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Sixth, the pump should stop the job first return valve gradually loosened until the gauge gradually return to zero, before breaking jack tubing connector nut. Removable tubing or pressure gauges and other prohibited when the load.

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Seven, cooperation dual effect of oil pump jack in order to use the two together duplex oil pump is appropriate.

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Eight, oil resistant rubber tube high voltage necessary work shall not exceed the maximum hydraulic pressure of the hydraulic pump extra or actual job. Tubing length less than 2.5m. When a femoral artery and two pump jack, tubing standard should work together.

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Precautions

Removable tubing or pressure gauge prohibition load

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When the job, under the injection pump camshaft cam and the plunger stretched spring effect, forcing the plunger for the upper and lower reciprocating motion, and then complete the mission oil pump, oil pump process can be divided into the following three periods.

Into the oil process

When the cam bumps turn over some, in effect stretched spring force, the piston moves downward, the plunger upper space (called pumping chamber) occurred vacuum, when the end face of the plunger on the piston sleeve into the hole open, the full oil passage in the upper body pump diesel into the pumping chamber through the hole, the plunger is moved to the lower dead point, into the oil is completed.

Fueling process

When the camshaft to the cam roller raised some jacking body, the plunger spring is stretched tight, the upward movement of the plunger, the fuel pressure, a through hole flow back into the fuel injection pump some oil chamber upper body. When the plunger cover the top hole of the upper edge of the sleeve to travel, because the plunger and the sleeve with a small space (0.0015-0.0025mm) pump oil chamber of the plunger at the top of the oil into a sealed chamber, column Cypriots continued to rise, active hydraulic pump oil chamber increased, pumping pressure> outlet valve spring force + high pressure hose stretched remaining pressure, open the valve, high pressure diesel fuel through a valve into the high pressure tubing, after injection It is injected into the combustion chamber.

Back to oil process

Plunger up oil, when the uplink to the chute (stop for the edge) on the plunger back hole on the sleeve and connected, low pressure oil pump oil chamber and then the head of the plunger hole and radial holes and chutes exchange, hydraulic suddenly reduced, the oil valve in the stretched spring force effect active closed, continuous supply. Thereafter the plunger but also upstream, when the cam bumps turn over some, under the effect of stretched spring plunger and down. At this time began the next cycle.

Conclusion: After the above discussion, reached the following conclusion

① total stroke reciprocating plunger L is constant, the resolution by the cam lift.

② plunger fuel supply amount per cycle depends on the size of the fuel supply stroke, stroke oil from the camshaft control is variable.

③ oil supply start time does not vary with changes and itinerary changes.

④ roll plunger may change oil end time, and then change the amount of oil.

3. Domestic Series Injection Pump

Domestic Series Piston mainly A, B, P, Z and Ⅰ, Ⅱ, Ⅲ number series. Series is based on a single-cylinder diesel power plans to plead not the same amount of oil to the piston