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파일럿 작동 안전밸브
파일럿 작동 안전밸브는 메인 밸브와 외부 파일럿을 짝지습니다: 파일럿이 관내 압력을 감지하고 메인 밸브를 제어하여, 설정 압력에서 짧은 블로우다운으로 풀 리프트를 얻으면서 그 이하에서는 동적으로 기밀을 유지합니다 — 따라서 작동 압력이 시머나 유체 손실 없이 설정 압력에 가깝게 운전될 수 있습니다. 대표적인 등급 범위는 DN25~DN200(1" x 2"~8" x 10" 입구 x 출구), ANSI Class 150~600 / PN16~PN100의 WCB, CF8 또는 CF8M 바디이며, 설정 압력 창은 견적 시 요구 용량 및 파일럿 선정에 대해 확인됩니다. 파일럿은 팝 액션 또는 모듈레이팅형이며 현장에서 선택 가능하고, 모듈레이팅형은 더 높은 중첩 배압을 견딥니다. 플랜지(RF) 단자입니다. 마진을 만드는 것은 파일럿 아키텍처입니다: 돔 면적이 시트 면적보다 크므로 메인 밸브는 스프링 밸브가 이미 시머를 일으키는 영역에서도 설정 압력의 5% 이내(98% 시트 기밀)로 기밀을 유지하고, 팝 액션 파일럿은 약 1% 과압에서 개방하여 97%에서 재착석(85%까지 조정 가능, 블로우다운 -3%~-15%), 모듈레이팅 파일럿은 수요를 추적하여 설정 압력의 110%에서 풀 리프트에 도달하며, 70% — 예외적으로 95% — 까지의 배압이 백플로우 프리벤터로 보상됩니다. 지배적인 고장 모드는 파일럿 감지 라인입니다: 입자 함유 또는 결정화 유체가 약 10 mm 보어를 막으므로(클린 서비스로 한정, 코킹 및 중합 주의), 급격한 기동 램프는 돔의 평형을 깨고 가짜 리프트를 유발할 수 있습니다. 설치는 공급 라인에 차단 밸브 없이 3/8인치 등가 면적의 원격 픽업을 100피트까지 유지하고, 현장 시험 접속부가 서비스 중 기능 시험을 허용합니다. ASME VIII UG-126(b)는 파일럿이 자기 작동하고 메인 밸브가 풀 용량에서 폐개(fail-open)임을 요구합니다. 선정은 작동-설정 압력 비율, 배압, 유체, 파일럿 액션에 따라 결정됩니다.
다음 패밀리에 속함: 안전밸브 패밀리
최종 업데이트: 2026-11
패밀리 사양
| Pressure class / nominal rating designation | ANSI Class 150-600 / PN16-PN100 |
|---|---|
| Nominal valve connection size | DN25-DN200 (1in x 2in - 8in x 10in inlet x outlet) |
| Valve body material | WCB, CF8, CF8M |
| End connection types | flange (RF) |
| Service temperature range | -162 to 320°C |
| pilot type | pop-action or modulating; field-selectable |
| design note | main valve + external pilot; full-lift at set pressure with short blowdown |
| operating pressure ratio vs spring limit | Spring-loaded valves struggle to close completely above roughly 90% of set pressure; the pilot-operated main valve closes with a dome area larger than the seat area so closing force exceeds opening force, letting system operating pressure run within 5% of set pressure without increased seat leakage - the standard choice for high operating-to-set ratios |
| pop action reseat and adjustable blowdown | Pop-action pilot: opens at about 1% overpressure, closes at 97% of set pressure adjustable down to 85%, with blowdown adjustable between -3% and -15% above the API standard; modulated-closure pilots hold blowdown to max 7% |
| modulating vs pop pilot principle | Pop-action fully empties the main-valve dome for snap full lift; in modulate action the dome is only partially emptied, with the extent of emptying determined by the inlet pressure, so the main valve modulates with the relief demand |
| modulating partial opening capacity control | Modulating diaphragm-pilot execution: the valve opens further as process pressure rises and reaches full lift at 110% of set (High Gain option by 105%); the pilot is the nonflowing type - with the main valve relieving at steady pressure, no process fluid flows through the pilot |
| back pressure tolerance | Pilot actuation is differential, so back-pressure tolerance is high: pilot-operated safety valves can consistently compensate 70% back pressure and in certain cases run at a 95% back-pressure ratio; operability stays unaffected up to 70% of set pressure provided a backflow preventer is used whenever back pressure can exceed inlet pressure |
| seat tightness high operating ratio | Pilot-operated SRVs can achieve seat tightness up to 98% of set pressure for both the main valve and the pilot valve - the basis for running close to set pressure without simmer |
| posv definition | A pilot-operated safety relief valve is a pressure relief valve in which the major relieving device (main valve) is combined with and controlled by a self-actuated auxiliary pressure relief valve called a pilot valve |
| asme ug 126b pilot requirements | ASME Code Sec. VIII UG-126(b) permits pilot-operated pressure relief valves provided the pilot is self-actuated and the main valve opens automatically at not over set pressure and discharges full rated capacity even if some essential part of the pilot fails - the fail-open requirement |
| pilot blowdown short adjustment | The pilot portion of some pilot-operated valves can be set at blowdowns as short as 2% - far tighter than direct-spring pop valves |
| sensing line blockage failure mode | The pilot sensing (pressure-tap) line is the governing failure mode: media containing particles or prone to crystallization can plug the roughly ten-millimeter line, after which the safety valve can no longer perform its intended function; pilot-operated valves are supplied with filters and generally recommended for relatively clean service |
