DN15 Threaded Vertical Check Valve (Type 1St) — Internal & External Threads, Wire Mouth Screen What it is Compact one-way (check) valve for DN15 (15 mm) piping. Vertical orientation with an integrated wire mouth screen. Both internal (female) and external (male) threaded ends for flexible mounting. Key benefits — why you need it Prevents backflow to protect pumps, fixtures, meters and downstream equipment. Built-in wire mouth screen captures debris at the valve inlet, reducing clogs and downstream maintenance. Dual-thread design (internal and external) allows fast adaptation to different fittings or tight installation spaces without extra adapters. Core features Size: DN15 (15 mm) suitable for small-diameter lines and compact assemblies. Connections: Threaded internal and external ends for compatibility with standard threaded fittings. Flow control: Vertical check valve ensuring reliable one-way flow and automatic closure against reverse flow. Debris management: Wire mouth screen at the inlet for particulate capture and extended service life of downstream components. Model: Type 1St — compact check valve with wire mouth. Material and compatibility Material not specified in this listing. Confirm body, internals and seal materials on the product data sheet before use. Verify chemical compatibility with the fluid and confirm seal material suitability for temperature and pressure of your system. Installation notes Install with correct flow direction (vertical orientation as specified). Use appropriate thread sealant or PTFE tape rated for your fluid and temperature. Match the valve’s thread form and pitch to your existing fittings (confirm male/female thread standards on the data sheet). Inspect the wire screen periodically and clean or replace as needed to maintain flow. Typical applications (practical examples) Domestic water: Installed after a booster pump to prevent reverse flow into the pump and protect household plumbing. Irrigation: Inline protection on small-diameter irrigation branches to stop backflow and trap sand or plant debris before emitters or valves. Small industrial piping: Backflow prevention in tight process lines where particulate-laden fluids may enter and where compact, threaded connections are required. Performance and maintenance Provides automatic one-way flow control with debris screening for reduced clogging. Inspect the wire mouth periodically and clean screens to sustain flow rate and prevent pressure loss. Confirm maximum pressure, temperature ratings and seal compatibility from the technical data sheet before specifying. Ordering and verification Specify DN15, Type 1St when ordering. Confirm thread standards, material details and pressure/temperature ratings on the product datasheet to ensure compatibility with your system.