Features and configurations of AVK needle valves
We provide a comprehensive range of high-quality needle valves, also known as plunger valves, designed to meet the demands of diverse applications. Available in various configurations with optional features for actuation and cavitation prevention, AVK needle valves are the ideal choice for regulating large diameter pipelines and handling high pressures.
Needle valve with a state-of-the-art design
AVK needle valves are straight-way type control valves and are designed with a one-piece body construction and an innovative design for flow optimisation 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.
Our standard range comprises DN80-1600 and PN10, PN16, PN25 and PN40. Furthermore, we offer needle valves up to DN2000 and in PN64 and PN100 on request.
High-quality needle valves designed for extended durability and longevity
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, and easily 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 undergo a strict quality control carried out using modern equipment such as static and dynamic test benches, and quality parameters are carefully checked by our highly qualified staff.
Main features and benefits of AVK needle valves
- 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 optimised to give a low head loss coefficient in fully open position
Dedicated software for precise size calculation
Each valve is specified according to relevant selection criteria for its specific application. Upon order or request it is therefore mandatory to provide information about hydraulic data (flow rate and pressure), installation design and requested actuation. This ensures that the valve has an optimal performance for the given installation. By using our dedicated software for sizing calculations, we provide a fluid and cavitation report under the hydraulic conditions. The report will guarantee a cavitation free valve.
Needle valve configurations
We offer a selection of optional extras for actuation and cavitation prevention. Each valve is fitted to the actual operating data and works without cavitation even at major pressure differences.
Actuation
- Worm gear box and handwheel
- Electric actuator
- Hydraulic
- Hydraulic brake and lift unit
- Double acting hydraulic piston
- Simple acting hydraulic piston
- Double or single acting pneumatic actuator
Needle valves with cavitation trim
- Intrusive
- Dissipating cylinder
- Non intrusive
- Dissipating plate
- Venting device
