VSI are manufacturers and distributors of hand operated butterfly valves. Their Series 2000 manually operated butterfly valves come in 2-way and 3-way configurations. Both are available in wafer or lug body style with handles (2" to 12"), manual gear operators (2" to 30") and electric or pneumatic actuators (2" to 30").

ARI Valve Corporation are manufacturers of hand operated valves, including bellows seal and butterfly valves. ARI's bellows seal valves are manually operated and reliably sealed under the most severe conditions. Hand operated butterfly valves come in standard and stainless steel for aggressive media.