What is a needle valve?
Needle valves,sometimes referred to as axial type control valve or plunger valves, are regulating valves and enable engineers to finely control and regulate water flow and pressure.Needle 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:
When to use needle valves?
Compared to diaphragm control valves, the needle valves can be used with higher differential pressure, and our needle valve standard 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. The needle valves can be manually actuated or can be controlled by electrical, hydraulic or pneumatic actuation.
Features and benefits of AVK needle valves
We offer a wide and unique range of needle valves in high quality materials. Our product range covers DN80 to DN1600 and PN10, 16, 25 and 40. Furthermore, we can offer needle valves up to DN2000 and in PN64 and PN100 on request. Our needle valves are therefore also recommended for regulation in large diameter pipelines and at high pressures.
AVK needle valves are straight-way type control valves and are designed with a one-piece body construction and an innovative design for flow optimization to ensure a reduced pressure loss in open valve position.
Our needle valves require very low operating torques, as the piston is always in hydraulic balance with equal force on both sides at all valve positions.This feature facilitates the operations of all actuators and significantly reduces actuator and gearbox costs.
High quality and long lifetime
With all internal and moving parts in stainless steel, the valves have a long life time. The body is completely protected by fusion bonded epoxy coating.Also, the sealings make up a long life system and high performance seal, located in no-flow zone, is easy replaceable without disassembling the valve from the pipeline.The valves hold a special and innovative gasket for a perfect and bidirectional seat, and all gaskets are located safely in the no-flow zone. In addition, the compact piston has 4-6 replaceable bronze guides to ensure very low vibration. AVK needle valves undergoes a strict quality control carried out using modern equipment as static and dynamic test benches, and quality parameters are carefully checked by our highly qualified staff.
Main features and benefits
- One-piece body construction
- Stainless steel internal parts and fasteners for a long life of the valve
- All ductile iron parts coated with min. 250 µm 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 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
Image of a cut section needle valve, to watch the video on features of the valve; scroll down.