Control Valves (HA4)
The Hansen control valves are modular pressure regulators, designed primarily for industrial refrigeration systems operating with NH₃. The unique V-port design ensures highly accurate control. Each valve can be equipped with up to three control modules. By combining different modules, a wide range of functions and function combinations can be achieved.
Hansen valves are supplied as standard with weld flanges. To minimize installation time, Hansen valves can be directly connected to Hansen strainers (ST) and check valves (HCK). For even greater time savings, the Hansen MVP (Multi Valve Platform) can be used, which is partially compatible with the same control modules.
Applications
Evaporator pressure regulation
Discharge pressure regulation
Differential pressure control for pumps and oil systems
Relief regulation for hot gas defrost
Outlet pressure regulation (start-up control)
Features:
Handwheel for manual operation
Dirt-shedding piston design
V-port trim for precise control
Reliable PTFE sealing
Ductile iron body
Optional pressure gauge connection
Easy to service and disassemble
Kv values from 0.35 to 354
Available in DN10 to DN150
PS25 or PS40
Available control modules
| Module | Function |
|---|---|
| A | Constant pressure. Opens when the pressure rises. |
| AS | Solenoid valve. Normally open or closed. |
| AL | Differential pressure. Maintains a set pressure difference between inlet and outlet or other reference pressure. |
| AO | Outlet pressure. Opens when outlet pressure drops. |
| AK | Relief control. Opens fully when set pressure is exceeded and closes when pressure falls. |
| Seal plugs | for closing or opening ports. |
Examples of common valve configurations
| Type | Function |
|---|---|
| HA4A | Inlet pressure regulator (1× module A) |
| HA4AS | Inlet pressure regulator with shut-off function (1× module A, 1× module AS) |
| HA4AB | Inlet pressure regulator with full-open function (1× module A, 1× module AS) |
| HA4AD | Inlet pressure regulator with two settings (2× module A, 1× module AS) |
| HA4AO | Outlet pressure regulator (1× module AO) |
| HA4AL | Differential pressure regulator (1× module AL) |
| HA4AK | Relief regulator (1× module AK) |
Other combinations are available, with up to three modules per valve.