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全通徑平板閘閥（through conduit slab）

全通徑平板閘閥滑動單一平板閘板，開啟時留下光滑全通徑——將壓降降至最低，防止漿料與固體在閥腔積聚，這正是管線輸送用途青睞它的原因。產品範圍涵蓋 NPS 2" 至 48"（DN50 至 DN1200），ASME Class 150 至 2500（PN16 至 PN420），閥體為碳鋼、不鏽鋼、合金鋼與雙相不鏽鋼，端接為 RF、BW 或 RTJ，操作為手動、氣動、電動或液動，設計依 API 6D 用於油氣輸送。選型取決於清管作業對全通徑的要求、壓力等級對管線壓力，以及閥體合金對輸送流體的適應性。通用閘閥資料補充了選型框架：關斷而非節流任務（半開閘板會振動並沖蝕）、沿管軸佔用極小空間且全開時幾乎無流阻、全通徑與縮徑孔選項、明桿與暗桿型式（位置指示對有限淨空）、約 2250 psi（15 MPa）以上採壓力自緊閥蓋、高溫用螺紋或密封焊接並堆焊硬面的閥座環、可雙向安裝，以及大口徑操作前平衡壓力的旁通閥。

屬於閘閥系列

最後更新： 2026-11

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系列規格

Nominal valve connection size	NPS 2"~48"(DN50~DN1200）
Pressure class / nominal rating designation	ASME CLASS 150~2500（PN16~PN420）
Valve body material	Carbon steel, Stainless steel, Alloy steel, Duplex stainless steel
End connection types	RF, BW, RTJ
Operation / closure mode	Manual, Pneumatic, Electric, Hydraulic
Design standards	API 6D
applications	Oil & gas transportation
axial footprint	Very little space required along the pipe axis; flow hardly restricted when fully opened
full open flow path	No obstruction in the flow path at full open, resulting in very low flow resistance
duty scope	Shut-off (isolation) duty rather than flow regulation
partial open stability	A partially open gate can vibrate from the fluid flow depending on construction
bypass practice	Large valves are sometimes fitted with a small bypass valve to reduce upstream pressure before operating the main gate
pressure seal bonnet note	Pressure-seal bonnet construction adopted for high pressure service, typically in excess of 2250 psi (15 MPa)
stem patterns note	Rising stems give visual position indication; non-rising stems suit installations with limited vertical space
nonrising stem space note	Non-rising stems used where vertical space is limited
trim material options	Commonly cast iron, cast carbon steel, ductile iron, gunmetal, stainless steel, alloy steels and forged steels
bidirectional flow	Bidirectional - can be installed and used in either flow direction
throttling limit	Not suitable for regulating or throttling flow
seat construction	Seats integral with the body or seat-ring type; rings threaded or pressed in and seal welded (recommended for higher temperature); hard-faced rings available
full port bore	Full-port builds pass a full line-size bore for minimum pressure drop; reduced-port builds have slightly higher drop
osy stem advantage	Outside-screw-and-yoke rising stems keep stem threads out of the flow medium (not subject to corrosion/erosion)
peer size range conduit gate	NPS 1.13/16 –16.3/4 (DN 46-425) NPS 2- 36 (DN 50-900)
peer pressure rating conduit gate	ASME 150 - ASME 2500 API 5000-API 10000
temperature range conduit gate	-150 to 662°F (-101 to 350°C)
peer end connections conduit gate	RF, RTJ as per B16.5 &B16.47 BW, Butt Welded as per B16.25 Hub connection 6B, 6BX as per API6A
conduit gate body one piece	Forged or cast one-piece
conduit gate seat hardfacing	Metal-seated with hardfacing on wedge and Seats
conduit gate secondary seal graphite	Secondary seals in Pure Graphite
conduit gate stem safety features	Anti-Static Device Anti Blow out stem
conduit gate body cavity relief	Relief valve in the body cavity
conduit gate fully piggable	Fully piggable design
conduit gate fail open operation	In normal operation, line fluid fills the cavity and the gate is lifted by the pressure generated from the flow path assisting the actuator spring to open the valve, resulting in a fail-open configuration.
conduit gate rising stem under line pressure	The valve design includes a rising stem which accommodates the upward and downward movements of the gate allowing it to open and close under the line pressure.
conduit gate testing standards	Compliance with API 6D & ISO 5208 & API 598 inspection and testing
conduit gate fire safe certification	Fire safe and fire tested as per API 6FA/ 607
conduit gate fugitive emission standard	Fugitive Emission as per ISO15848
conduit gate api6a psl levels	Product specification levels (PSL 1, 2, 3, 3G and 4)
