Shanghai Nainai Valve Manufactrue Co.,Ltd.
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   Tele: +86-21-66876198
   Fax: +86-021-56878087
   Add:No.87 Luojing Feiyun Road
   Baoshan District Shanghai
Product name:Nagative safety valve

Product features
The negative pressure safety valve is specially developed by NAINAI Company to satisfy customer's requirement. The brand-new product has been approved by Chinese Technology Office and attained the national patent and the technological award. The innovational technology of the brand-new product has achieved the Chinese leading level in valve industry. The negative pressure safety valve is suitable for negative pressure vessel, of which can prevent the vessel becoming sunken in from the vacuum negative pressure. When the negative pressure of the vessel surpasses the safety level, the negative pressure safety valve will automatically open until the negative pressure of the vessel return to the stipulated level.
The negative pressure safety valve has the following characteristics: and close rapidly, extensive displacement. The negative pressure safety valve adopts the quick full open structural design with the spring of recoil plate. When the pressure surpasses 15% of the open pressure, the valve can quickly open at its predetermined level by the counter-momentum from medium. The capacity of displacement is about 4~5 times than respiration valve with the same caliber.
2.reasonable structural design, spring and medium are totally isolated to avoid the spring becoming invalid from the corrosion by medium, of which ensure the reliable performance of the negative pressure safety valve.
3.if required by customers, NAINAI can install different rigidity and pre- tight strength for spring to set the open pressure of the negative pressure safety valve.
4.using a position pad to control the movement of parts, excellent sealing property.
5.dustproof, rainproof, the installation is convenient.
6.compact structure, artistic appearance.
Body materials: WCB,CF8,CF3,CF8M,CF3M,ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti,Ti,Ti alloy.
Connection type: Flange
Type of products: FA72

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Copyright @ 2005 Shanghai Nainai Valve Manufactrue Co.,Ltd.    ADD: No.87 Luojing Feiyun Road Baoshan District Shanghai City
Telephone: +86-021-66876198 / 56879782   Sales Tel: +86-021-56874084 / 56871325
Service Tel: +86-021-56878077 / 56873724      Fax: +86-021-56878087 

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