Sun Hydraulics Inc, globally recognised manufacturers of Pressure Control Valve which exceed the expectations of Original Equipment Manufacturers and designers worldwide. Unsurpassed quality, high performance and durability at competitive prices. Pressure Control Valves are used to limit System maximum pressure (Relief Valves), reduce part of a system pressure (Reducing Valves) or control sequential opening of flow and pressure to secondary and subsequent parts of a system (Sequence Valves). Comprehensive datasheets and specifications available. Corridor Connections have a significant range of stock in Melbourne, Victoria, Australia. Pressure Control Valves can be Direct Acting or Pilot Operated. Direct Acting valves are best suited to circuits which can tolerate a greater pressure rise as the flow increases but are fast acting and good at pressure spike elimination. Pilot Operated valves have a low pressure rise but take longer to open which can result is pressure peaks (spikes) that exceed the specification of other components or cause harsh shocks and hammering in the circuit. Pressure Control Valves are available in cartridges with flow rates from a few litres per minute to 800 litres per minute in a single cartridge.
Cartridge Valves offer advantages to designers and owners of machines. A cartridge can be installed in a custom manifold with other valves to form a compact arrangement to control different functions of a machine. Cartridges can be installed in such a way as to eliminate multiple connections such as hoses and fittings all of which are liable to become loose and leak, they are expensive and bulky: valves can be sized to meet the exact requirements of that part of a circuit, a large Relief Valve, smaller Pressure Reducing Valve, Sequence Valves as required. Maintenance is a matter of testing, determining the failed item and removing that cartridge without interfering with hose and fittings- quick and as clean as possible. A cartridge valve is a self contained valve with no loose parts, it is simple to remove defective parts and replace them with basic tools. Line bodies are available to allow one or a couple of cartridge valves to be installed. Common port options in Australia are BSPP or UNO, these are parallel threads where the sealing is done by elastomeric seals and the cartridges are retained by threads- the taper thread forms are not recommended for aluminium bodies, premature cracking is likely.
Pressure Relief Valves are intended to connect the High Pressure Circuit to the Tank Return Circuit, they are closed up to the Set Pressure- they are not intended to relieve to a secondary circuit. Pressure Reducing Valves are open up to the Set Pressure and close to prevent the downstream circuit exceeding the Set Pressure- Reducing Relieving Valves will connect the regulated circuit to Tank if the Set Pressure is induced to increase above the Set Pressure. A sequence Valve is closed to the Set Pressure and opens to the secondary or subsequent circuit, a Sequence valve can be used to control a machine say “clamp before drill advance, drill retract before unclamp.