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V 型切口球閥（V-Notch Segment）

V 型切口球閥使帶成型 V 型切口的扇形球體旋轉 90°，球體轉動時切口邊緣對閥座產生剪切作用——在會卡住完整球體的纖維狀、含漿料或高黏度介質上具有良好的調節與截斷性能。產品範圍涵蓋 3/4" 至 20"（DN20 至 DN300），ASME Class 150 至 600（PN16 至 PN100），閥體為碳鋼、不鏽鋼、合金鋼與雙相不鏽鋼，密封型式有金屬密封與軟密封，配 PDL 系列氣動、PCL 系列氣缸或電動執行器及定位器、電磁閥等附件。切口提供具特性化的固有流量特性（依一家 OEM 系列約為等百分比，依其他資料接近線性——視切口幾何與通口選項而定），公布的可調比（rangeability）約為 100:1 至 300:1，配電動氣動定位器時調節型的基本誤差約在 ±1.5% 滿量程內，遲滯 1.5%、死區 0.6%。關斷等級依 ANSI/FCI 70-2 與 IEC 60534-4 由閥座決定：金屬閥座 Class IV、增強 PTFE Class VI、間隙閥座則刻意在關閉時允許約 5% 最大流量通過。切割纖維、擠出顆粒的剪切邊緣同時也是磨損點：特性不匹配時長時間小開度節流會快速磨損閥座，而讓傳統球閥在高壓差下節流已有記錄證明屬濫用而非正常任務——一條含砂產出水的管線在數小時內就摧毀了閥門內件。現場經驗法則將軟密封對壓差的允許開度限制在約 20 bar，硬質金屬閥座約 60 bar。選型必須針對實際工況評估空化、閃蒸、氣體阻塞流、噪音與磨蝕，氣動噪音依 IEC 534-8-3 預測，液體水動力噪音依 IEC 60534-8-4。調試時進行台架行程測試（全行程、校準、死區、不對稱響應），垂直或水平安裝，氣動版本搭配定位器用於比例調節，或搭配雙電磁閥用於切換任務。選型取決於 V 口角度對調節範圍的匹配、密封型式對介質的適應性，以及執行器對扭矩與失效安全（fail-safe）要求的匹配。

