Gate valves are designed for fully open or fully closed service. They are installed in pipelines as isolating valves and should not be used as control or regulating valves. Operation of a gate valve is performed doing an either clockwise to close (CTC) or clockwise to open (CTO) rotating motion of the stem. When operating the valve stem, the gate moves up- or downwards on the threaded part of the stem.
Where are gate valves used?
Gate valves are often used when minimum pressure loss and a free bore is needed. When fully open, a typical gate valve has no obstruction in the flow path resulting in a very low pressure loss, and this design makes it possible to use a pipe-cleaning pig. A gate valve is a multiturn valve meaning that the operation of the valve is done by means of a threaded stem. As the valve has to turn multiple times to go from open to closed position, the slow operation also prevents water hammer effects.
Gate valves can be used for a vast number of fluids. AVK's gate valves are suitable under the following working conditions:
- Potable water, wastewater and neutral liquids: temperature between -20 and +70 °C, maximum 5 m/s flow velocity and up to 16 bar differential pressure.
- Gas: temperature between -20 and +60 °C, maximum 20 m/s flow velocity and up to 16 bar differential pressure.
AVK also offers regulating valves. Read more about the benefits.
Gate valves with by-pass
By-pass valves are generally used for three basic reasons:
- To allow the pipeline differential pressure to be balanced, lowering the torque requirement of the valve and permit one-man operation
- With the main valve closed and the by-pass open, a continual flow is allowed, avoiding possible stagnation
- Delayed filling of pipelines