European Gate Valves Limited

European Gate Valves have completed a number of contracts for the supply of their double flap gate valves for use on Road Stone Coating Plants because of better performance compared to rotary valves

Double flap valves have successfully overcome premature wear and performance problems which beset the rotary valves previously fitted, and have extended valve MTBF operating life on asphalt plants from an average of only two months to in excess of two years. The double flap valves are installed on pneumatic conveying systems carrying filler fines from a bag filter to storage silo.  Despite rotary valves being specified as abrasion resistant, they still lost performance within a few weeks.  This included accelerated wear leading to leaks and lower throughput of material, necessitating costly overhaul and repair with eventual complete valve replacement required. The abrasive action of the conveyed material on the rotary valve casing, combined with the wiping action of rotary valves, increases clearance between the rotor and casing.  The increased clearance enlarges leak paths available to the conveying air, bypassing the rotor and compromising performance, with a growing reduction in the volume of material being transported. Plant throughput diminishes with corresponding increasing levels of maintenance and costs.  Downtime for rotary valve replacement also affects output production

The European Gate Valves double flap valve successfully eliminates the continuous expensive process of maintenance/replacement/repair because sealing is achieved through the meeting of two flat ground surfaces. No rubbing or wiping action is involved, which minimises the potential for moving parts wear. Due to the design, double flap valves also offer further savings: ·         No need to remove the valve from the process line for repair ·         Access covers for maintenance ·         Replacement parts fitted in-situ ·         Seats and Flaps can be reground   European Gate Valves can supply products tailored to suit the particular thermal, abrasion and pressure requirements of specialised applications, including (but not limited to) the requirements of Cement, Incineration, Pyrolysis, Glass & Ceramics, Energy from Waste, Building Products, Bulk Materials, Environmental, Steel & Iron, Minerals, Non Ferrous, Chemical, Foundries, Agro Chemicals, Paper & Pulp and Gasification.