Abstract text

A fluid control valve comprising a valve body having a central bore provided with a plurality of radial apertures defining inlet and outlet ports, wherein at least one annular groove is formed in an outer periphery of the valve body in the region of one of said radial apertures, a filter being provided in said at least one annular groove, the filter comprising a perforated plate or membrane formed into a cylindrical shape and located in the annular bore, the perforated plate being held in place in the groove by retaining means, characterized in that the retaining means comprises an elongate resilient member located around the outer periphery of the perforated plate and adapted to apply a compressive biasing force against the plate.