屬於球閥系列

最後更新： 2026-11

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系列規格

Nominal valve connection size	3/4"~20"（DN20~DN300）
Pressure class / nominal rating designation	ASME CLASS 150~600 (PN16~PN100)
Valve body material	Carbon steel, Stainless steel, Alloy steel, Duplex stainless steel
Operation / closure mode	PDL series pneumatic actuator, PCL series cylinder actuator, Electric actuator
Service temperature range	up to 1000F (540C)
seal types	Metal sealing, Soft sealing
applications	Control and cut-off duty on fibrous, slurry-bearing or viscous media
equal percentage characteristic and rangeability	The V-shaped notch in the ball produces an inherent flow characteristic close to equal-percentage, and manufacturers publish adjustable ratios (rangeability) from about 100:1 up to 300:1 depending on the design, allowing fine control over a wide flow turndown range.
positioner control accuracy	With an electropneumatic positioner accepting a 4-20 mA signal, the modulating version is specified with a basic error within about ±1.5% of span, hysteresis within 1.5% and dead band within 0.6%, which sets the achievable control accuracy for actuator and accessory commissioning.
seat type vs shutoff class ansi fci 70 2	Shutoff class is specified per ANSI/FCI 70-2 and depends on seat construction: flexible metal and rigid metal seats reach Class IV, a reinforced PTFE seat reaches Class VI, while a clearance seat allows about 5% of maximum flow even when closed. Seat choice therefore determines whether the valve gives tight shutoff or deliberately limited shutoff in modulating service.
characterized rotary vs isolation ball selection	A standard full-bore ball valve is generally unsuitable for modulating duty because most of its usable flow change occurs over a narrow band of travel; a characterized (V-ball/V-port) design should be selected when its published flow characteristic, pressure-drop capability and shutoff performance suit the process and quarter-turn operation is advantageous.
eccentric seat reduces torque raises differential	An eccentric ball/seat geometry makes the ball wedge against the seat ring only at closure and release quickly on opening; this reduces operating torque, raises the allowable differential pressure, and limits seat rubbing wear compared with a centered design.
hardfaced seat options for severe service	Sealing rings are offered in soft (reinforced PTFE-type) and metal-sealed versions to match different operating conditions, and the sealing surface can be hardfaced with a cobalt-chromium hardfacing alloy for harsher services; the ball surface is hardened, ground and polished for abrasion resistance.
cavitation flashing noise must be evaluated	Selection of a V-port ball control valve for modulating service must evaluate cavitation, flashing, choked gas flow, noise, erosion and rangeability against the actual flow cases, since these pressure-reduction mechanisms - not the valve name - determine whether the trim survives the duty.
shear and selfcleaning for fiber solids	At the moment of closure the V-shaped ball edge shears across the seat, cutting fibers and extruding particles out of the seat area; this shearing plus self-cleaning action is what makes the valve suitable for pulp, wastewater and other fiber- or particle-laden media, and prevents the valve from jamming.
seat wear from prolonged partopen throttling	Seat loading and trim geometry designed mainly for shutoff leave a valve vulnerable to wear during prolonged part-open operation; on a poorly matched characteristic the loop shows cycling, poor low-flow resolution and rapid movement around a narrow operating point, so control-trim suitability must be confirmed for continuous throttling.
throttling a standard ball valve is abuse	Using a conventional ball valve as a throttling valve under high differential pressure is described as abuse rather than proper duty: a Class 900 rising-stem ball valve in produced water with sand destroyed its internals and leaked externally to atmosphere after only hours of throttling, forcing a plant shutdown.
soft seat differential opening limit	A field rule of thumb holds that a soft-seated ball valve should not be cracked open against a differential higher than about 20 bar (and even that can be excessive if parked part-open for hours), while hard-faced metal/metal seats are limited to roughly 60 bar; exceeding these limits during pressure-equalizing operations damages seats.
commissioning bench check and stroke test	Before process commissioning the assembled valve and actuator should be bench-checked and stroke-tested: verify full travel, calibration, action, linkage and feedback/limit indications, stroke the command in both directions, and record any deadband, sticking or asymmetric response.
