TAILIEUCHUNG - Mechanical Engineers Handbook Episode 11

Tham khảo tài liệu 'mechanical engineers handbook episode 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 2. Hydraulics 589 top and bottom of spool 1. The force of spring 2 and the difference in area between the top side and the bottom side of spool 1 will quickly move the spool 1 down and close the outlet port. Figure shows another version of the compound-type relief valve. This valve is referred to as a balanced-piston-type relief valve. The operating functions in Fig. are basically the same as those in Fig. . The main difference is in the method of flow. From the pilot valve 2 oil is returned to the reservoir. The pilot drain D is a hole or orifice passing through the main spool 1 directly into the outlet port. This feature requires fewer hydraulic lines but it also allows outlet back pressure to adversely affect pilot operations. It is important that the outlet lines be unrestricted to ensure Figure Version of the compound-type relief valve. a Valve shown closed. b Compound relief valve with remote venting valve in use. Valve shown open or vented. Fluid Dynamics 590 Fluid Dynamics minimum back pressure. Orifice B in Fig. is placed differently as is the pilot valve. The port V in Fig. offers a new method of control for the compound-type unit. If port V is allowed to be open to the atmosphere or by a simple valve to the reservoir the pressure on the top side of the main spool 1 will be relieved and the spool will immediately move upward and open. This practice is called venting and offers an auxiliary or additional method of instantly relieving the system pressure without altering or affecting the unvented operating setting of the valve. A simple direct-operating relief valve manually operated will handle venting functions and further increase the flexibility of this unit s operation. Figure shows a typical arrangement that allows manually controlled venting and or automatic system pressure operation. The vent valve is small since it is required to handle minor volumes. COMPOUND-TYPE SEQUENCE VALVES Figures and .

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