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同心蝶閥

同心蝶閥保持閥桿居中於蝶盤、蝶盤居中於流道，橡膠密封蝶盤全周均勻受力——低壓公用與一般工業用途中經濟輕量的 1/4 迴轉選擇。產品範圍涵蓋 2" 至 72"（DN 50 至 DN 1800），PN6-PN16（85-232 psi），閥體為球墨鑄鐵、碳鋼、不鏽鋼或青銅，端接有對夾、凸耳與 RF 法蘭，操作為手柄、蝸輪、氣動、電動或液動。密封基於彈性體——EPDM（飲用水 WRAS）、NBR（油類服務）或 PTFE（pH 1-14 腐蝕介質）——引用軟密封結構具 EN 12266 Class A 零洩漏關斷，鳩尾/壓環式閥座可在線更換。由於蝶盤在部分行程中摩擦閥座，閥座摩擦、扭矩（約 90 度行程，引用結構 DN200 手動 ≤80 N-m）、溫度（典型 -20 至 120 C，升級 304L 可至 -40 C）與介質相容性決定使用界限；更高溫度或壓力應轉用單偏心與多偏心設計。標準涵蓋 API 609、MSS SP-67、ISO 17292、GB/T 12238 與 EN 593，並提供 API 598 水壓驗收與 API 607 防火認證。

屬於蝶閥系列

最後更新： 2026-11

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系列規格

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

範圍與來源備註

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.