopslag — zittingscompounden verouderen het snelst in direct zonlicht en bij vorst.
Veelgestelde vragen
Wat moet een offerteaanvraag voor concentrische vlinderkranen bevatten?
De geldende norm en klasse, de nominale maat, de body- en zittingmaterialen, het medium met temperatuur en de bestemming — ontbrekende informatie wordt tijdens de offerte bevestigd.
Welke maat en drukklasse zijn er beschikbaar bij concentrische vlinderkranen?
Een geverifieerd maat en drukklasse-bereik voor deze klep is nog niet op deze pagina gepubliceerd — het maat en drukklasse dat voor uw toepassing geldt, wordt voorgesteld en bevestigd tijdens de offerte. Stuur de bedrijfsomstandigheden mee met de aanvraag; de selectie wordt in het aanbod vermeld.
Welke bodymateriaal zijn er beschikbaar bij concentrische vlinderkranen?
Een geverifieerd bodymateriaal-bereik voor deze klep is nog niet op deze pagina gepubliceerd — het bodymateriaal dat voor uw toepassing geldt, wordt voorgesteld en bevestigd tijdens de offerte. Stuur de bedrijfsomstandigheden mee met de aanvraag; de selectie wordt in het aanbod vermeld.
Kennis: selectiegidsen
Offerte aanvragen voor Concentrische Vlinderkranen
Dien uw eis hier in — een offerteklare aanvraag noemt de geldende norm en klasse, maat, materialen, medium, temperatuur en bestemming.
Wat er met uw gegevens gebeurt, staat beschreven in onze privacyverklaring.
Een grotere of niet-standaard eis voorbereiden? De Concentrische Vlinderkranen-offertegids legt uit wat u moet meesturen, welke standaardbereiken en opties er zijn en welke documenten u kunt bijvoegen.
Offerte voor Concentrische Vlinderkranen
Stuur norm, drukklasse en maat voor een offerteklare aanvraag — beantwoord met documenten en voorwaarden.