Explanation
The system is designed so that the water pressure used to fill the system pushes the oil out the top of the separator and no pump is required. The pressure needed to push the oil out will vary from 15 psig to XX depending on the where the oil has to go. The oil is discharged only during the separator fill mode. During normal operation a positive seal is required on the oil discharge line so that the oil or air cannot come back into the system or reduce the system vacuum. If the system is pulling the oily water from a sump that has a negative suction head then a check valve can be used to provide the seal. A Y-strainer is used to make sure nothing can plug up the check valve. If the system has a positive suction head then the check valve will allow oil to escape inappropriately. Therefore, if the system has a positive suction head a check valve cannot be used. The check valve is the default for all the economy models plus the 2 and 5 gpm systems.
The most reliable system is to use a motorized ball valve on the oil discharge line. This is a no-fail system and provides the highest degree of reliability for the oil discharge. This is the default for the 10, 25 and 45 systems (other than the economy versions)
If the discharge head is greater than the inlet fill water pressure an oil pump will be required to discharge the oil from the separator. The default pump is a gear pump.
Default
A Y-strainer and check valve is the default for the 2 and 5 gpm models and all the economy models. Optional for all other models that have a negative suction head.)
A motorized valve is the default for the 10, 25 and 45 models. Optional for all other models and required for any system that has a positive suction head) The four options available for oil discharge are.
1- A Y-strainer and check valve. (Only works with a negative suction head)
2- A motorized valve. (Default for the 10, 25 and 45 models. Optional for all other models and required for any system that has a positive suction head)
3- A pressurized oil pump (separate and loose for customer installation).
4- An integrated pressurized oil pump (mounted on system).