... , B61,B148,monel 400 or other material 3.size range: 1/2" to 16" bronze check valve features:Product Name: B61 check ... , B61,B148,monel 400 or other materialSize range: 1/2" to 16" bronze valve in petroleum, natural gas, coal and ore mining, processing ... supply system,is a production and construction, check valve closed in all kinds of pipeline system is used to cut off ...