This bypass from Parker with order number 3787424 is used on Parker double pumps mounted on an engine PTO. The bypass is operated from the cab and allows the hydraulic oil to be returned to the tank when not in use. Only a small amount of oil then passes through the system to cool it.
- An F2 twin pump fitted with a bypass valve can be utilised in applications where the pump is operating constantly i.e. when the pump is driven from the crankshaft through a cardan shaft, or when it is installed on an engine-PTO. In addition, it can be used when, temporarily, one of the two circuits is not required; the power loss is thus reduced as the non-required flow is not forced through lines and ’open center’ valves.
- The BPV bypass valve should be disengaged during transportation when the pump is operating constantly and the engine is running at max rpm; the hydraulic system is not sized for the large flow that would otherwise go through it.
- The BPV valve connects the outlet and inlet ports of the pump, and only a small oil flow goes through the system and to the reservoir.
- The valve is installed directly on top of the pump port surface with ’banjo’ fittings and two cap screws.
- As the BPV valve is symmetrical it can be ’turned 180°’ so as not to interfere with chassis components.The valve can accommodate left hand as well as right hand rotating pumps.
- The valve can only be engaged or disengaged ( through the 24 or 12 VDC solenoid) at low system pressures (below 20 bar).
