A filter unit

摘要

A filter unit comprises a filter housing defining a filter accommodating chamber 10 for accommodating a filter element, a fluid inlet 15 and a fluid outlet 13 formed in the filter housing communicating with the filter accommodating chamber 10. An access opening 16 formed in the filter housing to the filter accommodating chamber 10 for accommodating a filter element 11 therethrough to the filter accommodating chamber. A primary closure element 17 is releasably and sealably engageable in the access opening for sealably closing the access opening and for retaining the filter element in the filter accommodating chamber. A vent opening is provided in the primary closure element for venting the filter accommodating chamber and a secondary closure element 30 releasably and sealably engageable in the vent opening for sealably closing the vent opening. Advantageously the filter unit may be used when supplying compressed air to pneumatically operated apparatus.