fire AVK hydrants for underground use

Underground fire hydrants

AVK underground fire hydrants are smooth-running and practically maintenance-free.

AVK series 35 underground fire hydrants

Automatic drainage

The 8 mm drainage hole is automatically closed over the entire valve lift, so that no pressurised water can escape. This means that the drainage hole is closed before the pressurised water is able to flow into the hydrant, and no pressurised water can escape. The patented valve disc in the single shut-off underground fire hydrant is asymmetrically shaped to speed up water withdrawal and emptying. This also reduces the number of turns from closed position to stop.

Corrosion protection

Our double shut-off underground fire hydrants are provided with threaded holes for all threaded connections. This refers to the connections between the claw, the end cap and the upper barrel as well as between the upper barrel and the ball chamber. There are no open thread pitches, which avoids contamination and corrosion. Furthermore,  the main seal ring for the ball shut-off is vulcanized with EPDM for optimisation of the corrosion protection.

Optimisations

In order to facilitate installation and ensure the best possible ergonomic handling, the fire hydrants have been weight optimised. The valve cone is completely vulcanized with polyurethane (PUR), and the high quality of this elastomer ensures an optimal sealing due to its unique memory effect. The double seal of the stem consists of a scraper and a brass bush as a plain bearing with three O-rings.

Installation of AVK underground hydrant
Underground hydrant from AVK in the process of being installed

AVK series 29 underground fire hydrants

Series 29/40 fire hydrants are based on AVK's renowned gate valve design with fully vulcanized wedge, fixed wedge nut and triple safety stem sealing. It is available with bayonet, Storz or NOR coupling.

Series 29/50 variant is designed with a riser pipe of stainless steel and an AVK extension spindle. 

Series 29/78 free flow underground fire hydrants are designed without any parts obstructing the medium. The hydrant is with single shut-off and vertical outlet.

Underground fire hydrants in our range

Our standard product range of underground fire hydrants includes the following types:

AVK animation about features and options of our underground hydrants L7 series 35 - thumbnail

Animation

Underground fire hydrant L7

Animation about features and function of our underground fire hydrants (L7) series 35.
AVK fire products pricelist

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Price list – fire protection

January 2024. Get an overview of our valves, hydrants and accessories for fire protection applications.