installation orientation flanged interfaces	The compact quarter-turn body can be installed vertically or horizontally, and the pneumatic V-type control version works with a valve positioner for proportional modulation or with a double solenoid valve and control box for on/off switching duty.
leakage classes ansi fci 70 2 iec 60534 4	Control-valve seat leakage is classified by ANSI/FCI 70-2 and IEC 60534-4: Class IV allows 0.01% of rated capacity and is the usual metal-seated target, Class V allows 0.0005 ml/min per inch of port per psi differential, and Class VI (bubble-tight, 0.15-0.3 ml/min) is the soft-seat class relevant to V-port valves offered with both seat types.
aerodynamic noise prediction iec 534 8 3	Aerodynamic noise from a throttling control valve is predicted with IEC 534-8-3, a five-step method that computes mechanical power at the vena contracta, converts it to noise power via acoustic efficiency factors, and propagates it through pipe-wall transmission losses to a standard observer 1 m downstream; it gives a common basis for comparing valves across vendors.
hydrodynamic noise iec 60534 8 4	For liquid services where a V-port valve throttles with high pressure drop, hydrodynamic noise is covered by the companion standard IEC 60534-8-4, which many manufacturers embed in sizing software; the aerodynamic part 8-3 alone does not cover liquid noise.
flanged one piece vport design	one flanged V-port segment valve family is built as a one-piece body with integrally cast flanges, face-to-face per ISA 75.08.02 and IEC 60534-3-2
flanged pressure class envelope	ASME Class 150 and 300 available 1"–32"; ASME Class 600 available 1"–4", PN 10 (DN 200–800), PN 16 (DN 100–800), PN 25 (DN 200–800), PN 40 (DN 25–600), JIS 10K/16K/20K flange drillings offered on the ASME 300 body casting (1"–28")
segment valve size envelope	sizes 1", 1-1/2", 2", 2-1/2", 3", 4", 6", 8", 10", 12", 14", 16", 20", 24", 28", 32" (DN 25 to DN 800), flanged end connections only
temp envelope by bearing seat build	temperature envelope steps with construction: -52 to +260 °C with soft bearings, -52 to +315 °C with metal bearings, and -52 to +425 °C with metal bearings plus high-temperature seats
shutoff class metal soft seat iec	shut-off classification per IEC 60534-4 / ANSI-FCI 70.2: metal seat Class IV with Class V optional under high differential test pressure and 10 x ISO 5208 Rate D; soft seat Class V with Class VI optional
inherent flow characteristic equal percentage	inherent flow characteristic of the flanged V-port segment design is equal percentage
fire safe certification api607	fire-safe design certified to ISO 10497:2010 (API 607, seventh edition)
noise cavitation trim option	a dedicated low-noise / anti-cavitation trim reduces aerodynamic noise and prevents cavitation, offered for 2" (DN 50) and larger valves
reduced cv trim codes	reduced-Cv trims for the DN 25 / 1" valve limit maximum Cv to 0.5 (code C005), 1.5 (C015), 5.0 (C05) and 15.0 (C15)
metal seat construction temp	standard tight metal seat: 316 SS with cobalt-based hard facing seat, nickel-chromium alloy 625 spring, filled-PTFE lipseal / SS Elgiloy spring, rated -52 to +315 °C for general tight-shut-off service, sizes 1"–32" (DN 25–800)
soft seat construction temp	soft seat: 316 SS with PTFE + high-cycle filler in sizes 1"–6", 316 SS with PTFE + 25% carbon insert in sizes 8"–32", nickel-chromium alloy 625 spring, filled-PTFE lipseal back-up and PTFE seat seal, rated -52 to +260 °C for general tight shut-off
non tight metal seat erosive	non-tight metal seat in cobalt-based alloy rated -80 to +425 °C for extremely erosive applications, installed with reversed flow direction
high temp metal seat option	high-temperature metal seat option: 316 SS with cobalt-based hard facing (316 SS with chrome-carbide facing variant), nickel-chromium alloy 625 spring and FKM seat seal, rated -30 to +200 °C for general service
body seat test pressure basis	all valves undergo pressure testing at the factory: body shell test at 1.5 x the valve pressure rating
trim rotation direction	valve trim rotation is clockwise to close
segment material options severe service	segment material options include AISI 329 with hard facing, CG8M with hard facing or chrome-carbide facing, and titanium with ceramic coating or uncoated titanium
rotary emission bearing design	bearings are located inside the valve body giving larger bearing areas, lower bearing loads and longer bearing life, and rotary operation reduces fugitive emissions dramatically compared with a sliding-stem design
segmented design envelope asme	a segmented ball control valve series covers NPS 1 to 16 (DN 25 to 400), one-piece body per ASME B16.34, pressure classes ASME 150/300/600 and PN 10/16/25/40, temperature -50°F to 500°F (-46°C to 260°C), flanged and flangeless end connections
