Gate valve WEY HSI

pneumaticisolationstandard

These fast-action dampers are most robust, heavy-duty explosion isolation systems. The operating principle is similar to knife gate valves, but the trigger response and closing times are extremely short. The small-diameter versions are extremely resistant to explosion pressure and rated up to 50 bar (larger versions are rated up to 30 bar). These ratings are most likely to occur with explosion of gas and dust mixtures. In standard applications, the fast-action explosion isolation gate valves can be used with dust, gas or gas and dust mixtures. Not unlike HRD systems, the explosion isolation gate valves are triggered by dynamic pressure and/or flame sensors, and the whole explosion isolation system is managed by a dedicated control unit. The fast-action explosion isolation gate valves can be operated as certified explosion isolation systems in installations designed to withstand the maximum possible explosion pressure (i.e. 10 bar by design). The list of equipment systems this explosion isolation solution can be applied in is practically limited by the ductwork diameter only, the maximum of which is DN400. The applications include filters, cyclone separators, processing reactors, dryers, pressure tanks, silos, and grinding mills. The only drawback of the solution is a very high price, especially in the large diameter spectrum. However, the benefit is a system which can be restarted independently by the user following an explosion, with no need for a field service call. This is essential for those processing systems where the minimum shutdown time is critical.