Prsov和prv有啥子区别

18408296080 · 发表于 2018-8-21 21:13:47

Prsov和prv有啥子区别

吗耶 · 发表于 2018-8-22 09:57:28

Bleed Pressure Regulator Valve (PRV) (Ref. Fig. Bleed Pressure Regulator Valve ( PRV ) SHEET 1) (1) The PRV is a 4 in. dia. butterfly-type valve, normally spring-loaded closed in absence of upstream pressure. A minimum upstream pressure of 8 psig is necessary to open the valve. The PRV pneumatically regulates the downstream pressure to 44 plus or minus 1.75 psig. It closes automatically in the following cases : · overtemperature downstream of the precooler exchanger (257 plus or minus 3) deg.C (60 s delay), · overpressure downstream of the PRV (57 plus or minus 3) psig (15 s delay), · ambient overheat in pylon/wing/fuselage ducts surrounding areas, · APU bleed valve not closed, · corresponding starter valve not closed. It is controlled in closed position by crew action on: · ENG FIRE pushbutton switch · ENG BLEED pushbutton switch. The PRV closes pneumatically in case of impending reverse flow to the engine. The Overpressure Valve (OPV) installed downstream of the PRV protects the system against damage if overpressure occurs. A sense line (1/4 in. dia.) connects the PRV to the HP Bleed Valve in order to close the HP Bleed Valve if the PRV is closed or controlled to close. The thermal fuse installed in the valve body causes the valve to close at 450 plus or minus 25 deg.C.

吗耶 · 发表于 2018-8-22 09:59:44

The two PRSOVs have the pressure regulation function: · The first PRSOV controls the anti-icing supply pressure, when the upstream pressure is sufficient to for regulation, to get a downstream of between 83 psi (5.72 bar) and 93 psi (6.41 bar). · The second PRSOV controls the anti-icing supply pressure, when its upstream pressure is sufficient for regulation, to get an interface pressure of between 65 psi (4.48 bar) and 71 psi (4.90 bar).

吗耶 · 发表于 2018-8-22 10:01:39

prv在36章节。prsov在30章节

吗耶 · 发表于 2018-8-22 10:06:18

prv用于发动机的引气和防止反流。超温保护

吗耶 · 发表于 2018-8-22 10:11:24

prsov用于防冰的引气控制

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[70-80 CFM56] Prsov和prv有啥子区别

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