Double Air Valves are available with an integral stop valve located between the two air valve bodies. Double air-valves are fixed on all elevated points and scour-pipes in the depressions.

Double-door check valves are used to prevent water hammer from the backflow of a pressure tank when automatic controls shut down a fire pump. These are used for refineries, petro chemical plants and water pump stations.

Double-Offset Butterfly Valves are self-closing due to dynamic torque with the torque peak occurring at about 75 degrees open. Double-offset butterfly valves have reduced breakout torque as well as reduced dynamic torque.

Double Union Ball Valves feature a unique double union/double block design, which permits in-line maintenance without disconnecting pipe. It features full port design, which allows minimum flow restriction. They have working pressure of 150 PSI. It is designed for industrial applications of steam, water, oil, gas and corrosive materials.

Dual cylinder roller gate is specifically designed to handle dry material in gravity flow and low pressure applications, where positive material shut-off and a dust tight seal are required. This gate is used to eliminate the frequent need for valve maintenance, production inefficiencies, and unsanitary plant environments.

Dual Flow Vacuum Valve is limited by a small orifice. These are used only in non-porous parts or for slightly porous lightweight parts. It uses a blow-off pulse of compressed air to break the vacuum and release the part more quickly. The non-sealing cups will leak and cause the associated dual-flow valves to close to orifice flow only.

Dual Line Valves are completely hydraulic in operation that delivers either oil or grease. They are used in SAE-type O-rings for all closure plugs and end caps. Its superior main piston, indicator assembly design and precision hone-fitted pilot pistons make this valve that requiring injection pressures up to 6,000 psi.