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패러렐 슬라이드 게이트 밸브

패러렐 슬라이드 게이트 밸브는 위치적으로 밀폐합니다: 스프링이 두 개의 평행 차단 부재를 서로 눌러 저압 착석을 만들고, 이후 상승하는 관내 압력이 부재들을 시트쪽으로 밀어 밀폐력이 유체 압력과 함께 커집니다 — 스팀 및 급수 배관 같은 고압·고온 서비스를 겨냥한 자기 강화형 밀폐입니다. 범위는 NPS 2"~88"(DN50~DN2200), Class 300~4500(PN25~PN760)으로, 탄소강·합금강·듀플렉스 스테인리스 바디, RF·BW·RTJ 단자 접속, 수동·공압·전동·유압 조작을 제공합니다. 이 설계는 세 가지 특정 이점을 삽니다: 평면 시트 위를 미끄러지는 평행 디스크는 고온 정지 후 웨지처럼 끼이는 열 바인딩이 발생하지 않으므로, 잦은 열 사이클이 있는 고온 스팀 배관이 정확히 이 고장 모드를 제거하기 위해 이 형식을 사용합니다; 웨징으로 인한 응착이 없어 작동 토크가 낮게 유지되어 액추에이터 용량 산정이 쉬워집니다; 그리고 고등급에서 프레셔 시일 보닛이 관내 압력과 같은 방식으로 시트 밀폐를 강화합니다 — 밀폐력이 차압과 함께 커지며, 디스크 스프링 또는 내부 스프레더가 실질적인 저차압 밀폐 한계를 결정합니다. 엄격한 온-오프 차단기입니다: 부분 개도 상태로 두면 평면 시트가 침식되고 고주파 디스크 채터가 발생하므로 유량 제어에는 별도의 조절 밸브가 필요하고, 갇힌 고형물이나 배관 변형으로 틀어진 시트는 디스크를 시트면에서 떼어 놓습니다 — 최종 폐쇄 전에 라인을 플러싱하고 배관 정렬을 유지하십시오. 정비는 작업장 친화적입니다: 특수 공구 없이 분해하고, 디스크 스프링을 교체하고, 시트면을 래핑 또는 재생하고, 글랜드 압축을 적정하게 유지하고, 스템 나사산에 그리스를 바르고, 상시 개방 또는 상시 폐쇄 시트에 침착물이 쌓이지 않도록 주기적으로 밸브를 작동시킵니다. 수직 여유가 허용되고 위치 표시가 중요하면 라이징 스템, 협소하거나 지하 설치에는 논 라이징 스템을 선택하십시오. 기밀성은 API 598(쉘, 차단, 백시트)로 증명되고 ISO 5208 / EN 12266-1이 유럽 프레임입니다; API 600은 볼트 체결 보닛 공정 차단 밸브를 규율하고, API 6D는 화재 시험, 사워 서비스, 사이클링, API 600 프레임이 요구하지 않는 자동 바디 캐비티 압력 방출 등 파이프라인 특유의 임무를 추가합니다. 선정은 스팀 조건에 대한 등급, 유체에 대한 바디 합금, 배관 사양에 대한 단자 접속에 따라 결정됩니다.