conduit gate piggable fully open only	Slab through conduit gate valves are piggable in the fully open position and generate pressure drop across the valve equal to the inside diameter of the connecting pipe.
peer design standards conduit gate	Slab through conduit gate valves are designed and manufactured in accordance with API 6D and API 6A standards and specifically for on-off services.
conduit gate top entry inline service	These valves are a top entry design with floating seats, and are serviceable while installed in the flow line.
conduit gate api6d monogram	They are manufactured to API-6D requirements and carry the API-6D monogram audited and issued by the American Petroleum Institute.
conduit gate bore matches pipeline id	The through-conduit design has a smooth, continuous bore that matches the internal diameter of the pipeline when fully open.
conduit gate dbb bidirectional piggable	Both types are full bore, bi-directional, capable of double block and bleed sealing, and ideal for pigging operations.
conduit gate body thermal relief bleed	When body pressure exceeds line pressure from causes such as thermal expansion, the upstream seat is forced back into its recess and the excess pressure in the body is bled between the seat and the gate into the line.
conduit gate double seal sequence	Thus, a double seal is formed; first, a plastic-to-metal seal then metal-to-metal.
conduit gate spring energized floating seats	These valves feature floating metal seat rings equipped with soft face seals, held against the gate by a dynamically energized spring.
conduit gate emergency sealant injection	Should a seat fail, emergency sealant can be pumped directly into a groove on the seat face through body fittings.
conduit gate fire safe graphite option	For added safety, an optional fire-safe design ensures a temporary seal via graphite wire rod and metal-to-metal contact between the seat and gate, even if soft seals are compromised.
conduit gate low emission packing api622	API-622 qualified low-emission braided graphite packing.
conduit gate packing in service adjustment	A unique internal retainer allows in-service adjustment while the valve is under pressure, significantly extending packing life and eliminating downtime.
conduit gate enp surface coating	A heavy 3 Mil ENP coating protects surfaces from damage and corrosion.
peer size range tcsgv	4"-30" (And more upon request)
peer pressure class tcsgv	ASME B16.34 150# to 1500#
peer seating material tcsgv	Carbon steel ENP plated (as standard)
peer design standard conduit gate asme8	API 6D - ASME VIII-1/2
conduit gate isolation features dbb dib	API 6D Isolation Features: DBB-DIB_1-Self relieving-Block and bleed
conduit gate seat primary metal secondary soft	Seat: Primary metal - secondary soft
conduit gate pressure envelope oring graphite	Pressure Envelope: o-ring and fire safe graphite
conduit gate drain vent grease fittings	Fittings: Drain - Vent, Stem and seat grease injectors
special features	Through conduit valve type to minimize pressure drops, Prevents accumulation of external materials such as slurries into the valve cavity

範圍與來源備註

bonnet construction	Bonnet construction: the referenced pressure-seal bonnet threshold (typically above 2250 psi / 15 MPa) implies bolted-bonnet executions below that pressure, while the tenant range spans ASME Class 150 to 2500 - the tenant upper band relies on pressure-seal builds not itemized per class.
bore flow framing	Bore/flow framing: generic references describe full-port builds as having no obstruction in the flow path, while the tenant page does not state whether all sizes are full port - reduced-port executions would carry slightly higher pressure drop.
stem pattern split	Stem pattern split: rising stems give visual position indication and non-rising stems save vertical space, but the tenant operation list (manual/pneumatic/electric/hydraulic) does not break out which stem pattern each actuation option uses.