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(5) check out the situation with the deputy of the oil valve. Use your fingers to block the oil valve under the hole, with the other fingers to gently press down the valve when the valve finger from the upper end of time, it can automatically spring back into place, it indicated that the valve secondary seal is good, otherwise should replace the oil valve deputy.

(6) Check quite cylinder. Standard fuel pump body and the very cylinder gap between the 0 ~ 0.03mm, such as more than 0.2mm, it should replace the parts.

Gap (7) Check the plunger flange and the control sleeve between the grooves, should be 0.02 ~ 0.08mm, such as more than 0.12mm, you must replace the control units.

Electric pumps are providing pressurized fluid to the hydraulic drive a hydraulic components, is a type of pump. Electric hydraulic pump function is to power machine (such as an internal combustion engine and electric motor, etc.) of the mechanical energy is converted to pressure energy of the liquid. Output flow can be adjusted according to need is called a variable pump, flow can not be adjusted is called a metering pump. Electric hydraulic pump system often used gear pumps, piston pumps and pump three blades. Gear pumps: smaller, simpler structure, for the cleanliness of the oil is not critical, cheaper; however unbalanced shaft by force, badly worn, leaking large. Vane pumps: vane pump into a double-acting and single acting pumps. The pump flow evenly, smooth operation, low noise, operating pressure and volumetric efficiency is higher than a gear pump, the structure is more complex than the gear pump.

Use hydraulic tank

The important role of the hydraulic oil tank in the hydraulic system for the separation of oil, heat the oil contained in the air and eliminate foam. Choose to use the tank first thing to consider its capacity, general mobile equipment take 2 to 3 times the maximum pump flow rate, fixed equipment to take 3 to 4 times; Second, consider the oil tank when the system is all hydraulic oil tank may not extend below the minimum oil level when the oil level after retracting the cylinder must not exceed the maximum oil level; and finally consider the tank structure, the traditional fuel tank separator and precipitated dirt can not play the role of a vertical bulkhead should be installed along the longitudinal axis of the tank . Leave gaps between the separator tank at one end and the end plate on both sides of the separator space communication, the hydraulic pump oil inlet disposed at one end on both sides of the separator is not connected, so that the oil into the oil and return the distance between the farthest, hydraulic tank up some more cooling effect.

Market research industry developments

Piston pump is the pump in one, but the whole pump industry is a typical investment-driven industries, the market demand is subjected to national macroeconomic policies, which is subject to macroeconomic policy Teyou water, construction, energy and other sectors of greater impact. Hydraulic piston pump is a piston pump, the hydraulic industry's annual output value has not reached 10 billion yuan business, even more than 500 million yuan of annual output value of only a handful of companies, with total annual sales of the entire industry not as a of total sales. When supporting industries do not have the ability to compete with foreign companies, import goods on the domestic market will be strong artificial means of control and nothing to take into account. Most of the profits of construction machinery spare parts have been removed to the fact that not only allow the host manufacturer painful and helpless. Based on this situation, OEMs as well as funds from other industries are constantly entering the hydraulic industry. Just over one billion yuan investment into the hydraulic industry. But this trend is no doubt to increase the intensity of competition within the industry, changing the original industrial structure and order. Piston displacement is a typical hydraulic machinery, driven by a prime mover, the input of mechanical energy is converted into fluid pressure energy, and then entered as pressure, flow into the system, it is the power source of the hydraulic system, because it can transport liquid under high pressure, so the industrial production and daily life in various industries have been widely used.

Market conditions

Piston pumps and other pumps in shipbuilding, oil exploration, truck cranes and other widely used. 2008 ship production reached 15,000 tons, accounting for 21% of the number dwt world market, 2015 will become the world's largest shipbuilding country. To ensure the normal navigation or mooring boat, crew and passengers to meet the daily needs of each boat must be equipped with a certain amount of, can play a relevant role in marine mining, marine pump is one of the important auxiliary equipment. According to incomplete statistics, in various ship auxiliary machinery and equipment, and the total number of all types of marine pumps for different purposes, accounting for about 20% -30% of the total amount of machinery and equipment of ships, marine pump prices in the marine equipment costs the proportion is relatively large. Of the total cost, the marine pump about 4% to 8% of the total cost of the ship equipment, under normal circumstances. Marine pump purchase a medium-sized vessels of up to 10 million yuan or more.