June 4 (Reuters) - U.S.-based equipment manufacturer

Chart Industries ( GTLS ) and Flowserve Corp ( FLS ) said on

Wednesday they will merge in an all-stock deal expected to have

an enterprise value of about $19 billion.

Chart shareholders will receive 3.165 shares flow control

systems maker Flowserve's ( FLS ) common stock for each share of Chart

owned, the companies said.