H77H-16C,H77H-25C,H77H-40C,H77H-64C蝶形止回阀
止回阀(Check Valve)：止回阀又称单向阀或逆止阀，其作用是管路中的介质倒流。水泵吸水关的底阀也属于止回阀类。
启闭件靠介质流动和力量自行开启或关闭，以介质倒流的阀门叫止回阀。止回阀属于自动阀类主要用于介质单向流动的管道上，只允许介质向一个方向流动，以发生事故。止回阀按结构划分，可分为升降式止回阀、旋启式止回阀和蝶式止回阀三种。升降式止回阀可分为立式和卧式两种。旋启式止回阀分为单瓣式、双瓣式和多瓣式三种。蝶式止回阀为直通式、以上几种止回阀在连接形式上可分为螺纹连接、法兰连接和焊接三种。止回阀的安装应注意以下事顶：1、在管线中不要使止回阀承受重量，大型的止回阀应支撑，使之不受管系产生的压力的影响。2、安装时注意介质流动的方向应与阀体所票箭头方向一致。3、升降式垂直瓣止回阀应安装在垂直管道上。4、升降式水平瓣止回阀应安装在水平管道上。
H41H/W升降式止回阀，H42H/W立式止回阀，H44H/W旋启式止回阀，H71H/W对夹升降式止回阀，H72H/W对夹升降式止回阀，H74H/W对夹单瓣旋启式止回阀，H41T铸铁升降式止回阀，H44T铸铁旋启式止回阀，H76H/W对夹双瓣旋启式止回阀，H46H/W对夹双瓣旋启式止回阀，H77H/W对夹蝶型止回阀，H44W黄铜旋启式止回阀，H12W黄铜内螺纹立式止回阀，H14W黄铜内螺纹旋启式止回阀，H12W不锈钢内螺纹立式止回阀，H14W不锈钢内螺纹旋启式止回阀，H14Y、H64Y内螺纹与承插焊止回阀，H15Y、H65Y锻钢Y型止回阀，H44Y锻钢旋启式止回阀，HH44X微阻缓闭止回阀，HDH49X微阻缓闭蝶式止回阀，SFCV、H4X橡胶瓣止回阀，H1X节能梭式止回阀，H1X消声止回阀，DRVZ、H2T静音止回阀，HQ41X滑道式止回阀，HQ44X、HQ45X微阻球形止回阀，H44Y高温止回阀，H72Y高压对夹立式止回阀，H63H/Y/F高压角式止回阀，DH61Y焊接式低温止回阀，DH41F法兰低温止回阀，HDH47X蝶式缓冲止回阀，H41J升降式衬胶止回阀，H40J浮球式衬胶止回阀，H44J旋启式衬胶止回阀，H41F46衬氟止回阀，BH44H保温止回阀，Y型自密封止回阀H15Y、H65Y，H42F球芯式塑料止回阀，H44F旋启式塑料止回阀，多功能止回阀，卫生级止回阀，H44H/W美标旋启式止回阀，H71H/W美标对夹升降式止回阀，H72H/W美标对夹升降式止回阀，H76H美标对夹双瓣旋启式止回阀，H46H/W美标对夹双瓣旋启式止回阀，H44H/W日标旋启式止回阀，H41H/W德标升降式止回阀，HY41W氧气止回阀，H42B氨用止回阀，H41N、H42N 液化气升降式止回阀，H44N液化气旋启式止回阀，黄铜锻压(不锈钢网)底阀
阀体材质:20#﹑1Cr18Ni9Ti﹑304﹑316﹑316L﹑12Cr1Mov 、双相钢、蒙乃尔、纯镍、因科镍、哈氏合金、310S、钢、CD4MCU、904L、317L、纯钛
密封面材质:H、J、F46、Y、W、T、G。工作压力1.6-32MPA，工作温度-40°C- 550°C。阀门口径 DN15-DN1000。连接方式:法兰、焊接、内螺纹、对夹。传动方式:自动、适用介质:水、油品、气体、蒸汽、酸类。制造标准:国标、美标、日标、德标。
Thank you for your trust and support of our company, we will be dedicated to serve you!
感谢您对我司的信赖与支持，我们将尽心为您服务！
Our company according to ISO9001 international quality system certification requirements, management, production valve business, for the valves every aspect of the production process have developed a series of detailed technical rules and strict control. In the factory have strict inspection and pressure test, so that "the Young" product quality has been a reliable guarantee.
When you buy "ZhongYang Valve" products has been accompanied by a service to you, our solemn promise to you:
我公司根据ISO9001国际质量体系要求、管理、生产阀门企业，对于阀门生产加工过程的每个环节均制订了一系列详细的工艺规程，并进行严格的控制。在出厂前都进行严格检验和试压，使“中扬”产品质量得到了的。当您买进“中扬阀门”产品时服务就一直伴随着您，我们向您郑重：
Product is sold within a year if quality problems, the company promises "three guarantees" service; namely repair, replace or return; allowing you to enjoy the full service, rest ured to buy! We are ready to provide coverage to any city nationwide technical support to users for any product issues raised by users, within 24 hours we will make an ysis and answer. If you need service, our service staff will arrive within 1-3 days of the user site, did not solve the problem does not leave! I also introduced the product lifetime technical support, will periodically send service personnel for sale with onsite consulting services.
产品售出一年内如有质量问题，本公司“三包”服务；即包修、包换、包退；让您享受的优质服务，放心的购买！我们提供覆盖到任何一个城市用户的技术支持，对任何用户提出的产品问题，我们将在24小时内作出分析和回答。若需要售后服务，我们的售后服务人员将在1-3天内到达用户现场，问题没解决不离开！我公司还对产品实行的技术支持，将定期派出售用服务人员进行上门咨询服务。
Our confidence comes from your approval, your satisfaction is our greatest wish!
我们的信心来源于您的，您的满意是我们的愿望！
