Modular Control Valve System
A900 Automatic Control Valve System
The A900 is a hydraulically operated, diaphragm-actuated control valve built around a single modular body. Interchangeable pilot valves determine the control function: the same body can reduce pressure, control flow, protect against surge, or fill a tank to a set level.
Size range DN50–DN1000, available in PN10, PN16 and PN25. Pilots can be combined on a single body for compound control functions.
How the modular system works
An existing A900 body in the field can be reconfigured for a different duty by swapping pilots, no new body required.
Pressure control
Reduce, sustain, or limit downstream pressure. Use where supply pressure fluctuates or exceeds system requirements.
Pressure Reducing Valve
DN50–DN600
Pressure Reducing with Check Valve
DN50–DN600
Pressure Sustaining and Reducing Valve
DN50–DN400
Pressure Reducing Valve with Flow Limiter
DN50–DN400
Pressure Reducing Solenoid Control Valve
DN50–DN400
Pressure Reducing Valve – High Flow
DN200–DN600
Pressure Relief / Sustaining Valve
DN50–DN600
Pressure Sustaining Valve with Solenoid Control
DN50–DN400
Flow control
Maintain a set flow rate regardless of pressure variation upstream or downstream.
Level and altitude
Fill tanks or reservoirs to a set level and shut tight on full. Bi-level variants add a low-level refill trigger.
Surge and pump protection
Prevent water hammer on pump start/stop. Surge anticipating models open before the pressure wave arrives.
Remote and solenoid control
Open, close, or modulate the valve via electrical signal. Use for automated systems, SCADA integration, or on/off duty.
Differential pressure
Maintain a constant pressure difference between two points in a network, used in district heating and cooling systems.
Valve bodies
The A900 main valve body without pilot, for custom pilot configurations or replacement. R900 for reduced-bore applications. Threaded variant for smaller line sizes.
Pilot valves
Pilots are the small control valves that sense line conditions and drive the A900 main body. Each named configuration uses one or more pilots from this range. Available separately for field reconfiguration.
Need a quote or technical advice?
Our team can help specify the right A900 configuration for your application.