The most common use of a Gate valve is when minimum pressure loss is required, and a free bore is a basic need. As long as a gate valve is fully open, there is no blockage in the flow channel. It shows minimum pressure loss, and its unique design makes pipe cleaning an easy job. As a multi-turn valve, a gate valve is operated through a threaded stem. To travel from open to closed, the valve must be rotated numerous times, which reduces the effect of the water hammer. These gate valves are effectively used for a long list of fluids. Following working scenarios support the AVK's gate valves:
- Potable water, wastewater and neutral liquids: temperature between -20 and +70 °C, maximum 5 m/s flow velocity and up to 16 bar differential pressure.
- Gas: temperature between -20 and +60 °C, maximum 20 m/s flow velocity and up to 16 bar differential pressure.
Design features of AVK gate valves
- Integral wedge nut is fixed and made of brass that is corrosion-resistant and is approved for use with drinking water.
- Wedge shoes are completely vulcanised to the wedge core for optimum corrosion prevention and smooth operations.
- Following are some more characteristics of AVK's wedge rubber:
- Little biofilm development
- Shape recovery abilities
- High level of chemical resistance while treating water
- Large stem hole in the wedge prevents stagnant water
- Wedge stop protects seals and coating
- Rolled threads increase the stem’s durability
- Triple safety stem sealing
- Thrust collar contributes to achieving low torques and secures the stem.
- The bonnet recess prevents blow-out as it has a fixed bonnet gasket that encircles the bonnet bolts.
- Countersunk bonnet bolts sealed with hot melt to protect against corrosion
- Full bore not only enables the use of pipe cleaning devices but also ensures low head loss.
- Easy operation is ensured by low operating torques.
- Epoxy coating in compliance with DIN 3476 part 1, EN 14901 and GSK, optionally internal enamel and external PUR coating