Cooling Water & Hydraulic Piping

Cooling Water Connections

Water Supply Requirements

Parameter	Requirement
Supply pressure	3–5 bar (regulated)
Supply temperature	15–28°C
Flow rate	Per machine data sheet (typical 30–120 L/min)
Water quality	Per cooling water quality specifications (see Maintenance Manual)

Piping Recommendations

Pipe Type	Recommendation
Main supply/return	Galvanized steel or PVC schedule 80
Flexible connections to machine	Reinforced rubber hose with braided stainless steel jacket
Drain connection	PVC or steel, minimum DN40
Shut-off valves	Full-port ball valve, supply and return
Pressure regulation	Pressure reducing valve if supply > 6 bar
Flow indication	Paddle-type flow switch or rotameter

Install a Y-strainer with a mesh size of 0.5 mm at the machine cooling water inlet. This prevents debris from entering the cooling circuits. Clean the strainer weekly during the first month.

Connection Diagram

Water Supply → Shut-off Valve → Pressure Regulator → Y-Strainer → 
Flow Meter → Machine Cooling Inlet → [Machine Cooler Circuits] → 
Machine Cooling Return → Shut-off Valve → Drain / Return to Tower

Connection Procedure

Install shut-off valves on both supply and return lines near the machine.
Connect the water supply to the machine’s cooling water inlet (labeled “WATER IN” or “COOLANT IN”).
Connect the machine’s cooling water outlet to the return / drain line.
Open supply valve and check for leaks at all connections.
Purge air from the cooling circuit — open the bleed valve (if provided) or loosen the return connection briefly.
Verify flow rate and pressure at the machine.

Hydraulic Piping (Accessory Connections)

For machines with auxiliary hydraulic circuits (cores, pneumatic-hydraulic conversion):

Identify the auxiliary hydraulic ports on the machine manifold (labeled as AUX1, AUX2, etc.).
Use hydraulic hoses rated for the machine’s maximum working pressure.
Connect hoses to the mold / core circuits.
Verify correct port identification — pressure and return ports must not be reversed.
Check that quick couplers (if used) are fully engaged.
Cycle the auxiliary circuit at low pressure and check for leaks.

Cooling Tower / Chiller Integration

If using a cooling tower or chiller:

Set the chiller outlet temperature to 20–25°C
Install a bypass valve to maintain minimum flow when the machine is idle
Use a water treatment program to prevent scale, corrosion, and biological growth
Monitor supply and return temperature with thermometers or temperature sensors

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