MC Template Map for Velan Valve United States Opco, Inc. Map for Velan Valve United States Opco, Inc. Search | Advanced Search | New Members | Coupons and Discounts | All Categories Industrial & Manufacturing >> Manufacturing >> Manufacturers Velan Valve United States Opco, Inc. 94 Ave. CWilliston, VT 05495 | directions 802-304-5911 | fax: 802-862-4014 Visit Site If your business isn't here, contact us today to get listed!