Coating and bonding strength with basic cleanliness and roughness of the substrate. Before spraying, the basic surface cleaning, degreasing and surface roughening pretreatment coating process is an important step. Part of the first response spray degreasing treatment with gasoline, acetone, Tongchuan hydraulic, with a file and fine sandpaper, Whetstone will fatigue layer and the oxide layer is removed to expose the metal color. According to this principle, hydraulic mechanic, it is contemplated that while online (also known as hot) to measure or adjust the safety valve, hydraulic repair, if provided an additional upward force from the outside, when the sum of the additional force just this media pressure against the spring When the preload, the valve will also open, even in the absence of the role of offline media under (also known as cold) conditions, alone by an external additional force to overcome the spring preload, the valve can also be opening action, Figure 1 clearly It represents the balance of this force. Xi'an-Tongchuan hydraulic _ _ hydraulic maintenance through hydraulic repair shop provided by the Xi'an Chengtong hydraulic maintenance Limited. Xi'an-Tongchuan hydraulic _ _ hydraulic maintenance through hydraulic repair shop is Xi'an-hydraulic-repair Ltd. (www.xayeya.com) (www.xayeya.com) this year introduced a new upgrade, the above picture is for reference only, please dial this Tel pages or pictures on obtain the latest information, contact: the money work.