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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.

1 oil pump approach

Straight axis swashplate piston is divided into two kinds of pressure from the sucking oil type. Most oil pressure hydraulic pump selection have pressure tank, also with its own pump to pump up the oil cylinder oil inlet supply pressure of the oil. Since self-absorbing ability strong suction type pump, without external oil supply.

Rearward pressure hydraulic oil tank after each engine unit, it is necessary to use other hydraulic stains box arrives pressure, competence operate machinery. When the hydraulic pressure in the tank served as the lack of machinery, and hydraulic slip whip will be formed within the pull-off appearance, the formation of abnormal wear of the pump body board and return the platen. Selection charge pump supply piston pump, the use of 3000h, the operator need 1-2 times a day on the piston view to view the movement of the hydraulic pump is not working properly. Found cylinder speed drops or stuffy car, you should pump up the collapse of view, is not a view of the impeller edge scratching appearance, internal gear pump gap is not too large.

About Self-suction-type piston pump, the hydraulic oil tank must not fall below the lower limit of the oil standard, should adhere to meet the amount of hydraulic oil. The higher the cleanliness of hydraulic oil, the use of the longer life expectancy of the hydraulic pump.

2 pump bearings

The most important parts of piston bearing, if the bearing clearance presentation, you can not guarantee normal internal pump three pairs of friction pair gap, together will damage the hydrostatic bearing oil film thickness of each friction pair, down piston pump bearings use life expectancy. According to information supplied to the hydraulic pump factory, using the average life expectancy of bearings is 10000h, beyond this value will need to replace the new port.

Open bearing down, no professional view instrument is unable to view the bearing clearance, the only use visual, such as found in the outer roller scratches or discoloration, it is necessary to replace.

When replacing the bearing, should pay attention to the type of original letters and bearing, mostly piston bearing use large load bearing capacity, the best purchase of the original factory, the original specification of the goods, if the replacement of another brand, you should consult an experienced bearing The staff look-up table on the exchange, the purpose is to uphold the level of accuracy and load bearing capacity.