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풀 리프트 안전밸브

풀 리프트 안전밸브는 설정 압력에 도달하면 완전히 팝 오픈하여 전체 오리피스 면적을 방출하므로, 보일러·리시버·용기 주변의 압축성 또는 이상 유체 서비스에서 축적 압력이 빠르게 소멸합니다. 범위는 스프링 하중 사양으로 주철, WCB, SS304 또는 SS316 바디, 2Cr13, SS304 또는 SS316 트림 세트(노즐, 조정 링, 디스크, 가이드 슬리브, 스템), 탄소강 보닛 및 캡, 강재 스프링, 2Cr13 조정 볼트입니다. 작동 압력은 PN1.6~PN4.0 및 Class 150~Class 300에 NPT, RF 또는 RTJ 단자입니다. 설계는 ASME 25.3과 함께 API 520/521/526/527 릴리프 시리즈를 따르며, 페이스 투 페이스는 ASME B16.10, EN 558-1 또는 DIN 3202, 플랜지는 ASME B16.5, DIN 2543/2545 또는 EN 12627, 시험은 API 598 / DIN 323입니다. 작동은 협소한 마진 위에 놓입니다: 대략 10% 과압(코드 기준 3%~21%)이 풀 리프트를 확보하고, -4%~-20% 블로우다운이 재착석점을 결정하며, 시머 — 설정 압력의 90~95% 근처에서 시작되는 시트-디스크 간 가청 누출 — 를 피하려면 작동 압력이 재착석점 아래에 있어야 합니다. 수백 헤르츠에 이를 수 있는 채터(플러그-시트 고속 진동)는 과도한 입구 손실(네임플레이트 용량에서 누적 비회복 입구 손실이 설정 압력의 3% 이내) 또는 과대 선정에서 비롯되며 시트 손상, 스프링 피로, 스템 갈링으로 나타납니다; API 527은 설정 압력의 90%에서 메탈 시트 누출을 상한하고 API 526 레터 오리피스 D~T가 면적 선정을 프레임합니다. 선정은 작동 압력 밴드에 대한 설정 압력, 유체에 대한 시트 및 노즐 재질, 라인의 나사 또는 플랜지 단자에 따라 결정됩니다.

다음 패밀리에 속함: 안전밸브 패밀리

최종 업데이트: 2026-11

견적 요청

패밀리 사양

Set-pressure range	0.1-10 MPa (0.1-2 at class 150; 1.6-5 at class 300; 3.2-10 at class 600)
Nominal valve connection size	DN32–DN150
Valve body material	Cast Iron, WCB, SS304, SS316
Nozzle Materials	2Cr13, SS304, SS316
Disc Materials	2Cr13, SS304, SS316
End connection types	NPT, RF, RTJ
Service temperature range	≤300°C
Design standards	ASME 25.3, API 520, API 521, API 526, API 527
Inspection and pressure-test standards	API 598, DIN 323
Face-to-face dimensional standard	ASME B16.10, EN558-1, DIN 3202
adjusting ring materials	2Cr13, SS304, SS316
guide sleeve materials	2Cr13, SS304, SS316
Bonnet material	Carbon Steel
spring materials	Steel
Stem material	2Cr13, SS304, SS316
adjusting bolt materials	2Cr13
cap materials	Carbon Steel
Working pressure (source-defined)	PN1.6, PN2.5, PN4.0, Class 150 to Class 300
Flange standards	ASME B16.5, DIN 2543, DIN 2545, EN 12627
overpressure allowance 10pct full lift	ASME/API practice allows roughly 10% overpressure for valves on unfired systems so the pop-action valve can achieve full lift and rated capacity; the huddling chamber assists the lift effort
overpressure typical range leser	Overpressure is usually expressed as a percentage of set pressure; a typical value is 10%, ranging between 3% and 21% depending on the code and application
blowdown definition crosby	Blowdown is the difference between the set pressure and the closing-point (reseat) pressure, expressed as a percentage of set pressure; where the closing point sits is determined by the control-chamber design
blowdown typical values leser	Typical blowdown values defined in codes and standards are -7% and -10%, ranging from -4% to -20% depending on the code and service (steam, gas or liquid)
operating margin vs blowdown crosby m11	Operating pressure must stay below the reseating pressure: set at 100 psig with 7% blowdown the valve closes at 93 psig, so operation must remain below 93 psig to prevent leakage or flow from a partially open valve
inlet loss 3pct rule crosby	Inlet piping rule: the cumulative total of all non-recoverable inlet losses shall not exceed 3% of the valve set pressure, evaluated at nameplate capacity corrected for the flowing fluid; upstream system flow characteristics govern
chatter definition and causes valfonta	Chatter is the rapid oscillation of the plug on the valve seat - not ordinary vibration - with the moving component repeatedly striking the metal seat at frequencies that can reach hundreds of hertz; main drivers are excessive inlet-pipe pressure loss, oversizing and too-narrow blowdown margin, with seat/plug deformation, spring fatigue and stem galling as the damage modes
chatter cause summary projectmaterials	Chatter is rapid opening and closing of the valve disc, caused by excessive inlet pressure drop (over 3% of set pressure) or an oversized valve; simmer on spring-loaded valves begins at approximately 90-95% of set pressure
simmer definition crosby	Simmer is the audible or visible escape of fluid between the seat and disc at an inlet static pressure below the popping pressure and at no measurable capacity; it applies to safety or safety relief valves on compressible-fluid service
api527 seat leakage and api526 orifice	API 527 seat-tightness testing applies 90% of set pressure and limits metal-seated gas valves to 40 SCFH air up to 1,000 psig, and 0.60 SCFH air per inch of orifice diameter above 1,000 psig, while soft-seated valves must show zero leakage; API 526 standardizes orifice sizes by letter designation D through T, selected as the next larger standard orifice after the API 520 Part I required area
adjusting ring	2Cr13, SS304, SS316
guide sleeve	2Cr13, SS304, SS316
adjusting bolt	2Cr13
end connection	NPT, RF, RTJ
end connection dimension	ASME B16.5, DIN 2543, DIN 2545, EN 12627

범위·출처 비고

overpressure wording	Overpressure wording: Crosby handbook gives the general 10% allowance for valves on unfired systems, while LESER states the code range spans 3%-21% by code and application; the page should quote 10% as typical, not as a universal limit.