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About product and suppliers:
        Alibaba.com offers 225 keystone butterfly valve products. About 58% of these are valves, 1% are pipe fittings. 

A wide variety of keystone butterfly valve options are available to you, such as free samples. 

There are 146 keystone butterfly valve suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Indonesia, which supply 97%, 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 84 with ISO9001, 15 with Other, and 13 with ISO14001 certification.