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產品名稱：	主安全閥
產品型號：	A49Y-PW5414V DN100
產品報價：
產品特點：	本裝置供蒸汽工作壓力為P﹦13.72MPa；t≤540℃的電站鍋爐上使用，防止鍋爐內介質壓力超過允許值，以保證鍋爐安全運行。主安全閥A49Y-PW5414VDN100應與沖量安全閥A49Y-PW5414VDN20配套安裝使用。

A49Y-PW5414V DN100主安全閥的詳細資料：

A49Y-PW5414V DN100主安全閥

Description:

主要零件材料 Main part material
主安全閥 Main safety valve
件號 Part number	零件名稱 Name of parts	材料 Material
1	下閥體 Nether Body	鉻鉬釩鋼CrMoV steel
2	閥瓣Disc	鉻鉬釩鋼CrMoV steel
3	閥座Seat	鉻鉬釩鋼CrMoV steel
4	Upper Body	鉻鉬釩鋼CrMoV steel
5	閥桿Stem	鉻鉬釩鋼CrMoV steel
6	活塞Piston	不銹鋼Stainless steel
7	閥蓋Bonnet	鉻鉬釩鋼CrMoV steel
重量（kg） Weight		403

The impulse safety device is the main safety valve, with auxil-iary valve support contained. This device has characteristics as large discharge ability, convenient adjustment, dual mechanical and electric protection and few workload in installation and maint-enance.
This device is used for inlet and outlet pipe of reheater to avoid mediun pressure exceeding the allowable value to ensure the reheater shall run safely.
1.The impulse safety device is as shown in the figure, mainly consisted of impulse safety valve, the main safety valve, stop valve and throttle valve. Impulse safety valve is a kind of spring safety valve. It is mainly consisted of body , bonnet, disc and other parts.The impulse safety valve can be adjusted by using the spring to regulate the pressure.
The impulse safety valve contains an electromagnet to open and another to close the valve. The actions of the mechanism and the electric appliance are separate and will not affect each other .
2.The main safety valve is as shown in the figure. With astructure of single exhaust and both ends of flange connection, it is mainly consisted of body, bonnet, piston chamber, disc, stem and other parts.
3.Both the sealed surfaces of disc and seat of the impulse safety valve are made of hard alloy of cobalt by overlaying welding Both the seat and the disc of the main safety valve are made of hard alloy of cobalt by plasma spray welding.
4.The upper part of the impulse safety valve contains an elec-tromagnet to open and another to close off. At ordinary times, the close-off electromagnet may not be electrified, but when the sealed surface of the valve leaks or when the mechanical addition adjusting reseating pressure is excessively low, it can be electrified by closing electromagnet to make valve sealed or help the valve clack return and procure a higher seat reseating pressure.
5.The impulse safety valve only leaves the factory after it has passed the seal and sensitivity tests, proved to be qualified.
When the medium pressure inside the reheater exceeding the allowable value, the impulse safety valve opens firstly; the steam enters into the piston chamber of the main safety valve, forcing the main safety valve to open; the reheater bengins discharging steam;after the excess pressure has been released, the impulse safety valve closes, stopping the steam entering into the piston chamber of the main safety valve; the main safety valve automatically colses at the reactions of the spring and medium.

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