다음 패밀리에 속함: 게이트 밸브 패밀리

최종 업데이트: 2026-11

견적 요청

패밀리 사양

Nominal valve connection size	NPS 2"~88"(DN50~DN2200)
Pressure class / nominal rating designation	Class 300~4500（PN25~PN760）
Pressure class / nominal rating designation	300~4500（PN25~PN760）
Valve body material	Carbon steel, Alloy steel, Duplex stainless steel
End connection types	RF, BW, RTJ
Operation / closure mode	Manual, Pneumatic, Electric, Hydraulic
applications	High pressure and high temperature services such as steam and feedwater
selection thermal binding elimination vs wedge	Parallel slide gate valves avoid thermal binding because the two discs slide parallel to flat seats instead of being forced between inclined seats, so body contraction during shutdown cannot wedge the closure member tight. This makes the design the usual choice for high-temperature steam lines that undergo frequent thermal cycles.
selection pressure assisted sealing low deltap basis	Sealing force comes from line pressure acting on the downstream disc, so seat tightness improves as differential pressure rises. At low pressure the disc springs or internal spreaders alone provide the baseline seat contact, which sets the practical low-differential-pressure sealing limit of the design.
selection no wedging seizure and torque	Because the discs do not wedge, opening and closing torque stays low and there is no wedging action to seize the valve after thermal expansion. This reduces actuator sizing and lowers seat wear over repeated operating cycles.
selection pressure seal bonnet self energizing	For high-pressure classes the bonnet is typically of pressure-seal type: internal pressure forces the gasket more tightly into its seat, so bonnet sealing improves as pressure rises. This matches the self-reinforcing behavior of the parallel-disc seat seal.
selection hp steam water isolation positioning	The parallel slide gate valve is an established valve type for high-pressure steam and high-pressure water isolation duty, offered in ratings from ANSI 150 to ANSI 1500 with tight shut-off obtained from line pressure rather than mechanical wedging.
selection catalog size class envelope example	A typical commercial parallel slide gate valve envelope runs from small sizes up to DN900, in ANSI class 150 to 600 with flanged or butt-welded ends. Wider class ranges are offered by power-plant specialists, so class availability must be confirmed per manufacturer.
failure throttling chatter seat erosion	Parallel slide gate valves are on-off isolation devices only. Holding the valve partially open for throttling produces turbulence across the nearly closed flat seats, eroding the seat faces and driving high-frequency disc chatter, so a separate regulating valve is required where flow control is needed.
failure trapped solids seat leakage	The flat, closely finished parallel seats are vulnerable to debris: suspended solids trapped between the faces hold the discs off the seat and cause leakage, and piping loads that distort the seats have the same effect. Line flushing before final closure and correct piping alignment are the preventive measures.
failure thermal binding wedge mechanism contrast	Thermal binding, the classic wedge-gate failure after a hot shutdown, occurs when the cooling body contracts and clamps the wedge between the seats, seizing the valve or buckling the stem. The parallel-disc design is selected precisely to remove this failure mode from high-temperature service.
installation routine maintenance and exercise	Routine care consists of checking gland packing compression, lubricating the stem threads, and periodically cycling (exercising) the valve so deposits cannot build up on the seats and disc edges - an important regime for valves that normally stand open or closed for long periods.
installation seat refurbishment workshop tooling	The valve can be disassembled for inspection without special equipment: seat faces can be examined, internal disc springs replaced, and sealing surfaces restored with standard workshop tooling, which keeps lapping or seat refurbishment practical in normal maintenance.
installation stem choice vs vertical clearance	Rising-stem versions give clear visual open/closed position indication but need vertical space above the valve; non-rising-stem versions keep the stem height fixed and suit confined installations such as underground vaults and cramped pipe racks, at the cost of less obvious position indication.
standards api598 closure testing reference	Seat (closure) tightness for steel gate valves of this family is generally proven per API 598 as referenced by the valve specification, with shell, closure and, where fitted, backseat tests. ISO 5208 / EN 12266-1 rate classes are the equivalent European acceptance frame.
standards api600 vs api6d scope	API 600 governs bolted-bonnet steel gate valves for refinery and process isolation, while API 6D is the pipeline-valve standard covering gate valves for transportation systems and adds pipeline-specific requirements such as fire testing, sour service and operational cycling. Project specifications may require one or both.
standards api6d cavity pressure relief	Where a gate valve is built to API 6D for pipeline service, the body cavity must be able to relieve trapped overpressure automatically in addition to the normal shell and seat tests - a requirement not present in basic API 600 process-isolation valves.
peer size range severe service psg	4 – 36"
peer pressure class severe service psg	ASME / ANSI Class 150 – 4500
peer body materials severe service psg	Carbon steel (A216 WCB) – standard Alloy steel (A217 WC9, A217 C12A) – standard Stainless steel (A351 CF8M) – standard
peer compliance nuclear silver psg	ASME B16.34 PED Nuclear ASME III Class 1, 2 and 3 Nuclear Safety Related – 10CFR50 Appendix B SIL
peer end connection default psg	Buttweld – standard Other end connections available upon request
psg bidirectional zero leakage shutoff	Bi-directional, zero-leakage shutoff
psg disc seat carbide overlay	The valve discs and seats have been overlaid with the same carbide overlay (68-70 RC)
psg seat lapping vacuum tight	and are lapped to achieve a bubble-tight seal under all pressure conditions, including vacuum.
psg web guide parallel discs	The web guide (which is also carbide overlayed) ensures the discs are kept parallel, whether the valve is in the open or closed position.
psg wear honing not galling	As the valve is cycled under differential pressure, the extremely hard surfaces continually hone and polish each other instead of scratching and galling.
psg pressure seal bonnet graphite composite	The pressure seal bonnet has been designed with a graphite composite seal.
psg bonnet bolting cold preload	The bonnet has sufficient mechanical bolting to ensure the seal does not relax during periods when the system is not pressurized.
psg stem gland hardfaced polished	The stem and gland are hardfaced and polished.
psg backseat chrome carbide	The back seat is coated with chrome carbide (typical hardness 68-70 RC) and polished to achieve a bubble tight seal.
peer size range double disc psg	NPS 2 1/2 to 24 DN 65 to 600
peer pressure class double disc psg	150 to 1500 PN 25 to 260
peer seating material double disc psg	Seating Material: Metal
double disc design service envelope	this exclusive disk and wedge design resists effects of extreme temperatures, gross thermal transients, high and low differential pressures, and dual-phase fluids.
double disc bonnet internal access	Increased plant and personnel safety is made possible by bonnet design, allowing easy access to valve internals while minimizing radiation exposure
peer standards nuclear double disc psg	ASME B16.34 ASME Section III
peer actuation configs double disc psg	Motor Actuated Motor Operator Hydraulic Actuated Hydraulic Operator
psg disc cooldown no stress	There is no mechanical stress exerted between the discs or problems associated with the cooldown of the fluid.
sealing principle	Positional seal, Line pressure as sealing force
special features	Spring between the two closure members provides an initial seal during low pressure conditions, Higher medium pressure creates the primary seal, the higher the medium pressure the better the sealing performance

범위·출처 비고

type level parameters	A Chinese vendor page under the same English name lists Flexible/Solid Wedge materials and 1.0-2.5 MPa water/sewage duty, while OEM references position the parallel slide type as high-pressure steam/water isolation up to ANSI 1500 - the vendor page appears to describe a low-pressure slide-gate family; its parameters are product-specific, not type-level.
sealing direction framing differs by construction	Sealing-direction framing differs by construction: one source characterizes API 600 gate valves as unidirectional sealing relying on bolted-bonnet pre-load, while parallel-slide references describe line-pressure-assisted bidirectional sealing - the framings reflect different gate constructions under the standards, not one sealing rule.
temperature range	Temperature envelope differs materially between catalog sources (-196 to 593 C on one catalog versus -29 to 425 C on another); the tenant entry quotes no single type-level envelope and per-material limits must be confirmed per manufacturer.