In addition to excessive altitude

In addition to excessive altitude and high pump speed , this may result in excessively high vacuum pump inlet ( insufficient pressure ) Other factors include the oil from the tank when the pressure in the pump when pushing any factors can cause pressure drop , For example:① tank or suction tube clogged oil filter .② pipe bends , fittings or flanges.③ kinked hose or rigid pipe pits .④ local suction tube wall projections .However, the suction pipe itself also has drop , so make sure it is as thick , short and straight .When the pump is positioned higher than the fuel tank when the page can be directly deducted from the available oil pressure suction height. If you can not install the pump below the liquid level in the position , you should try to keep a high level .In the host has increased year by year , while imports nineties hosts are also expected to enter the maintenance peak in the imported Hydraulic tube fittings  and pneumatic components , approximately 30% of the spare parts for the repair .As the electronics industry , information industry, the rapid development of automobile industry , pneumatic components demand will grow significantly. Among them, high-performance, energy-efficient , miniaturized mechatronic pneumatic products will be demand growth.Hydraulic , pneumatic and sealing components and systems exports in recent years, there is a certain growth, particularly due to the host product exports increase , high performance and high reliability of hydraulic and pneumatic seals with host supporting a growing amount exported growth.