| dirty service limits | Pilot-operated valves should not be employed in abrasive or dirty service, where coking, polymerization or corrosion of wetted pilot parts can occur, or where the lading fluid can freeze or condense at ambient temperature; for severe dirty service where interconnecting tubing can clog, a pilot-operated SRV might not be the best fit |
| rapid pressure ramp false lift | During plant start-up with an extremely rapid system-pressure ramp rate, the dome area may not equalize with the same inlet pressure, resulting in insufficient closing force - a pilot-operated-specific false-lift mode |
| soft seal and temperature limits pilot | Pilot soft seals (O-rings) bound the application envelope: at temperatures of 200 °C and above the safety valve manufacturer should be consulted |
| sensing line remote pickup sizing rules | Installation rule for remote pressure pickup: piping must have the equivalent flow area of 3/8 in tubing for lengths up to 100 feet, longer runs require factory consultation; a block valve in the remote pilot supply line is not recommended and, if used, must be opened before pressurizing the main valve |
| field test connection in service | A field test connection allows operators to functionally test the pilot-operated SRV while it remains in service - a maintenance advantage over direct spring valves that must be pulled for bench testing |
| oem maintenance resources posv toolbox | OEM maintenance reference: the valve manufacturer publishes a dedicated maintenance toolbox for pilot-operated types 811 (pop action) and 821 (modulating) with repair guidance to the manufacturer quality standards |
| set pressure range example diaphragm pilot | OEM example envelope (pilot-operated relief valve with diaphragm pilot): set pressure range 15 psig to 740 psig; reseat pressure defined as the supply pressure where the dome pressure increases to 75% of supply pressure - an industry-reference anchor, not a tenant supply claim |
| Source 1 — orifice area range | effective orifice areas of 0.128 through 45.664 inches |
| Source 1 — inlet size range | valve inlet sizes 1-inch through 8-inch |
| Source 1 — Set-pressure range | set pressures from 15 to 3,705 psig (1 to 260 barg) |
| Source 1 — continuous temperature range | Continuous service temperatures from -50°F to +450°F |
| Source 1 — nonflowing pilot principle | with the non-flowing pilot provides highly reliable system overpressure protection |
| Source 1 — dirty service pilot design | The pilot is a non-flowing design minimizing the entry of dirt and the accumulation of hydrates |
| Source 1 — pilot supply filtration | Inline tubing external filter is also available |
| Source 1 — vertical pilot mounting | Consistent set pressure and blowdown are assured compared to horizontally mounted pilots that are erratic |
| Source 1 — orifice nozzle replacement | The orifice size may be changed by replacing a single component |
| Source 1 — external blowdown adjustment | Adjustable blowdown is external, reducing time and cost-consuming expenditures of valve removal |
| Source 1 — replaceable soft seat | With a replaceable soft seat, expensive parts and time-consuming lapping of metal seats are no longer necessary |
| Source 1 — asme capacity verification | capacity is assured by an independent third party, the ASME National Board Laboratory in Columbus, Ohio |
| Source 1 — operating ratio capability | The valve can be set within 5% of system operating pressure allowing the process to be maintained at close tolerance without valve leakage |
| Source 1 — typical applications | for Gas Compressors, Pressure Vessels, Cold Box Storage, Meter Runs, Gas Plants, Pipelines, and Transmission Stations |
| Source 2 — low pressure vacuum protection | provide safe, dependable, and accurate low pressure and/or vacuum protection |
| Source 2 — api2000 sealing | Seals in accordance with API 2000 requirements for Pilot Operated Relief Valves |
| Source 2 — rated flow overpressure | Rated flow at 10% overpressure provides the ability to operate closer to the tank MAWP, increasing the operating range of the process |
| Source 2 — seat action flexibility | Flexibility in terms of film or o-ring seat and snap or modulating action allows product customization to specific application requirements |
