Ease of use and long-lasting quality
Our extension spindles are designed for ease of use with features that secure easy mounting and easy length adjustment on site. Please see how in our extension spindle animation. Easy operation of the valves is secured by the bottom covers of the extension spindles which protect the valve stems from impurities and enable them to rotate freely – and by a high, uniform and long-lasting quality of the extension spindles.
Our standard extension spindles are designed with outer tubes and bottom covers of PE, key adaptors at the top and stem adaptors at the bottom of cast stainless steel, and inner tubes of galvanized steel. The inner tube is press fit to the key and stem adaptor to safeguard the corrosion protection of the tube. As the last step of the production process the extension spindles are torque tested with up to 675 Nm (depending on size) to ensure durability.
AVK extension spindles for service connection valves feature a patented “Safe Click” three-step mounting process where the quick-mounting clip secures the connection between the valve stem and the bottom adapter of the extension spindle and allows for mounting and demounting without use of tools.
Fixed length extension spindles for gate valves and service connection valves
Fixed length extension spindles are typically used when the distance between the valve and the ground surface is known. However, fast and easy shortening of the extension spindle is possible thanks to the patented AVK design with an expanding bolt facilitating length adjustment merely by use of e.g. a hacksaw.
The extension spindles are available with a pipe cover of 800, 1000, 1500, 2000 and 3000 mm corresponding to the distance from the top of the pipeline to the top of the surface box mounted on top of the extension spindle.
Standard fixed length extension spindles
04/05-001 For service connection valves DN25-50 - key adaptor #14-22
04/F-001 For service connection valves DN25-50 - key adaptor #14.7
04/06-001 For service connection valves DN25-50 - key adaptor #23-32
04/02-001 For gate valves DN40-400 - key adaptor #23-32
04/F-010 For gate valves DN40-400 with US type wrench nut - key adaptor #23-32
Fixed length extension spindles with solid inner bar
We also offer variants with a solid inner bar. The bar is made of steel st. 37 and the top key adaptor and bottom valve stem adaptor are made of galvanised ductile iron.
Telescopic extension spindles for gate valves and service connection valves
Telescopic extension spindles are typically used when the distance between the valve and the ground surface is unknown and length adjustment of the extension spindle will be required after installation.
The top is provided with ears that can be fixed into AVK surface boxes and support tiles. A lock spring prevents the telescopic part from collapsing during installation, as it creates friction inside the inner tube and is securely fixed when the extension spindle is pulled out to its maximum length. The blue center sleeve protects against penetration of impurities between the two PE pipes.
The extension spindles are available with telescopic lengths from 450-700 to 2850-5250 mm. Please refer to the individual datasheets listed below for the length ranges and to “Pipe cover for extension spindles” for the distance from the top of the pipeline to the top of the mounted surface box for each telescopic length per valve DN.
Standard telescopic extension spindles
04/F-009 For service connection valves DN 25-50 - key adaptor #14-22
04/08-001 For service connection valves DN 25-50 - key adaptor #23-32
04/F-004 For service connection valves DN 25-50 - key adaptor #14.7, according to DVGW 336
04/F-006 For service connection valves DN 25-50 - key adaptor #14-22, for valves with Ø55 bonnet
04/04-001 For gate valves DN50-400 and DN450-600 with Ø40 valve stem - key adaptor #23-32
04/F-016 For gate valves DN450-600 with Ø30 valve stem - key adaptor #23-32
04/04-002 For gate valves DN50-600 with US type wrench nut - key adaptor #23-32
Telescopic extension spindles with break zone
We also offer extension spindles with break zone in the key adaptor. The break zone prevents damage to the valve and the extension spindle itself if too much torque is applied. In such events the break nut of ECO BRASS will break. It is easily replaced, and meanwhile, the extension spindle can still be operated by means of a #20 socket wrench. Spare part sets are available consisting of a break nut and a spare socket head bolt.