Prefill - exhaust valve (FPV/PVF/PVT)
Pre-fill Valves are check valves with hydraulic (pilot) release function. They are also referred to as exhaust valves and are generally installed between a cylinder and oil reservoir in hydraulic press and/ or injection moulding machine where high speed operation is required. The use of these valves enable the manufacturer to use a smaller capacity pump and motor and achieve the expected cycle time of the equipment.
During high speed forward stroke of cylinder, the pre-fill valves suck a large amount of oil from the reservoir needed to fill the cylinder and the main pump-motor, now, sized optimally, are used to achieve the required pressure. During pressurisation, the valve closes completely and prevents reverse oil flow.
For the return stroke, the valve is opened by supplying a pilot pressure that opens the path back to the reservoir and retract the cylinder. The decompression feature is built-in to the valve to enables controlled pressure release upto sizes NG 200.
Key Features:
- Available as sandwich (FPV), tank (PVT) and flange (PVF) mount designs
- PVT and PVF versions are 1:1 replaceable with equivalent makes
- High flow handling capacity with low pressure drop
- Zero leak design
- Decompression feature standard up to size NG 200
- Available up to NG 400 size and customisations options