| Source 2 — vacuum breaker variant | The Model 1662A incorporates a vacuum breaker. |
| Source 2 — Nominal valve connection size | Sizes: 2” through 12” (50-300mm) |
| Source 2 — pressure settings | Pressure Settings: from 7.0* InWC to 15 psig |
| Source 2 — vacuum settings | Vacuum Settings: 7.0 InWC to 12 psig |
| Source 2 — standard body materials | Standard Body Materials: Carbon Steel (WCB/CS), Stainless Steel (CF8M/316), Aluminum (356) |
| Source 2 — supply media temperature range | Supply Media Temperature Range: -320° F to 300° F |
| Source 2 — drilling classes | 150# ANSI, PN10, PN16, JIS drilling classes available |
| Source 2 — pilot accessories | Pilot exhaust piped to discharge header, Field test connection, Manual blow down, Conical film seat pallet, Remote sense pickup, Pilot supply filter |
| Source 3 — Nominal valve connection size | Size 1/2” to 20” |
| Source 3 — Pressure Rating | Pressure Rating 150# x 150# to 2500# x 300# |
| Source 3 — End connection types | End Connection Flange End, Screwed End, Tri-Clover End |
| Source 3 — seat options | Seat Metal Seat / Soft Seat |
| Source 3 — orifice standard | Orifice As per API 520 |
| Source 3 — blowdown and overpressure | Blow Down <10% of Set Pressure, Over Pressure >10% of Set Pressure |
| Source 3 — Valve body material | Material Carbon steel, Stainless steel, Duplex-SS, nickel-molybdenum alloy, Alloy-20, nickel-copper alloy |
| Source 3 — pilot sensing design | Design - High Pressure, Semi- Nozzle/ Full- Nozzle, Piston Sensing Pilot |
| Source 3 — type options | Type Conventional, Balanced Bellow, Balance Piston, Pilot Operated, PTFE Lined |
| Source 4 — seat design options | Soft seat design: Provides repeatable bubble-tight performance before and after each relief cycle, Metal-to-metal seat design: Provides pilot valve performance in high temperature service |
| Source 4 — balanced design principle | Balanced design: Lift unaffected by back pressure; no expensive and fragile bellows required to balance against high back pressure |
| Source 4 — full lift dot maop capability | Full lift at set pressure: No overpressure required for full lift; allows D.O.T. installation to be set higher than Maximum Allowable Operating Pressure (MAOP) when pop action is used |
| Source 4 — replaceable seats and seals | Replaceable soft seats and seals: All seats and seals are renewable easily and quickly; no expensive, time-consuming seat lapping required |
| Source 4 — api526 center to face dimensions | API 526 direct spring center-to-face dimensions available for Series 200, 400, 500 and 800 pilots eliminating the need for piping modifications during upgrades |
| Source 4 — pop action cryogenic benefit | Pop action available: No main valve throttling, which helps prevent freeze-ups in cryogenic or refrigerant type services |
| Source 4 — modulating action benefits | Modulating action available: Significantly cut product loss per relief situation; reduce environmental pollution; avoid oversizing consequences; not as sensitive to inlet pressure losses as pop action |
범위·출처 비고
| back pressure capability tension | Back-pressure capability tension: the page spec states superimposed back pressure up to ~50% of set, while OEM documents state 70% consistent compensation (LESER, 95% in certain cases; Crosby 70% with backflow preventer); the ~50% figure should be owner-reviewed against per-configuration OEM limits. |
|---|---|
| pilot closure figures | Generic vendor pages describe pilot closure near 90% of set pressure; OEM pop-action figures are 97% (adjustable to 85%, blowdown -3% to -15%) - the OEM figures govern; generic-website numbers were excluded from this page. |
| set pressure envelope | Emerson Series 400 shows a 15-740 psig (about 1-51 barg) set-pressure envelope, so the page 0.1-10 MPa range is a tenant selection, not an industry ceiling; temperature envelope (-162 to 320 °C) sits against soft-seal limits where the manufacturer must be consulted at 200 °C and above - quote per configuration. |
주문·서류
서류
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견적
견적에 바로 쓸 수 있는 문의에는 다음을 명시합니다: 공칭 구경과 압력 정격, 바디·시트 재질 선호, 접속 방식, 조작 방식, 온도를 포함한 사용 유체. 이 페이지의 전형값은 벤치마크 참조 범위입니다; 구속력 있는 값은 견적 시 확정됩니다.
샘플·공급
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보관·운송
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자주 묻는 질문
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