Access Valves are in fact one-way valves but instead of allowing forward flow they allow instruments such as catheters or cameras to open and pass through the valveand close automatically as soon as the instrument is withdrawn. This way they act as a port and allow access to what is on the other side.

Gate valves are used for various purposes and they can be seen commonly in homes and commercial centers. Different materials such as stainless steel, cast iron, alloy steel, forged steel etc are used to manufacture these valves. Gatevalves are used to either halt or start the flow of water.