leakage class ansi fci by seat	leakage classification per seat type: resilient seat Class VI and metal seat Class IV, both per ANSI/FCI 70-2 and IEC 60534-4
face to face flanged segment	face-to-face dimensions per ISA 75.08.02 and ASME B16.10 on flanged builds; flangeless version to the manufacturer internal standard; flange drilling per ASME B16.5
rangeability port options 300to1	300:1 rangeability with equal-percentage inherent flow characteristic and three standard V-port options (standard profile, 60° and 30°), plus customized characterization on request
vport profiles throttling range	standard, 60-degree and 30-degree V-port profiles give the characterized throttling range; custom port geometry available on request
top flange iso actuation mount	top flange mounting per EN 1092-1 and ISO 5211 for actuator mounting
body seat stem material options	body ASTM A216 WCB carbon steel, seat options: reinforced PTFE (316L-grade), and metal seats with cobalt-alloy hard facing, chrome carbide, or solid tungsten carbide, stem options: 17-4 PH stainless steel, nitrogen-strengthened XM-19 stainless steel, SMO 254, and super duplex UNS 32760
seat energization differential behavior	a seat spring provides constant force sealing the seat against the segment at low differential pressures; at higher differential pressures optimized seat loading takes over the seal function
splined stem connection control	splined stem-to-segment connection gives efficient torque transmission and precise control with low hysteresis and reduced deadband
pressure temp rating wcb class150	ASME Class 150 WCB carbon-steel body pressure rating (psi at °F): 284 at -20–100°F falling through 200 at 305°F to 79 at 800°F
max shutoff differential size bands	maximum differential pressure for control vs shut-off duty is charted per ASME class and size band: Class 150 charts cover 1"–10" with a separate 12" band, Class 300 charts split 1"–3", 4" and 8", 10" and 12" bands (higher classes in the same bulletin)
cv metal seated table span	metal-seated Cv tables span 0.2 at 1" / 10% open up to 2,870 at the 16" valve (highest tabulated value, upper opening rows read positionally from the %Open grid)
seat temperature limits differential	FKM soft seats are limited to 420°F (216°C) in the differential-pressure charts, with special-material seats to 500°F (260°C)
initial opening table by seat	initial opening percentages with different seats on the flanged V-port segment builds (DN 25 to DN 700): metal seat S/A starts at 14.2% (DN 25 trim variants 10.3–11.9%) falling to 4.4% at DN 700; tight metal seat 1S starts 12.8% (9.3–11.4% mid-range) down to 5.9–6.3% at DN 500–700; soft seat T2 starts 24.1% (16.1–21.1%) down to 7.1%
ra re body rating temp split	body ratings: the internally-standardized (non-IEC face-to-face) execution per ASME Class 300 or PN 40; the IEC face-to-face execution per ASME Class 300 or PN 50/PN 40, with ASME Class 600 or PN 63/PN 100 optional in NPS 1"–4", face-to-face: the internally-standardized execution to the valve-maker internal standard, the IEC execution per IEC/EN 60534-3-2, operating temperatures: internally-standardized execution -40 to +260 °C; IEC execution -50 to +260 °C with soft bearings, -50 to +315 °C with metal bearings in sizes 2"–10", and -50 to +425 °C with metal bearings plus high-temperature seats in sizes 2"–10"
Shell pressure rating	up to 285-740 psi (1960-5100 kPa)
shutoff class	Per ANSI/FCI 70-2, Flexible Metal: Class IV, Rigid Metal: Class IV, Reinforced PTFE Seat: Class VI, Clearance Seat: 5% of max flow when closed
body styles	Flanged or flangeless
Actuator type / construction	Handwheel, Chainwheel, Double-acting and spring-return cylinder actuators, Spring-return diaphragm actuator

範圍與來源備註

rangeability	Rangeability: one OEM states adjustable ratio 100:1 while another states up to 300:1 (spec table 250:1/300:1) - published rangeability differs by manufacturer and must not be generalized to a single number.
inherent flow characteristic	Inherent flow characteristic: OEM pages describe the V-notch as approximately equal-percentage while other engineering sources describe characterized V-ball designs as near-linear - the curve depends on notch geometry and port option, so quote as characterized per design rather than one shape.
soft seat shutoff	Soft-seat shutoff: an OEM page claims zero leakage for soft seals, but ANSI/FCI 70-2 Class VI still permits a small quantified leakage (0.15-0.3 ml/min per a control-valve reference) - the standardized leakage-class wording governs over marketing zero-leak claims.
size pressure envelope	Size/pressure envelope: the tenant entry 3/4-20 inch (DN20-DN300) Class 150-600 sits inside one OEM line listed at 1-20 inch Class 150 and 1-12 inch Class 300 - per-OEM envelopes differ and must not be merged into one claim without tenant confirmation.