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About product and suppliers:
        Alibaba.com offers 148 keystone butterfly valve products. About 92% of these are valves, 1% are pipe fittings. 

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

There are 150 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 Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 86 with ISO9001, 14 with ISO14001, and 13 with OHSAS18001 certification.