AVK DN250 (10") FL
NEW NEVER USED
The AVK DN250 (10") disc valve is a robust and very versatile product, often used in the drinking water, water distribution and other applications that require the regulation of liquid flows. This type of valve, model AVK DN250 , features a flanged configuration and meets ANSI and AWWA standards, offering guarantees of high quality and reliability.
Visually, the AVK DN250 stands out with a compact ductile iron ( GG-GJL ) body, coated with a blue epoxy resin finish, which protects it from corrosion and wear. The valve has a central disc in ductile cast iron coated in EPDM (rubber approved for potable use), which ensures perfect closure. The disc is profiled to minimize flow resistance, thus reducing wear on the internal lining and ensuring long-lasting operation even in vacuum conditions (
)(
).
The valve has a nominal diameter of 250 mm (10 inches) and uses a flanged connection according to ANSI . The installation length (L) is 165 mm, while the total height (H1) is 245 mm. The overall weight is around 50 kg, making it an easy-to-handle valve for its category (
).
This valve is designed to work in a pressure range of PN16 , making it suitable for medium pressure applications, such as water distribution networks. The disc is designed to rotate with low torque, thanks to the profiled edge design, which reduces mechanical stress on the internal components. The valve is designed to close clockwise and offers an excellent level of abrasion resistance, especially in environments requiring intensive use (
).
The use of the valve is simple: via a manual or automatic actuator, the disc rotates to open or close the flow of liquid. During installation, it is essential to ensure that the flanges are aligned correctly to avoid sealing problems. The rotary closing mechanism guarantees a reliable seal, also suitable for liquids with suspended particles(
).
Among the accessories compatible with the AVK DN250 we find electric or pneumatic actuators to automate opening and closing. It can also be combined with flow meters to monitor the flow rate and adjust operation based on operational needs (
).
To optimize the use of the valve, the pressure drop (ΔP) calculation formula across the valve can be applied, based on factors such as nominal diameter and flow velocity. The relationship is:
ΔP=k⋅(V22g)\Delta P = k \cdot \left(\frac{V^2}{2g}\right) Δ P = k ⋅ ( 2 g V 2 )Where:
Maintenance of the AVK DN250 is relatively simple. It is advisable to periodically inspect the internal EPDM linings and O-rings for any signs of wear or damage. The valve may be lubricated occasionally to ensure smooth movement of the disc. It is also important to check that the flanges are correctly tightened and that there are no leaks (
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).
A used AVK DN250 disc valve in good condition should have a disc with no obvious signs of corrosion or deformation. The EPDM coating should not be cracked or worn, and the actuator should operate without excessive strain. The absence of obvious leaks is a sign that the O-ring seal is still effective. Furthermore, it is important to check that the actuator moves smoothly and that the valve body does not have any structural damage (
).
This valve is ideal for the water industry and drinking water distribution, but can also be used in other applications requiring the regulation of flows of neutral or moderately aggressive liquids. It is particularly appreciated for its durable design and ease of installation and maintenance.
Buying a used AVK DN250 disc valve saves costs without compromising reliability. If properly maintained, such a valve can provide years of uninterrupted service at a much lower price than a new product.
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