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Hydraulic Directional Control Valves

Ⅰ . Overview It applies to motor driven terminal type centralized lubricating system which delivers lubricating grease output from the lubricating pump to the two main grease supply pipelines alternatively. The valve comes with pressure regulating function and can reverse automatically. The set...

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image002.jpg . Overview
 It applies to motor driven terminal type  centralized lubricating system which delivers lubricating grease output from  the lubricating pump to the two main grease supply pipelines  alternatively.  The valve comes with pressure  regulating function and can reverse automatically. The set pressure for  reversal can be adjusted between 0~20Mpa and adjustment is convenient. The  structure is simple and reversal is reliable.




. Technical parameters


     Model

Pressure range (MPa)

Default pressure    (MPa)

Support system

Support pump

Annular

Spray

DR4-5

3.5~20

10.5

DRB-P;HB-P(L);DRB-L


. Dimensions

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. Working principle

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The grease chamber passage of valve is shown as  in Fig. 1. The acting force of pressure regulating spring makes piston 1 be at  the left of valve body for the act of allocating plate. The terminal of piston  1 and piston 2 is connected to grease outlet 1 and grease outlet 2  correspondingly.
Pressure grease enters the two chambers of  piston 3 from the grease inlet (Fig.2). Where, the pressure grease of left  chamber flows out from grease outlet 1. In the meanwhile, pressure grease stays  at the left part of piston 3 for the act of chamber passage in piston 1, making  piston 3 be at the right of valve body. Then the right part of piston 3 is  connected to grease returning mouth. The pressure grease in the right chamber  is plugged by piston 2. When the left pressure (outlet pressure) of piston 1  overcomes the acting force of spring on piston, piston 1 moves leftward and at  the same time piston 2 moves leftward.
When piston 1 and piston 2 moves to the right  part of valve body (Fig. 3), the left part of piston 3 is connected to grease  returning mouth. Pressure grease stays at the right part of piston 3 for the  act of chamber passage in piston 2, making piston move leftward and arrive at  the left of valve body. Then the pressure grease in the right chamber of piston  3 flows out from grease outlet 2, while the pressure grease in the left chamber  is plugged by piston 1. When the right pressure (outlet pressure) of piston 2  overcomes the acting force of spring on piston, piston 2 moves rightward and at  the same time piston 1 moves rightward.   When piston 1 and piston 2 moves to the left part of valve body, the  right part of piston 3 is connected to grease returning mouth. Pressure grease  stays at the left part of piston 3 for the act of chamber passage in piston 1,  pushing piston to move rightward and arrive at the right of valve body (Fig.  1). A working cycle is completed.
Note:  In  order to test the reversal condition of hydraulic valve, a reversal signal  sender can be installed on the valve. When the high pressure grease outlet  reverses from “outlet 1” to “outlet 2”, the piston in the valve moves, making  the contact in the signal sender close. When the piston moves reversely, the  contact is disconnected. Users may connect the signal sender to the controller  or monitoring unit based on their needs. Besides, the site operators can  observe the movement situation of indicating rod through the transparent pipe  on the signal sender 

  

 

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