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Zhejiang Cheng Yi Valve Co

It is used in petroleum, chemical industry, metallurgy, electric power, milit...

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home > sell > Supply Zhejiang Chengyi high pressure American standard globe valve
Supply Zhejiang Chengyi high pressure American standard globe valve
products: Views:10Supply Zhejiang Chengyi high pressure American standard globe valve 
brand: 浙江诚一
price: 面议
MOQ:
Total supply:
Delivery date: Shipped within 3 days from the date of payment by the buyer
Valid until: Long-term validity
Last updated: 2014-10-16 15:25
 
Details
 高压截止阀属于强制密封式阀门,所以在阀门关闭时,必须向阀瓣施加压力,以强制密封面不泄漏。当介质由阀瓣下方进入阀内时,操作力所需要克服的阻力,是阀杆和填料的磨擦力与由介质的压力所产生的推力,关阀门的力比开阀门的力大,所以阀杆的直径要大,否则会发生阀杆顶弯的故障。近年来,从自密封的阀门出现后,截止阀的介质流向就改由阀瓣上方进入阀腔,这时在介质压力作用下,关阀门的力小,而开阀门的力大,阀杆的直径可以相应地减少。同时,在介质作用下,这种形式的阀门也较严密。我国阀门“三化给”曾规定,截止阀的流向,一律采用自上而下。
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