What is a needle valve?

Needle valves, sometimes referred to as plunger valves, are regulating valves and enable engineers to finely control and regulate water flow and pressure. The precision is achieved through the fine movement of the shaft, which enables the gearbox to move the piston tube in sliding motion towards opening or closing position, depending on the requirements from the control system.

Where to use needle / plunger valves?

Needle and plunger valves can be used in many different applications with a need for flow or pressure regulation. In water treatment and distribution, dams, reservoirs, power plants and industry needle valves are e.g. used for:

  • Flow control
  • Pressure regulation
  • Pump start
  • Turbine by-pass
  • Discharge
  • Reservoir inlets
  • Air regulation

When to use needle / plunger valves?

Compared to diaphragm control valves, needle and plunger valves can be used with higher differential pressure, and our standard needle valve range covers a pressure range up to PN40, and on request up to PN100. Our standard size range covers DN80 to DN1600, and on request up to DN2000. Needle valves can be manually actuated or can be controlled by electrical, hydraulic or pneumatic actuation.

Read about features and benefits of AVK needle valves and more about our variants and configurations.
We also recommend checking out why use control valves and application examples for control valves.

Case

Needle valve for dam base drainage renewal

The water management association Aggerverband maintains several dams in the German state Nordrhein-Westfalen. For the renewal of the base drainage at one of these dams, AVK delivered a needle valve DN1200/PN16.
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Needle valves

Learn about when to use needle valves, AVK’s wide range of needle valves, and how they offer precise regulation of water flow and pressure.

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Needle valves

Features and function of our needle valves series 872

Insights

Why use control valves?

Control valves can help reduce water losses and contribute to efficient water supply management by maintaining a certain pressure, flow or level, regardless of changes in the supply network.
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