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About product and suppliers:
        Alibaba.com offers 124 keystone butterfly valve products. About 89% of these are valves, 1% are pipe fittings. 

A wide variety of keystone butterfly valve options are available to you, such as butterfly, ball, and control. You can also choose from casting, stainless steel, and rubber. As well as from manual, pneumatic, and hydraulic. And whether keystone butterfly valve is normal temperature, medium temperature, or low temperature. 

There are 127 keystone butterfly valve suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Indonesia, which supply 96%, 2%, and 1% of keystone butterfly valve respectively. 

Keystone butterfly valve products are most popular in Southeast Asia, Mid East, and North America. 

You can ensure product safety by selecting from certified suppliers, including 69 with ISO9001, 10 with Other, and 7 with ISO14001 certification.