Check Valves and Combined Flow Restrictors
Prevent reverse flow in showers and pipework. Compare DN for conventional positions, DS for shallow cavities, HL for combined restriction and check functions, and DT for regular removal.
Compare Uses and Structures
DN / DS | Standard and Short Check Valves
DN / DS | Standard and Short Check Valves
DN1300, DN1400 and DN1500 serve shower and pipe-end check positions. Short DS1400 / DS1500 suit shallow handles, slim overhead showers and compact fittings.
Hand-shower inlet / overhead shower / pipework
Backflow prevention
Compare length and diameter; a short body does not itself provide flow restriction.
DB / DT | Internal Fit and Service Access
DB / DT | Internal Fit and Service Access
DB models serve internal combined restriction and check positions. T-shaped DT1814 / DT1815 suit shower and pipe positions requiring regular removal for cleaning.
Internal fitting / shower service position
Flow restriction + backflow prevention
Choose by internal fit and service access, then confirm the ordering model against its drawing.
HL | Both Functions at One Position
HL | Both Functions at One Position
HL1400, HL1500 and HL1814 combine restriction and a check function for showers and pipework needing both in one component.
Hand shower / overhead shower / pipework
Start with DN / DS for check-only requirements; compare combined formats when restriction is also needed.
What Guides the Choice
Required functions
Separate backflow prevention from the need to limit forward flow.
Cavity depth
Compare short DS1400 / DS1500 when the standard length will not fit.
Removal access
For regular cleaning, check whether the complete assembly provides a removal path.
Assembly fit
Confirm direction, sealing and supply conditions with a sample, rather than diameter alone.
Share the Installation Space and Check Requirement
Send a drawing or photo with flow direction and usable depth. Add target flow and pressure when restriction is also needed.
DN / DS | Standard and Short Check Valves