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A49H-40 主安全閥

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SKU:A49H-40主安全閥Description:GA49H-4DN25說(shuō)明Instruction主要用于電站鍋爐、壓力容器、減溫減壓裝置上使用，防止壓力超過(guò)允許壓力值，保證設(shè)備安全運(yùn)行

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A49H-40 主安全閥

SKU:A49H-40 主安全閥

Description:

GA49H-4 DN25

說(shuō)明 Instruction

主要用于電站鍋爐、壓力容器、減溫減壓裝置上使用，防止壓力超過(guò)允許壓力值，保證設(shè)備安全運(yùn)行。

This valve is used for power plant boilers, pressure containers, pres-
sure and temperature reducing device and other facilities. It serves to pre- vent the pressure exceeding the highest allowable pressure value and ensure the safety of the device when working.

結(jié)構(gòu)簡(jiǎn)述 Structure briefing

1、當(dāng)介質(zhì)壓力升高到整定壓力時(shí)，沖量安全閥打開(kāi)，介質(zhì)從脈沖管進(jìn)入主安全閥的活塞室，推動(dòng)活塞下降，使閥門(mén)自動(dòng)打開(kāi)，當(dāng)沖量閥關(guān)閉時(shí)，閥瓣又自動(dòng)關(guān)閉。

2、密封面用鈷基鉻鎳不銹鋼堆焊而成，閥瓣經(jīng)熱處理，提高了耐磨性和抗沖蝕性。

1. When the medium pressure rises to the set pressure, the implse
safety valve opens, and the medium in the impulse pipe eners into the pis- ton chamber of the main safety valve from impulse pipe, forcing the piston to descend, and then the valve automatically opens; when the impulse safety valve closes, the disc will also automatically close.
2. The sealed surface is made of Fe base stainless steel by overiaying welding. Through thermal treatment, the wear resistance and anti-erosion of
disc is improved.

1. The main safety valve shall be installed vertically at the highest posi- tion of the deivce.
2. The main safety valve shall be fastened upon the gallow, which sus- tains the back-seat force produced in the steam discharging process of the main safety valve.
3. The exhaust pipe shall contain a special gallow to prevent the force of its weight directly applying on the main safety valve. The connecting lange between the main safety valve and exhaust pipe shall eliminate anyex- tra stress.
4. At the lowest point of the exhaust pipe, water drainage shall be taken into onsideration to avoid producing water hammer whil discharging

外形尺寸和連接尺寸 Dimensions (mm)
Type	DN Nominal diameter	Connecting dimensions
Type	DN Nominal diameter	L	L1	L2	H	D	D1	D2	b	z-d	DN'	D'	D1'	D2	b'	z'-d'
A49H-4	150	220	230	240	486	300	250	204	30	8-25	200	360	310	278	34	12-25
A49H-4	200	270	295	330	615	375	320	260	38	12-30	300	485	430	390	40	16-30
A49H-4	250	300	350	370	646	445	385	313	42	12-34	350	550	490	450	44	16-34