????Priority flow control
????Regardless of pump speed, pressure or flow operations branch needs size, value a flow control valve ensures total equipment required for the job flow. In this circuit
shown in Figure 7, the pump output flow is necessary once the oil is greater than or equal to the required flow, the secondary flow can make it with or back to the tank. SETTINGS primary
flow valve (proportional valve) to control the pump once combined, eliminating the need for external piping and to eliminate the leak, it decreased costs. A typical use of such gear pump
circuit is steering the organization often can be seen on the truck crane, which eliminates the need for a pump.
????Load-sensing flow control valve function and a flow control setpoint function very near: that regardless of the speed of the pump, operating pressure or pumping
required bypass flow size, are supplied to the primary traffic. But plans shown only once after a port to supply the required flow passage until its maximum adjustment value. This loop can
be replaced by a standardized flow control circuit and to achieve maximum output flow. In the absence of load circuit pressure is lower than a given value traffic control plan, so the low
temperature loop, a small no-load power consumption. Load-sensing flow control valve than the column with the same primary flow control valve, which is typically used in power steering
organization.
????Bypass flow control
????About bypass flow control, regardless of the speed bump or job pressure pump, pump the maximum total by reservation for the fluid to the system, the remaining import
some drain back tank or pump. This plan constrains the flow system, it has the best function. The advantage is that, after planning to control the maximum adjustment loop flow, reduce
costs; the pump and valve in one, and through the pump bypass control, so that the circuit pressure to a minimum, to cut the pipe from the surface and leak.
????Bypass flow control valve can be used with restraint job flow (operating speed) planning the mission type load sensing control valve design together. Such type of gear
pump circuits, commonly used in hydraulic constraints operate to achieve the best speed of the engine waste trucks or power steering pump circuit, it can also be used stationary
machinery.
????Dry suction valve
????Dry suction gas control valve is a hydraulic valve Zan, which is used to pump oil into savings, when the hydraulic equipment load, only the minimum flow through the
pump; in the load, the full flow suction pump. As shown in Figure 10, this circuit can be omitted clutch between the pump and prime mover, then dropped the cost, no-load power consumption
is also reduced, because the minimum flow loop through the insistence of the prime mover of power equipment. In addition, also declined pump noise at no-load. Dry suction valve circuit can
be used in any vehicle driven by the engine's hydraulic system switch, such as waste loading trucks and industrial equipment.
????Pump selection program
????Currently, work pressure has come near the gear pump piston pump, a combination of the gear pump load sensing program provides a possibility variables, which means
between the gear pump and piston pump understand the original boundaries become increasingly blurred a. One of the determinants of reasonable pump selection program, is the capital of the
entire system, compared with the price of expensive piston pump, gear pumps for its low cost, simple circuit, low demand characteristics of the filter into many occasions practicable The
selection plan.
The primary construction machinery hydraulic power system depends on the volume of the pump power, when the volume drops to 72% when the power on the need for routine
repair, replacement bearings and seals of aging, to replace or amend the friction pair gap beyond cooperation to make Its function rehabilitation.
This article straight axis swashplate piston pump based, describes its use and repair approach.