Safety valve A49H-4

 A49H-40 main valve is mainly used in power station boilers, pressure vessels, temperature and pressure reduction device used to prevent the pressure exceeds the allowable maximum pressure to ensure the safe operation of equipment. Two, A49H-40 Description of the main valve structures 1, when the medium pressure rises to the set pressure, impulse valve is opened, the main valve of the medium into the piston chamber from the pulse tube, push the piston drops, the valve opens automatically when When the impulse valve is closed, the valve and turn off automatically. 2, the sealing surface with a cobalt-based chromium-nickel stainless steel made valve heat treatment to improve the wear resistance and erosion resistance. Installation instructions 1, the valve must be installed vertically at the highest position of the device. 2, the main valve is fastened to the seat, stand to bear anti seat force generated when the main valve exhaust. 3, exhaust pipe hanger should be special, exhaust pipe weight can not be applied to the main valve, the main valve and flange connection between the exhaust pipe should eliminate any additional prestressing. 4, the lowest point of the exhaust pipe should be considered hydrophobic, in order to avoid water hammer when the exhaust. Three, A49H-40 main valve parts material NO. Part Name A49H-40-type material A49H-40-type material A49H-40-type material 1 Body WCB ZG1Cr18Ni8Ti, 304 CF8M 2 seat 2Cr13 1Cr18Ni8Ti 316 3 adjusting ring 2Cr13 1Cr18Ni8Ti 0Cr18Ni12Mo2Ti 4 valve 2Cr13 1Cr18Ni8Ti 316 5 kick plate 2Cr13 1Cr18Ni8Ti 316 6 bellows 3043043167 guide sleeve 2Cr13 1Cr18Ni8Ti 0Cr18Ni12Mo2Ti 8 bonnet ZG230-450 ZG230-450 ZG230-450 9 spring 50CrVA 50CrVA 50CrVA coated plastic coated with fluorine fluorine plastic three, A49H-40 main safety valve connection size: Model nominal diameter DN size L L1 L2 HD D1 D2 b DN' D'D1' D2' b'A49H-40 150 220 230 240 486 300 250 204 30 200 360 310 278 34 A49H-40 200 270 295 330 615 375 320 260 38 300 485 430 390 40 A49H-40 250 300 350 370 646 445 385 313 ??42 350 550 490 450 44