Frequently asked questions and application ranges You still have any other questions? Please send us an eMail.
	Question 1:	What is the installation position of the RITAG wafer type check valve?	Info
	Question 2:	What are the important points to watch out for as regards the flow direction of the RITAG wafer type check valve with standard springs (in the case of the ZRK also without springs)?	Info
	Question 3:	What is the operating principle of the RITAG wafer-type check valves?	Info
	Question 4:	How is the functional reliability of the RITAG wafer-type check valves guaranteed?	Info
	Question 5:	When can noise develop at the valve, thus causing abrasion, and how can this be prevented?	Info
	Question 6:	What control possibilities exist to guarantee the function of the RITAG wafer-type check valves?	Info
	Question 7:	How can a RITAG wafer-type check valve work stably even though the flow rate is too small if the nominal width of the pipeline cannot be changed?	Info
	Question 8:	How "tight" are RITAG wafer-type check valves?	Info
	Question 9:	What might be the causes of increased seat leakage?	Info
	Question 10:	What might be the cause of a gland leak (ZRD, ZRL-HG)?	Info
	Question 11:	Why haven't I got any flow through the check valve?	Info
	Question 12:	What is the cause of a leak at the interim flange seal(s)?	Info
	Question 13:	Has RITAG got an established quality assurance system?	Info
	Question 14:	Does RITAG meet the requirements according to PED 97/23/EC?	Info
	Question 15:	Do the RITAG wafer-type check valves have a CE mark?	Info
	Question 16:	Why are DN 25 valves not labelled with a CE mark?	Info