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ZFV GOST wafer double offset butterfly valve. ZFV provide butterfly valve produced according to GOST standard. Design and manufacture data of GOST standard is different from API/ANSI standard. Flange dimension of GOST is GOST12815. requirement of face to face length like othe standard, there two patterns for both wafer end valve and flange end valve: short pattern and long patter. In case any enquire, better to clarify face to face length with end user requirment, so that can provide right suggestion for customer.  China Wafer Double Offset Butterfly Valve

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