A system. The system includes a reuseable oil filter, a first port, a second port and a valve assembly. The reuseable oil filter has an inlet and an outlet, and includes a housing and a filter element positioned within the housing. The valve assembly is in selective fluid communication with the reuseable oil filter, the first port and the second port.

An automated computer-controlled sampling system and related methods for collecting, processing, and analyzing agricultural samples for various chemical properties such as plant available nutrients. The sampling system allows multiple samples to be processed and analyzed for different analytes or chemical properties in a simultaneous concurrent or semi-concurrent manner. Advantageously, the system can process soil samples in the as collected condition without drying or grinding. The system generally includes a sample preparation sub-system which receives soil samples collected by a probe collection sub-system and produces a slurry (i.e. mixture of soil, vegetation, and/or manure and water), and a chemical analysis sub-system which processes the prepared slurry samples for quantifying multiple analytes and/or chemical properties of the sample. The sample preparation and chemical analysis sub-systems can be used to analyze soil, vegetation, and/or manure samples. A soil collection system is disclosed which captures and directs samples to the sampling system for processing.

Disclosed is a flushing system for flushing debris from a sand trap of an irrigation system. The system includes a controlled valve fluidly coupled to a flush outlet of the sand trap. The valve is electronically controlled, such that when open and with the irrigation system running, water from the irrigation system entering the sand trap, flushes the sand trap via the valve. In one embodiment, the flush system comprises a valve connected to a flush outlet of the sand trap. A control unit in electrical communication with the valve and a sensor is associated with the control unit for sensing an operation of the irrigation system. The control unit is configured to control the valve to open or close based on input from the sensor relating to operation of the irrigation system, wherein when the valve is open fluid and/or debris can be purged from the sand trap.

A dual variable displacement pump having an actuation pump sub-system (APS) with an inlet configured to feed fuel from a fuel source into the APS, a first outlet configured for connecting the APS in fluid communication with an actuation system to supply filtered fuel for actuation. The APS has a first pump with a pump inlet in fluid communication with the fuel source, and a pump outlet connected to the third outlet of the APS. The APS further has an actuation filter between the pump outlet of the first VDP with an outlet of the APS. The fuel filter has an input, an output and a washing path. The fuel filter may be cylindrical in shape. The system further comprising a bypass valve having an input from the washing path, and a drain, wherein when the cylindrical fuel filter has a pressure drop from the input to the output, the bypass valve opens to permit cleaning of the filter by allowing fuel to flow from the washing path to the drain. The bypass valve comprises a spool, a valve seat and a spring that has a spring rate (Sk). The output may be provided through an input to the bypass valve, behind the spool.