For many years, AVK International has offered a wide range of gate valves covering both VdS and UL/FM approved variants up to DN400. Since 2021, AVK has also offered UL/FM approved resilient seated gate valves in DN450-600. They feature a slim low-weight design and the same design features as our standard gate valves in smaller dimensions.
The range is manufactured at AVK’s premises in Denmark and consists of gate valves in DN450-600 available in three main types:
- with rising stem (OS&Y) and handwheel
- with non-rising stem (NRS), post indicator flange and wrench nut
- with non-rising stem (NRS), ISO flange and wrench nut
OS&Y gate valves are used in above-ground installations, where the rising stem design makes it easy to recognise the wedge position, open or closed, even at a distance. NRS gate valves are available with topflange for mounting of post indicators and with ISO flange for mounting of actuators.
The three valve types are available with PN16 and ANSI class 150 drilling and with stem of stainless steel 1.4401/AISI316 or alu bronze – a total of 12 standard valve variants.
Main features and benefits
It is crucial that the rubber components are of the highest quality to ensure a safe, watertight seal and trouble-free operation, even after many years without use. In our rubber factory, AVK GUMMI A/S, we develop and produce our own rubber components to make sure that they meet our uncompromising standards of excellence.
The valve wedges are fully vulcanized with drinking-water-approved EPDM rubber and equipped with wedge shoes to provide smooth operation. The double-bonding rubber-vulcanization process ensures maximum adhesion of the rubber and large rubber volume in the sealing area provides optimum sealing. Our rubber compound features an outstanding compression set value, enabling it to regain original shape.
Other design features
- Fixed, integral wedge nut prevents vibration and ensures durability
- Stainless steel 316/alu bronze stem and brass wedge nut for high corrosion resistance
- Gland-follower for re-tightening with three main O-rings
- No hollows or cavities where stagnant water might collect and cause contamination
- Stem nut in high strength alu-bronze
- Stem seal consisting of three O-rings in series with adjustable compression
- Thrust bearing consisting of stainless-steel discs coated with a low friction, self-lubricating bronze-PTFE composite
- Round NBR bonnet gasket fixed in a recess to avoid blow out
- Countersunk and sealed stainless-steel bonnet bolts encircled by the bonnet gasket
- ISO F16 actuator flange
- Integrated lifting eyes for easy handling
- Installation with horizontal or vertical stem
- Bosses for by-pass
- Outside yoke and stem gives a clear indication of valve position from a distance
- Fusion bonded epoxy coating in compliance with DIN 3476 part 1 and EN 14901, RAL 3000, GSK approved.
