Needle valves referred to as plunger valves, it is a regulating valve that controls and regulates water flow and pressure. In terms of “Precise regulation”, the precision of the valve is gained through the subtle movement of the shaft that enables the gearbox to move the piston tube in sliding motion unto its open and close position, based on the control system.
When do we usually use needle valves?
While our needle valve standard range includes a pressure range up to PN40, and on request up to PN100, needle valves can be employed with larger differential pressure than diaphragm control valves. Our typical size range spans DN80 to DN1600, with DN2000 available upon request. As a result, our needle valves are also advised for regulation in pipelines with large diameters and high pressures.
Needle valves can be used in different applications that require flow or pressure regulation such as: water treatment and distribution, dams, reservoirs, power plants and industry needle valves. It can be use with:
- Flow control
- Pressure regulation
- Pump start
- Turbine by-pass
- Reservoir inlets
- Air regulation
Main features and benefits:
- One-piece body construction
- Stainless steel internal parts and fasteners for the long life of the valve.
- Ductile iron parts are coated with min. 250μm fusion bonded epoxy.
- Shaft sealing with double O-rings.
- Main seal in the no-flow zone at the valve outlet
- 4-6 guide rails ensure very low vibration.
- Gaskets in the thermoplastic PUR for high resistance to abrasion
- Pressure balance in chamber inside for low operating torque
- Symmetric flow path with annular flow cross section in any open position
- Internal body shape is optimized to give a low head loss coefficient in fully open position.
See below animation of AVK Needle valves: