Documentazione Centraline OVERLOAD SAFETY VALVES

Hydraulic Safety Valve Files SV Series Valves Characteristics Galvanized high resistance steel Body and Head. Thermal treated setting sleeve and cursor. Hardened and Anti‐ friction treated sensor sleeve. Nitrile hydraulic seal with anti‐extrusion additives. Safety trigger synchronization port. Reset spring with low recovery load. High precision surface finishing. Low friction sliding seals for high pressure. High precision repeatability and intervention. GAS threated or SAE Exhaust ports. (according to the model) Working Pressure up to 500 bar Nominal Diameter from D

Valve Size Intervention Ratio Pilot Options Discharge Connection Options Feeding Options Fixing Options Feeding via check valve (STANDARD) Intervention Electric Pilot Adjustment Plate Mounting (on demand for pre‐ existing applications) Feeding without check valve (OPTIONAL) Discharge with Discharge with Diffuser Diffuser C COMPACT INCREASED Electric Pilot Direct Connection (STANDARD) Without External Pilot (STANDARD) Wall Mounted 0 (STANDARD) 1 Coding example for a Valve with DN 32 Nominal Diameter, 1:2 pre‐charge/discharge ratio , electric pilot preparation and Compact discharge diffuser; feeding...

Hydraulic Safety Valve Files System Requirements The system is composed of one or two SV series valves, obviously all identical. This device has been designed to withhold the hydraulic pressure coming from the 5G and 5H series hydraulic power unit. The use of SV valves is, therefore, subjected to the use of a power unit just mentioned (review the technical documentation of hydraulic power units). In order to use such a system, it is necessary that the press is armed with hydraulic cushions as show in figure 1; it is also required that the maximum intervention pressure does not exceed 500 bar....

Hydraulic Safety Valve Files Characteristics Aside of the good intervention repetition, the system guarantees extremely short response timings and therefore the pressures peaks are drastically reduced. The particularly high ratio of pre‐charge to intervention pressure (up to 1:5) allows the use extremely low pre‐charge pressure inside the hydraulic cushions, and consequently, reducing induced stresses on the cushion themselves. Working Diagram All SV series valves, aside the size, follow the following working diagram: Figure 2 shows the hydraulic diagram of a SV series valve. The symbols used...

Hydraulic Safety Valve Files Connection Diagram for machines with more pressing points. Figure 3 shows the connection diagram for a couple of safety valves mounted on a press with two pressing points. This scheme works also for machines with 4 pressing points, in which case the pilot line “A” should be connected in such a way to communicate all other working valv

Hydraulic Safety Valve Files Connection Diagram from the oleo pneumatic power unit to machines with more pressing points. Figure 4 shows the connection diagram for a couple of safety valves to a 5G series oleo pneumatic power unit on a two pressing point press. Working Principle Between rods and the press ram are found the hydraulic cushions (figure 1) that are pre‐charged with a pressure P that turns the system rigid. With each working cycle of the press, the pressure inside the cushions rise to a variable value PI, that depends on the given type of work. When, accidentally, the pressure inside...

Hydraulic Safety Valve Files PRE-CHARGE TO DISCHARGE RATIO PEAK MAXIMUN PRESSURE MAXIMUM OIL VISCOSITY OIL FILTER DEGREE (FOR OPENED INTALATIONS) OIL FILTER DEGREE (INLET FOR CLOSED CISRCUIT INSTALATIONS) ROOM TEMPERATURE VALVE PRESSURE INTAKE PORT VALVE DISCHARGED PORT VALVE NOMINAL DIAMETE

Hydraulic Safety Valve Files

Hydraulic Safety Valve Files Optional Versions – Technical Data ELECTRIC PILOT TIPOLOGY (STANDARD) ELECTRIC PILOT TIPOLOGY (ON DEMAND) ELECTRIC PILOT FEEDING TENSION (STANDARD) ELECTRIC PILOT FEEDING TENSION (ON DEMAND) ELECTRO PILOT COIL RESISTAMCE

Hydraulic Safety Valve Files PRE-CHARGE TO DISCHARGE RATIO PEAK MAXIMUN PRESSURE MAXIMUM OIL VISCOSITY OIL FILTER DEGREE (FOR OPENED INTALATIONS) OIL FILTER DEGREE (INLET FOR CLOSED CISRCUIT INSTALATIONS) ROOM TEMPERATURE VALVE PRESSURE INTAKE PORT VALVE DISCHARGED PORT VALVE NOMINAL DIAM

Hydraulic Safety Valve Files

Hydraulic Safety Valve Files Optional Versions – Technical Data ELECTRIC PILOT TIPOLOGY (STANDARD) ELECTRIC PILOT TIPOLOGY (ON DEMAND) ELECTRIC PILOT FEEDING TENSION (STANDARD) ELECTRIC PILOT FEEDING TENSION (ON DEMAND) ELECTRO PILOT COIL RESIST

Hydraulic Safety Valve Files PRE-CHARGE TO DISCHARGE RATIO PEAK MAXIMUN PRESSURE MAXIMUM OIL VISCOSITY OIL FILTER DEGREE (FOR OPENED INTALATIONS) OIL FILTER DEGREE (INLET FOR CLOSED CISRCUIT INSTALATIONS) ROOM TEMPERATURE VALVE PRESSURE INTAKE PORT VALVE DISCHARGED PORT

Hydraulic Safety Valve Files

Hydraulic Safety Valve Files Optional Versions – Technical Data ELECTRIC PILOT TIPOLOGY (STANDARD) ELECTRIC PILOT TIPOLOGY (ON DEMAND) ELECTRIC PILOT FEEDING TENSION (STANDARD) ELECTRIC PILOT FEEDING TENSION (ON DEMAND) ELECTRO PILOT COIL RESISTAMCE

Hydraulic Safety Valve Files PRE-CHARGE TO DISCHARGE RATIO PEAK MAXIMUN PRESSURE MAXIMUM OIL VISCOSITY OIL FILTER DEGREE (FOR OPENED INTALATIONS) OIL FILTER DEGREE (INLET FOR CLOSED CISRCUIT INSTALATIONS) ROOM TEMPERATURE VALVE PRESSURE INTAKE PORT VALVE DISCHARGED PORT VALVE NOMINAL DIAMETER

Hydraulic Safety Valve Files

Hydraulic Safety Valve Files Optional Versions – Technical Data ELECTRIC PILOT TIPOLOGY (STANDARD) ELECTRIC PILOT TIPOLOGY (ON DEMAND) ELECTRIC PILOT FEEDING TENSION (STANDARD) ELECTRIC PILOT FEEDING TENSION (ON DEMAND) ELECTRO PILOT COIL RESISTAMCE

Hydraulic Safety Valve Files PRE-CHARGE TO DISCHARGE RATIO PEAK MAXIMUN PRESSURE MAXIMUM OIL VISCOSITY OIL FILTER DEGREE (FOR OPENED INTALATIONS) OIL FILTER DEGREE (INLET FOR CLOSED CISRCUIT INSTALATIONS) ROOM TEMPERATURE VALVE PRESSURE INTAKE PORT VALVE DISCHARGED PORT VALVE NOMINAL DIAM

Hydraulic Safety Valve Files