Automatic Control Valves
D900 Direct Membrane Valve
Direct-acting membrane main valve for control applications.
Product Description
The D900 is a diaphragm-operated main valve body with a flat-face seat geometry, providing a different flow characteristic from the rubber-lined A900 cone seat. The flat-seat design offers lower headloss at high opening and is preferred for high-flow and constant-flow applications. Compatible with the full range of P-series pilots for pressure, flow and level control duties.
Specifications
Size rangeDN50–DN400
PressurePN16 / PN25
MaterialDuctile iron body, flat EPDM diaphragm
ConnectionFlanged PN16/PN25
Approvals & Certifications
WRASWater Regulations Advisory Scheme: UK approval for use in drinking water systemsISO 9001International quality management system certification
Standards
EN 1074-5
Typical Applications
- High-flow pressure control
- Constant flow applications
- Water treatment works
- Distribution networks

Request a Quote
Send us your size, pressure rating and quantity and we will respond with pricing and full technical documentation, typically within one working day.
Request a Quote or email info@afcvalves.euAt a glance
- Sizes
- DN50–DN400
- Pressure
- PN16 / PN25
- Connection
- Flanged PN16/PN25

